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- W2416999119 abstract "The role of the cystic fibrosis transmembrane conductance regulator (CFTR) in cAMP-stimulated secretion across the murine duodenum was investigated. Serosal-to-mucosal flux of (J s→m, in μeq ⋅ cm−2 ⋅ h−1) and short-circuit current (I sc; in μeq ⋅ cm−2 ⋅ h−1) were measured by the pH stat method in duodenum from CFTR knockout [CFTR(−)] and normal [CFTR(+)] mice. Under control conditions, forskolin increased J s→m andI sc (+1.7 and +3.5, respectively) across the CFTR(+) but not CFTR(−) duodenum. Both the forskolin-stimulated ΔJ s→m and ΔI sc were abolished by the CFTR channel blocker 5-nitro-2-(3-phenylpropylamino)benzoate, whereas inhibition of luminal Cl−/ exchange by luminal Cl− removal or DIDS reduced theJ s→m by ∼18% without a consistent effect on the ΔI sc. Methazolamide also reduced theJ s→m by 39% but did not affect the ΔI sc. When carbonic anhydrase-dependent secretion was isolated by using a CO2-gassed, -free Ringer bath, forskolin stimulated the J s→m andI sc (+0.7 and +2.0, respectively) across CFTR(+) but not CFTR(−) duodenum. Under these conditions, luminal Cl− substitution or DIDS abolished theJ s→m but not the ΔI sc. It was concluded that cAMP-stimulated secretion across the duodenum involves 1) electrogenic secretion via a CFTR conductance and2) electroneutral secretion via a CFTR-dependent Cl−/ exchange process that is closely associated with the carbonic anhydrase activity of the epithelium." @default.
- W2416999119 created "2016-06-24" @default.
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- W2416999119 date "1998-04-01" @default.
- W2416999119 modified "2023-10-14" @default.
- W2416999119 title "Dual role of CFTR in cAMP-stimulated HCO 3 − secretion across murine duodenum" @default.
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- W2416999119 doi "https://doi.org/10.1152/ajpgi.1998.274.4.g718" @default.
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