Table of Contents
Overview
Definition and Importance
Cell signaling is a fundamental aspect of biological life, enabling cells to perceive and respond to their extracellular environment. This process is crucial for various cellular functions, including development, growth, and immunity. Errors in cell signaling can lead to significant biological consequences, highlighting its importance in maintaining cellular homeostasis and overall organismal health.[1.1] The process of cell signaling begins with reception, where a target cell detects a signal, typically in the form of a small, water-soluble molecule. This detection occurs through the binding of the signal molecule to a specific receptor protein located on the cell surface or, in some cases, to intracellular receptors. The binding initiates a series of events known as signal transduction, which can involve a single step or a complex cascade of changes among various molecules.[2.1] Upon binding, the receptor undergoes a conformational change that activates it, leading to the generation of a response within the cell. For instance, in G-protein-coupled receptor (GPCR) pathways, the activation of the receptor allows it to trigger a cascade of downstream signaling events, amplifying the initial signal and facilitating a robust cellular response.[3.1]Mechanisms of Cell Signaling
Cell signaling mechanisms are essential for initiating and regulating immune responses, particularly in distinguishing between pathogenic and non-pathogenic stimuli. Immune sentinel cells play a pivotal role by producing highly specific responses to pathogens and tissue injury, influenced by various regulatory factors and biochemical pathways. These pathways enable combinatorial and temporal coding of information, crucial for tailoring immune responses to specific threats.[4.1] Pathogen recognition is facilitated by different families of pattern recognition receptors (PRRs), which activate complex signaling pathways responsible for eliciting inflammatory and antimicrobial responses upon detecting pathogen-associated molecular patterns.[6.1] The innate immune system's receptors, evolved to recognize conserved structures across large groups of pathogens, differ fundamentally from those of the adaptive immune system. This distinction highlights the innate system's ability to respond rapidly and effectively to a wide array of pathogens.[8.1] Inflammation-mediated immune cell alterations are associated with various diseases, including asthma, cancer, and autoimmune disorders. Inflammatory cytokines, such as IL-6, are primary mediators of these responses, acting through specific signaling pathways like the MAPK pathway to recruit immune cells to sites of injury.[7.1] The activation of these pathways is critical for orchestrating the immune response and ensuring effective infection combat and tissue repair. Understanding cell signaling mechanisms in immune responses is crucial for recognizing how immune sentinel cells initiate responses to pathogens and tissue injury. These cells produce stimulus-specific responses informed by regulatory factors and biochemical pathways that define signaling circuits. Such circuits enable tailored responses to various stimuli.[4.1] Upon pathogenic infection, the innate immune system responds to pathogen-associated molecular patterns, activating immediate host inflammatory and antimicrobial responses.[6.1] Insights from these mechanisms can inform the development of targeted therapies in immunology, enhancing treatment precision for various diseases.[5.1]History
Major Discoveries in Cell Signaling
The history of cell signaling is marked by several significant discoveries that have shaped our understanding of cellular communication. The concept of cellular signaling can be traced back to 1855 when Claude Bernard first described the effects of 'internal secretions' from ductless glands on distant cells, laying the groundwork for future explorations into how cells communicate and respond to their environment.[42.1] In the 1970s, the term 'signal transduction' emerged in biological literature, with Martin Rodbell's 1980 hypothesis positing that individual cells function as cybernetic systems composed of three molecular components: discriminators, transducers, and amplifiers. This framework highlighted the role of cell receptors as discriminators that receive external signals and process this information across the cell membrane.[43.1] Over the past century, cell signaling has evolved into a fundamental mechanism governing most physiological processes across various biological systems. Initially, many principles of cell signaling were derived from hormonal studies, but the field has since expanded significantly, benefiting from interdisciplinary contributions that have enriched our understanding.[44.1] In multicellular organisms, diverse modes of intercellular communication have developed, enabling cells to coordinate their functions effectively. This includes both direct physical contacts between adjacent cells, which contribute to tissue formation, and more intricate signaling pathways that drive cellular activation states.[45.1] Claude Bernard was a prominent French physiologist known for his pioneering discoveries that significantly advanced our understanding of various physiological processes. His research focused on the role of the pancreas in digestion, the glycogenic function of the liver, and the regulation of blood supply by the vasomotor nerves, which collectively laid the groundwork for modern biology and introduced the concept of homeostasis.[53.1] Bernard's contributions have had a lasting impact on clinical bioregulatory medicine, influencing many principles that are still relevant today.[52.1] His innovative methodologies and profound insights into these physiological processes have shaped our understanding of the mechanisms involved in cell signaling.[53.1] These major discoveries collectively illustrate the evolution of cell signaling from early observations to a complex field that integrates various scientific disciplines, ultimately enhancing our comprehension of cellular dynamics and their implications for health and disease.Evolution of Cell Signaling Research
The evolution of cell signaling research has significantly contributed to our understanding of the complexity of multicellular organisms. Intercellular communication is a fundamental biological activity that has been essential for the survival of even the most primitive multicellular animals. This capacity for cells to receive and respond to signals has its origins in the exchange of information among unicellular organisms, which occurred via the extracellular milieu.[76.1] As multicellular organisms evolved, they developed various modes of intercellular communication to regulate their coordinated functions. These adaptations have been influenced by environmental pressures, leading to the formation of tissues and barrier structures through direct physical contacts between adjacent cells, as well as changes in cellular signaling pathways at the microscopic level.[77.1] The mechanisms of cell signaling have undergone significant transformations over the last century. Initially, the principles of cell signaling were primarily derived from hormonal studies. However, the field has expanded exponentially, benefiting from interdisciplinary inputs from physics, chemistry, mathematics, statistics, and computational fields.[62.1] This interdisciplinary approach has facilitated the integration of multiple omics data sets and the application of network analysis methods, which have been instrumental in identifying key molecular players and pathways within cellular networks.