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Molecular and Cellular Biochemistry

, Volume 297, Issue 1–2, pp 1–8 | Cite as

Bradykinin-induced chloride conductance in murine proximal tubule epithelial cells

  • Manish M. Tiwari
  • Joseph R. Stimers
  • Philip R. Mayeux
Article

Abstract

Despite the recognized role of bradykinin (BK)-induced calcium and chloride conductance in regulating salt transport in the kidney, the signaling pathway involved has not been well examined. Patch clamp of murine proximal tubule (TKPTS) cells revealed that BK (10 nM) produced an increase in an outwardly rectifying current from a basal level of 2.9 ± 0.6 to 13.8 ± 1.1 pA/pF following addition of BK (n = 8; p < 0.001). The shift in reversal potential seen with BK on changing the intracellular solution to 152 mM chloride and significant inhibition of the current by 100 μM 4,4′-di-isothiocyanato-stilbene-2,2′-disulphonic acid (DIDS) suggested that BK activated a chloride current. BK-induced current was blocked by B2 receptor antagonist but not by B1 antagonist or pertussis toxin indicating that the current was mediated by B2 receptors possibly through Gq activation. TMB-8 completely blocked the BK-calcium rise in fura-2 studies but did not block the BK-chloride response indicating that BK-mediated chloride current is calcium-independent. BK-induced current was dependent on phospholipase C (PLC) since U73122, a PLC-β blocker (10 μM) blocked it completely. Furthermore, chloride conductance was not modulated by bisindolylmaleimide, an inhibitor of protein kinase C (PKC), but was enhanced by dibutyryl cAMP. We conclude that BK-induced rise in chloride current is mediated by B2 receptors and dependent on PLC activation but not dependent on calcium rise. Furthermore, the current can be modulated by cAMP but not PKC.

Keywords

bradykinin chloride current proximal tubule 

Abbreviations

BK

Arg-Pro-Pro-Gly-Phe-Ser-Pro-Phe-Arg)

U-73122

1-[6-[[17 beta-3-methoxyestra-1,3,5(10)-trien-17-yl]amino]hexyl]-1H-pyrrole-2,5-dione

DIDS

4,4′-di-isothiocyanato-stilbene-2,2′-disulphonic acid

BIM

bisindolylmaleimide

TMB-8

8-(N,N-diethylamino)octyl-3,4,5-trimethoxybenzoate hydrochloride

PLC

phospholipase C

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Notes

Acknowledgements

This research was supported by funds from the UAMS Graduate Student Research Fund awarded to M.M. Tiwari.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Manish M. Tiwari
    • 1
  • Joseph R. Stimers
    • 1
  • Philip R. Mayeux
    • 1
  1. 1.Department of Pharmacology and ToxicologyUniversity of Arkansas for Medical SciencesLittle RockUSA

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