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Direct conversion of human fibroblasts to brown adipocytes by small chemical compounds.
Scientific Reports 2017 June 28
Brown adipocytes play an important role in human energy metabolism and prevention of obesity and diabetes. Induced pluripotent stem cells (iPSCs) represent a promising source for brown adipocytes; however, exogenous gene induction is generally required for iPSCs generation, which might cause undesired effects particularly in long-term treatment after transplantation. We have previously reported a cocktail of six small chemical compounds that enables a conversion of human fibroblasts into chemical compound-induced neuronal cells (CiNCs). Here, we report that modified combinations of the chemical compounds and rosiglitazone, a PPARγ agonist, afforded direct conversion of human fibroblasts into brown adipocytes. The chemical compound-induced brown adipocytes (ciBAs) exhibit induction of human brown adipocyte-specific genes such as Ucp1, Ckmt1, Cited1 and other adipocyte-specific genes such as Fabp4, AdipoQ, and Pparγ. Treatment with either isoproterenol or Forskolin further induced the expression of Ucp1, suggesting that β adrenergic receptor signalling in ciBAs could be functional for induction of thermogenic genes. Moreover, oxygen consumption rates were elevated in ciBAs along with increase of cellular mitochondria. Our findings might provide an easily accessible approach for generating human brown adipocytes from fibroblasts and offer therapeutic potential for the management of obesity, diabetes, and related metabolic disorders.
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