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Titolo:
STIMULATION OF ADENYLATE-CYCLASE ACTIVITY BY BENZAZEPINE D-1 DOPAMINEAGONISTS WITH VARYING EFFICACIES IN THE 6-HYDROXYDOPAMINE LESIONED RAT-RELATIONSHIP TO CIRCLING BEHAVIOR
Autore:
GNANALINGHAM KK; HUNTER AJ; JENNER P; MARSDEN CD;
Indirizzi:
UNIV LONDON KINGS COLL,DIV BIOMED SCI,PHARMACOL GRP,EXPTL RES LABS,PARKINSONS DIS SOC LONDON SW3 6LX ENGLAND UNIV LONDON KINGS COLL,DIV BIOMED SCI,PHARMACOL GRP,EXPTL RES LABS,PARKINSONS DIS SOC LONDON SW3 6LX ENGLAND SMITHKLINE BEECHAM PHARMACEUT HARLOW CM19 5AD ESSEX ENGLAND UNIV LONDON,NATL HOSP NEUROL,DEPT CLIN NEUROL LONDON ENGLAND
Titolo Testata:
Biochemical pharmacology
fascicolo: 9, volume: 49, anno: 1995,
pagine: 1185 - 1193
SICI:
0006-2952(1995)49:9<1185:SOAABB>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPER-SENSITIVITY; SUBSTANTIA-NIGRA; DENERVATION SUPERSENSITIVITY; RECEPTOR SUPERSENSITIVITY; D1-DOPAMINE RECEPTOR; ROTATIONAL BEHAVIOR; FUNCTIONAL RECOVERY; CAUDATE-NUCLEUS; D2 RECEPTORS; D1;
Keywords:
ADENYLATE CYCLASE; D-1 DOPAMINE AGONISTS; BENZAZEPINES; RAT; 6-HYDROXYDOPAMINE; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
52
Recensione:
Indirizzi per estratti:
Citazione:
K.K. Gnanalingham et al., "STIMULATION OF ADENYLATE-CYCLASE ACTIVITY BY BENZAZEPINE D-1 DOPAMINEAGONISTS WITH VARYING EFFICACIES IN THE 6-HYDROXYDOPAMINE LESIONED RAT-RELATIONSHIP TO CIRCLING BEHAVIOR", Biochemical pharmacology, 49(9), 1995, pp. 1185-1193

Abstract

The ability of benzazepine D-1 dopamine agonists with varying efficacies in stimulating adenylate cyclase and to induce contralateral circling was investigated in rats with unilateral 6-hydroxydopamine lesionsof the medial forebrain bundle. In the 6-hydroxydopamine lesioned rats, the benzazepines SKF 38393 oxy-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine), SKF 75670 (3-CH3 analogue), SKF 80723 (6-Br analogue), SKF 83959 (6-Cl, 3-CH3, 3'-CH3 analogue), SKF 83565 (6-Cl, 3-CH3, 3'-Cl analogue) and SKF 82958 (6-Cl, 3-C3H5 analogue), all produced contralateral circling. The rank order of efficacies (maximal effect, E(max)) being, SKF 83565 = SKF 75670 = SKF 83959 = SKF 80723 > SKF 38393 much greater than SKF 82958. In striatal slices from the intact hemisphere, dopamine, SKF 82958, SKF 80723 and SKF 75670 stimulated adenylate cyclase activity. The rank order of efficacies being SKF 82958 (109%) = dopamine (100%) = SKF 80723 (98%) > SKF 75670 (72%). Although, SKF 38393 (67%), SKF 83565 (64%) and SKF 83959 (59%) tended to stimulate adenylate cyclase activity, this effect did not reach statistical significance. In the 6-hydroxydopamine lesioned hemisphere, basal levels of adenylate cyclase activity were lower (-25%) than in the intact hemisphere. The maximal stimulation of adenylate cyclase activity (expressed as %basal levels) produced by dopamine and the benzazepines in the denervated striatum was greater than observed in the intact striatum. The rank order of efficacies in the dopamine denervated striatum being SKF 82958 (124%) > SKF 80723 (109%) = dopamine (100%) > SKF 38393 (82%) = SKF 83959 (77%) = SKF 83565 (70%) > SKF 75670 (55%). Moreover, dopaminestimulated adenylate cyclase activity in the denervated striatum withgreater potency than in the intact side. The ability of the benzazepine derivatives to induce circling in the 6-hydroxydopamine lesioned rat is consistent with the general increase in the efficacies of dopamine and benzazepine stimulated adenylate cyclase activity in the dopamine denervated striatum. However, the maximal effects for inducing circling and stimulating adenylate cyclase activity do not correspond (e.g. SKF 82958 and SKF 75670). This discrepancy may reflect the involvement of other factors including a behavioural role for extrastriatal D-1 dopamine receptors and/or transduction systems other than adenylate cyclase.

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Documento generato il 04/04/20 alle ore 15:20:19