Quercetin-induced growth inhibition and cell death in prostatic carcinoma cells (PC-3) are associated with increase in p21 and hypophosphorylated retinoblastoma proteins expression |
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Authors: | MR?Vijayababu P?Kanagaraj A?Arunkumar R?Ilangovan MM?Aruldhas Email author" target="_blank">J?ArunakaranEmail author |
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Institution: | (1) Department of Endocrinology, Dr. ALM Postgraduate Institute of Basic Medical Sciences, University of Madras, Taramani campus, Chennai, 600 113, India |
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Abstract: | Prostate cancer is the major health problem and the leading cause of male cancer death. Quercetin is a novel antitumor and
antioxidant, whose molecular mechanism involved in cell cycle arrest in androgen independent prostate cancer cells remains
unclear. In this study, we investigated the effects of quercetin on proliferation and cell cycle arrest by modulation of Cdc2/Cdk-1
protein in prostate cancer cells (PC-3). PC- 3 cells are human androgen independent cancer cells and were cultured with quercetin
at concentrations of 50 and 100 μM for 24 h. Cell proliferation, apoptosis and cell cycle distribution were analyzed. Expression
of Cdc2/Cdk-1, cyclin B1, cyclin A, p21/Cip1, pRb, pRb2/p130, Bcl-2, Bcl-XL, Bax and caspase-3 proteins were studied with western blot analysis. Addition of quercetin led to substantial decrease in
the expression of Cdc2/Cdk-1, cyclin B1 and phosphorlyated pRb and increase in p21. Flowcytometric analysis showed that quercetin
blocks G2-M transition, with significant induction of apoptosis. Apoptosis markers like Bcl-2 and Bcl-XL were significantly decreased and Bax and caspase-3 were increased. From this study, it was concluded that quercetin inhibits
prostate cancer cell proliferation by altering the expression of cell cycle regulators and apoptotic proteins.
This work was supported by grants from University Grants Commission (UGC award No. F.3.41 / 2002 (SR-II) dated 14-03-2002)
to Dr. J. Arunakaran. |
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Keywords: | Quercetin Prostate cancer Cdc2 pRb Cyclins p21/Cip1 Bcl-2 Bax Caspase-3 Cell cycle |
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