[48.1] Moreover, the evolution of cell signaling mechanisms has been characterized by three distinct phases: origination through disparate cell-cell attachment modalities, integration via lineage-specific physiological mechanisms, and autonomization through natural selection. These phases have been achieved differently across various lineages, highlighting the diverse evolutionary paths of multicellular organisms.[61.1] The complexity of these signaling pathways is further illustrated by the development of specific pathways, such as the Wnt pathways, which play critical roles in cellular communication and function.[60.1] Recent advancements in computational biology have also transformed our ability to model and predict cell signaling pathways. Techniques derived from "whole-cell" models of bacteria are now being applied to create comprehensive models of human cell signaling, providing a holistic view of cell function.[50.1] These models have been utilized to study dynamic signal transduction at the single-cell level, enabling researchers to observe cellular responses and manipulate biological systems more effectively.[47.1] As a result, the integration of computational modeling into cell signaling research continues to enhance our understanding of the underlying biological processes and their implications for health and disease.Types Of Cell Signaling
Autocrine Signaling
Autocrine signaling is a form of cell signaling in which a cell secretes signaling molecules that bind to receptors on its own surface, allowing the cell to regulate its own function autonomously. This mechanism is crucial for maintaining cellular homeostasis and overall tissue function, as it enables cells to fine-tune their responses to various stimuli.[102.1] In the context of the immune system, autocrine signaling plays a significant role in T cell activation and proliferation. For instance, T cells release ATP upon T cell receptor (TCR) cross-linking, which then binds to purinergic receptors on the same cells, triggering their activation in both autocrine and paracrine manners.[87.1] Specifically, P2X7 receptors are instrumental in mediating calcium influx and subsequent signaling events that are essential for T cell activation.[86.1] Furthermore, the autocrine signaling of interleukin-2 (IL-2) is vital for the development and functional activity of various T cell subsets, including regulatory, effector, and memory T cells.[89.1] Research has demonstrated that CD8 T cells utilize IL-2 in an autocrine manner to enhance their secondary expansion potential, which is critical for memory cell programming.[88.1] The interaction between IL-2 and its receptor also induces the expression of high-affinity IL-2 receptors, further promoting cellular proliferation.[90.1] This autocrine pathway is particularly relevant for therapeutic strategies aimed at modulating immune responses in conditions such as autoimmunity and cancer.[89.1] Autocrine signaling plays a vital role in various physiological processes, including immune response, development, and tissue repair.[92.1] This type of signaling allows cells to respond to their own secreted signals, which can lead to significant transcriptional changes in cells that express the corresponding receptors. Notably, cytokines are key players in this process, as they can stimulate these changes in an autocrine, paracrine, and endocrine manner.[105.1] The interplay between autocrine and paracrine signaling is particularly important in the immune system, where crosstalk between these signaling mechanisms enables immune cells to adapt their responses to extracellular cues generated by surrounding cells in different tissues.[104.1] Understanding these mechanisms is crucial for gaining insights into cellular behavior and developing therapeutic strategies for diseases such as cancer.[92.1]Paracrine Signaling
Paracrine signaling is a form of cell communication that involves the release of signaling molecules by a cell, which then act on nearby target cells within the same tissue. This type of signaling is essential for coordinating activities among different cell types in a localized environment, enabling them to function in a synchronized manner.[95.1] Paracrine signaling and autocrine signaling are distinguished primarily by their target cells and the distance over which the signaling molecules act. Autocrine signaling involves factors that act on the same cell type that releases them, resulting in a response within the releasing cell itself.[94.1] In contrast, paracrine signaling affects nearby cells within the same tissue, facilitating communication between different types of cells in a local environment.[95.1] This mechanism is essential for coordinating activities among neighboring cells, allowing them to function together in a synchronized manner.[95.1] Paracrine signaling is a crucial mechanism for coordinating activities between different types of cells within a local environment, allowing them to work together in a coordinated manner. This form of signaling specifically affects nearby cells within the same tissue, distinguishing it from autocrine signaling, which targets the same cell that released the signaling molecules.[95.1] Understanding paracrine signaling is fundamental to exploring the diverse mechanisms of cell signaling and their roles in cellular communication and function.[83.1] Cell signaling is essential for orchestrating a myriad of biological functions vital for life, highlighting the importance of effective communication between cells in various physiological processes.[83.1]Recent Advancements
Interdisciplinary Approaches in Cell Signaling Research
Recent advancements in cell signaling research have increasingly highlighted the importance of interdisciplinary approaches, particularly in understanding complex biological processes such as immune responses and cancer development. One significant area of focus is the interplay between different forms of cell signaling, including autocrine, paracrine, and endocrine signaling. These mechanisms are crucial for maintaining homeostasis and coordinating cellular responses to environmental cues.[122.1] Interdisciplinary approaches in cell signaling research have highlighted the significance of various signaling mechanisms, particularly autocrine and paracrine signaling, in regulating physiological processes. Autocrine signaling is defined as a cell receiving a signal that it has secreted itself, playing a crucial role in immune responses, development, and tissue repair.[115.1] For example, T cells utilize autocrine signaling to proliferate in response to antigens, thereby amplifying the immune response.[109.1] This self-targeting mechanism is complemented by paracrine signaling, which involves a cell producing signals that induce changes in nearby cells, facilitating coordinated responses during immune challenges.[113.1] Research has shown that macrophages exploit ATP release as a paracrine communication mechanism to propagate calcium signals to neighboring cells, which is essential for sustaining macrophage phagocytosis.[114.1] Together, these signaling pathways underscore the complexity of cellular communication and their collective impact on immune function. Interdisciplinary approaches in cell signaling research highlight the importance of various signaling mechanisms, including autocrine, paracrine, and endocrine signaling, which play crucial roles in maintaining homeostasis, regulating development, and responding to external cues in multicellular organisms.[122.1] Endocrine signaling, characterized by the release of hormones into the bloodstream, operates at a slower pace compared to autocrine and paracrine signaling, as it relies on blood flow to reach distant target cells.