An Id-like molecule, HHM, is a synexpression group-restricted regulator of TGF-beta signalling.

An Id-like molecule, HHM, is a synexpression group-restricted regulator of TGF-beta signalling.
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ID样分子HHM是TGF-β信号传导的Synexpression群体限制调节剂。

DOI:
10.1038/emboj.2008.218
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发表时间:
2008-11-19
期刊:
影响因子:
11.4
通讯作者:
Miyazono, Kohei
Miyazono, Kohei
中科院分区:
生物学1区
文献类型:
--
作者:
Ikushima, Hiroaki;Komuro, Akiyoshi;Isogaya, Kazunobu;Shinozaki, Masahiko;Hellman, Ulf;Miyazawa, Keiji;Miyazono, Kohei

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转化生长因子(TGF)-β主要通过smad依赖性转录调控诱导多种细胞反应。活化的Smad复合物与转录因子协同调节一组靶基因。由同一smad -辅因子复合物控制的靶基因称为共表达组。我们发现Id-like helix-loop-helix蛋白,Maid的人类同源物(HHM)是TGF-β信号的协同表达组限制性调节剂。HHM能抑制TGF-β诱导的生长抑制和细胞迁移,但不能抑制上皮-间质转化。此外,HHM能抑制TGF-β诱导的纤溶酶原激活物抑制剂1型(PAI-1)、PDGF-B和p21WAF的表达,但对Snail无抑制作用。我们确定了一个碱性螺旋-环-螺旋蛋白Olig1,作为受HHM影响的smad结合转录因子之一。Olig1在TGF-β刺激下与Smad2/3相互作用,并参与PAI-1和PDGF-B的转录激活。HHM通过与Olig1的物理相互作用抑制TGF-β信号依赖性的Olig1与Smad2/3的关联,而非Id蛋白。因此,HHM似乎调节TGF-β靶基因的一个子集,包括Olig1-Smad协同表达组。HHM是TGF-β信号传导的细胞反应选择性调节剂的第一个例子,其机制已经明确。
Transforming growth factor (TGF)-β induces various cellular responses principally through Smad-dependent transcriptional regulation. Activated Smad complexes cooperate with transcription factors in regulating a group of target genes. The target genes controlled by the same Smad-cofactor complexes are denoted a synexpression group. We found that an Id-like helix-loop-helix protein, human homologue of Maid (HHM), is a synexpression group-restricted regulator of TGF-β signalling. HHM suppressed TGF-β-induced growth inhibition and cell migration but not epithelial–mesenchymal transition. In addition, HHM inhibited TGF-β-induced expression of plasminogen activator inhibitor-type 1 (PAI-1), PDGF-B, and p21WAF, but not Snail. We identified a basic-helix-loop-helix protein, Olig1, as one of the Smad-binding transcription factors affected by HHM. Olig1 interacted with Smad2/3 in response to TGF-β stimulation, and was involved in transcriptional activation of PAI-1 and PDGF-B. HHM, but not Id proteins, inhibited TGF-β signalling-dependent association of Olig1 with Smad2/3 through physical interaction with Olig1. HHM thus appears to regulate a subset of TGF-β target genes including the Olig1-Smad synexpression group. HHM is the first example of a cellular response-selective regulator of TGF-β signalling with clearly determined mechanisms.
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