Activation of the sonic hedgehog signaling controls human pulmonary arterial smooth muscle cell proliferation in response to hypoxia

Guansong Wang, Zhiyuan Zhang, Zhi Xu, Hongjin Yin, Li Bai, Zhuang Ma, Mark A. DeCoster, Guisheng Qian, Guangyu Wu

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The hedgehog signal pathway plays a crucial role in the angiogenesis and vascular remodeling. However, the function of this pathway in the pulmonary vascular smooth cell proliferation in response to hypoxia remains unknown. In this study, we have demonstrated that the main components of the hedgehog pathway, including sonic hedgehog (SHH), patched1 (PTCH1), smoothened (SMO), GLI and hypoxia-inducible factor 1 (HIF1) are expressed in the human pulmonary arterial smooth muscle cells (HPASMCs). Interestingly, hypoxia significantly enhanced the expression of SHH and HIF1, facilitated the translocation of GLI1 into the nuclei, and promoted the proliferation of HPASMCs. Furthermore, direct activation of the SHH pathway through incubation with the purified recombinant human SHH or with purmorphamine and SAG, two Smo agonists, also enhanced the proliferation of HPASMCs. Importantly, the treatment with anti-SHH and anti-HIF1 antibodies or cyclopamine, a specific SMO inhibitor, markedly inhibited the nuclear translocation of GLI1 and cell proliferation in the HPASMCs induced by hypoxia and activation of the SHH pathway. Moreover, the treatment with cyclopamine increased apoptosis in the hypoxic HPASMCs. These data strongly demonstrate for the first time that the SHH signaling plays a crucial role in the regulation of HPASMC growth in response to hypoxia.

Original languageEnglish (US)
Pages (from-to)1359-1367
Number of pages9
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1803
Issue number12
DOIs
StatePublished - Dec 2010

Keywords

  • Anoxia
  • Cell proliferation
  • GLI
  • Hedgehog signal pathway
  • Human pulmonary arterial smooth muscle cells
  • Sonic hedgehog

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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