[123.1] This slower mechanism is essential for regulating long-term physiological processes. Autocrine signaling, where a cell responds to signals it secretes itself, is particularly relevant in the context of cancer, as it can lead to clonal proliferation and contribute to drug resistance.[116.1] Recent advancements in understanding specific cell signaling pathways have influenced the development of targeted therapies aimed at modulating these pathways, particularly those associated with the immune response against cancer cells.[121.1] By identifying immune genes involved in signaling, researchers can create drugs that enhance the immune system's ability to recognize and eliminate cancer cells or inhibit pathways that contribute to tumor growth. Recent advancements in cell signaling research have also led to the development of targeted therapies that modulate specific signaling pathways associated with immune responses against cancer cells. By identifying immune genes involved in these pathways, researchers can create drugs that enhance the immune system's ability to recognize and eliminate cancer cells or inhibit pathways that contribute to tumor growth.[121.1] This interdisciplinary approach, combining insights from molecular biology, immunology, and pharmacology, underscores the complexity of cell signaling and its implications for therapeutic strategies in complex diseases.Applications Of Cell Signaling
Role in Immune Responses
Cell signaling plays a crucial role in the immune response by enabling immune cells to differentiate between self and non-self antigens. Innate immune cells utilize various signaling pathways to recognize broad groups of pathogens, such as bacteria and viruses, through conserved components within each group. For instance, the recognition of heat shock proteins like Hsp70 and Hsp90 has been implicated in autoimmune and chronic inflammatory diseases, including rheumatoid arthritis, highlighting the importance of these signaling pathways in immune reactivity.[158.1] One of the key mechanisms of cell signaling in the immune system involves Toll-like receptors (TLRs). Activation of TLRs at the cell surface induces the expression of NF-κB-dependent cytokines, while endosomal TLRs trigger both cytokine production and type I interferon responses. However, some innate immune signaling pathways remain poorly understood, particularly regarding the specifics of signal transduction and the regulation of these signals.[159.1] T and B lymphocytes, which are central to the adaptive immune response, communicate with their environment through cell-surface receptors that bind to antigens. The binding of antigens to these receptors generates intracellular signals that are critical for the immune response.[160.1] For example, the activation of protein kinase C leads to the activation of the MAP kinase pathway, which is essential for transcription factor phosphorylation, changes in gene expression, and stimulation of cell proliferation. This cascade is vital for the proliferation of immune cells in response to growth factors.[161.1] Moreover, the differentiation of immune cells is influenced by autocrine signaling. During an adaptive immune response, various cytokines are produced by immune cells, mediating multiple processes. For example, interleukin-4 (IL-4) has been shown to correlate with interleukin-2 (IL-2) induced lymphocyte proliferation, illustrating how autocrine signaling enhances the immune response during pathogen invasion.[168.1] Naive T-helper (Th) cells utilize IL-4 and interferon-γ for autocrine signaling, which is crucial for their differentiation into Th1 or Th2 cell states, further emphasizing the role of autocrine mechanisms in shaping immune responses.[169.1]Implications in Cancer Therapy
Cell signaling pathways play a crucial role in the development and progression of cancer, with dysregulation of these pathways often leading to tumorigenesis. Key signaling pathways, such as the mitogen-activated protein kinase (MAPK) pathway, Phosphatidylinositol-3-kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) signaling, and Wnt/β-catenin signaling, have been identified as significant contributors to cancer biology and are considered promising therapeutic targets.[164.1] These pathways are involved in essential biological processes, including cell proliferation, apoptosis, and metabolism, which are frequently altered in cancer cells.[163.1] The therapeutic targeting of these dysregulated signaling pathways has revolutionized cancer treatment, providing more precise and effective options for patients. For instance, the aberrant activation of the PI3K/AKT/mTOR pathway is associated with increased tumor mass and enhanced cell survival, making it a focal point for targeted therapies.[181.1] By inhibiting these pathways, researchers aim to reduce tumor growth and improve patient outcomes. Moreover, chronic inflammation, which is often linked to cancer progression, can also be modulated through the targeting of specific signaling pathways. Pathways such as nuclear factor kappa B (NF-kB) and Janus kinase/signal transducers and activators of transcription (JAK-STAT) are pivotal in regulating inflammatory responses that can either promote or inhibit tumor development.[165.1] Understanding the crosstalk between inflammation and tumor signaling pathways is essential for developing innovative therapeutic strategies that harness the immune response against tumors.[165.1] Recent advancements in precision medicine have further enhanced the ability to tailor cancer therapies based on the molecular alterations present in individual tumors. This approach utilizes knowledge of specific signaling pathways to inform treatment decisions, thereby improving the efficacy of targeted therapies.[166.1] However, challenges remain in overcoming resistance to these therapies, necessitating ongoing research to unravel the complexities of signaling networks in cancer.[166.1]In this section:
Challenges And Future Directions
Issues in Signaling Pathways
Understanding the intricacies of cell signaling pathways is crucial for advancing both basic research and clinical applications. The inherent complexity of these pathways poses significant challenges in deciphering their operational mechanisms, which are vital for addressing various pathologies.[187.1] Aberrant signaling is implicated in numerous diseases, necessitating context-specific studies to meet the technical demands of current methodologies.[188.1] Recent technological advancements have enabled the observation and modeling of signaling pathways at the single-cell level, providing insights into the dynamic nature of signal transduction.[189.1] However, to fully leverage these technologies, further innovations are needed in cell observation, modeling, and manipulation techniques.[189.1] The integration of non-coding RNAs (ncRNAs), such as microRNAs and long non-coding RNAs, into existing signaling frameworks presents additional challenges. Although their roles in cellular signaling and gene regulation are increasingly recognized, comprehensive studies exploring their interactions within signaling pathways remain limited.[191.1] This highlights the need for research focused on elucidating the interactions between ncRNAs and gene regulation.[191.1] In cancer therapy, the delivery of short ncRNAs is hindered by issues like poor cell penetration and immune activation, complicating their clinical application.[192.1] Overcoming these challenges is essential for developing effective ncRNA therapies that do not disrupt normal cellular functions.[193.1] Cellular signaling systems are complex due to the interconnections between various pathways, with shared components receiving inputs from multiple sources, leading to intricate cellular responses.