Type I collagen receptor (alpha2beta1) signaling promotes prostate cancer invasion through RhoC GTPase.

Abstract:

:The most frequent site of metastasis in human prostate cancer (PCa) is the bone. Preferential adhesion of PCa cells to bone-specific factors may facilitate the selective metastasis of the skeleton. The most abundant protein within the skeleton is type I collagen. We previously demonstrated that PCa cells selected in vitro for collagen I binding (LNCaP(col)) are highly motile and acquired the capacity to grow within the bone compared to nontumorigenic LNCaP parental cells. Treatment with alpha(2)beta(1)-neutralizing antibodies selectively blocked collagen-stimulated migration, suggesting that integrin signaling mediates PCa migration. To elucidate the mechanism of collagen-stimulated migration, we evaluated integrin-associated signaling pathways in non-collagen-binding LNCaP parental cells and in collagen-binding isogenic C4-2B and LNCaP(col) PCa cells. The expression and activity of RhoC guanosine triphosphatase was increased five- to eightfold in collagen-binding LNCaP(col) and C4-2B cells, respectively, compared to parental LNCaP cells. RhoC activation was selectively blocked with antibodies to alpha(2)beta(1) where treatment with a small hairpin RNA specific for RhoC suppressed collagen-mediated invasion without altering the PCa cells' affinity for collagen I. We conclude that the ligation of alpha(2)beta(1) by collagen I activates RhoC guanosine triphosphatase, which mediates PCa invasion, and suggests a mechanism for the preferential metastasis of PCa cells within the bone.

journal_name

Neoplasia

authors

Hall CL,Dubyk CW,Riesenberger TA,Shein D,Keller ET,van Golen KL

doi

10.1593/neo.08380

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

797-803

issue

8

eissn

1522-8002

issn

1476-5586

journal_volume

10

pub_type

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