Hypoxia activates the hedgehog signaling pathway in a ligand-independent manner by upregulation of Smo transcription in pancreatic cancer

Hideya Ohnishi, Masaya Kai, Seiichi Odate, Hironori Iwasaki, Yoshihiro Morifuji, Toshitatsu Ogino, Takafumi Morisaki, Yutaka Nakashima, Mitsuo Katano

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

The hedgehog (Hh) signaling pathway is activated in various types of cancer including pancreatic ductal adenocarcinoma. It has been shown that extremely low oxygen tension (below 1% O2) is found in tumor tissue including pancreatic ductal adenocarcinoma cells (PDAC) and increases the invasiveness of PDAC. To investigate the contribution of the Hh pathway to hypoxia-induced invasiveness, we examined how hypoxia affects Hh pathway activation and the invasiveness of PDAC. In the present study, three human PDAC lines were cultured under normoxic (20% O2) or hypoxic (1% O2) conditions. Hypoxia upregulated the transcription of Sonic hedgehog (Shh), Smoothened (Smo), Gli1 and matrix metalloproteinase9 (MMP9) and increased the invasiveness of PDAC. Significantly, neither the addition of recombinant Shh (rhShh) nor the silencing of Shh affected the transcription of these genes and the invasiveness of PDAC. On the other hand, silencing of Smo decreased the transcription of Gli1 and MMP9 and PDAC invasiveness. Silencing of Gli1 or MMP9 decreased PDAC invasiveness. These results suggest that hypoxia activates the Hh pathway of PDAC by increasing the transcription of Smo in a ligand-independent manner and increases PDAC invasiveness.

Original languageEnglish
Pages (from-to)1144-1150
Number of pages7
JournalCancer Science
Volume102
Issue number6
DOIs
Publication statusPublished - Jun 1 2011

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Pancreatic Neoplasms
Adenocarcinoma
Up-Regulation
Ligands
Hypoxia
Oxygen
Cell Line

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

Cite this

Hypoxia activates the hedgehog signaling pathway in a ligand-independent manner by upregulation of Smo transcription in pancreatic cancer. / Ohnishi, Hideya; Kai, Masaya; Odate, Seiichi; Iwasaki, Hironori; Morifuji, Yoshihiro; Ogino, Toshitatsu; Morisaki, Takafumi; Nakashima, Yutaka; Katano, Mitsuo.

In: Cancer Science, Vol. 102, No. 6, 01.06.2011, p. 1144-1150.

Research output: Contribution to journalArticle

Ohnishi, Hideya ; Kai, Masaya ; Odate, Seiichi ; Iwasaki, Hironori ; Morifuji, Yoshihiro ; Ogino, Toshitatsu ; Morisaki, Takafumi ; Nakashima, Yutaka ; Katano, Mitsuo. / Hypoxia activates the hedgehog signaling pathway in a ligand-independent manner by upregulation of Smo transcription in pancreatic cancer. In: Cancer Science. 2011 ; Vol. 102, No. 6. pp. 1144-1150.
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