Basolateral Proteinase-activated Receptor (PAR-2) Induces Chloride Secretion in M-1 Mouse Renal Cortical Collecting Duct Cells

Overview

Journal J Physiol

Specialty Physiology

Date 1999 Nov 24

PMID 10562330

Citations 27

Authors

M Bertog

B Letz

W Kong

M Steinhoff

M A Higgins

E Fromter

N W Bunnett

C Korbmacher

Affiliations

Soon will be listed here.

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.

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