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Titolo:
Hypothalamic CRH mRNA levels are differentially modulated by repeated 'binge' cocaine with or without D-1 dopamine receptor blockade
Autore:
Zhou, Y; Spangler, R; Ho, A; Kreek, MJ;
Indirizzi:
Rockefeller Univ, Lab Biol Addict Dis, New York, NY 10021 USA Rockefeller Univ New York NY USA 10021 Addict Dis, New York, NY 10021 USA
Titolo Testata:
MOLECULAR BRAIN RESEARCH
fascicolo: 1-2, volume: 94, anno: 2001,
pagine: 112 - 118
SICI:
0169-328X(20011019)94:1-2<112:HCMLAD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORTICOTROPIN-RELEASING HORMONE; MESSENGER-RNA LEVELS; PITUITARY-ADRENAL AXIS; RAT-BRAIN; PARAVENTRICULAR NUCLEUS; CORTICOSTERONE LEVELS; ANTERIOR-PITUITARY; ACTH-SECRETION; NEURONS; LOCALIZATION;
Keywords:
SCH23390; sulpiride; 'binge' cocaine; CRH; hypothalamus; dopamine receptor;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Zhou, Y Rockefeller Univ, Lab Biol Addict Dis, 1230 York Ave, New York, NY10021 USA Rockefeller Univ 1230 York Ave New York NY USA 10021 NY 10021 USA
Citazione:
Y. Zhou et al., "Hypothalamic CRH mRNA levels are differentially modulated by repeated 'binge' cocaine with or without D-1 dopamine receptor blockade", MOL BRAIN R, 94(1-2), 2001, pp. 112-118

Abstract

We previously found that there was a rapid stimulatory effect of acute (I day) 'binge' cocaine on CRH mRNA levels in the rat hypothalamus. In contrast, after 3 days of 'binge' cocaine, there was a modest decrease (12%) in hypothalamic CRH mRNA levels, which after 14 days of 'binge' cocaine was greater (32%) and significantly lower than control values. Also, our previous studies found an elevation of CRH mRNA in the frontal cortex after 3 days of'binge' cocaine. The present study was designed to investigate the possible role of dopamine receptors in modulating these effects. Administration of3 days of 'binge' cocaine (3 X 15 mg/kg i.p.) was preceded by daily injections of either D-1 (SCH23390, 2 mg/kg) or D-2 (sulpiride, 50 mg/kg) dopamine receptor antagonist. Neither SCH23390 nor sulpiride had an effect on basal CRH mRNA levels in the hypothalamus, frontal cortex or amygdala. Small decreases (10-13%) in hypothalamic CRH mRNA levels were found again to be induced by 3 days of repeated 'binge' cocaine. However, this modest decrease was not found in the rats that received D-1 antagonist SCH23390 pretreatment. Pretreatment with D-2 antagonist sulpiride had no effect on this decrease. These findings suggest that the inhibitory effect of repeated 'binge' cocaine on the hypothalamic CRH rnRNA expression is absent when there is D-1, but not D-2, dopamine receptor blockade. In the frontal cortex, pretreatment with either SCH23390 or sulpiride did not alter the increases in the CRH mRNA levels induced by repeated 'binge' cocaine. The results suggest that the cocaine-induced modulation of hypothalamic CRH mRNA expression is secondary to changes in the activity of specific components of dopaminergic systems. (C) 2001 Elsevier Science BY All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 08:48:35