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- W2036552054 abstract "Brain alpha(1)-adrenoceptors are known to be necessary for motor activity in rodents and have been shown to be altered by stress and corticosteroids but only in biochemical experiments. To determine if the behaviorally coupled receptors are also affected by stress, the present study examined the effect of stress and corticosteroids treatment on the motor activity response to modafinil, a putative alpha(1)-adrenoceptor agonist, which is unique in that it elicits extremely high levels of activity via these receptors. Mice were subjected to various schedules of restraint stress for 1-6 days and were subsequently tested for either modafinil-induced or dopaminergically induced behavioral activity in the home cage using videotape recording. In experiments on corticosteroid treatment, mice received exogenous corticosterone or dexamethasone in the drinking water before and during the stress and were tested for modafinil-induced activity as above. It was found that the stress significantly reduced the response to the drug by the third daily session. Motor responses to dopaminergic agents including apomorphine, amphetamine, dihydrexidine and quinpirole were either not altered or were increased at this time. Treatment of animals with corticosterone or dexamethasone prior to and during stress prevented the behavioral subsensitivity to modafinil. Corticosterone pretreatment markedly suppressed the plasma corticosterone response to the stress. The present results provide further support for the hypothesis that stress produces a selective desensitization or inhibition of motor-related brain alpha(1)-adrenoceptors and that this effect can be prevented by corticosteroid treatment." @default.
- W2036552054 created "2016-06-24" @default.
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- W2036552054 date "2002-11-01" @default.
- W2036552054 modified "2023-10-16" @default.
- W2036552054 title "Stress-induced subsensitivity to modafinil and its prevention by corticosteroids" @default.
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- W2036552054 doi "https://doi.org/10.1016/s0091-3057(02)00962-0" @default.
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