Add time:07/15/2019         Source:sciencedirect.com

Preadipocytes constitutively express GATA-2 and GATA-3 that are required to halt the cells at the undifferentiated stage. However, we unexpectedly found that K-7174, a GATA-specific inhibitor, did not induce but rather inhibited differentiation of 3T3-L1 preadipocytes. It was associated with lack of lipid accumulation, blunted expression of adipocyte markers including adiponectin and peroxisome proliferator-activated receptor γ (PPARγ), and sustained expression of a preadipocyte marker monocyte chemoattractant protein 1 (MCP-1). Subsequent experiments revealed that K-7174 had the potential to induce endoplasmic reticulum (ER) stress evidenced by induction of GRP78 and CHOP. Other inducers of ER stress completely reproduced the effects of K-7174 including suppression of lipid accumulation, blockade of induction of adiponection and PPARγ and maintenance of MCP-1 expression. These results indicated a possibility that ER stress suppresses adipocyte differentiation and that GATA inhibitor K-7174 has the potential for interfering with adipogenesis through induction of ER stress.

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