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Cannabinoid suppressed bicuculline-induced convulsion without respiratory depression in the brainstem-spinal cord preparation from newborn rats.

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Previous studies have suggested that cannabinoid compounds are anticonvulsants and that these compounds depress respiratory activity. However, the anticonvulsant potential of cannabinoids and their depressive effect on respiration have not been evaluated simultaneously. In the present study, we used

Dissociation between the panicolytic effect of cannabidiol microinjected into the substantia nigra, pars reticulata, and fear-induced antinociception elicited by bicuculline administration in deep layers of the superior colliculus: The role of CB1-cannabinoid receptor in the ventral mesencephalon.

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Many studies suggest that the substantia nigra, pars reticulata (SNpr), a tegmental mesencephalic structure rich in γ-aminobutyric acid (GABA)- and cannabinoid receptor-containing neurons, is involved in the complex control of defensive responses through the neostriatum-nigral disinhibitory and

Dorsal hippocampus cannabinoid type 1 receptors modulate the expression of contextual fear conditioning in rats: Involvement of local glutamatergic/nitrergic and GABAergic neurotransmissions.

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The cannabinoid receptor type 1 (CB1) is highly expressed in the dorsal portion of hippocampus - a brain region that has been involved in the control of conditioned emotional response (CER) in the contextual fear conditioning (CFC) model. These responses are characterized by increased freezing

Protective effects of cannabinoid receptor agonists against cocaine and other convulsant-induced toxic behavioural symptoms.

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Based on the previously reported co-localization and relationship between cannabinoid and dopamine receptors, the effects of cannabinoid receptor agonists against cocaine-induced toxic behavioural symptoms, including convulsive seizures, were examined in mice. The anticonvulsant effect of several

Neurochemical evidence that stimulation of CB1 cannabinoid receptors on GABAergic nerve terminals activates the dopaminergic reward system by increasing dopamine release in the rat nucleus accumbens.

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We examined the effect of cannabinoid receptor activation on basal and electrical field simulation-evoked (25 V, 2 Hz, 240 shocks) [(3)H]dopamine efflux in the isolated rat nucleus accumbens in a preparation, in which any effect on the dendrites or somata of ventral tegmental projection neurons was

Lack of response suppression follows repeated ventral tegmental cannabinoid administration: an in vitro electrophysiological study.

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Cannabinoid compounds have been reported to excite ventral tegmental neurons through activation of cannabinoid CB1 receptors. More recently, biochemical and whole-cell voltage-clamp studies carried out on CB1-transfected AtT20 cells have shown a rapid desensitization of these receptors following

Local effects of cannabinoids on spontaneous activity and evoked inhibition in the globus pallidus.

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The globus pallidus has been identified as a site of action for the motor effects of cannabinoids. A previous report from this laboratory demonstrated that systemic administration of the potent and selective cannabinoid receptor agonist (R)-(+)-[2,3-dihydro-5-methyl-3-[(4-morpholinyl)

Cannabinoid modulation of neuronal function after oxygen/glucose deprivation in area CA1 of the rat hippocampus.

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Endocannabinoids released during cerebral ischemia have been implicated as neuroprotective agents. We assessed the role of cannabinoid receptors in modulating the response of neurons to oxygen/glucose deprivation (OGD), a model for in vitro ischemia, in rat hippocampal slices using extracellular

Presynaptic mechanisms underlying cannabinoid inhibition of excitatory synaptic transmission in rat striatal neurons.

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The striatum is a crucial site of action for the motor effects of cannabinoids (CBs). However, the electrophysiological consequences of activation of CB receptors on the striatal neurons have not been established. Here we report for the first time that the cannabimimetic aminoalkylindole WIN

Role of the subthalamic nucleus in cannabinoid actions in the substantia nigra of the rat.

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The effect of cannabinoids on the excitatory input to the substantia nigra reticulata (SNr) from the subthalamic nucleus was explored. For this purpose a knife cut was performed rostral to the subthalamic nucleus to isolate the subthalamic nucleus and the SNr from the striatum, a major source of

GABAA receptors modulate cannabinoid-evoked hypothermia.

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Cannabinoids evoke hypothermia by stimulating central CB(1) receptors. GABA induces hypothermia via GABA(A) or GABA(B) receptor activation. CB(1) receptor activation increases GABA release in the hypothalamus, a central locus for thermoregulation, suggesting that cannabinoid and GABA systems may be

CB1 cannabinoid receptor-mediated anandamide signalling reduces the defensive behaviour evoked through GABAA receptor blockade in the dorsomedial division of the ventromedial hypothalamus.

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The effects of cannabinoids in brain areas expressing cannabinoid receptors, such as hypothalamic nuclei, are not yet well known. Several studies have demonstrated the role of hypothalamic nuclei in the organisation of behavioural responses induced through innate fear and panic attacks. Panic-prone

Local pressure application of cannabinoid agonists increases spontaneous activity of rat substantia nigra pars reticulata neurons without affecting response to iontophoretically-applied GABA.

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This study tested the hypothesis that cannabinoid agonists, applied locally into the pars reticulata of substantia nigra (SNpr), could modulate striatonigral transmission, without affecting the response of SNpr neurons to iontophoretically-applied GABA. Multibarreled glass capillary electrode

Cannabinoids inhibit excitatory neurotransmission in the substantia nigra pars reticulata.

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The substantia nigra pars reticulata belongs to the brain regions with the highest density of CB(1) cannabinoid receptors. Since the level of CB(1) receptor messenger RNA is very low in the pars reticulata, most of the receptors are probably localized on terminals of afferent axons. The hypothesis

Cannabinoid receptor activation in CA1 pyramidal cells in adult rat hippocampus.

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Intracellular assessments of the physiological actions of cannabinoid receptor agonists and antagonists on adult hippocampal CA1 pyramidal cells in the in vitro slice preparation were performed using current clamp and conventional sharp-electrode intracellular recording procedures. Several

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