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Verfasst von:Zink, Mathias [VerfasserIn]   i
 Schmitt, Andrea [VerfasserIn]   i
 May, Brigitte [VerfasserIn]   i
 Müller, Bettina [VerfasserIn]   i
 Demirakça, Traute [VerfasserIn]   i
 Braus, Dieter F. [VerfasserIn]   i
 Henn, Fritz A. [VerfasserIn]   i
Titel:Differential effects of long-term treatment with clozapine or haloperidol on GABAA receptor binding and GAD67 expression
Verf.angabe:Mathias Zink, Andrea Schmitt, Brigitte May, Bettina Müller, Traute Demirakca, Dieter F. Braus, Fritz A. Henn
Jahr:2004
Umfang:7 S.
Fussnoten:Online veröffentlicht: 23. Mai 2003 ; Gesehen am 03.11.2020
Titel Quelle:Enthalten in: Schizophrenia research
Ort Quelle:Amsterdam [u.a.] : Elsevier Science, 1988
Jahr Quelle:2004
Band/Heft Quelle:66(2004), 2, Seite 151-157
ISSN Quelle:1573-2509
Abstract:One of the most consistent findings in postmortem studies of schizophrenia is increased GABAA receptor binding and reduced glutamic acid decarboxylase (GAD67) expression. Due to long-term antipsychotic treatment before death, these findings may reflect not only the consequences of schizophrenia but also medication effects. To differentiate between these options, we used an animal model and evaluated long-term effects of typical (haloperidol) and atypical (clozapine) antipsychotic drugs on the GABAergic system. A total of 33 adult male rats were treated in three cohorts over a period of 6 months. One cohort of 11 animals received clozapine (45 mg/kg/day), another one received haloperidol (1.5 mg/kg/day) and a third one received pH-adapted minimal concentrations of HCl in the drinking water. Receptor autoradiography of the GABAA receptor ([3H]-muscimol binding) and in situ hybridization in adjacent sections with 35S-labeled cRNA probes of the γ-aminobutyric acid (GABA)-producing enzyme, GAD67, was performed. While haloperidol increased GABAA receptor binding in striatum and nucleus accumbens (NA), it suppressed GABAA receptor binding in temporal (TEMPC) and parietal (PARC) cortex. Clozapine induced GABAA receptor binding in infralimbic cortex (ILC) and similar like haloperidol in anterior cingulate cortex (ACC), two regions of the limbic cortex. In addition, either drug increased gene expression of GAD67. It is concluded that antipsychotic drugs differentially alter the GABAergic system, strongly suggesting that drug effects are partially responsible for the up-regulation of GABAA receptor binding in certain brain regions as observed in postmortem brains of schizophrenic patients. However, the reduced GAD67 expression seen in postmortem brains does not appear to reflect drug effects, since our animal model demonstrated increased gene expression.
DOI:doi:10.1016/S0920-9964(03)00088-4
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1016/S0920-9964(03)00088-4
 Volltext: http://www.sciencedirect.com/science/article/pii/S0920996403000884
 DOI: https://doi.org/10.1016/S0920-9964(03)00088-4
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Clozapine
 GABA
 GABA receptor
 GAD
 Haloperidol
 Schizophrenia
K10plus-PPN:1737591626
Verknüpfungen:→ Zeitschrift

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