[195.1] For example, the Lunatic Fringe protein in mammalian cells influences interactions between the Notch1 receptor and the Dll1 ligand, demonstrating how specific components affect signaling dynamics.[194.1] Understanding these interactions is crucial for developing new diagnostic tools and therapies, enabling the creation of drugs that target specific pathways more precisely.[196.1] Dedicated experimental and theoretical approaches are necessary to decipher these complex systems, as shown by studies on the Bone Morphogenetic Protein (BMP) pathway.[197.1] Emerging technologies, particularly CRISPR-based tools, are transforming cell signaling pathway research. Since its discovery, CRISPR-Cas9 has been pivotal in drug discovery, allowing systematic testing of genetic alterations' effects on cellular mechanisms.[200.1] In oncology, CRISPR tools like Cas9, Cas12, and Cas13 have enhanced understanding of tumor evolution and therapeutic target identification.[201.1] Clinical trials using CRISPR-Cas9 in refractory cancer patients, especially in T cell therapies, highlight the potential of these technologies to develop targeted therapies.[202.1] However, integrating these innovations into existing therapeutic frameworks remains a critical area for future exploration.Potential for Therapeutic Interventions
The potential for therapeutic interventions in cell signaling is increasingly recognized, particularly in the context of cancer treatment and personalized medicine. The advent of live single-cell imaging has significantly enhanced the ability to collect data on signaling network activity, allowing researchers to study the dynamics of information transfer in living cells at high sampling rates. This advancement has led to a rapid increase in the number of measurable signaling elements and the duration over which these dynamics can be analyzed, thereby opening new avenues for therapeutic strategies.[182.1] One promising area of research involves non-coding RNAs (ncRNAs), which have emerged as key regulators in cancer-related pathways. Their integral role in cancer development and progression positions them as potential therapeutic targets. Current studies suggest that ncRNAs could serve as therapeutic adjuvants and components of tumor-agnostic strategies, particularly in addressing cancer therapy resistance.[221.1] Furthermore, the development of novel strategies, such as modified oligonucleotides and targeted delivery systems, aims to overcome challenges related to the specificity, stability, and immune responses associated with ncRNA therapies.[220.1] In addition to ncRNAs, cell reprogramming techniques are being explored for their applications in developmental biology, disease modeling, drug development, regenerative medicine, and cancer immunotherapy. These approaches hold promise for enhancing the efficacy of cancer therapies and tailoring treatments to individual patient needs.[183.1] Successful examples from recent clinical trials highlight the potential of utilizing reprogrammed cells in cancer therapy, suggesting a future direction where personalized interventions could significantly improve patient outcomes.[186.1]In this section:
References
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[2] Cell signaling - Wikipedia — Reception occurs when the target cell (any cell with a receptor protein specific to the signal molecule) detects a signal, usually in the form of a small, water-soluble molecule, via binding to a receptor protein on the cell surface, or once inside the cell, the signaling molecule can bind to intracellular receptors, other elements, or stimulate enzyme activity (e.g. gasses), as in intracrine signaling.
[3] Cell Signaling - Fundamentals of Cell Biology — A cell’s first point of contact with the outside world is when one of its receptors binds to a ligand and a signaling pathway is activated. In this case, the extracellular signal molecule binds and initiates the conformation change in the receptor, which activates it and allows it to generate a response inside the cell. When a signal molecule binds, this activates the G-protein-coupled receptor. Each of the kinases that gets activated in the cascade has the capacity to go on and activate many other proteins and enzymes, effectively amplifying the signal inside the cell. Describe activation of a G-protein-coupled receptor (GPCR) pathway from the binding of a signal at a GPCR to the activation of downstream signaling molecules.
[4] Stimulus-specific responses in innate immunity ... - Cell Press — Immune sentinel cells initiate immune responses to pathogens and tissue injury and are capable of producing highly stimulus-specific responses. Insight into the mechanisms underlying such specificity has come from the identification of regulatory factors and biochemical pathways, as well as the definition of signaling circuits that enable combinatorial and temporal coding of information. Here
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[44] Conceptual Evolution of Cell Signaling - PubMed — During the last 100 years, cell signaling has evolved into a common mechanism for most physiological processes across systems. Although the majority of cell signaling principles were initially derived from hormonal studies, its exponential growth has been supported by interdisciplinary inputs, e.g., …
[45] Cell-cell communication: new insights and clinical implications — In multicellular organisms, cells have evolved different intercellular communication modes to develop and regulate their coordinated functions.29 At the macroscopic level, direct physical contacts between adjacent cells lead to the formation of tissues and barrier structures, while at the microscopic scale, they drive changes in cellular signaling pathways and activation states.24 Comprehending how biological components synergize to orchestrate biochemical, genetic, and biophysically mediated cell interaction events among diverse cell types constitutes the essence of enhancing our understanding of the biology underlying CCCs (Fig. 1).
[47] Signal transduction at the single-cell level: Approaches to study the ... — Recent technological advances to observe cellular response, computationally model signaling pathways, and experimentally manipulate cells now enables studying signal transduction at the single-cell level. The ability to fully comprehend signal transduction at the single-cell level requires advancements in how we observe cells, model cellular behavior, and manipulate biological systems. In the following review we will discuss the specific methods and developments used to observe, model, and manipulate biological systems to study dynamic signal transduction at the single-cell level. Measuring the signaling state, or the level of activation of a specific molecule in a signal transduction pathway, at the single-cell level based on fluorescent biosensors as described above requires quantifying the fluorescent levels at single-cell resolution. Signal transduction studies at the single-cell level provide information about the dynamic nature of biological signaling networks.
[48] PDF — The application of systems biology to cell signaling has led to significant advances in our understanding of the complexity of the cellular network. The integration of multiple omics data sets and the use of network analysis methods and mathematical models have facilitated the identification of key molecular players and pathways that are
[50] Integrative model of human cell signalling - Stanford Medicine — For this project, we bring together expertise in human cell signaling, and large-scale, integrative computational modeling. Our aim is to use techniques derived from "whole-cell" models of bacteria to produce a comprehensive model of cell signaling in humans. Whole cell computational models provide a holistic view of cell function.
