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. 1996 Sep;149(3):765–773.

Down-regulation of beta 1C integrin, an inhibitor of cell proliferation, in prostate carcinoma.

M Fornaro 1, G Tallini 1, C J Bofetiado 1, S Bosari 1, L R Languino 1
PMCID: PMC1865133  PMID: 8780381

Abstract

The beta 1C integrin, a member of the cell adhesion receptor superfamily, is an alternatively spliced variant of the beta 1A subunit and, in contrast to its wild-type counterpart, inhibits cell proliferation in vitro. The expression of beta 1C integrin in tumor cell growth was investigated. In benign and neoplastic human prostate tissues, immunohistochemical analysis performed using affinity-purified antibodies specific for beta 1C demonstrated a predominant epithelial expression of beta 1C in benign prostate glands with marked staining of the apical, basal, and lateral surfaces. In the adjacent prostate adenocarcinoma glands, the beta 1C variant was dramatically down-regulated in 27 of 34 (79%) analyzed cases, whereas the expression and distribution of its wild-type counterpart, beta 1A, remained unchanged. Tumors exhibiting different Gleason's patterns showed that beta 1C was down-regulated in comparison with the benign tissue regardless of the histological grade. Immunoblotting analysis, using affinity-purified antibodies specific for beta 1C, was performed, in a quantitative manner, to compare beta 1C expression in benign and tumor prostate tissue. The results showed that beta 1C was expressed in benign prostate tissue whereas it was undetectable in prostate adenocarcinoma. Taken together, these data show that beta 1C integrin down-regulation in prostate tissues correlates with a neoplastic phenotype consistent with its in vitro growth-inhibitory properties. These findings indicate a novel pathophysiological role for this integrin variant in tumorigenesis.

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Selected References

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