Introduction: Stimulation or inactivation of the lateral hypothalamus (LH) produces antinociception. Studies showed a role for the ventral tegmental area (VTA) in the antinociception induced by LH chemical stimulation through the orexinergic receptors. In this study, we assessed the role of intra-VTA dopamine D1 and D2 receptors in antinociceptive effects of cholinergic agonist, carbachol, m...

Direct effects of dopamine on renin release were examined using static incubations and perifusions of rat renal cortical slices. Dopamine (10(-5)M) significantly stimulated renin release compared with control. To determine which receptors are involved in dopamine-elicited renin release, studies were performed with specific dopamine-1 and dopamine-2 receptor agonists and antagonists, as well as ...

the regulation of dopamine and serotonin synthesis in rat brain striatal synaptosomes has been studied using hplc methods. noradrenaline was shown to markedly inhibit both the synthesis of dopamine and serotonin. the response of the synaptosomes to the concentrations of noradrenaline appeared to be biphasic, a very effective inhibition occurring at low concentrations (1-5 µm) and a relatively i...

Dopamine receptor D2, also known asD2R, is a protein that, in humans, is encoded by the DRD2 gene.The dopamine D2 receptor was discovered in 1975 by Philip Seeman who had named it as the antipsychotic/dopamine receptor [1] The dopamine D2 receptor is the main receptor for all antipsychotic drugs. Any drug that does not interfere with dopamine action at the D2 receptor does not have an antipsych...

Dopamine regulates the psychomotor stimulant activities of amphetamine-like substances in the brain. The effects of dopamine are mediated through five known dopamine receptor subtypes in mammals. The functional relevance of D5 dopamine receptors in the central nervous system is not well understood. To determine the functional relevance of D5 dopamine receptors, we created D5 dopamine receptor-d...

The dopamine receptors have been classified into two groups, the D1like and D2-like dopamine receptors, respectively, based on molecular biology and pharmacological studies. The D1-like dopamine receptors comprise the D1 and D5 dopamine receptors and the D2-like dopamine receptors include the D2, D3 and D4 dopamine receptors. The gene structures of these two classes of receptors are dissimilar ...

Chronic interruption of the nigrostriatal dopaminergic pathway leads to sensitized dopaminergic responses in striatum. We attempted to explore the mechanism(s) underlying this dopaminergic supersensitivity by assessing dopamine receptor signaling and receptor-G protein coupling in unilateral 6-hydroxydopamine-lesioned rats. Dopamine-stimulated adenylyl cyclase activity as well as dopamine-activ...