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- W2033181607 abstract "1 Using RT-PCR, Northern blot analysis, and immunocytochemistry, we confirmed renal expression of proteinase-activated receptor (PAR-2) and demonstrated its presence in native renal epithelial and in cultured M-1 mouse cortical collecting duct (CCD) cells. 2 We investigated the effects of a PAR-2 activating peptide (AP), corresponding to the tethered ligand that is exposed upon trypsin cleavage, and of trypsin on M-1 cells using patch-clamp, intracellular calcium (fura-2) and transepithelial short-circuit current (ISC) measurements. 3 In single M-1 cells, addition of AP elicited a concentration-dependent transient increase in the whole-cell conductance. Removal of extracellular Na+ had no effect while removal of Cl− prevented the stimulation of outward currents. The intracellular calcium concentration increased significantly upon application of AP while a Ca2+-free pipette solution completely abolished the electrical response to AP. 4 In confluent monolayers of M-1 cells, apical application of AP had no effect on ISC whereas subsequent basolateral application elicited a transient increase in ISC. This increase was not due to a stimulation of electrogenic Na+ absorption since the response was preserved in the presence of amiloride. 5 The ISC response to AP was reduced in the presence of the Cl− channel blocker diphenylamine-2-carboxylic acid on the apical side and abolished in the absence of extracellular Cl−. 6 Trypsin elicited similar responses to those to AP while application of a peptide (RP) with the reverse amino acid sequence of AP had no effect on whole-cell currents or ISC. 7 In conclusion, our data suggest that AP or trypsin stimulates Cl− secretion by Ca2+-activated Cl− channels in M-1 CCD cells by activating basolateral PAR-2." @default.
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- W2033181607 date "1999-11-01" @default.
- W2033181607 modified "2023-10-16" @default.
- W2033181607 title "Basolateral proteinase‐activated receptor (PAR‐2) induces chloride secretion in M‐1 mouse renal cortical collecting duct cells" @default.
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- W2033181607 doi "https://doi.org/10.1111/j.1469-7793.1999.00003.x" @default.
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