The de novo differentiation of hyperplastic adipocytes from adipocyte progenitor cells (APCs) is accompanied by a reduction in adipose tissue fibrosis and inflammation and improvement in insulin sensitivity in obesity and aging. However, the regulators of APC proliferation are poorly understood. Here, we show that fibroblast growth factor 6 (FGF6) acts in an autocrine and/or paracrine manner to control platelet-derived growth factor receptor α–positive APC proliferation via extracellular signal–regulated kinase (ERK) signaling. Specific FGF6 overexpression in inguinal white adipose tissue (iWAT) improved the signs of high-fat diet– or aging-induced adipose hypertrophy and insulin resistance. Conversely, chronic FGF6 expression blockade in iWAT, mediated by a neutralizing antibody or Fgf6 expression deficiency, impaired adipose tissue expansion and glucose tolerance. Overall, our data suggest that FGF6 acts as a proliferative factor for APCs to maintain fat homeostasis and insulin sensitivity.
- Fibroblast growth factor 6 (FGF6) promotes platelet-derived growth factor receptor α–positive adipocyte progenitor cell proliferation via extracellular signal–regulated kinase signaling.
- FGF6 overexpression in inguinal white adipose tissue (iWAT) of lean mice prevents high-fat diet (HFD)–induced obesity and insulin resistance.
- FGF6 treatment in iWAT of diet-induced obese or aging mice improved the signs of adipose hypertrophy and insulin resistance.
- FGF6 blockade or genetic Fgf6 deficiency in HFD-fed mice results in impairment of adipose tissue expansion and insulin sensitivity.
…. more: Diabetes Journals (ADA) (Quelle/Source)
