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• W2023160352 abstract "1 Previous experiments have suggested a potential atypical antipsychotic activity of the ergoline derivative LEK-8829. In vitro experiments showed a high affinity to 5-HT1A, 5-HT2 and D2 receptors (the ratio of pKi values 5-HT2/D2 = 1.11) and a moderate affinity to D1 receptors. In vivo experiments showed antagonism of dopamine and 5-hydroxytryptamine (5-HT) receptor-linked behaviours. 2 In the present study, the rats with unilateral dopaminergic deafferentation of the striatum, induced by the lesion of the median forebrain bundle with 6-hydroxydopamine (6-OHDA), were used to determine the effects of LEK-8829 on turning behaviour and on striatal c-fos mRNA levels. 3 The administration of LEK-8829 induced a long lasting contralateral turning behaviour that was dose-dependent. It was found that the specific D1 receptor antagonist SCH-23390 but not the D2 receptor antagonist haloperidol or 5-HT1A antagonist pindolol, dose-dependently inhibited the turning behaviour induced by LEK–8829. 4 In an attempt to clarify the D1:D2 receptor interactions involved in the action of LEK-8829 in the 6-OHDA model, we used in situ hybridization histochemistry to compare the effect of SCH-23390 pretreatment on striatal c-fos mRNA expression induced either by LEK-8829 or by the typical antipsychotic haloperidol. 5 LEK-8829 induced a bilateral striatal c-fos mRNA expression that was significantly higher in the denervated striatum as compared to the intact striatum and was completely blocked on both sides by pretreatment with SCH-23390. In contrast, haloperidol-induced striatal c-fos mRNA expression was limited to the innervated striatum and was not blocked by SCH-23390. 6 Our data demonstrate an intrinsic activity of LEK-8829 on D1 receptors that is potentiated in the dopamine-depleted striatum. We conclude, therefore, that the putative atypical antipsychotic LEK-8829 may prove useful as an experimental tool for the study of D1:D2 receptor interactions and could have beneficial effects in the treatment of drug-induced psychosis in patients with Parkinson's disease." @default.
• W2023160352 created "2016-06-24" @default.
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• W2023160352 date "1996-11-01" @default.
• W2023160352 modified "2023-10-18" @default.
• W2023160352 title "The D1 receptor-mediated effects of the ergoline derivative LEK-8829 in rats with unilateral 6-hydroxydopamine lesions" @default.
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• W2023160352 doi "https://doi.org/10.1111/j.1476-5381.1996.tb16021.x" @default.
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