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KGF suppresses alpha(2)beta(1) integrin function and promotes differentiation of the transient amplifying population in human prostatic epithelium

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JournalJournal of Cell Science
DatePublished - 1 Apr 2006
Issue number7
Volume119
Number of pages9
Pages (from-to)1416-1424
Original languageEnglish

Abstract

Prostate epithelial stem cells are self-renewing cells capable of differentiation into prostate epithelium, and are thought to contribute towards both benign and malignant conditions in the human prostate. We have previously demonstrated that prostate epithelial basal cells express high levels of integrin alpha(2)beta(1) and this population can be subdivided into stem (alpha(2)beta(hi)(1) CD133(+)) and transient-amplifying population (TAP) cells (alpha(2)beta(hi)(1) CD133(-)). However, the molecular mechanism(s) controlling the commitment and regulation of these cells towards differentiated epithelium remains unclear. Here, we demonstrate that beta(1) integrin function is required for the maintenance of basal prostatic epithelial cells and suppression of its function by either methylcellulose or, more specifically, beta(1)-blocking antibody (80 mu g/ml) induces differentiation, with associated expression of the differentiation-specific markers prostate acid phosphatase (PAP) and cytokeratin 18 (CK18). Keratinocyte growth factor (KGF), a stromal-derived growth factor, has previously been implicated in prostate organogenesis using in vitro tissue recombination experiments. We show that treatment with KGF (10 ng/ml) potently induces epithelial differentiation with concomitant suppression of alpha(2)beta(1) integrin expression as well as the induction of androgen receptor expression. Specifically, p38-MAPK appears to be involved and the presence of SB202190, a p38 inhibitor, significantly blocks KGF-induced differentiation. Furthermore, the expression of the high-affinity receptor tyrosine kinase to KGF (FGFR2) is predominantly detectable in alpha(2)beta(hi)(1) CD133(-) TAP cells when compared with stem cells (alpha(2)beta(hi)(1) CD133+), which would therefore be relatively unresponsive to the differentiating effect of KGF. Taken together, using a human primary culture model, we have demonstrated key roles for interactions between KGF and integrin-mediated function in the regulation of prostate epithelial differentiation.

    Research areas

  • stem cells, transient amplifying cells, prostate, epithelia, beta(1) integrin, p38, KGF, KERATINOCYTE GROWTH-FACTOR, SEMINAL-VESICLE MESENCHYME, PROTEIN-KINASE PATHWAY, RAT VENTRAL PROSTATE, STEM-CELLS, ANDROGEN RECEPTOR, TERMINAL DIFFERENTIATION, BRANCHING MORPHOGENESIS, BASAL-CELLS, CANCER

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