[52] BRMI | History - Claude Bernard — Claude Bernard's pioneering discoveries in physiology and experimental medicine influenced many bioregulatory principles of today. Explore his profound insights into the pancreas, liver, and physiological equilibrium, shaping the foundation of modern biology and introducing the concept of homeostasis. Discover how his work continues to shape clinical bioregulatory medicine.
[53] Claude Bernard | French Physiologist, Experimentalist & Philosopher ... — Claude Bernard was a French physiologist known chiefly for his discoveries concerning the role of the pancreas in digestion, the glycogenic function of the liver, and the regulation of the blood supply by the vasomotor nerves. On a broader stage, Bernard played a role in establishing the principles
[60] Modes and motifs in multicellular communication - Cell Press — The development and homeostasis of multicellular organisms depend on the communication between cells, often mediated by signals that bind to receptors expressed in target cells. ... and Wnt pathways. Through gene duplication and divergence during evolution, ... Cell signaling: principles and mechanisms. Garland Science, 2015.
[61] The many roads to and from multicellularity - Oxford Academic — Based on our review, we conclude that the evolution of multicellular organisms requires three phases (origination by disparate cell-cell attachment modalities, followed by integration by lineage-specific physiological mechanisms, and autonomization by natural selection) that have been achieved differently in different lineages.
[62] Conceptual Evolution of Cell Signaling - PubMed — During the last 100 years, cell signaling has evolved into a common mechanism for most physiological processes across systems. Although the majority of cell signaling principles were initially derived from hormonal studies, its exponential growth has been supported by interdisciplinary inputs, e.g., from physics, chemistry, mathematics, statistics, and computational fields.
[76] Evolution of Intercellular Communication Channels | SpringerLink — Intercellular communication is a universal biological activity without which even the most primitive multicellular animals could not exist, and which, in the course of evolution, has been preceded by the exchange of information among unicellular organisms via the extracellular milieu. This fundamental capacity of cells to receive and respond to signals is the basis of the elaborate integrative
[77] Cell-cell communication: new insights and clinical implications — In multicellular organisms, cells have evolved different intercellular communication modes to develop and regulate their coordinated functions.29 At the macroscopic level, direct physical contacts between adjacent cells lead to the formation of tissues and barrier structures, while at the microscopic scale, they drive changes in cellular signaling pathways and activation states.24 Comprehending how biological components synergize to orchestrate biochemical, genetic, and biophysically mediated cell interaction events among diverse cell types constitutes the essence of enhancing our understanding of the biology underlying CCCs (Fig. 1).
[83] Understanding the Types of Cell Signaling Mechanisms — Understanding the Types of Cell Signaling Mechanisms - BiologyInsights Understanding the Types of Cell Signaling Mechanisms Explore the diverse mechanisms of cell signaling and their roles in cellular communication and function. Cell signaling is a fundamental process that governs communication between cells, orchestrating a myriad of biological functions essential for life. Autocrine signaling involves a cell targeting itself by releasing signaling molecules that bind to receptors on its own surface. In the immune system, T cells use autocrine signaling to proliferate in response to an antigen, ensuring an effective immune response. Endocrine signaling involves the release of hormones into the bloodstream, allowing them to travel vast distances to reach target cells throughout the body.
[86] Autocrine regulation of T-cell activation by ATP release and P2X — T-cell activation requires the influx of extracellular calcium, although mechanistic details regarding such activation are not fully defined. Here, we show that P2X 7 receptors play a key role in calcium influx and downstream signaling events associated with the activation of T cells. By real-time PCR and immunohistochemistry, we find that Jurkat T cells and human CD4 + T cells express
[87] ATP release and autocrine signaling through P2X4 receptors ... - PubMed — Purinergic signaling plays a key role in a variety of physiological functions, including regulation of immune responses. Conventional αβ T cells release ATP upon TCR cross-linking; ATP binds to purinergic receptors expressed by these cells and triggers T cell activation in an autocrine and paracrine manner.
[88] Autocrine and paracrine IL-2 signals collaborate to ... - Cell Press — Using murine models of conditional T-cell-specific IL-2 ablation, Toumi et al. highlight the distinct roles of paracrine and autocrine IL-2 in regulating effector and memory CD8 T cell responses, respectively. CD8 T-cell-derived IL-2 is critical for programming robust secondary expansion potential in memory-fated cells.
[89] Interleukin-2 signaling in the regulation of T cell biology in ... — Our knowledge concerning the contributions of IL-2 in T cell biology, particularly its role in the development and functional activity of regulatory, effector, and memory T cells and reinvigorating exhausted T cells, continues to advance. These cells depend on distinctive IL-2R signaling thresholds, providing a pharmacological window for the immunotherapy of autoimmunity and cancer. Here, we
[90] Interleukin-2-dependent autocrine proliferation in T-cell development — The IL-2/IL-2R beta interaction on these cells induces the expression of IL-2R alpha, leading to high-affinity IL-2R display and cellular proliferation. We suggest that this IL-2-dependent autocrine pathway of growth stimulation plays a key role in the intrathymic development of mature T cells.
[92] Autocrine Signaling - Biology Simple — Autocrine signaling plays a vital role in various physiological processes, including immune response, development, and tissue repair. Understanding the mechanisms behind autocrine signaling can provide valuable insights into cellular behavior and help in the development of therapeutic strategies for diseases like cancer.
[94] What is the Difference Between Autocrine and Paracrine — The main difference between autocrine and paracrine is that the autocrine factors act on the cells which produce them whereas the paracrine factors act on the cells that are in close proximity to the cells that produce them. Autocrine and paracrine are two terms used to describe various factors that are a part of the cell signaling mechanisms. Furthermore, the growth factors which stimulate
[95] Anatomy & Physiology II Chapter 16 Endocrine System — Paracrine signaling is crucial for coordinating activities between different types of cells in a local environment, allowing them to work together in a coordinated manner. Differences from Hormones: Distance of Action: Autocrine: Affects the same cell that released the signaling molecules. Paracrine: Affects nearby cells within the same tissue.
