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  Differences in the negative allosteric modulation of gamma-aminobutyric acid receptors elicited by 4'-chlorodiazepam and by a beta-carboline-3-carboxylate ester: a study with natural and reconstituted receptors

Puia, G., Santi, M. R., Pritchett, D. B., Seeburg, P. H., & Costa, E. (1989). Differences in the negative allosteric modulation of gamma-aminobutyric acid receptors elicited by 4'-chlorodiazepam and by a beta-carboline-3-carboxylate ester: a study with natural and reconstituted receptors. Proceedings of the National Academy of Sciences of the United States of America, 86(18), 7275-7279. Retrieved from http://www.pnas.org/content/86/18/7275.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-854B-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-854C-5
Genre: Journal Article

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PNAS_86_1989_7275.pdf (Any fulltext), 994KB
 
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 Creators:
Puia, Giulia, Author
Santi, Maria Rita, Author
Pritchett, Dolan B., Author
Seeburg, Peter H.1, Author              
Costa, Erminio, Author
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1Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Max Planck Society, ou_1497704              

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 Abstract: Cl- currents elicited by gamma-aminobutyric acid (GABA) application were recorded with the whole-cell tight-seal technique from voltage-clamped cortical neurons of neonatal rats in primary culture. The peripheral benzodiazepine recognition site ligand 4'-chlorodiazepam [Ro 5-4864; 7-chloro-1,3-dihydro-1-methyl-5-(4-chlorophenyl)-2H-[1,4]-benzodiazep in-2- one] inhibited the GABA-generated currents in a dose-dependent manner. Also, a beta-carboline (DMCM; 6,7-dimethoxy-4-ethyl-beta-carboline-3-carboxylate methyl ester), acting as a negative allosteric modulator of GABAA receptors, reduced the intensity of GABA-generated currents with similar efficacy but greater potency. Flumazenil (Ro 15-1788; 8-fluro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo-[1,5-a] [1,4]-benzodiazepine-3-carboxylate ethyl ester) antagonized DMCM inhibition but not that elicited by 4'-chlorodiazepam. The isoquinoline carboxamide PK 11195, an antagonist of 4'-chlorodiazepam effects in other systems, failed to antagonize the action of 4'-chlorodiazepam. The transient expression of various molecular forms of GABAA receptors in the human embryonic kidney cell line 293 allowed a study of the minimal structural requirements for the inhibition of GABA-induced Cl- currents by bicuculline, picrotoxin, 4'-chlorodiazepam, and DMCM. GABA-elicited Cl- currents in cells coexpressing alpha 1 and beta 1 subunits of GABAA receptors were inhibited by bicuculline and picrotoxin, but not by DMCM or 4'-chlorodiazepam. Conversely, the GABA currents in cells coexpressing alpha 1 beta 1 and gamma 2 subunits were inhibited by bicuculline, picrotoxin, 4'-chlorodiazepam, and DMCM. Since the Cl- currents generated by GABA in some molecular forms of GABAA receptors are inhibited by bicuculline and picrotoxin only, 4'-chlorodiazepam cannot be acting isosterically with picrotoxin.

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Language(s): eng - English
 Dates: 1989-06-281989-09-15
 Publication Status: Published in print
 Pages: 5
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 Rev. Method: Peer
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proceedings of the National Academy of Sciences of the USA
  Other : Proc. Acad. Sci. USA
  Other : Proc. Acad. Sci. U.S.A.
  Abbreviation : PNAS
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 86 (18) Sequence Number: - Start / End Page: 7275 - 7279 Identifier: ISSN: 0027-8424
CoNE: /journals/resource/954925427230