Arachidonic acid inhibits both K+ and Ca2+ currents in isolated type I cells of the rat carotid body

Whole-cell patch-clamp recordings were used to investigate the effects of arachidonic acid (AA) on K+ and Ca2+ channels in isolated rat type I carotid body cells. AA (2-20 microM) produced a concentration-dependent inhibition of both K+ currents and Ca2+ channel currents. The effects of AA on K+ cur...

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Veröffentlicht in:Brain research 1998-03, Vol.787 (2), p.315-320
Hauptverfasser: HATTON, C. J, PEERS, C
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PEERS, C
description Whole-cell patch-clamp recordings were used to investigate the effects of arachidonic acid (AA) on K+ and Ca2+ channels in isolated rat type I carotid body cells. AA (2-20 microM) produced a concentration-dependent inhibition of both K+ currents and Ca2+ channel currents. The effects of AA on K+ currents were unaffected by indomethacin (5 microM), phenidone (5 microM) or 1-aminobenzotriazole (3 mM), suggesting that AA did not exert its effects via cyclo-oxygenase, lipoxygenase or cytochrome P-450 (cP-450) metabolism. Our results suggest that AA directly and non-selectively inhibits ionic currents in rat type I carotid body cells.
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subjects Animals
Arachidonic Acid - pharmacology
Biological and medical sciences
Calcium Channel Blockers - pharmacology
Calcium Channels - metabolism
Cardiorespiratory control. Arterial mecano- and chemoreceptor
Carotid Body - drug effects
Carotid Body - enzymology
Carotid Body - metabolism
Cyclooxygenase Inhibitors - pharmacology
Cytochrome P-450 Enzyme Inhibitors
Electrophysiology
Fundamental and applied biological sciences. Psychology
Lipoxygenase Inhibitors - pharmacology
Patch-Clamp Techniques
Potassium Channel Blockers
Rats
Rats, Wistar
Vertebrates: respiratory system
title Arachidonic acid inhibits both K+ and Ca2+ currents in isolated type I cells of the rat carotid body
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