Angiogenic factors expressed by human prostatic cell lines: effect on endothelial cell growth in vitro

Antiangiogenic therapy for prostatic cancer should offer additional ways of combating tumor progression. Knowledge of the possible angiogenic factors expressed by prostate cancer cell lines would therefore assist in the design and testing of such potential treatments.

Changes in the proliferation and morphology of several endothelial cell lines (BAEC, HUVEC, and BACE) in response to either coculturing with human prostatic cell lines or culturing with conditioned medium derived from these lines were assessed.

Proliferation of BAEC cells was significantly stimulated by conditioned media from DU145, LNCaP, and DuPro-1, and also by coculture with LNCaP and DuPro-1. Growth of HUVEC cells was significantly increased with conditioned media from LNCaP, Ten12, and PC3, and by coculture with DU145 and DuPro-1. FGF2 supplementation is required for BACE growth in vitro, and only conditioned medium from Ten12 cells, which produce the highest levels of this growth factor, significantly increased cell numbers. BACE growth, however, was stimulated in coculture experiments with DU145, DuPro-1, PC3, and LNCaP. Morphological changes were only observed in the BAEC and BACE cells when cultured with conditioned media.

Prostatic carcinoma cell lines express a variety of angiogenic substances, including FGF2, which can stimulate endothelial cell proliferation in vitro, but this response may be modified by the prostatic-cell expression of other factors such as TGF alpha and TGF beta.