Control of preadipocyte proliferation, apoptosis and early adipogenesis by the forkhead transcription factor FoxO6

文献类型： 外文期刊

第一作者： Li, Zhenhui

作者： Li, Zhenhui;Nie, Qinghua;Li, Zhenhui;Nie, Qinghua

作者机构：

关键词： Gene expression; Preadipocyte proliferation; Apoptosis; Early adipogenesis; FoxO6

期刊名称：LIFE SCIENCES （ 影响因子：5.037； 五年影响因子：4.689 ）

ISSN： 0024-3205

年卷期： 2021 年 265 卷

页码：

收录情况： SCI

摘要： Aims: Previous studies have shown that the forkhead transcription factor FoxO6 involved in memory consolidation and hepatic glucose homeostasis. Here we asked whether chicken FoxO6 may regulate preadipocyte proliferation, apoptosis and early adipogenesis. Main methods: Overexpression and knockdown of FoxO6 were performed and evaluated through cell proliferation methods, Oil-Red-O staining, and specific marker expression. Chromatin immunoprecipitation (ChIP) assay was performed to confirm cyclin G2 (CCNG2) as a direct target gene of FoxO6. Key findings: FoxO6 is ubiquitously expressed in different chicken tissues and highly expressed in liver, abdominal fat, and preadipocytes in cultured cell. FoxO6 overexpression decreased preadipocyte proliferation by causing G1-phase cell-cycle arrest, whereas inhibition of FoxO6 showed the opposite effects. Overexpression or knock-down of FoxO6 significantly altered the mRNA and protein levels of cell-cycle related markers, such as CCNG2, cyclin dependent kinase inhibitor 1B (CDKN1B), cyclin dependent kinase inhibitor 1A (CDKN1A) and cyclin D2 (CCND2). During preadipocyte proliferation, FoxO6 targets and induces expression of CCNG2, as confirmed by ChIP assay and qPCR. In addition, FoxO6 induces preadipocyte apoptosis through increasing the protein expression levels of cleaved caspase-3 and cleaved caspase-8. Moreover, FoxO6 at the early stage of adipogenesis suppressed mRNA and protein levels of the key early regulators of adipogenesis, such as PPAR gamma and C/EBP alpha. Significance: The results demonstrate that FoxO6 controls preadipocyte proliferation, apoptosis and early adipogenesis, and point to new approaches for further studies related to obesity.

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