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Abstract
The in vitro and ex vivo effects of lithium on muscarinic cholinergic inositol phospholipid hydrolysis and muscarinic cholinergic inhibition of dopamine D1-receptor-stimulated cyclic AMP formation were examined in rat brain slices. Following chronic lithium feeding, carbachol-stimulated inositol phosphate accumulation was reduced ex vivo in slices of cerebral cortex but not in striatal slices. Lithium (1 mM) in vitro had no direct effect on dopamine D1-receptor-stimulated cyclic AMP formation, but enhanced the inhibitory effect of carbachol on the D1 response, in striatal slices, and this was not significantly altered by prior lithium feeding. Lithium therefore has effects on two discrete muscarinic responses in rat brain which are apparently maintained after chronic exposure to the ion and might be relevant to its antimanic actions.
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