Nothdurfter, Caroline and Tanasic, Sascha and Di Benedetto, Barbara and Uhr, Manfred and Wagner, Eva-Maria and Gilling, Kate E. and Parsons, Chris G. and Rein, Theo and Holsboer, Florian and Rupprecht, Rainer and Rammes, Gerhard (2013) Lipid raft integrity affects GABA(A) receptor, but not NMDA receptor modulation by psychopharmacological compounds. INTERNATIONAL JOURNAL OF NEUROPSYCHOPHARMACOLOGY, 16 (6). pp. 1361-1371. ISSN 1461-1457, 1469-5111
Full text not available from this repository. (Request a copy)Abstract
Lipid rafts have been shown to play an important role for G-protein mediated signal transduction and the function of ligand-gated ion channels including their modulation by psychopharmacological compounds. In this study, we investigated the functional significance of the membrane distribution of NMDA and GABA(A) receptor subunits in relation to the accumulation of the tricyclic antidepressant desipramine (DMI) and the benzodiazepine diazepam (Diaz). In the presence of Triton X-100, which allowed proper separation of the lipid raft marker proteins caveolin-1 and flotillin-1 from the transferrin receptor, all receptor subunits were shifted to the non-raft fractions. In contrast, under detergent-free conditions, NMDA and GABAA receptor subunits were detected both in raft and non-raft fractions. Diaz was enriched in non-raft fractions without Triton X-100 in contrast to DMI, which preferentially accumulated in lipid rafts. Impairment of lipid raft integrity by methyl-beta-cyclodextrine (MbCD)-induced cholesterol depletion did not change the inhibitory effect of DMI at the NMDA receptor, whereas it enhanced the potentiating effect of Diaz at the GABAA receptor at non-saturating concentrations of GABA. These results support the hypothesis that the interaction of benzodiazepines with the GABAA receptor likely occurs outside of lipid rafts while the antidepressant DMI acts on ionotropic receptors both within and outside these membrane microdomains.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GPI-ANCHORED PROTEINS; PLASMA-MEMBRANE; TRICYCLIC ANTIDEPRESSANTS; 5-HT3 RECEPTOR; GS-ALPHA; CAVEOLAE; MICRODOMAINS; DOMAINS; LOCALIZATION; REVEALS; Antidepressants; benzodiazepines; GABA(A) receptor; lipid rafts; NMDA receptor |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Psychiatrie und Psychotherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 10:36 |
| Last Modified: | 07 Apr 2020 10:36 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16477 |
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