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TRPV5 and TRPV6 in Ca(2+) (re)absorption: regulating Ca(2+) entry at the gate
Tom Nijenhuis1, Joost G J Hoenderop, René J M Bindels
1Department of Physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
Pflugers Archiv : European Journal of Physiology
|July 27, 2005
Summary
Maintaining body calcium (Ca2+) balance is vital. Specialized epithelial calcium channels, TRPV5 and TRPV6, in the kidney and intestine are key regulators of this process, ensuring proper calcium absorption and reabsorption.
Area of Science:
- Physiology
- Molecular Biology
- Nephrology
Background:
- Body calcium (Ca2+) homeostasis is critical for numerous physiological functions.
- This balance is maintained through intestinal absorption, bone exchange, and renal reabsorption.
- Renal and duodenal epithelial cells actively transport Ca2+ via a transcellular route.
Purpose of the Study:
- To provide an overview of current knowledge on the regulation of epithelial calcium channels.
- To highlight recent advances in understanding the coordinated regulation of TRPV5 and TRPV6.
- To emphasize the importance of controlling Ca2+ influx for transcellular Ca2+ transport.
Main Methods:
- Review of existing literature on TRPV5 and TRPV6.
- Analysis of regulatory mechanisms governing Ca2+ influx.
- Synthesis of information on transcellular Ca2+ (re)absorption.
Main Results:
- TRPV5 and TRPV6 are specialized epithelial Ca2+ channels crucial for transcellular Ca2+ (re)absorption.
- These channels mediate the rate-limiting Ca2+ entry step in the intestine and kidney.
- Regulation of Ca2+ flux through TRPV5/6 is essential for fine-tuning body Ca2+ levels.
Conclusions:
- TRPV5 and TRPV6 play pivotal roles in maintaining Ca2+ balance.
- Coordinated regulation of these channels is critical for physiological Ca2+ transport.
- Understanding TRPV5/6 regulation offers insights into calcium homeostasis.