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• W2141312912 abstract "cAMP induces both active Cl(-) and active K(+) secretion in mammalian colon. It is generally assumed that a mechanism for K(+) exit is essential to maintain cells in the hyperpolarized state, thus favoring a sustained Cl(-) secretion. Both Kcnn4c and Kcnma1 channels are located in colon, and this study addressed the questions of whether Kcnn4c and/or Kcnma1 channels mediate cAMP-induced K(+) secretion and whether cAMP-induced K(+) secretion provides the driving force for Cl(-) secretion. Forskolin (FSK)-enhanced short-circuit current (indicator of net electrogenic ion transport) and K(+) fluxes were measured simultaneously in colonic mucosa under voltage-clamp conditions. Mucosal Na(+) orthovanadate (P-type ATPase inhibitor) inhibited active K(+) absorption normally present in rat distal colon. In the presence of mucosal Na(+) orthovanadate, serosal FSK induced both K(+) and Cl(-) secretion. FSK-induced K(+) secretion was 1) not inhibited by either mucosal or serosal 1-[(2-chlorophenyl) diphenylmethyl]-1H-pyrazole (TRAM-34; a Kcnn4 channel blocker), 2) inhibited (92%) by mucosal iberiotoxin (Kcnma1 channel blocker), and 3) not affected by mucosal cystic fibrosis transmembrane conductance regulator inhibitor (CFTR(inh)-172). By contrast, FSK-induced Cl(-) secretion was 1) completely inhibited by serosal TRAM-34, 2) not inhibited by either mucosal or serosal iberiotoxin, and 3) completely inhibited by mucosal CFTR(inh)-172. These results indicate that cAMP-induced colonic K(+) secretion is mediated via Kcnma1 channels located in the apical membrane and most likely contributes to stool K(+) losses in secretory diarrhea. On the other hand, cAMP-induced colonic Cl(-) secretion requires the activity of Kcnn4b channels located in the basolateral membrane and is not dependent on the concurrent activation of apical Kcnma1 channels." @default.
• W2141312912 created "2016-06-24" @default.
• W2141312912 creator A5056444185 @default.
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• W2141312912 date "2012-08-01" @default.
• W2141312912 modified "2023-10-14" @default.
• W2141312912 title "Cyclic AMP-induced K⁺secretion occurs independently of Cl⁻secretion in rat distal colon" @default.
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• W2141312912 doi "https://doi.org/10.1152/ajpcell.00099.2012" @default.
• W2141312912 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3423024" @default.
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