apomorphine/cannabis

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Potentiation of penile erection and yawning responses to apomorphine by cannabinoid receptor antagonist in rats.

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The effect of systemic administration of the cannabinoid antagonist SR 141716A (N-(piperidin-1-yl)-5-(4-chlorophenyl)-4-methyl-1H-pyrazole-3-carboxyamide) on penile erection and yawning induced by apomorphine was investigated in rats. SR 141716A (2 mg/kg, i.p.) administered 40 min before apomorphine

SR 141716A, a CB1 cannabinoid receptor antagonist, potentiates the locomotor stimulant effects of amphetamine and apomorphine.

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The intraperitoneal (i.p.) injection of apomorphine or d-amphetamine significantly increased locomotor activity in Sprague-Dawley rats. Prior administration of the cannabinoid receptor antagonist, SR 141716A, significantly enhanced the stimulant effect of both d-amphetamine and apomorphine in a

Effects of cannabinoids infused into the dorsal hippocampus upon memory formation in 3-days apomorphine-treated rats.

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In the present study, the effects of intra-dorsal hippocampus (intra-CA1) injection of cannabinoid receptor agents on memory formation have been investigated in 3-days apomorphine-treated rats. Step-through inhibitory avoidance task of memory has been used to examine retrieval of memory formation,

Cannabis, catecholamines, rapid eye movement sleep and aggressive behaviour.

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1. Previous work from our laboratory has shown that cannabis induces aggressive behaviour in rats that have been deprived of rapid eye movement (REM) sleep. It was suggested that this effect was related to brain catecholamines, with dopamine playing an agonist role and noradrenaline an inhibitory

Involvement of dopaminergic and glutamatergic systems of the basolateral amygdala in amnesia induced by the stimulation of dorsal hippocampal cannabinoid receptors.

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The present study intended to investigate the involvement of dopaminergic and glutamatergic systems of the basolateral amygdala in amnesia induced by the stimulation of dorsal hippocampal cannabinoid receptors in male Wistar rats. The animals were stereotaxically implanted with guide cannulas in the

The CB1 cannabinoid receptor agonist, HU-210, reduces levodopa-induced rotations in 6-hydroxydopamine-lesioned rats.

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Parkinson's disease is a chronic neurodegenerative disease of the extrapyramidal system associated with dopaminergic neuronal loss in the basal ganglia. However, several other neurotransmitters, such as serotonin, gamma-amino-butyric acid and glutamate, are also related to the symptoms of

Differential cannabinoid-induced electrophysiological effects in rat ventral tegmentum.

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Cannabinoids are known to exert mainly excitatory effects on dopaminergic cells of the ventral tegmental area (VTA). We have utilized an in vivo multiple-single unit electrophysiological approach to assess different neuronal contributions that may ultimately lead to excitation in this area. Baseline

Cannabinoid CB(1) receptor agonists produce cerebellar dysfunction in mice.

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The purpose of these studies was to characterize the effects of agonists of the CB(1) cannabinoid receptor on cerebellar function in mice. We used two measures specific for cerebellar function: gait analysis and the bar cross test. CB(1) receptor agonists CP55940, Win 55212-2,

The CB1 cannabinoid receptor antagonist SR 141716A affects A9 dopamine neuronal activity in the rat.

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CB1 receptors and their putative natural ligand anandamide, have been tentatively involved in the control of midbrain extrapyramidal function. Electrophysiological activity of dopamine neurones was measured after acute and repeated administration of the CB1 receptor antagonist SR 141716A (0.3-3 mg

Prenatal exposure to a cannabinoid receptor agonist does not affect sensorimotor gating in rats.

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Clinical evidence suggests that prenatal exposure to cannabis may be conducive to long-term neurobehavioral impairments in executive and attentional domains. Such sensorimotor alterations might be related to disorders in gating functions. Hence, the present study was undertaken to assess the effects

Acute or chronic effects of cannabinoids on spontaneous or pharmacologically induced yawning in rats.

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Yawning is a reflex or event that is not fully understood. It is controlled by many neurotransmitters and neuropeptides and can be induced pharmacologically by cholinergic or dopaminergic agonists. Amongst their many actions, cannabinoids acting on cannabinoid (CB(1) or CB(2)) receptors can alter

Behavioural disturbances and altered Fos protein expression in adult rats after chronic pubertal cannabinoid treatment.

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Cannabis is one of the world's most popular recreational drugs. However, little is known about long-lasting cellular and neurobehavioural effects of chronic cannabinoid intake, especially during puberty where cannabis use among humans is commonly initiated. This study in rats investigates the

Dopaminergic regulation of cannabinoid receptor mRNA levels in the rat caudate-putamen: an in situ hybridization study.

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By quantitative in situ hybridization, we examined in vivo in the rat caudate-putamen the effects on levels of cannabinoid receptor mRNA of an interruption of dopamine neurotransmission for up to 1 month, by either 6-hydroxydopamine lesioning of the medial forebrain bundle or dopamine receptor

Effects of cannabinoid receptor ligands on psychosis-relevant behavior models in the rat.

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BACKGROUND Marijuana is known to have psychotropic effects in humans. In this study, we used rat models of sensorimotor gating, hyperactivity and stereotypy to explore whether CB(1) receptor stimulation or blockade induces behavioral changes consistent with psychotomimetic or antipsychotic agents,

Cannabinoid receptor antagonists counteract sensorimotor gating deficits in the phencyclidine model of psychosis.

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Clinical and laboratory findings suggest that cannabinoids and their receptors are implicated in schizophrenia. The role of cannabinoids in schizophrenia remains however poorly understood, as data are often contradictory. The primary aim of this study was to investigate whether the cannabinoid CB1

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