GABA inhibition of somatostatin gene expression in cultured hypothalamic neurones.

Abstract:

:GABAA receptors mediate the inhibition of somatostatin release in hypothalamic neurones. To study the possible effect of GABA on somatostatin biosynthesis, somatostatin and preprosomatostatin mRNA levels were evaluated after exposure of hypothalamic neurones to muscimol or bicuculline. Muscimol (50 microM) decreased preprosomatostatin mRNA levels, by 25% after 4 h and 30% after 24 h treatment. Bicuculline (50 microM and 100 microM) increased preprosomatostatin mRNA levels by 1.4 and 1.5 fold after 4 h and by 1.3 and 1.7 fold after 24 h treatment. Somatostatin content was not modified after muscimol or bicuculline exposure. Total DNA content, used to control cellular viability, was not modified under any experimental conditions. Our findings suggest that the GABAergic inhibition of mRNA levels could be a consequence of the GABA inhibition of somatostatin release, thus allowing limited changes in peptide steady-state levels.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Rage F,Jalaguier S,Rougeot C,Tapia-Arancibia L

doi

10.1097/00001756-199303000-00024

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

320-2

issue

3

eissn

0959-4965

issn

1473-558X

journal_volume

4

pub_type

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