TRP Channels

TRP Channels

New Book on TRP Channels

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Transient Receptor Potential Channels offers a unique blend of thoughtfully selected topics ranging from the structural biology of this fascinating group of ion channels to their emerging roles in human diseases. This single book covers TRP channels of yeasts, flies, fishes frogs and humans. And from the biophysics of primary thermo-sensory events in cells to the thermosensation at whole organism level, from physiology of pain to the development of pain-killers, from psychiatric illnesses to cancers, from skin cells to sperms, from taste buds to testes, from established facts to heated debates, this book contains something for every TRP enthusiasts, beginner and expert alike. It includes crucial background information, critical analysis of cutting edge research, and ideas and thoughts for numerous testable hypotheses. It also shows directions for future research in this highly dynamic field. It is a book readers will be just as eager to give to others as keep for themselves. Transient Receptor Potential Channels (Advances in Experimental Medicine and Biology) [Hard cover]. Md. Shahidul Islam (Editor). Publisher: Springer. 52 chapters, 125 authors, about 1115 pages

Chapter 14

AbstractsPosted by Md. Shahidul Islam Wed, February 16, 2011 15:14:52

TRPV5 and TRPV6 in Transcellular Ca2+ Transport: Regulation, Gene Duplication, and Polymorphisms in African Populations

Ji-Bin Peng

TRPV5 and TRPV6 are unique members of the TRP super family. They are highly selective for Ca2+ ions with multiple layers of Ca2+-dependent inactivation mechanisms, expressed at the apical membrane of Ca2+ transporting epithelia, and robustly responsive to 1,25-dihydroxivitamin D3. These features are well suited for their roles as Ca2+ entry channels in the first step of transcellular Ca2+ transport pathways, which are involved in intestinal absorption, renal reabsorption of Ca2+, placental transfer of Ca2+ to fetus, and many other processes. While TRPV6 is more broadly expressed in a variety of tissues such as esophagus, stomach, small intestine, colon, kidney, placenta, pancreas, prostate, uterus, salivary gland, and sweat gland, TRPV5 expression is relatively restricted to the distal convoluted tubule and connecting tubule of the kidney. There is only one TRPV6-like gene in fish and birds in comparison to both TRPV5 and TRPV6 genes in mammals, indicating TRPV5 gene was likely generated from duplication of TRPV6 gene during the evolution of mammals to meet the needs of complex renal function. TRPV5 and TRPV6 are subjected to vigorous regulations under physiological, pathological, and therapeutic conditions. The elevated TRPV6 level in malignant tumors such as prostate and breast cancers makes it a potential therapeutic target. TRPV6, and to a lesser extent TRPV5, exhibit unusually high levels of single nucleotide polymorphisms (SNPs) in African populations as compared to other populations, indicating TRPV6 gene was under selective pressure during or after humans migrated out of Africa. The SNPs of TRPV6 and TRPV5 likely contribute to the Ca2+ conservation mechanisms in African populations.

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