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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Dev+Cell 2017 ; 41 (3): 262-273.e6 Nephropedia Template TP
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Gastric acid secretion from parietal cells is mediated by a Ca2+ efflux channel in the tubulovesicle #MMPMID28486130
Sahoo N; Gu M; Zhang X; Raval N; Yang J; Bekier M; Calvo R; Patnaik S; Wang W; King G; Samie M; Gao Q; Sahoo S; Sundaresan S; Keeley TM; Wang Y; Marugan J; Ferrer M; Samuelson LC; Merchant JL; Xu H
Dev Cell 2017[May]; 41 (3): 262-273.e6 PMID28486130show ga
Gastric acid secretion by parietal cells requires trafficking and exocytosis of H-K-ATPaserich tubulovesicles (TVs) toward apical membranes in response to histamine stimulation via cAMP elevation. Here, we found that TRPML1 (ML1), a protein that is mutated in type IV Mucolipidosis (ML-IV), is a tubulovesicular channel essential for TV exocytosis and acid secretion. Whereas ML-IV patients are reportedly achlorhydric, transgenic overexpression of ML1 in mouse parietal cells induced constitutive acid secretion. Gastric acid secretion was blocked and stimulated by ML1 inhibitors and agonists, respectively. Organelle-targeted Ca2+ imaging and direct patch-clamping of apical vacuolar membranes revealed that ML1 mediates a PKA-activated conductance on TV membranes that is required for histamine-induced Ca2+ release from TV stores. Hence, we demonstrated that ML1, acting as a Ca2+ channel in TVs, links transmitter-initiated cyclic nucleotide signaling with Ca2+-dependent TV exocytosis in parietal cells, providing a regulatory mechanism that could be targeted to manage acid-related gastric diseases.