Biphasic effects of FGF2 on adipogenesis

Area of Science:

• Biochemistry
• Cell Biology
• Stem Cell Research

Background:

• Conflicting reports exist on Fibroblast Growth Factor 2's (FGF2) role in adipogenesis.
• Previous studies on FGF2's effect on adipogenesis in vitro have yielded inconsistent results.

Purpose of the Study:

• To investigate the concentration-dependent effects of FGF2 on in vitro adipogenesis.
• To elucidate the molecular mechanisms underlying FGF2's influence on adipogenesis and adipose tissue development.

Main Methods:

• Utilized human adipose-derived stem cells (hASCs) for in vitro culture.
• Investigated the role of FGF2 at varying concentrations (low < 2 ng/ml, high > 10 ng/ml).
• Analyzed the activation of the ERK signaling pathway and its regulation by FGF2.

Main Results:

• FGF2 at low concentrations (< 2 ng/ml) enhanced hASC adipogenesis.
• FGF2 at high concentrations (> 10 ng/ml) suppressed adipogenesis by sustaining ERK phosphorylation.
• High FGF2 concentrations acted as a dominant negative factor against BMP ligands.
• Lower FGF2 expression was observed in fat tissues of obese mice compared to normal mice.

Conclusions:

• FGF2 exhibits a concentration-dependent biphasic effect on adipogenesis.
• FGF2's dominant-negative effect on BMP ligands contributes to its inhibitory role.
• Findings provide a mechanistic understanding of FGF2's role in adipogenesis and fat tissue regulation.