Bovine Preadipocytes

Bovine preadipocytes are fibroblast-like, undifferentiated progenitor cells residing within the stromal vascular fraction of adipose tissue depots. These cells exhibit characteristic spindle-shaped morphology and robust proliferative capacity prior to differentiation. Immunophenotypically, bovine preadipocytes can be characterized using surface markers including CD13, CD26, CD146, and CD54, with recent studies identifying CD13 as a bona-fide marker that enables 10.3-fold higher adipogenic efficiency upon cell sorting.

A key advantage of bovine preadipocytes lies in their depot-specific heterogeneity, which faithfully recapitulates in vivo adipose biology. Intramuscular preadipocytes express muscle-specific genes such as MYOG, MB, and MYH3 and are proposed to originate from satellite cells, whereas subcutaneous preadipocytes display distinct transcriptomic profiles and greater lipid-accumulating capacity. Upon adipogenic induction with insulin, dexamethasone, and PPARγ agonists, these cells undergo terminal differentiation into mature adipocytes, characterized by lipid droplet accumulation and upregulated expression of PPARγ, C/EBPα, FABP4, and ACC1. Spontaneously immortalized bovine preadipocyte lines have been established, proliferating over 100 days and 21 passages while retaining differentiation competence, with proteomic profiling identifying over 2,000 proteins enriched in PPAR signaling and ERK1/2 pathways.

Bovine preadipocytes serve as an indispensable ex vivo platform for studying adipogenesis, lipid metabolism, marbling deposition, and meat quality determination. They are widely employed in nutrigenomics, drug screening, and regulatory RNA research. Furthermore, their demonstrated viability in suspension and strong scaffold attachment make them a pivotal cellular resource for cultured fat production in cellular agriculture, bridging fundamental adipocyte biology with translational applications in food biotechnology and veterinary science.