[102] Autocrine Signaling - Biology Simple — This self-regulatory mechanism plays a crucial role in maintaining cellular homeostasis and overall tissue function. Importance In Physiology. Importance in Physiology: Autocrine signaling plays a crucial role in maintaining internal balance. It involves cells secreting signaling molecules that act on the same cell.
[104] Immune cell regulation by autocrine purinergic signalling — Crosstalk of paracrine signals with autocrine purinergic signalling mechanisms makes it possible for immune cells to adapt their responses to extracellular cues generated by surrounding cells in different tissues.
[105] The dichotomic role of single cytokines: Fine-tuning immune responses — Cytokines will stimulate transcriptional changes in cells that express their respective receptors in an autocrine, paracrine and endocrine way . As strong stimulators of cell changes, cytokine signaling can be regulated at many levels, from soluble antagonists to transcription factors inhibitors .
[109] Understanding the Types of Cell Signaling Mechanisms — Understanding the Types of Cell Signaling Mechanisms - BiologyInsights Understanding the Types of Cell Signaling Mechanisms Explore the diverse mechanisms of cell signaling and their roles in cellular communication and function. Cell signaling is a fundamental process that governs communication between cells, orchestrating a myriad of biological functions essential for life. Autocrine signaling involves a cell targeting itself by releasing signaling molecules that bind to receptors on its own surface. In the immune system, T cells use autocrine signaling to proliferate in response to an antigen, ensuring an effective immune response. Endocrine signaling involves the release of hormones into the bloodstream, allowing them to travel vast distances to reach target cells throughout the body.
[113] Paracrine: What is it? Cell Signaling, Stages, Pathways, Types of ... — Paracrine signaling is a form of cell-to-cell communication; is the process in which a cell produces a signal to induce changes in the vicinity of cells, Menu. Health. ... Together, cells can coordinate everything from neonatal development to large cascading immune responses against bacteria or viruses. Stages of cell signaling. At its core
[114] Intercellular Calcium Signaling Induced by ATP Potentiates Macrophage ... — Exchange of information is critical for an efficient immune response. Here, Zumerle et al. show that macrophages exploit ATP release as a paracrine communication mechanism to propagate calcium signals to neighboring cells. Signal propagation relies on P2X4 and P2X7 receptors and sustains macrophage phagocytosis.
[115] Autocrine Signaling - Biology Simple — Autocrine signaling plays a vital role in various physiological processes, including immune response, development, and tissue repair. Understanding the mechanisms behind autocrine signaling can provide valuable insights into cellular behavior and help in the development of therapeutic strategies for diseases like cancer.
[116] Autocrine Signalling - an overview | ScienceDirect Topics — Autocrine signaling is defined as a cell receiving a signal secreted by itself. From: Seminars in Cancer Biology, 2023. About this page. ... resulting in their clonal proliferation for amplification of the immune response. 5 Autocrine signaling is also widely observed in cancer cell proliferation, drug resistance,
[121] Advances in cancer therapy: unveil the immunomodulatory protein ... — These targeted therapies aim to modulate specific signaling pathways associated with the immune response against cancer cells. By pinpointing immune genes involved in signaling, researchers can develop drugs that either enhance the immune system's ability to recognize and eliminate cancer cells or inhibit signaling pathways that contribute to
[122] PDF — Types of Cell Communication: Autocrine, Paracrine, and Endocrine Signaling Ana Olivera* Department of Cell Biology, University of Notre Dame, Notre Dame, United States of America DESCRIPTION Cell communication is important in multicellular organisms allowing cells to interact, coordinate, and respond to their environment. Three prominent modes of cell communication are autocrine, paracrine, and endocrine signaling play important roles in maintaining homeostasis, regulating development, and responding to external cues. Once the signaling molecule binds to its receptor on the target cell, it triggers a series of intracellular signaling pathways that lead to specific cellular responses. Endocrine signaling involves the release of signaling molecules (hormones) into the bloodstream, where they travel to distant target cells, often in different tissues or organs. Citation: Olivera A (2023) Types of Cell Communication: Autocrine, Paracrine, and Endocrine Signaling.
[123] Autocrine vs Paracrine vs Endocrine: What are the Differences? — In this quick easy lesson, we explain the differences between autocrine, paracrine, juxtacrine, and endocrine signaling, the functions of these types of intercellular signaling, examples of autocrine, paracrine, juxtacrine, and endocrine, as well as mnemonic tips to learn them easily. Unlike autocrine and paracrine hormones, endocrine hormones are secreted into the blood stream and act on distant target cells, not self or local cells. Endocrine signaling, in comparison to autocrine and paracrine, is also relatively slower because it relies on blood flow. Summary of Differences between Autocrine, Paracrine, and Endocrine Hormones/Signaling There are two main differences between autocrine, paracrine, and endocrine signaling: location and speed. Endocrine is relatively slow compared to autocrine and paracrine signaling. Excellent post on autocrine vs paracrine vs endocrine!! Helpful article!!
[158] Cellular stress response and innate immune signaling: integrating ... — PRR signaling pathways in innate immune cells. Innate immune cells recognize broad groups of pathogens, such as bacteria and viruses, through components that are conserved within each group. ... For example, immune reactivity to Hsp70 and -90 has been shown in autoimmune and chronic inflammatory diseases, such as rheumatoid arthritis,
[159] Signaling Organelles of the Innate Immune System - Cell Press — For example, at the cell surface, TLR activation induces the expression of NF-κB-dependent cytokines, whereas endosomal TLRs induce both cytokine and type ... There are some innate immune signaling pathways that are not yet understood enough to reliably predict where signal transduction occurs and whether any regulator of signaling has sorting
[160] Chapter 6 Signaling Through Immune System Receptors — Cells communicate with their environment through a variety of cell-surface receptors that recognize and bind molecules present in the extracellular environment. The main function of T and B lymphocytes is to respond to antigen and so, in their case, the receptors for antigen are the most important and the best-studied. Binding of antigen to these receptors generates intracellular signals that
[161] Pathways of Intracellular Signal Transduction - The Cell - NCBI Bookshelf — Protein kinase C then activates other intracellular targets, including a cascade of protein kinases known as the MAP kinase pathway (discussed in detail in the next section), leading to transcription factor phosphorylation, changes in gene expression, and stimulation of cell proliferation. The formation of PIP3 thus results in the association of both Akt and PDKs with the plasma membrane, leading to phosphorylation and activation of Akt. Once activated, Akt phosphorylates a number of target proteins, including proteins that are direct regulators of cell survival, transcription factors, and other protein kinases that regulate cell metabolism and protein synthesis. ERK activation plays a central role in signaling cell proliferation induced by growth factors that act through either protein-tyrosine kinase or G protein-coupled receptors.
