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- W2064252404 abstract "Three series of studies were conducted to specify the role of 5-HT1A receptors in memory; using selective ligands that differentially activate 5-HT1A receptors, it was determined whether a change in the activation state of these receptors can lead to deficient retrieval, and whether a so-produced deficit can occur in an animal model of depression. First, in vitro studies of [35S]GTPγS binding responses identified ligands that differentially activate 5-HT1A receptors in rat hippocampus. WAY 100635, 8-OH-DPAT and flesinoxan induced 5-HT1A receptor activation that amounted to −2, +50 and +63%, respectively, of that produced by 5-HT. Second, we determined whether changes in the activation state of 5-HT1A receptors could impair the retrieval of an operant response in vivo. Rats treated with either a 5-HT1A receptor ligand or saline were trained to lever press for milk reward, and were then tested for retrieval with either the same or another treatment. Animals trained with 8-OH-DPAT retrieved the response when tested in the same state, but not when tested in the saline state, and vice versa. Rats trained with 0.16 mg/kg of 8-OH-DPAT also retrieved the response when tested with the other intermediate-efficacy ligand flesinoxan (0.63 mg/kg), but not when tested in a state of lower-magnitude activation (i.e. with 0.16 mg/kg of WAY 100635). Animals trained with 0.16 mg/kg of WAY 100635 retrieved the response when tested in this same state or with saline, but not when tested in a state of intermediate-magnitude activation (i.e. with 0.16 mg/kg of 8-OH-DPAT). Finally, studies using the forced swimming paradigm indicated that the retrieval of learned immobility was similarly dependent upon the activation state of 5-HT1A receptors. The findings indicate that changes in activation states of 5-HT1A receptors can impair the retrieval of learned responses. It is suggested that depression may in part be acquired in the course of ontogeny and may be available for retrieval in the same but not in other states; various biological rhythms conceivably define such states." @default.
- W2064252404 created "2016-06-24" @default.
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- W2064252404 date "2000-12-01" @default.
- W2064252404 modified "2023-10-02" @default.
- W2064252404 title "Memory of an operant response and of depressed mood retained in activation states of 5-HT1A receptors: evidence from rodent models" @default.
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- W2064252404 doi "https://doi.org/10.1016/s0166-4328(00)00283-7" @default.
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