Decreased Expression of the Epithelial Ca2+ Channel TRPV5 and TRPV6 in Human Renal Cell Carcinoma Associated With Vitamin D Receptor
2011
Purpose: We investigated the expression of epithelial Ca2+ channel TRPV (transient receptor potential vanilloid subfamily) 5 and 6, and vitamin D receptor in primary human renal cell carcinoma and benign peritumor tissues, and assessed the possible association between TRPV5/6 and vitamin D receptor expression.Materials and Methods: Fresh-frozen primary tumor and peritumor tissues from 27 patients diagnosed with renal cell carcinoma were analyzed for TRPV5/6 and vitamin D receptor expression by quantitative reverse transcriptase-polymerase chain reaction, Western blot and immunohistochemistry.Results: Quantitative reverse transcriptase-polymerase chain reaction revealed that TRPV5/6 and vitamin D receptor expression was decreased 38.11, 4.44 and 3.20 times in renal cell carcinoma vs normal kidney tissue (p = 0.012, 0.002 and 0.020, respectively). Relatively higher expression was noted for chromophobe renal cell carcinoma than for the other renal cell carcinoma subtypes. Vitamin D receptor mRNA expression s...
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