Tracing from Fat Tissue, Liver, and Pancreas: A Neuroanatomical Framework for the Role of the Brain in Type 2 Diabetes

TLDR

The hypothalamus regulates energy balance via hormones and the autonomic nervous system. The study proposes that compartment‑specific autonomic organization explains regional organ dysfunction in type 2 diabetes, linking pancreatic insulin secretion, hepatic glucose metabolism, and visceral adipose activity. The authors found that autonomic neurons are compartment‑specific, with distinct circuits controlling intraabdominal organs versus subcutaneous adipose, a differentiation extending to preautonomic hypothalamic neurons and including feedback from adipose tissue to the brainstem.

Abstract

The hypothalamus uses hormones and the autonomic nervous system to balance energy fluxes in the body. Here we show that the autonomic nervous system has a distinct organization in different body compartments. The same neurons control intraabdominal organs (intraabdominal fat, liver, and pancreas), whereas sc adipose tissue located outside the abdominal compartment receives input from another set of autonomic neurons. This differentiation persists up to preautonomic neurons in the hypothalamus, including the biological clock, that have a distinct organization depending on the body compartment they command. Moreover, we demonstrate a neuronal feedback from adipose tissue that reaches the brainstem. We propose that this compartment-specific organization offers a neuroanatomical perspective for the regional malfunction of organs in type 2 diabetes, where increased insulin secretion by the pancreas and disturbed glucose metabolism in the liver coincide with an augmented metabolic activity of visceral compared with sc adipose tissue.