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2017 ; 41
(3
): 262-273.e6
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Gastric Acid Secretion from Parietal Cells Is Mediated by a Ca(2+) 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
PMID28486130
show ga
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
Ca(2+) 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 Ca(2+) release from TV stores. Hence, we demonstrated that
ML1, acting as a Ca(2+) channel in TVs, links transmitter-initiated cyclic
nucleotide signaling with Ca(2+)-dependent TV exocytosis in parietal cells,
providing a regulatory mechanism that could be targeted to manage acid-related
gastric diseases.