title: Prolonged ethanol inhalation decreases gamma-aminobutyric acidA receptor alpha subunit mRNAs in the rat cerebral cortex.
abstract: Ethanol administration to rats by ethanol vapor inhalation (14 days) results in a 40-50% reduction in the level of gamma-aminobutyric acidA (GABAA) receptor alpha 1 subunit mRNAs [4.4 and 4.8 kilobases (kb)] in the cerebral cortex. The level of alpha 2 subunit mRNA (8.0 kb) was also reduced by 29%, whereas there was no effect of prolonged ethanol exposure on the level of alpha 3 subunit mRNA (3.1 kb). Ethanol exposure did not alter the steady state levels of cerebral cortical glutamic acid decarboxylase or beta-actin mRNAs. Moreover, no alterations in the levels of total RNA, poly(A)+ RNA, or rRNA were observed, suggesting that the ethanol-induced reductions in GABAA receptor alpha 1 and alpha 2 subunit mRNAs were not the result of a generalized effect of ethanol administration on transcription or mRNA turnover. These ethanol-induced reductions in GABAA receptor alpha subunit mRNAs may underlie alterations in GABAA receptor function or number observed following prolonged ethanol exposure in rats.
authors.affiliation: Section of Molecular Pharmacology, National Institute of Mental Health, Bethesda, Maryland 20892.
authors.forename: P
authors.initials: P
authors.lastname: Montpied
authors.forename: A L
authors.initials: AL
authors.lastname: Morrow
authors.forename: J W
authors.initials: JW
authors.lastname: Karanian
authors.forename: E I
authors.initials: EI
authors.lastname: Ginns
authors.forename: B M
authors.initials: BM
authors.lastname: Martin
authors.forename: S M
authors.initials: SM
authors.lastname: Paul
mesh_terms: D000280:Administration, Inhalation; D000818:Animals; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure*; D000431:Ethanol / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D008566:Membranes / Q000378:metabolism; D009690:Nucleic Acid Conformation; D011061:Poly A / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011963:Receptors, GABA-A / Q000235:genetics*; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D012333:RNA, Messenger; D011963:Receptors, GABA-A; D011061:Poly A; D000431:Ethanol; D012313:RNA