ETV5 regulates GOAT/ghrelin system in an mTORC1-dependent manner

ETV5 regulates GOAT/ghrelin system in an mTORC1-dependent manner
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ETV5 以 mTORC1 依赖性方式调节 GOAT/ghrelin 系统

DOI:
10.1016/j.mce.2019.02.003
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发表时间:
2019-04
影响因子:
4.1
通讯作者:
Zhang Weizhen
Zhang Weizhen
中科院分区:
医学2区
文献类型:
--
作者:
Mao Zhuo;Yang Qing;Yin Wenzhen;Su Wen;Lin Hui;Feng Mingji;Pan Ke;Yin Yue;Zhang Weizhen

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Ghrelin 是一种由 28 个氨基酸组成的肽激素,调节多种重要的代谢功能。它被生长素释放肽-O-酰基转移酶 (GOAT) 酰化,是结合并激活其受体(生长激素促分泌素受体 1a)所必需的。 GOAT 和酰基生长素释放肽的调节机制仍不清楚。本研究表明,ETV5 可以反式激活 GOAT 启动子区域并增加其表达,从而导致酰基生长素释放肽的产生随后增加。 mTORC1 可能通过改变小鼠下丘脑 CLU122 细胞和小鼠中的蛋白质稳定性来调节 ETV5 表达水平。此外,ETV5 介导 mTORC1 信号传导对酰基 ghrelin 表达水平的影响。我们的研究表明,在 ghrelin 系统的调节中存在一种新的 mTORC1-ETV5-GOAT/ghrelin 轴。 ETV5 可能是 ghrelin 产生细胞中 mTORC1-GOAT/ghrelin 轴的关键调节因子,也是机体能量失衡的潜在治疗靶点。
Ghrelin, a 28 amino acid peptide hormone, regulates multiple important metabolic functions. Its acylation by ghrelin-O-acyl-transferase enzyme (GOAT) is required for binding to and activating its receptor, the growth hormone secretagogue receptor 1a. Mechanism underlying the regulation of GOAT and acyl ghrelin remains unclear. The present study demonstrated that ETV5 could transactivate GOAT promoter region and increase its expression, leading to subsequent increase in the production of acyl ghrelin. mTORC1 modulated ETV5 expression levels, likely via altering its protein stability, in the murine hypothalamic CLU122 cells and in mice. Moreover, ETV5 mediated the effects of mTORC1 signaling on the expression level of acyl ghrelin. Our study suggests a novel mTORC1-ETV5-GOAT/ghrelin axis in the regulation of ghrelin system. ETV5 may be a key regulator of mTORC1-GOAT/ghrelin axis in ghrelin producing cells and a potential therapeutic target for organism energy imbalance.
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