Dissimilar Differentiation of Mesenchymal Stem Cells from Bone Marrow, Umbilical Cord Blood, and Adipose Tissue

TLDR

Mesenchymal stem cells (MSCs) are attractive for cell‑based therapies because they can be readily isolated from adult tissues without ethical concerns, yet reports on their differentiation potential and marker expression remain inconsistent. This study aimed to compare MSCs isolated from bone marrow, umbilical cord blood, and adipose tissue to determine differences in isolation efficiency and differentiation capacity. The authors isolated MSCs from each source, assessed morphology and immunophenotype, performed osteogenic, chondrogenic, and adipogenic differentiation assays, and quantified lineage‑specific gene expression (FAPB4, ALP, type II collagen) by qPCR. Isolation yielded 100 % efficiency for bone marrow and adipose MSCs but only 30 % for cord blood; osteogenic and chondrogenic differentiation were comparable across all sources, whereas adipogenic potential was markedly lower in cord blood MSCs and more mature in bone marrow MSCs, underscoring the need to select the appropriate MSC source for clinical use.

Abstract

Mesenchymal stem cells (MSCs) have been investigated as promising candidates for use in new cell-based therapeutic strategies such as mesenchyme-derived tissue repair. MSCs are easily isolated from adult tissues and are not ethically restricted. MSC-related literature, however, is conflicting in relation to MSC differentiation potential and molecular markers. Here we compared MSCs isolated from bone marrow (BM), umbilical cord blood (UCB), and adipose tissue (AT). The isolation efficiency for both BM and AT was 100%, but that from UCB was only 30%. MSCs from these tissues are morphologically and immunophenotypically similar although their differentiation diverges. Differentiation to osteoblasts and chondroblasts was similar among MSCs from all sources, as analyzed by cytochemistry. Adipogenic differentiation showed that UCB-derived MSCs produced few and small lipid vacuoles in contrast to those of BM-derived MSCs and AT-derived stem cells (ADSCs) (arbitrary differentiation values of 245.57 +/- 943 and 243.89 +/- 145.52 mum(2) per nucleus, respectively). The mean area occupied by individual lipid droplets was 7.37 mum(2) for BM-derived MSCs and 2.36 mum(2) for ADSCs, a finding indicating more mature adipocytes in BM-derived MSCs than in treated cultures of ADSCs. We analyzed FAPB4, ALP, and type II collagen gene expression by quantitative polymerase chain reaction to confirm adipogenic, osteogenic, and chondrogenic differentiation, respectively. Results showed that all three sources presented a similar capacity for chondrogenic and osteogenic differentiation and they differed in their adipogenic potential. Therefore, it may be crucial to predetermine the most appropriate MSC source for future clinical applications.