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Titolo:
REGULATION OF ADENYLYL-CYCLASE ISOZYMES ON ACUTE AND CHRONIC ACTIVATION OF INHIBITORY RECEPTORS
Autore:
NEVO I; AVIDORREISS T; LEVY R; BAYEWITCH M; HELDMAN E; VOGEL Z;
Indirizzi:
WEIZMANN INST SCI,DEPT NEUROBIOL IL-76100 REHOVOT ISRAEL WEIZMANN INST SCI,DEPT NEUROBIOL IL-76100 REHOVOT ISRAEL ISRAEL INST BIOL RES IL-74100 NESS ZIONA ISRAEL
Titolo Testata:
Molecular pharmacology
fascicolo: 2, volume: 54, anno: 1998,
pagine: 419 - 426
SICI:
0026-895X(1998)54:2<419:ROAIOA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHRONIC OPIOID TREATMENT; BETA-GAMMA-SUBUNITS; RAT OLFACTORY-BULB; CELLS; DESENSITIZATION; STIMULATION; NG108-15; SUPERSENSITIVITY; SENSITIZATION; MODULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
I. Nevo et al., "REGULATION OF ADENYLYL-CYCLASE ISOZYMES ON ACUTE AND CHRONIC ACTIVATION OF INHIBITORY RECEPTORS", Molecular pharmacology, 54(2), 1998, pp. 419-426

Abstract

Adenylyl cyclase superactivation, a phenomenon by which chronic activation of inhibitory G(i/o)-coupled receptors leads to an increase in cAMP accumulation, is believed to play an important role as a compensatory response of the cAMP signaling system in the cell. However, to date, the mechanism by which adenylyl cyclase activity is regulated by chronic exposure to inhibitory agonists and the nature of the adenylyl cyclase isozymes participating in this process remain largely unknown. Here we show, using COS-7 cells transfected with the various AC isozymes, that acute activation of the D-2 dopaminergic and m4 muscarinic receptors inhibited the activity of adenylyl cyclase isozymes I, V, VI, and VIII, whereas types II, IV, and VII were stimulated and type III was not affected. Conversely, chronic receptor activation led to superactivation of adenylyl cyclase types I, V, VI, and VIII and to a reduction in the activities of types II, IV, and VII. The activity of AC-IIIalso was reduced. This pattern of inhibition/stimulation of the various adenylyl cyclase isozymes is similar to that we recently observed on acute and chronic activation of the mu-opioid receptor, suggesting that isozyme-specific adenylyl cyclase superactivation may represent a general means of cellular adaptation to the activation of inhibitory receptors and that the presence/absence and intensity of the adenylyl cyclase response in different brain areas (or cell types) could be explained by the expression of different adenylyl cyclase isozyme types inthese areas.

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Documento generato il 15/07/20 alle ore 05:32:22