Schnurri-2 controls BMP-dependent adipogenesis via interaction with Smad proteins

Schnurri-2 controls BMP-dependent adipogenesis via interaction with Smad proteins
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DOI:
10.1016/j.devcel.2006.02.016
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发表时间:
2006-04-01
期刊:
影响因子:
11.8
通讯作者:
Ishii, S
Ishii, S
中科院分区:
生物学1区
文献类型:
--
作者:
Jin, WZ;Takagi, T;Ishii, S

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脂肪细胞分化是肥胖的重要组成部分,但激素信号如何介导脂肪细胞分化仍然难以捉摸。 BMP 在体外刺激脂肪细胞分化,但 BMP 在体内脂肪生成中的作用尚不清楚。果蝇 Schnurri (Shn) 通过与 Mad/Medea 转录因子相互作用,是果蝇 BMP 同源物 Decapentaplegic 信号传导所必需的。脊椎动物有 3 个 Shn 直系同源物:Shn-1、-2 和 -3。在这里,我们报道Shn-2(-/-)小鼠白色脂肪组织减少,并且Shn-2(-/-)小鼠胚胎成纤维细胞不能在体外有效分化为脂肪细胞。 Shn-2 在 BMP-2 刺激下进入细胞核,并与 Smad1/4 和 C/EBP α 配合,诱导 PPAR γ 2(脂肪细胞分化的关键转录因子)的表达。 Shn-2 直接与 PPAR gamma 2 启动子上的 Smad1/4 和 C/EBP α 相互作用。这些结果表明,Shn-2 介导的 BMP 信号传导在脂肪生成中具有关键作用。
Adipocyte differentiation is an important component of obesity, but how hormonal cues mediate adipocyte differentiation remains elusive. BMP stimulates in vitro adipocyte differentiation, but the role of BMP in adipogenesis in vivo is unknown. Drosophila Schnurri (Shn) is required for the signaling of Decapentaplegic, a Drosophila BMP homolog, via interaction with the Mad/Medea transcription factors. Vertebrates have three Shn orthologs, Shn-1, -2, and -3. Here, we report that Shn-2(-/-) mice have reduced white adipose tissue and that Shn-2(-/-) mouse embryonic fibroblasts cannot efficiently differentiate into adipocytes in vitro. Shn-2 enters the nucleus upon BMP-2 stimulation and, in cooperation with Smad1/4 and C/EBP alpha, induces the expression of PPAR gamma 2, a key transcription factor for adipocyte differentiation. Shn-2 directly interacts with both Smad1/4 and C/EBP alpha on the PPAR gamma 2 promoter. These results indicate that Shn-2-mediated BMP signaling has a critical role in adipogenesis.