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2016 ; 291
(39
): 20345-52
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HCO3- Transport through Anoctamin/Transmembrane Protein ANO1/TMEM16A in
Pancreatic Acinar Cells Regulates Luminal pH
#MMPMID27510033
Han Y
; Shewan AM
; Thorn P
J Biol Chem
2016[Sep]; 291
(39
): 20345-52
PMID27510033
show ga
The identification of ANO1/TMEM16A as the likely calcium-dependent chloride
channel of exocrine glands has led to a more detailed understanding of its
biophysical properties. This includes a calcium-dependent change in channel
selectivity and evidence that HCO3 (-) permeability can be significant. Here we
use freshly isolated pancreatic acini that preserve the luminal structure to
measure intraluminal pH and test the idea that ANO1/TMEM16A contributes to
luminal pH balance. Our data show that, under physiologically relevant
stimulation with 10 pm cholesystokinin, the luminal acid load that results from
the exocytic fusion of zymogen granules is significantly blunted by HCO3 (-)
buffer in comparison with HEPES, and that this is blocked by the specific TMEM16A
inhibitor T16inh-A01. Furthermore, in a model of acute pancreatitis, we observed
substantive luminal acidification and provide evidence that ANO1/TMEM16A acts to
attenuate this pH shift. We conclude that ANO1/TMEM16A is a significant pathway
in pancreatic acinar cells for HCO3 (-) secretion into the lumen.