[163] Key signal transduction pathways and crosstalk in cancer: Biological ... — This concise summary will provide a selective review of recent studies of key signal transduction pathways, including mitogen-activated protein kinase (MAPK) pathway, Phosphatidylinositol-3-kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) signaling, and Wnt/β-catenin signaling pathway, which are altered in cancer cells, as the novel and promising therapeutic targets. Here, in order to understand the architecture of the key signaling network, we outline the current general aspects of three key signaling pathways, including the MAPK pathway, PI3K/AKT/mTOR signaling, and Wnt/β-catenin signaling pathway, the components in signaling pathways, and the relationship between factors and therapeutic opportunities. The key regulatory pathways, such as MAPK pathway, PI3K/AKT/mTOR signaling, and Wnt/β-catenin signaling pathway, play essential roles in the regulation of signal transduction and biological processes such as cell proliferation, apoptosis, metabolism, and so on.
[164] Cell Signaling Pathways in Cancer: an Overview — Cell Signaling Pathways in Cancer: an Overview However, in cancer, these signaling pathways often become dysregulated. This article explores the major cell signaling pathways involved in cancer, their roles in tumor progression, and the current therapeutic approaches targeting these pathways. Overview of Cell Signaling Pathways in Cancer Oncogenic signaling pathways are central to the transformation of normal cells into cancer cells. Therapeutic Targeting of Cell Signaling Pathways Targeting dysregulated cell signaling pathways has revolutionized cancer therapy, offering more precise and effective treatment options. The future of cancer therapy lies in unraveling the complexities of signaling pathways and leveraging this knowledge to enhance diagnosis, prognosis, and treatment. Understanding cell signaling pathways is crucial for unraveling cancer biology and developing effective therapies.
[165] Inflammation and tumor progression: signaling pathways and targeted ... — Chronic inflammation facilitates tumor progression and treatment resistance, whereas induction of acute inflammatory reactions often stimulates the maturation of dendritic cells (DCs) and antigen presentation, leading to anti-tumor immune responses. In addition, multiple signaling pathways, such as nuclear factor kappa B (NF-kB), Janus kinase/signal transducers and activators of transcription (JAK-STAT), toll-like receptor (TLR) pathways, cGAS/STING, and mitogen-activated protein kinase (MAPK); inflammatory factors, including cytokines (e.g., interleukin (IL), interferon (IFN), and tumor necrosis factor (TNF)-α), chemokines (e.g., C-C motif chemokine ligands (CCLs) and C-X-C motif chemokine ligands (CXCLs)), growth factors (e.g., vascular endothelial growth factor (VEGF), transforming growth factor (TGF)-β), and inflammasome; as well as inflammatory metabolites including prostaglandins, leukotrienes, thromboxane, and specialized proresolving mediators (SPM), have been identified as pivotal regulators of the initiation and resolution of inflammation. Herein, we discuss the initiation and resolution of inflammation, the crosstalk between tumor development and inflammatory processes. We also highlight potential targets for harnessing inflammation in the treatment of cancer.
[166] Signaling Pathways in Cancer: Therapeutic Targets, Combinatorial ... — Save citation to file Signaling Pathways in Cancer: Therapeutic Targets, Combinatorial Treatments, and New Developments Signaling Pathways in Cancer: Therapeutic Targets, Combinatorial Treatments, and New Developments Molecular alterations in cancer genes and associated signaling pathways are used to inform new treatments for precision medicine in cancer. Here we provide an up-to-date review of the successes and limitations of current targeted therapies for cancer treatment and highlight how recent technological advances have provided a new level of understanding of the molecular complexity underpinning resistance to cancer therapies. PROTACS; RTK; cancer resistance; combinatorial treatments; oncogenes and tumor suppressors; signaling pathways; targeted therapies. PubMed Disclaimer The authors declare no conflict of interest. Targeted therapies for cancer treatment.… Targeted therapies for cancer treatment.
[168] Mathematical Modeling of Proliferative Immune Response Initiated by ... — During an adaptive immune response from pathogen invasion, multiple cytokines are produced by various immune cells interacting jointly at the cellular level to mediate several processes. For example, studies have shown that regulation of interleukin-4 (IL-4) correlates with interleukin-2 (IL-2) induced lymphocyte proliferation.
[169] Autocrine Signalling - an overview | ScienceDirect Topics — Since then, researchers have found many examples of autocrine signaling in various mammalian cells [2,29-34] (Figure 2 B-D). In the human immune system, naive T-helper (Th) cells use the molecules Interleukin (IL)-4 and interferon-γ for autocrine signaling, to differentiate into one of two cell states (Th1 or Th2 cells) .
[181] Chemotherapeutic drugs: Cell death- and resistance-related signaling ... — Moreover, aberrant activation of cell survival signaling pathways, including PI3K, AKT, and mammalian target of rapamycin (mTOR), is related to increased tumor mass , , . RSK proteins, such as Ras-ERK mediators that play a significant role in cell survival necessities [ 65 , 66 ], have been shown to activate BCL-2 and NHE1 to dampen apoptosis
[182] Accelerating Live Single-Cell Signalling Studies — The advent of live single-cell imaging approaches now facilitates collecting data describing signalling network activity at sampling rates high enough to study the dynamics of information transfer in living cells [5-9]. This emerging field has seen rapid development in the number of measurable signalling elements , the length of time that dynamics can be analysed over , and the
[183] Cell reprogramming: methods, mechanisms and applications — Finally, the widespread applications and future directions of cell reprogramming in developmental biology, disease modeling, drug development, regenerative medicine, cell therapy and cancer immunotherapy will be discussed.
