Male fertility depends on Ca²+ absorption by TRPV6 in epididymal epithelia

TRPV6 [transient receptor potential vanilloid 6] is a calcium ion (Ca²+)-selective channel originally identified in the duodenal epithelium and in placenta; replacement of a negatively charged aspartate in the pore-forming region with an uncharged alanine (D541A) renders heterologously expressed TRP...

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Bibliographic Details
Published in:Science signaling 2011-05, Vol.4 (171), p.ra27-ra27
Main Authors: Weissgerber, Petra, Kriebs, Ulrich, Tsvilovskyy, Volodymyr, Olausson, Jenny, Kretz, Oliver, Stoerger, Christof, Vennekens, Rudi, Wissenbach, Ulrich, Middendorff, Ralf, Flockerzi, Veit, Freichel, Marc
Format: Article
Language:English
Subjects:
Animals
Calcium - metabolism
Calcium Channels - genetics
Calcium Channels - metabolism
Cell Survival - physiology
Cercopithecus aethiops
COS Cells
Epididymis - metabolism
Epithelium - metabolism
Female
Fertility - physiology
HEK293 Cells
Humans
Infertility, Male - genetics
Infertility, Male - metabolism
Male
Mice
Mice, Mutant Strains
Spermatogenesis - physiology
Spermatozoa - metabolism
TRPV Cation Channels - genetics
TRPV Cation Channels - metabolism
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Summary:TRPV6 [transient receptor potential vanilloid 6] is a calcium ion (Ca²+)-selective channel originally identified in the duodenal epithelium and in placenta; replacement of a negatively charged aspartate in the pore-forming region with an uncharged alanine (D541A) renders heterologously expressed TRPV6 channels nonfunctional. We found that male, but not female, mice homozygous for this mutation (Trpv6(D541A/D541A)) showed severely impaired fertility. The motility and fertilization capacity of sperm were markedly reduced, despite intact spermatogenesis. Trpv6 was expressed in epididymal epithelium where the protein was detected in the apical membrane, whereas it was not expressed in spermatozoa or the germinal epithelium. The Ca²+ concentration of the fluid in the cauda epididymis of Trpv6(D541A/D541A) males was 10 times higher than that of wild-type mice, which was accompanied by a seven- to eightfold decrease in Ca²+ absorption through the epididymal epithelium and was associated with reduced sperm viability. Thus, appropriate Ca²+ absorption and a consequent TRPV6-mediated decrease in the extracellular Ca²+ concentration toward the distal segments of the epididymal duct are essential for the acquisition of basic functions and the survival of spermatozoa.
ISSN:1937-9145
DOI:10.1126/scisignal.2001791