Summary
The acute (1 h, i. p.) and chronic (14 days, p. o.) effects of LiCl treatment upon GABA-ergic neurons were studied in the rat corpus striatum and frontal cerebral cortex.
One hour after a single injection of LiCl the activity of glutamic acid decarboxylase (GAD) was reduced by 29% in the striatum (2 meq/kg LiCl) and by 38% in the cerebral cortex (10 meq/kg LiCl). In contrast, striatal GAD was activated by 34% 1 h after the injection of 10 meq/kg of LiCl; this dose also reduced the endogenous striatal GABA level by 24%.
After 14 days of oral LiCl administration (2 meq/kg/day): a) cortical GAD activity was enhanced by 50% and GABA concentration was decreased by 28%; b) no changes were observed in the striatum.
These findings suggest that: LiCl administration stimulates GABA-ergic function in specific areas (depending on the dose and length of treatment) increasing both GAD activity and probably GABA release. This occurs in the striatum after acute treatment only with a high dose, and in the frontal cerebral cortex after chronic treatment with a low dose.
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Otero Losada, M.E., Rubio, M.C. Acute and chronic effects of lithium chloride on GABA-ergic function in the rat corpus striatum and frontal cerebral cortex. Naunyn-Schmiedeberg's Arch. Pharmacol. 332, 169–172 (1986). https://doi.org/10.1007/BF00511408
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DOI: https://doi.org/10.1007/BF00511408