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GAEAA receptor complex function in frontal cortex membranes from control and neurological patients

Identifieur interne : 002B32 ( Main/Corpus ); précédent : 002B31; suivant : 002B33

GAEAA receptor complex function in frontal cortex membranes from control and neurological patients

Auteurs : G. Kenneth Lloyd ; Armand Lowenthal ; France Javoy-Agid ; Jean Constantidinis

Source :

RBID : ISTEX:0A9C64FDFDDE488FB659612ABFEB2E432F72039D

Abstract

The functional integrity of the GABAA receptof-benzodiazepine (BZ) recognition site-Cl− ionophore complex was assessed by means of [35S]TBPS (t-butylbicyclophosphorothionate) binding to frontal cortex membranes prepared from frozen postmortem brain tissue taken from control (n = 4), Alzheimer (n = 7), Parkinson (n = 3) and Huntington's chorea (n = 2) patients. Specific [35S]TBPS binding was similar in control, Parkinson's disease and Huntington's chorea brains, but was significantly reduced (78% control, P < 0.01) in frontal cortex membranes from Alzheimer's patients. The linkage between the BZ recognition sites and the GABAA receptor-linked Cl− ionophore was functionally intact in these membranes as BZ site agonists (zolpidem, alpidem, flunitrazepam and clonazepam) enhanced [35S]TBPS binding under the conditions used (well-washed membranes in the presence of 1.0 M NaCl). Zolpidem (BZ1 selective) exhibited a biphasic enhancement in control membranes whereas the other compounds induced a bell-shaped concentration-response curve. The enhancement of [35S]TBPS binding by alpidem, flunitrazepam and clonazepam was greater in frontal cortex membranes from Alzheimer's patients than in controls whereas it tended to be reduced in membranes from the brains of Huntington's chorea patients. These studies demonstrate the functional integrity of the GABAA receptor macromolecular complex and also the usefulness of [35S]TBPS binding in the study of human postmortem tissue.

