• Leila Parsaei, Mahya Rangchiyan, Shamseddin Ahmadi, and Mohammad Reza Zarrindast.
• Department of Pharmacology and Iranian National Center for Addiction Studies, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran .
• Iran J Pharm Res. 2011 Jan 1; 10 (1): 127-34.

AbstractThese experiments examined the effects of pre-test intra dorsal hippocampus (intra-CA1) administration of GABAA receptor agonist and antagonist, muscimol and bicuculline respectively, on state-dependent learning induced by lithium. Male NMRI mice were trained in a one-trial step-down inhibitory avoidance task, and immediately after training they received IP injections of either saline (10 mL/kg) or lithium (10 mg/kg). The animals were tested for step-down latency, as an index of inhibitory avoidance memory, 24 h after the training. The results showed that lithium (10 mg/kg) induced state-dependent learning. Although the decrease of step down latency due to post-training lithium (10 mg/kg) was not fully reversed by a lower dose of lithium (5 mg/kg) but pre-test intra-CA1 injection of bicuculline (0.25 μg/mouse) increased the effect of the lower dose of lithium. Pre-test intra-CA1 injection of muscimol (0.05 μg/mouse) by itself reversed the decrease of step-down latency induced by post-training lithium (10 mg/kg). Pre-test intra-CA1 injection of muscimol (0.03 and 0.05 μg/mouse) also disrupted state-dependent learning induced by lithium (10 mg/kg). The results suggest that a GABAA receptor mechanism in the dorsal hippocampus is involved in state-dependent induced by lithium.

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