Abstract
A20 is a TNF-inducible primary response gene and its product, a zinc finger protein, has antiapoptotic function in several cancer cells. We studied A20 gene expression in the Vitamin D- and TNF-sensitive LNCaP cell line and in the Vitamin D- and TNF-resistant PC-3 cell line. The results of the quantitative real-time RT-PCR analyses demonstrated that the basal level of A20 mRNA production in PC-3 cells was considerably higher than in LNCaP cells that is associated with the resistance of PC-3 cells. TNF induced A20 gene expression in both cell lines, but with different effect. A20 mRNA expression was down-regulated by 10 nM calcitriol within 3–9 h after treatment and up-regulated by androgen reaching maximal values by 6 h after stimulation in LNCaP cells. We conclude that A20 may be involved in the regulation of cell proliferation by TNF, Vitamin D, and androgen in prostate cancer.
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