Heat shock factor Hsf1 cooperates with ErbB2 (Her2/Neu) protein to promote mammary tumorigenesis and metastasis

Caixia Xi, Yanzhong Hu, Phillip Buckhaults, Dimitrios Moskofidis, Nahid F Mivechi

Research output: Contribution to journalArticle

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Abstract

ErbB2/Neu oncogene is overexpressed in 25% of invasive/metastatic breast cancers. We have found that deletion of heat shock factor Hsf1 in mice overexpressing ErbB2/Neu significantly reduces mammary tumorigenesis and metastasis. Hsf1+/-ErbB2/Neu+ tumors exhibit reduced cellular proliferative and invasive properties associated with reduced activated ERK1/2 and reduced epithelial-mesenchymal transition (EMT). Hsf1 +/+Neu+ mammary epithelial cells exposed to TGFβ show high levels of ERK1/2 activity and EMT; this is associated with reduced expression of E-cadherin and increased expression of Slug and vimentin, a mesenchymal marker. In contrast, Hsf1-/-Neu+ or Hsf1 +/+Neu+ cells do not exhibit activated ERK1/2 and show reduced EMT in the presence of TGFβ. The ineffective activation of the RAS/RAF/MEK/ERK1/2 signaling pathway in cells with reduced levels of HSF1 is due to the low levels of HSP90 in complex with RAF1 that are required for RAF1 stability and maturation. These results indicate a powerful inhibitory effect conferred by HSF1 downstream target genes in the inhibition of ErbB2-induced breast cancers in the absence of the Hsf1 gene.

Original languageEnglish (US)
Pages (from-to)35646-35657
Number of pages12
JournalJournal of Biological Chemistry
Volume287
Issue number42
DOIs
StatePublished - Oct 12 2012

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Epithelial-Mesenchymal Transition
Shock
Carcinogenesis
Breast
Hot Temperature
Genes
Neoplasm Metastasis
Mitogen-Activated Protein Kinase Kinases
Vimentin
Cadherins
Breast Neoplasms
Tumors
Proteins
Gastropoda
MAP Kinase Signaling System
Chemical activation
Oncogenes
Epithelial Cells
Neoplasms

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Heat shock factor Hsf1 cooperates with ErbB2 (Her2/Neu) protein to promote mammary tumorigenesis and metastasis. / Xi, Caixia; Hu, Yanzhong; Buckhaults, Phillip; Moskofidis, Dimitrios; Mivechi, Nahid F.

In: Journal of Biological Chemistry, Vol. 287, No. 42, 12.10.2012, p. 35646-35657.

Research output: Contribution to journalArticle

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