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Effects of diuretics on GABA‐gated chloride current in frog isolated sensory neurones

Effects of diuretics on GABA‐gated chloride current in frog isolated sensory neurones 1 Effects of three diuretics (furosemide, amiloride and α‐human atrial natriuretic polypeptide (α‐hANP)) on GABA‐activated chloride current (ICl) were investigated in frog isolated sensory neurones, following suppression of Na+, K+ and Ca2+ currents, by use of a ‘concentration‐clamp’ technique. 2 Furosemide inhibited the GABA‐activated ICl in a non‐competitive manner and facilitated the inactivation phase, while amiloride inhibited the GABA response in a competitive manner, both inhibitions being concentration‐dependent. α‐hANP had no effects on the GABA‐induced ICl. 3 The reversal potential of GABA‐activated ICl (EGABA) was not shifted in the presence of amiloride or furosemide. 4 The results suggest that amiloride may act at the GABA binding site while furosemide may act on the GABA‐gated chloride channel. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png British Journal of Pharmacology Wiley

Effects of diuretics on GABA‐gated chloride current in frog isolated sensory neurones

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References (37)

Publisher
Wiley
Copyright
1988 British Pharmacological Society
ISSN
0007-1188
eISSN
1476-5381
DOI
10.1111/j.1476-5381.1988.tb10326.x
Publisher site
See Article on Publisher Site

Abstract

1 Effects of three diuretics (furosemide, amiloride and α‐human atrial natriuretic polypeptide (α‐hANP)) on GABA‐activated chloride current (ICl) were investigated in frog isolated sensory neurones, following suppression of Na+, K+ and Ca2+ currents, by use of a ‘concentration‐clamp’ technique. 2 Furosemide inhibited the GABA‐activated ICl in a non‐competitive manner and facilitated the inactivation phase, while amiloride inhibited the GABA response in a competitive manner, both inhibitions being concentration‐dependent. α‐hANP had no effects on the GABA‐induced ICl. 3 The reversal potential of GABA‐activated ICl (EGABA) was not shifted in the presence of amiloride or furosemide. 4 The results suggest that amiloride may act at the GABA binding site while furosemide may act on the GABA‐gated chloride channel.

Journal

British Journal of PharmacologyWiley

Published: Mar 1, 1988

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