Url:
DOI: 10.1016/0014-2999(91)90361-S

Links to Exploration step

ISTEX:0A9C64FDFDDE488FB659612ABFEB2E432F72039D

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<div type="abstract" xml:lang="en">The functional integrity of the GABAA receptof-benzodiazepine (BZ) recognition site-Cl− ionophore complex was assessed by means of [35S]TBPS (t-butylbicyclophosphorothionate) binding to frontal cortex membranes prepared from frozen postmortem brain tissue taken from control (n = 4), Alzheimer (n = 7), Parkinson (n = 3) and Huntington's chorea (n = 2) patients. Specific [35S]TBPS binding was similar in control, Parkinson's disease and Huntington's chorea brains, but was significantly reduced (78% control, P < 0.01) in frontal cortex membranes from Alzheimer's patients. The linkage between the BZ recognition sites and the GABAA receptor-linked Cl− ionophore was functionally intact in these membranes as BZ site agonists (zolpidem, alpidem, flunitrazepam and clonazepam) enhanced [35S]TBPS binding under the conditions used (well-washed membranes in the presence of 1.0 M NaCl). Zolpidem (BZ1 selective) exhibited a biphasic enhancement in control membranes whereas the other compounds induced a bell-shaped concentration-response curve. The enhancement of [35S]TBPS binding by alpidem, flunitrazepam and clonazepam was greater in frontal cortex membranes from Alzheimer's patients than in controls whereas it tended to be reduced in membranes from the brains of Huntington's chorea patients. These studies demonstrate the functional integrity of the GABAA receptor macromolecular complex and also the usefulness of [35S]TBPS binding in the study of human postmortem tissue.</div>
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receptor complex function in frontal cortex membranes from control and neurological patients</ce:title>
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<ce:sup></ce:sup>
ionophore was functionally intact in these membranes as BZ site agonists (zolpidem, alpidem, flunitrazepam and clonazepam) enhanced [
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<ce:inf>A</ce:inf>
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<ce:sup loc="pre">35</ce:sup>
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<title>GAEAA receptor complex function in frontal cortex membranes from control and neurological patients</title>
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<title>GAEA</title>
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<name type="personal">
<namePart type="given">G.Kenneth</namePart>
<namePart type="family">Lloyd</namePart>
<affiliation>Synlhélabo Recherche (L.E.R.S.), 58 Rue de la Glaciere, 75013 Paris, France</affiliation>
<description>Correspondence to: G.K. Lloyd, Wyeth Laboratories, Huntercombe Lane South, Taplow, Maidenhead, Berkshire SL6 0PH, U.K..</description>
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<name type="personal">
<namePart type="given">Armand</namePart>
<namePart type="family">Lowenthal</namePart>
<affiliation>Algemeen Ziekenhuis Middleheim, 2020 Antwerpen, Belgium</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">France</namePart>
<namePart type="family">Javoy-Agid</namePart>
<affiliation>Hopital Pitié Salpêtrière, 75013 Paris, France</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">Jean</namePart>
<namePart type="family">Constantidinis</namePart>
<affiliation>Institutions Universitaires de Psychiatrie Genève (IUPG), 1225 Chène Bourg, Geneva, Switzerland</affiliation>
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<dateIssued encoding="w3cdtf">1991</dateIssued>
<dateValid encoding="w3cdtf">1991-02-05</dateValid>
<copyrightDate encoding="w3cdtf">1991</copyrightDate>
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<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
<languageTerm type="code" authority="rfc3066">en</languageTerm>
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<abstract lang="en">The functional integrity of the GABAA receptof-benzodiazepine (BZ) recognition site-Cl− ionophore complex was assessed by means of [35S]TBPS (t-butylbicyclophosphorothionate) binding to frontal cortex membranes prepared from frozen postmortem brain tissue taken from control (n = 4), Alzheimer (n = 7), Parkinson (n = 3) and Huntington's chorea (n = 2) patients. Specific [35S]TBPS binding was similar in control, Parkinson's disease and Huntington's chorea brains, but was significantly reduced (78% control, P < 0.01) in frontal cortex membranes from Alzheimer's patients. The linkage between the BZ recognition sites and the GABAA receptor-linked Cl− ionophore was functionally intact in these membranes as BZ site agonists (zolpidem, alpidem, flunitrazepam and clonazepam) enhanced [35S]TBPS binding under the conditions used (well-washed membranes in the presence of 1.0 M NaCl). Zolpidem (BZ1 selective) exhibited a biphasic enhancement in control membranes whereas the other compounds induced a bell-shaped concentration-response curve. The enhancement of [35S]TBPS binding by alpidem, flunitrazepam and clonazepam was greater in frontal cortex membranes from Alzheimer's patients than in controls whereas it tended to be reduced in membranes from the brains of Huntington's chorea patients. These studies demonstrate the functional integrity of the GABAA receptor macromolecular complex and also the usefulness of [35S]TBPS binding in the study of human postmortem tissue.</abstract>
<subject>
<genre>Keywords</genre>
<topic>GABAA receptor complex</topic>
<topic>Frontal cortex (human)</topic>
<topic>[35S]TBPS binding</topic>
<topic>Alzheimer's dementia</topic>
<topic>Parkinson's disease</topic>
<topic>Huntington's chorea</topic>
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<title>European Journal of Pharmacology</title>
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<title>EJP</title>
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<genre type="Journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">19910502</dateIssued>
</originInfo>
<identifier type="ISSN">0014-2999</identifier>
<identifier type="PII">S0014-2999(00)X0863-1</identifier>
<part>
<date>19910502</date>
<detail type="volume">
<number>197</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>1–2</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>1</start>
<end>116</end>
</extent>
<extent unit="pages">
<start>33</start>
<end>39</end>
</extent>
</part>
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<identifier type="istex">0A9C64FDFDDE488FB659612ABFEB2E432F72039D</identifier>
<identifier type="DOI">10.1016/0014-2999(91)90361-S</identifier>
<identifier type="PII">0014-2999(91)90361-S</identifier>
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