[186] The clinical landscape of CAR-engineered unconventional T cells — We discuss successful examples from recent clinical trials and explore future directions for utilizing these cells in cancer therapy and beyond.
[187] Integrating Multiple Types of Data for Signaling Research: Challenges ... — However, solving the fundamental issues of data sharing will enable the investigation of entirely new areas of cell signaling research. Introduction Understanding how signaling pathways operate has always been one of the greatest challenges in biology because of their inherent complexity.
[188] Emerging proteomic technologies for elucidating context-dependent ... — Aberrant cell signaling events either drive or compensate for nearly all pathologies. ... context-specific signaling studies present challenges and technical demands that push the limits of existing technologies. ... Srour EF, Badve S. Breast cancer stem cells and intrinsic subtypes: controversies rage on. Current stem cell research & therapy
[189] Signal transduction at the single-cell level: Approaches to study the ... — Recent technological advances to observe cellular response, computationally model signaling pathways, and experimentally manipulate cells now enables studying signal transduction at the single-cell level. The ability to fully comprehend signal transduction at the single-cell level requires advancements in how we observe cells, model cellular behavior, and manipulate biological systems. In the following review we will discuss the specific methods and developments used to observe, model, and manipulate biological systems to study dynamic signal transduction at the single-cell level. Measuring the signaling state, or the level of activation of a specific molecule in a signal transduction pathway, at the single-cell level based on fluorescent biosensors as described above requires quantifying the fluorescent levels at single-cell resolution. Signal transduction studies at the single-cell level provide information about the dynamic nature of biological signaling networks.
[191] NcPath: a novel platform for visualization and enrichment analysis of ... — In addition, only few studies explored the integration of both miRNA and lncRNA with pathway databases. The development of a more comprehensive relationship of non-coding RNAs and gene regulation in human biological pathways thus represents an urgent research goal at present.
[192] Unveiling the challenges of short non-coding RNAs and their prospects ... — This figure presents a comprehensive overview of the challenges, prospects, and strategies associated with delivering short non-coding RNAs (sncRNAs) for cancer therapy. It highlights the obstacles, such as poor cell penetration, immune system activation, renal clearance, etc., that must be overcome to effectively utilize sncRNAs in clinical
[193] Exploring the role of noncoding RNAs in cancer diagnosis, prognosis ... — Regarding the clinical and therapeutics of ncRNA, developing ncRNA therapies for cancer treatment faces numerous challenges, including delivering therapeutic drugs to target cells without disrupting normal cellular functions. ... Grillone K., et al. Non-coding RNAs in cancer: platforms and strategies for investigating the genomic "dark matter
[194] An operational view of intercellular signaling pathways - PMC — To address these questions, researchers have begun to reconstitute signaling pathways in living cells, analyzing their dynamic responses to stimuli, and developing new functional representations of their behavior. ... in mammalian cells, Lunatic Fringe strengthens cis and trans interactions between the Notch1 receptor and the Dll1 ligand, while
[195] Signaling Networks - Cell Press — Networks result from interconnections between signaling pathways. Such interconnections occur because the same signaling component is capable of receiving signals from multiple inputs. ... signal input in the case of the neuron is the diffusible neurotransmitter glutamate and in the case of the T cell are cell-cell interactions with the
[196] Cell Signaling: Types, Mechanisms & Pathways - Danaher Life Sciences — It can potentially lead to the development of new diagnostic tools and therapies for various diseases, as understanding the complex interactions between signaling molecules and receptors can help develop novel drugs that can more precisely target specific signaling pathways. Cell signaling also plays a vital role in regulating cell
[197] Making sense of BMP signaling complexity: Cell Systems — Cellular signaling systems are immensely complex. Dedicated experimental and theoretical approaches are therefore required to decipher how they function. In this issue of Cell Systems, two studies systematically interrogate the Bone Morphogenetic Protein (BMP) pathway, uncovering mechanisms and consequences of distinct responses to combinations of BMP ligands.
[200] Impact of CRISPR in cancer drug discovery | Science - AAAS — Since its discovery in 2012 as a gene-editing tool, CRISPR-Cas9 has been touted as a turning point for drug discovery. Indeed, CRISPR-based technologies have an unprecedented power to interrogate the mechanistic underpinnings of disease by systematically testing the cellular effects of targeted genetic alterations ().Disease hallmarks specific to cancer, such as unchecked cell proliferation
[201] CRISPR/Cas technologies for cancer drug discovery and treatment — Clustered regularly interspaced short palindromic repeats (CRISPR) tools are revolutionizing the establishment of genotype-phenotype relationships and are transforming cell- and gene-based therapies. In the field of oncology, CRISPR/CRISPR-associated protein 9 (Cas9), Cas12, and Cas13 have advanced the generation of cancer models, the study of tumor evolution, the identification of target
[202] CRISPR applications in cancer diagnosis and treatment - PMC — Encouraging results have been obtained from clinical trials employing CRISPR-Cas9 in patients with refractory cancer, particularly in the realm of T cell therapy, where synthetic chimeric antigen receptor (CAR)-T cells have been programmed using CRISPR-Cas9 . CAR-T cells are genetically engineered to specifically target tumor antigen-expressing
[220] Non-coding RNAs: emerging biomarkers and therapeutic targets in cancer ... — Specificity, stability, and immune responses are obstacles to the therapeutic use of ncRNAs; however, novel strategies, such as modified oligonucleotides and targeted delivery systems, are being developed. ncRNA profiling may result in more individualized and successful treatments as precision medicine advances, improving patient outcomes and
[221] Targeting non-coding RNAs to overcome cancer therapy resistance - Nature — In summary, because ncRNAs are key regulators and predictors of cancer therapy resistance, they could function as therapeutic adjuvants and as components of a tumor-agnostic therapeutic strategy