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American Journal of Pathology, Vol 145, 167-174, Copyright © 1994 by American Society for Investigative Pathology

REGULAR ARTICLES

Differential expression of extracellular matrix molecules and the alpha 6-integrins in the normal and neoplastic prostate

JD Knox, AE Cress, V Clark, L Manriquez, KS Affinito, BL Dalkin and RB Nagle
Department of Pathology, College of Medicine, University of Arizona, Tucson 85724.

The epithelial basal lamina composition and integrin expression profile of normal and neoplastic human prostate was characterized using immunohistochemical analysis of frozen samples. The major components of the basal lamina surrounding normal acini were laminin, type IV collagen, entactin, and type VII collagen with variable amounts of tenascin. The basal lamina of neoplastic acini had a similar composition, except for the loss of type VII collagen, which was observed in all grades of carcinoma. The basal cells of the normal prostate express the alpha 6-, beta 1-, and beta 4-integrin subunits, suggesting that both the alpha 6 beta 1- and alpha 6 beta 4-integrin complexes are formed. In prostate carcinoma there is a complete loss of beta 4 expression and the alpha 6- and beta 1-integrin subunits, which are restricted to the basal and basal lateral surfaces of basal cells, are distributed diffusely throughout the cytoplasmic membrane. The differential expression of type VII collagen and beta 4 are discussed in relationship to their possible role in tumor progression.


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Copyright © 1994 by the American Society for Investigative Pathology.