Inhibition of Hedgehog signaling pathway impedes cancer cell proliferation by promotion of autophagy.

Inhibition of Hedgehog signaling pathway impedes cancer cell proliferation by promotion of autophagy.
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抑制 Hedgehog 信号通路可通过促进自噬来阻止癌细胞增殖。

DOI:
10.1016/j.ejcb.2015.03.003
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发表时间:
2015-05
期刊:
Eur J Cell Biol
影响因子:
--
通讯作者:
Lu Q
Lu Q
中科院分区:
其他
文献类型:
--
作者:
Gao M;Rao H;Luo S;Lu Q

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多种证据表明,Hedgehog(Hh)信号传导的异常激活与多种人类癌症有关。然而,癌细胞如何响应Hh抑制的分子机制仍有待阐明。在这项研究中,我们发现Hh信号的阻断抑制了人类癌细胞的细胞增殖。基因芯片分析显示,人类癌细胞中的差异表达基因(DEG)在自噬通路中富集,以响应Hh信号的抑制。有趣的是,抑制Hh信号传导诱导自噬,而通过配体处理激活Hh信号传导阻止自噬的诱导。此外,3-甲基腺嘌呤(3-MA)抑制自噬部分抑制Hh信号抑制诱导的细胞毒性。最后,在自噬缺陷细胞中,由抑制Hh信号传导引发的细胞毒性效应被部分逆转,表明Hh信号传导对自噬的调节是自噬特异性的。这些结果表明Hh信号传导的抑制部分地通过诱导自噬来阻碍癌细胞增殖。
Multiple lines of evidence implicate that aberrant activation of Hedgehog (Hh) signaling is involved in a variety of human cancers. However, the molecular mechanisms underlying how cancer cells respond to Hh inhibition remain to be elucidated. In this study, we found that blockade of Hh signaling suppresses cell proliferation in human cancer cells. Microarray analysis revealed that differentially expressed genes (DEGs) in human cancer cells are enriched in autophagy pathway in response to the inhibition of Hh signaling. Interestingly, inhibition of Hh signaling induced autophagy, whereas activation of Hh signaling by ligand treatments prevented the induction of autophagy. In addition, inhibition of autophagy by 3-methyladenine (3-MA) partially suppressed cytotoxicity induced by inhibition of Hh signaling. Finally, in autophagy deficient cells, cytotoxic effect triggered by inhibition of Hh signaling was partially reversed, indicating the modulation of autophagy by Hh signaling is autophagy-specific. These results suggest that inhibition of Hh signaling impedes cancer cell proliferation in part through induction of autophagy.
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