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- W2026595308 abstract "In the present work, we investigated the effects of chronic risperidone administration on the activity of locus coeruleus noradrenergic neurons. In addition, the effect of chronic risperidone administration on the basal level of norepinephrine in the prefrontal cortex was evaluated. Results of this research showed that chronic risperidone administration increased the activity of locus coeruleus noradrenergic neurons. The sensitivity of alpha(2)-adrenoceptors in the somatodendritic region of the locus coeruleus was assessed by using the ID(50) of clonidine. Results indicated that the firing rate of locus coeruleus noradrenergic neurons was the same in risperidone-treated rats and controls. Similarly, the ID(50) for (+/-)-2,5-dimetoxy-4-iodoamphetamine (DOI), an agonist of 5-HT(2) receptors which inhibits the activity of locus coeruleus neurons by acting on these receptors, did not show any differences between the firing rate of these neurons in risperidone treated rats and controls. Unlike controls, chronically treated rats showed a significant decrease in norepinephrine levels in the prefrontal cortex. The decreased release of norepinephrine following continuous risperidone administration could be explained by the sustained increase in locus coeruleus neuronal activity after chronic risperidone administration. This low norepinephrine level in the prefrontal cortex may contribute to the relief of certain negative schizophrenic symptoms and to the improvement of cognitive function." @default.
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- W2026595308 date "2000-04-01" @default.
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- W2026595308 title "Effects of chronic risperidone on central noradrenergic transmission" @default.
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- W2026595308 doi "https://doi.org/10.1016/s0014-2999(00)00136-9" @default.
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