title: Lithium decreases 5-HT1A and 5-HT2 receptor and alpha 2-adrenoceptor mediated function in mice.
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.
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001831:Body Temperature / Q000187:drug effects; D003000:Clonidine / Q000494:pharmacology; D007211:Indoles / Q000037:antagonists & inhibitors; D008094:Lithium / Q000097:blood / Q000494:pharmacology*; D008297:Male; D008732:Methoxydimethyltryptamines / Q000037:antagonists & inhibitors; D051379:Mice; D008810:Mice, Inbred C57BL; D009043:Motor Activity / Q000187:drug effects; D011942:Receptors, Adrenergic, alpha / Q000187:drug effects*; D011985:Receptors, Serotonin / Q000145:classification / Q000187:drug effects*; D013764:Tetrahydronaphthalenes / Q000037:antagonists & inhibitors
chemical_list: D007211:Indoles; D008732:Methoxydimethyltryptamines; D011942:Receptors, Adrenergic, alpha; D011985:Receptors, Serotonin; D013764:Tetrahydronaphthalenes; C025145:5-methoxy 3-(1,2,3,6-tetrahydro-4-pyridinyl)1H indole; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D008094:Lithium; D003000:Clonidine