Hypoxia-inducible factor 1 mediates TAZ expression and nuclear localization to induce the breast cancer stem cell phenotype

Lisha Xiang, Daniele M. Gilkes, Hongxia Hu, Naoharu Takano, Weibo Luo, Haiquan Lu, John W. Bullen, Debangshu Samanta, Houjie Liang, Gregg L. Semenza

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Intratumoral hypoxia, which is associated with breast cancer metastasis and patient mortality, increases the percentage of breast cancer stem cells (BCSCs) but the underlying molecular mechanisms have not been delineated. Here we report that hypoxia-inducible factor 1 (HIF-1) triggers the expression and activity of TAZ, a transcriptional co-activator that is required for BCSC maintenance, through two discrete mechanisms. First, HIF-1 binds directly to the WWTR1 gene and activates transcription of TAZ mRNA. Second, HIF-1 activates transcription of the SIAH1 gene, which encodes a ubiquitin protein ligase that is required for the hypoxia-induced ubiquitination and proteasome-dependent degradation of LATS2, a kinase that inhibits the nuclear localization of TAZ. Inhibition of HIF-1α, TAZ, or SIAH1 expression by short hairpin RNA blocked the enrichment of BCSCs in response to hypoxia. Human breast cancer database analysis revealed that increased expression (greater than the median) of both TAZ and HIF-1 target genes, but neither one alone, is associated with significantly increased patient mortality. Taken together, these results establish a molecular mechanism for induction of the BCSC phenotype in response to hypoxia.

Original languageEnglish (US)
Pages (from-to)12509-12527
Number of pages19
JournalOncotarget
Volume5
Issue number24
StatePublished - Jan 1 2014

Fingerprint

Hypoxia-Inducible Factor 1
Neoplastic Stem Cells
Breast Neoplasms
Phenotype
Genes
Ubiquitin-Protein Ligases
Mortality
Ubiquitination
Proteasome Endopeptidase Complex
Small Interfering RNA
Phosphotransferases
Maintenance
Databases
Neoplasm Metastasis
Messenger RNA
Hypoxia

Keywords

  • Aldefluor assay
  • Basal-like breast cancer
  • Mammospheres
  • Targeted therapy
  • Triple-negative breast cancer

ASJC Scopus subject areas

  • Oncology

Cite this

Xiang, L., Gilkes, D. M., Hu, H., Takano, N., Luo, W., Lu, H., ... Semenza, G. L. (2014). Hypoxia-inducible factor 1 mediates TAZ expression and nuclear localization to induce the breast cancer stem cell phenotype. Oncotarget, 5(24), 12509-12527.

Hypoxia-inducible factor 1 mediates TAZ expression and nuclear localization to induce the breast cancer stem cell phenotype. / Xiang, Lisha; Gilkes, Daniele M.; Hu, Hongxia; Takano, Naoharu; Luo, Weibo; Lu, Haiquan; Bullen, John W.; Samanta, Debangshu; Liang, Houjie; Semenza, Gregg L.

In: Oncotarget, Vol. 5, No. 24, 01.01.2014, p. 12509-12527.

Research output: Contribution to journalArticle

Xiang, L, Gilkes, DM, Hu, H, Takano, N, Luo, W, Lu, H, Bullen, JW, Samanta, D, Liang, H & Semenza, GL 2014, 'Hypoxia-inducible factor 1 mediates TAZ expression and nuclear localization to induce the breast cancer stem cell phenotype', Oncotarget, vol. 5, no. 24, pp. 12509-12527.
Xiang, Lisha ; Gilkes, Daniele M. ; Hu, Hongxia ; Takano, Naoharu ; Luo, Weibo ; Lu, Haiquan ; Bullen, John W. ; Samanta, Debangshu ; Liang, Houjie ; Semenza, Gregg L. / Hypoxia-inducible factor 1 mediates TAZ expression and nuclear localization to induce the breast cancer stem cell phenotype. In: Oncotarget. 2014 ; Vol. 5, No. 24. pp. 12509-12527.
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