The Ubiquitin Ligase SIAH2 Negatively Regulates Glucocorticoid Receptor Activity and Abundance.

The Ubiquitin Ligase SIAH2 Negatively Regulates Glucocorticoid Receptor Activity and Abundance.
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DOI:
10.3390/biomedicines9010022
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发表时间:
2020-12-30
期刊:
影响因子:
4.7
通讯作者:
Collier JJ
Collier JJ
中科院分区:
工程技术3区
文献类型:
--
作者:
Burke SJ;Taylor JL;Batdorf HM;Noland RC;Burk DH;Yu Y;Floyd ZE;Collier JJ

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糖皮质激素是临床上常规用于控制炎症的基本药物。然而,许多代谢副作用在使用超过几天后表现出来。在本研究中,我们验证了一种假说,即七缺失哺乳动物同源物-2 (SIAH2),一种调节脂肪形成的泛素连接酶,对控制脂肪细胞大小、炎症和脂肪组织在糖皮质激素刺激下扩张的能力很重要。在SIAH2缺失的小鼠中,我们发现在SIAH2缺失的情况下,脂肪细胞对糖皮质激素的反应更大。此外,SIAH2调节糖皮质激素受体(GR)转录活性和GR总蛋白丰度。此外,这些研究表明,在缺乏SIAH2的情况下,糖皮质激素对白色脂肪组织中纤维化和炎症信号通路相关基因的表达增加。总之,这是首次发现SIAH2在调节GR的转录活性和丰度方面的作用,而GR在体内暴露于糖皮质激素时,会导致脂肪组织大小和基因表达的改变。
Glucocorticoids are clinically essential drugs used routinely to control inflammation. However, a host of metabolic side effects manifests upon usage beyond a few days. In the present study, we tested the hypothesis that seven-in-absentia mammalian homolog-2 (SIAH2), a ubiquitin ligase that regulates adipogenesis, is important for controlling adipocyte size, inflammation, and the ability of adipose tissue to expand in response to a glucocorticoid challenge. Using mice with global deletion of SIAH2 exposed or not to corticosterone, we found that adipocytes are larger in response to glucocorticoids in the absence of SIAH2. In addition, SIAH2 regulates glucocorticoid receptor (GR) transcriptional activity and total GR protein abundance. Moreover, these studies reveal that there is an increased expression of genes involved in fibrosis and inflammatory signaling pathways found in white adipose tissue in response to glucocorticoids in the absence of SIAH2. In summary, this is the first study to identify a role for SIAH2 to regulate transcriptional activity and abundance of the GR, which leads to alterations in adipose tissue size and gene expression during in vivo exposure to glucocorticoids.
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