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Gastric Acid Secretion from Parietal Cells Is Mediated by a Ca2+ Efflux Channel in the Tubulovesicle.

Abstract：

:Gastric acid secretion by parietal cells requires trafficking and exocytosis of H/K-ATPase-rich tubulovesicles (TVs) toward apical membranes in response to histamine stimulation via cyclic AMP 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.

journal_name

Dev Cell

journal_title

Developmental cell

authors

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

doi

10.1016/j.devcel.2017.04.003

subject

Has Abstract

pub_date

2017-05-08 00:00:00

pages

262-273.e6

issue

3

eissn

1534-5807

issn

1878-1551

pii

S1534-5807(17)30296-4

journal_volume

41

pub_type

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