Preferential production of latent transforming growth factor beta-2 by primary prostatic epithelial cells and its activation by prostate-specific antigen.

Abstract:

:Three mammalian isoforms of transforming growth factor-beta (TGFbeta) are known, TGFbeta1, 2, and 3, that have non-overlapping functions during development. However, their specific roles in cancers such as prostate cancer are less clear. Here we show that primary cultures of prostatic epithelial cells preferentially produce and activate the latent TGFbeta2 isoform. Paired cultures of normal and malignant prostate cells from prostate cancer patients produced predominantly the TGFbeta2 isoform, with 30- to 70-fold less TGFbeta1. By mono-Q ion exchange chromatography, three major peaks of latent TGFbeta2 activity were observed corresponding to the known small latent TGFbeta2 complex, the known large latent TGFbeta2 complex and a novel eluting peak of latent TGFbeta2. Although prostate cells are known to activate latent TGFbeta, the mechanism for activation is currently unclear. We investigated whether prostate specific antigen (PSA), a serine protease used as a clinical marker for prostate cancer, could play a role in the activation of latent TGFbeta. Unlike plasmin, a known activator of both latent TGFbeta1 and 2, PSA specifically activated the recombinant small latent form of TGFbeta2, but not TGFbeta1. Prostate epithelial cells, therefore, preferentially produce the TGFbeta2 isoform and PSA, a protease produced by the prostate, specifically targets the activation of this TGFbeta isoform. PSA-mediated activation of latent TGFbeta2 may be an important mechanism for autocrine TGFbeta regulation in the prostate and may potentially contribute to the formation of osteoblastic lesions in bone metastatic prostate cancer.

journal_name

J Cell Physiol

authors

Dallas SL,Zhao S,Cramer SD,Chen Z,Peehl DM,Bonewald LF

doi

10.1002/jcp.20147

keywords:

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

361-70

issue

2

eissn

0021-9541

issn

1097-4652

journal_volume

202

pub_type

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