Date of Award


Degree Type


University or Center

Clark Atlanta University(CAU)

Degree Name


Biological Sciences

First Advisor

Dr. Shafiq Khan


Transforming growth factor-beta (TGF-β) has a variety of roles including cell growth inhibition, stimulation of proliferation, differentiation, apoptosis and extracellular matrix (ECM) formation. TGF-β inhibits growth of the epithelial cells in the prostate gland. The ability of TGF-β to inhibit cell growth enables it to act as a potent tumor suppressor. Here, we show that TGF-β has different effects on proliferation in DU145 (TGF-β- responsive) and PC3M (TGF-β - resistant) prostate cancer cell lines. RT-PCR analysis and Real-time PCR data have determined the varying levels of AP-1 family members in both cell lines. In PC3M and DU145 cells, we have shown that TGF-p exerts opposite effects on JunD, cFos and Fra2 expression, suggesting that AP-1 family members may be involved in the differential effects of TGF-β in these cell lines. The present observation confirms an intact inhibitory role of TGF-β on proliferation in DU145 cells, and shows a non-inhibitory function in PC3M cell growth. In PC3M cells TGF-β may exert effects leading to the metastatic nature of this cell line.

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