MET is required for the maximal action of 20-hydroxyecdysone during Bombyx metamorphosis.

MET is required for the maximal action of 20-hydroxyecdysone during Bombyx metamorphosis.
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MET 是家蚕变态过程中 20-羟基蜕皮激素发挥最大作用所必需的

DOI:
10.1371/journal.pone.0053256
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Li S
Li S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guo E;He Q;Liu S;Tian L;Sheng Z;Peng Q;Guan J;Shi M;Li K;Gilbert LI;Wang J;Cao Y;Li S

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关于假定的保幼激素(JH)受体(bHLH-PAS转录因子MET)如何参与20-羟基蜕皮激素(20 E;蜕皮激素)的作用知之甚少。在这里,我们报告,两个MET蛋白在家蚕,家蚕,参与20 E信号转导。Met是20 E响应性的,并且其表达在蜕皮和化蛹期间达到峰值,此时20 E滴度高。如从EcR-USP(蜕皮激素受体基因)的RNAi敲低的结果所发现的,在早期游走阶段的Met的RNAi敲低破坏了20 E触发的转录级联,防止组织重塑(包括幼虫组织的自噬、凋亡和破坏以及成虫结构的产生)并在幼虫-蛹转变期间引起致死性。MET与EcR-USP发生物理相互作用。MET、EcR-USP和20 E反应元件(EcRE)形成蛋白质-DNA复合物,提示MET可能通过与EcR-USP相互作用调节20 E诱导的基因转录。总之,20 E诱导MET是20 E在对虾变态过程中发挥最大作用所必需的。
Little is known about how the putative juvenile hormone (JH) receptor, the bHLH-PAS transcription factor MET, is involved in 20-hydroxyecdysone (20E; the molting hormone) action. Here we report that two MET proteins found in the silkworm, Bombyx mori, participate in 20E signal transduction. Met is 20E responsive and its expression peaks during molting and pupation, when the 20E titer is high. As found with results from RNAi knockdown of EcR-USP (the ecdysone receptor genes), RNAi knockdown of Met at the early wandering stage disrupts the 20E-triggered transcriptional cascade, preventing tissue remodeling (including autophagy, apoptosis and destruction of larval tissues and generation of adult structures) and causing lethality during the larval-pupal transition. MET physically interacts with EcR-USP. Moreover, MET, EcR-USP and the 20E-response element (EcRE) form a protein-DNA complex, implying that MET might modulate 20E-induced gene transcription by interacting with EcR-USP. In conclusion, the 20E induction of MET is required for the maximal action of 20E during Bombyx metamorphosis.
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