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Regulation of Hepatocyte Activator Inhibitor-1 Expression by Androgen and Oncogenic Transformation in the Prostate

Authors
  • Beatrice S. Knudsen
  • Jared M. Lucas
  • Ladan Fazli
  • Sarah Hawley
  • Seth Falcon
  • Ilsa M. Coleman
  • Dan B. Martin
  • Chang Xu
  • Lawrence D. True¶
  • Martin E. Gleave
  • Peter S. Nelson
  • Gustavo E. Ayala
Publisher
American Society for Investigative Pathology
Publication Date
Jul 01, 2005
Source
PMC
Keywords
Disciplines
  • Biology
  • Chemistry
License
Unknown

Abstract

Hepatocyte activator inhibitor-1 (HAI-1) is a transmembrane serine protease inhibitor that regulates the conversion of latent to active hepatocyte growth factor (HGF). Studies supporting a role for the HGF pathway in prostate carcinogenesis prompted an analysis of HAI-1 expression in the prostate. Here we analyze the regulation of HAI-1 expression by androgen, oncogenic transformation, and cancer progression. Immunohistochemical analysis revealed that HAI-1 expression was restricted to prostate epithelium, where staining occurred primarily in basal and atrophic luminal epithelial cells. Compared to normal glands, HAI-1 expression was significantly increased in localized prostate cancer and was present in most prostate cancer metastases. HAI-1 protein expression levels were sensitive to androgen in normal epithelium but not in cancer. Although androgen did not increase HAI-1 protein expression levels in LNCaP cells, it decreased HAI-1 surface expression, consistent with previous data from our group (Martin DB, Gifford DR, Wright ME, Keller A, Yi E, Goodlett DR, Aebersold R, Nelson PS: Quantitative proteomic analysis of proteins released by neoplastic prostate epithelium. Cancer Res 2004, 64:347–355). HAI-1 overexpression in cancer was predictive of prostate-specific antigen recurrence (relative risk, 1.24). These results suggest that HAI-1 regulates the HGF Met axis on prostate epithelial cells and influences HGF mediated tumor invasion and metastasis.

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