Antidepressant Drugs Inhibit Glucocorticoid Receptor-mediated Gene Transcription - a Possible Mechanism

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 2000 Jul 25

PMID 10903980

Citations 21

Authors

B Budziszewska

L Jaworska-Feil

M Kajta

W Lason

Affiliations

Soon will be listed here.

Abstract

1. Antidepressant drugs are known to inhibit some changes evoked by glucocorticoids, as well as a hyperactivity of hypothalamic-pituitary-adrenal (HPA) axis, often observed in depression. 2. The aim of present study was to investigate effects of various antidepressant drugs on the glucocorticoid-mediated gene transcription in fibroblast cells, stably transfected with an MMTV promoter (LMCAT cells). 3. The present study have shown that antidepressants (imipramine, amitriptyline, desipramine, fluoxetine, tianeptine, mianserin and moclobemide), but not cocaine, inhibit the corticosterone-induced gene transcription in a concentration- and a time-dependent manner. 4. Drugs which are known to augment clinical effects of medication in depressed patients (lithium chloride, amantadine, memantine), do not affect the inhibitory effects of imipramine on the glucocorticoid receptor (GR)-mediated gene transcription. 5. Inhibitors of phospholipase C (PLC), protein kinase C (PKC), Ca(2+)/calmodulin-dependent protein kinase (CaMK) and antagonists of the L-type Ca(2+) channel also inhibit the corticosterone-induced gene transcription. 6. Inhibitors of protein kinase A (PKA) and protein kinase G (PKG) are without effect on the GR-induced gene transcription. 7. Phorbol ester (an activator of PKC) attenuates the inhibitory effect of imipramine on the GR-induced gene transcription. 8. Imipramine decreases binding of corticosterone-receptor complex to DNA. 9. It is concluded that antidepressant drugs inhibit the corticosterone-induced gene transcription, and that the inhibitory effect of imipramine depends partly on the PLC/PKC pathway.

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