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Effects of the Kava Chalcone Flavokawain A Differ in Bladder Cancer Cells with Wild-type versus Mutant p53

Authors' Affiliations: ¹ Department of Urology and ² Chao Family Comprehensive Cancer Center, University of California, Irvine, Orange, California

Requests for reprints: Xiaolin Zi, Chao Family Comprehensive Cancer Center, 101 The City Drive South, Route 81, Building 23, Room 431, Orange, CA 92868. Phone: 714-456-8316; Fax: 714-456-2240; E-mail: xzi{at}uci.edu.

Flavokawain A is the predominant chalcone from kava extract. We have assessed the mechanisms of flavokawain A's action on cell cycle regulation. In a p53 wild-type, low-grade, and papillary bladder cancer cell line (RT4), flavokawain A increased p21/WAF1 and p27/KIP1, which resulted in a decrease in cyclin-dependent kinase-2 (CDK2) kinase activity and subsequent G₁ arrest. The increase of p21/WAF1 protein corresponded to an increased mRNA level, whereas p27/KIP1 accumulation was associated with the down-regulation of SKP2, which then increased the stability of the p27/KIP1 protein. The accumulation of p21/WAF1 and p27/KIP1 was independent of cell cycle position and thus not a result of the cell cycle arrest. In contrast, flavokawain A induced a G₂-M arrest in six p53 mutant-type, high-grade bladder cancer cell lines (T24, UMUC3, TCCSUP, 5637, HT1376, and HT1197). Flavokawain A significantly reduced the expression of CDK1-inhibitory kinases, Myt1 and Wee1, and caused cyclin B1 protein accumulation leading to CDK1 activation in T24 cells. Suppression of p53 expression by small interfering RNA in RT4 cells restored Cdc25C expression and down-regulated p21/WAF1 expression, which allowed Cdc25C and CDK1 activation, which then led to a G₂-M arrest and an enhanced growth-inhibitory effect by flavokawain A. Consistently, flavokawain A also caused a pronounced CDK1 activation and G₂-M arrest in p53 knockout but not in p53 wild-type HCT116 cells. This selectivity of flavokawain A for inducing a G₂-M arrest in p53-defective cells deserves further investigation as a new mechanism for the prevention and treatment of bladder cancer.

Key Words: Flavokawain A • p53 • Cdc25C • Myt1 • Wee1 • SKP-2 • p27/KIP1 • p21/WAF1

Commentary

Kava, a Tonic for Relieving the Irrational Development of Natural Preventive Agents

Rajesh Agarwal and Gagan Deep
Cancer Prevention Research 2008 1: 409-412. [Full Text] [PDF]