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  • Title: Lithium decreases 5-HT1A and 5-HT2 receptor and alpha 2-adrenoceptor mediated function in mice.
    Author: Goodwin GM, DeSouza RJ, Wood AJ, Green AR.
    Journal: Psychopharmacology (Berl); 1986; 90(4):482-7. PubMed ID: 3027734.
    Abstract:
    Lithium administration (LiCl, 10 mmol/kg, SC on day 1, followed by 3 mmol/kg twice daily subsequently) for 14 days to mice produced attenuation of the hypothermic response to injection of 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT, 0.5 mg/kg SC). Head twitch responses to the 5-HT-receptor agonist 5-methoxy-N,N-dimethyltryptamine (2.5 mg/kg IP) and to precursor loading with carbidopa (25 mg/kg, IP) and 5-hydroxytryptophan (100 mg/kg IP) were similarly attenuated. By contrast with this reduction of 5-hydroxytryptamine (5-HT) function mediated by the 5-HT1A and 5-HT2 receptor sub-types, repeated lithium administration had no effect on the motor response to a putative 5-HT1B receptor agonist 5-methoxy-3(1,2,3,6-tetrahydropyridin-4-yl)1H indole (RU 24969, 3 mg/kg IP). alpha 2 adrenoceptor function, assessed by the sedation response to clonidine (0.25 mg/kg, IP), was also attenuated by repeated lithium administration. It is proposed that these actions may explain the emergence of lithium as an adjunct to the treatment of refractory depressive illness.
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