Inhibition of prostatic epithelial cell proliferation by a factor secreted specifically by prostatic stromal cells.
Stromal cells from the prostate were recently shown to inhibit clonal growth of the prostatic carcinoma cell lines PC-3 (hormone-independent) and LNCaP (hormone-sensitive) in coculture. Our study revealed that stromal cell-conditioned medium strongly inhibited proliferation of PC-3 and LNCaP cells when grown in monolayer culture. Antiproliferative activity was found to be reversible, and was produced specifically by prostatic stromal cells and not by stromal cells derived from skin, foreskin, uterus, kidney, and Wilms' tumor. Inhibition was not species-specific, since the cell lines AT-2.1 and MATLyLu, derived from the Dunning rat prostate tumor, were also sensitive. No inhibition, however, occurred on breast and renal carcinoma cell lines, suggesting a prostate-specific action. The putative inhibiting factor(s) could be concentrated and partially purified by ammonium sulfate precipitation. The possible role in stromal control of epithelial cell proliferation is discussed.
Kooistra
A
A
Department of Urology, Erasmus University/Academic Hospital Rotterdam, The Netherlands.
König
J J
JJ
Keizer
D M
DM
Romijn
J C
JC
Schröder
F H
FH
D000818:Animals; D001943:Breast Neoplasms / Q000473:pathology; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D017077:Culture Media, Conditioned; D004305:Dose-Response Relationship, Drug; D004848:Epithelium / Q000187:drug effects / Q000473:pathology; D006131:Growth Inhibitors / Q000096:biosynthesis* / Q000494:pharmacology*; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology; D008297:Male; D011467:Prostate / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology*; D011471:Prostatic Neoplasms / Q000473:pathology*; D051381:Rats; D013045:Species Specificity; D017154:Stromal Cells / Q000166:cytology / Q000378:metabolism; D014407:Tumor Cells, Cultured
D017077:Culture Media, Conditioned; D006131:Growth Inhibitors