Decreased expression of the epithelial Ca2+ channel TRPV5 and TRPV6 in human renal cell carcinoma associated with vitamin D receptor.

Abstract

PURPOSE:

We investigated the expression of epithelial Ca(2+) 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 significantly correlated with that of TRPV6 (r = 0.508, p = 0.007) and TRPV5 (r = 0.697, p = 0.032) in renal cell carcinoma. Western blot showed results similar to those of reverse transcriptase-polymerase chain reaction. Different expression was detected between kidney and renal cell carcinoma tissue. Immunohistochemical analysis verified strong detection of TRPV5/6 and vitamin D receptor in distal nephrons but demonstrated weak or no immunostaining much more often in renal cell carcinoma.

CONCLUSIONS:

Decreased TRPV5/V6 expression was noted in renal cell carcinoma, which correlated with vitamin D receptor. Different expression was also detected among the different renal cell carcinoma histopathological subtypes. Our observations suggest that altered vitamin D receptor expression may be associated with renal cell carcinoma carcinogenesis via TRPV5/6.

• Authors: Yongyang Wu, Tatsuya Miyamoto, Kai Li, Hiroshi Nakagomi, Norifumi Sawada, Satoru Kira, Hideki Kobayashi, Hidenori Zakohji, Takayuki Tsuchida, Mizuya Fukazawa, Isao Araki, Masayuki Takeda
• Journal: The Journal of urology (J Urol) Vol. 186 Issue 6 Pg. 2419-25 (Dec 2011) ISSN: 1527-3792 [Electronic] United States
• PMID: 22019165 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 American Urological Association Education and Research, Inc. Published by Elsevier Inc. All rights reserved.

Chemical References

• Calcium Channels
• Receptors, Calcitriol
• TRPV Cation Channels
• TRPV5 protein, human
• TRPV6 protein, human

Topics

• Adult
• Aged
• Aged, 80 and over
• Calcium Channels (biosynthesis)
• Carcinoma, Renal Cell (metabolism)
• Female
• Humans
• Kidney Neoplasms (metabolism)
• Male
• Middle Aged
• Receptors, Calcitriol (biosynthesis)
• TRPV Cation Channels (biosynthesis)