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• W2617154039 endingPage "1311" @default.
• W2617154039 startingPage "1301" @default.
• W2617154039 abstract "The epithelial calcium (Ca2+) channel TRPV5 (transient receptor potential vanilloid 5) is expressed in the distal convoluted tubule of the kidney and facilitates active Ca2+ reabsorption. This process is instrumental for the maintenance of Ca2+ homeostasis. Therefore, all aspects of TRPV5 function are tightly regulated by the calciotropic parathyroid hormone (PTH). Rabbit (rb)TRPV5 channel activity was shown to be stimulated upon PTH-mediated protein kinase A (PKA) phosphorylation. Since there is incomplete conservation of the PKA consensus motif (RR/QxT) across species, the aim of this study was to extend these findings to humans and characterize the expression and function of human (h)TRPV5. Functional differences between rbTRPV5 and hTRPV5 upon PTH stimulation were investigated using 45Ca2+ uptake assays, Fura-2 Ca2+ imaging, and cell surface biotinylation. While PTH treatment enhanced rbTRPV5 channel activity, it did not stimulate hTRPV5 activity. Mutation of the human RQxT motif into rabbit RRxT (hTRPV5 Q706R) partially restored the sensitivity to PTH. An ancestral sequence reconstruction of TRPV5 orthologues demonstrated that the change in the RRxT motif coincides with the creation of another putative PKA motif (RGAS to RRAS) in the amino terminus of hTRPV5. Interestingly, a constitutively phosphorylated hTRPV5 mutant (hTRPV5 S141D) displayed significantly decreased channel function, while its plasma membrane abundance was increased. Taken together, PTH-mediated stimulation of TRPV5, via PKA, is not conserved in humans. Our data suggest that PTH regulation of TRPV5 is altered in humans, an important observation for future studies that may add to new concepts on the role of PTH in renal Ca2+ handling." @default.
• W2617154039 created "2017-06-05" @default.
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• W2617154039 date "2017-05-22" @default.
• W2617154039 modified "2023-10-18" @default.
• W2617154039 title "Interspecies differences in PTH-mediated PKA phosphorylation of the epithelial calcium channel TRPV5" @default.
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• W2617154039 doi "https://doi.org/10.1007/s00424-017-1996-9" @default.
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