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• W2011041181 endingPage "57" @default.
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• W2011041181 abstract "Aging involves neuronal and synaptic loss, and maintenance of function depends on adaptations in cellular responsiveness. We studied olfactory bulbectomy (OBX), a model that recapitulates monoaminergic dysfunction in depression, in 10-week vs 19-month-old rats, and evaluated 5HT (5-hydroxytryptamine, serotonin) mechanisms. OBX elicited little change in 5HT1A receptors in the cerebral cortex or striatum of either age group. In contrast, 5HT2 receptors showed disparate effects, with a decrease in the cerebral cortex of young OBX but not aging OBX rats, whereas the latter group showed a selective decrease in striatal 5HT2 receptors. Greater differences were apparent for 5HT-mediated cell signaling, assessed for the adenylyl cyclase (AC) cascade. In young animals, 5HT had a stimulatory effect on AC that was unaltered by OBX. However, in aging animals, the pattern of 5HT responses showed marked alterations in response to OBX: under basal conditions, stimulatory effects were enhanced but when AC was activated with forskolin, 5HT became markedly inhibitory in the striatum of aged OBX animals. Assessment of the relative AC responses to two direct stimulants that act on different epitopes of the enzyme, forskolin and Mn2+, pointed to a shift in the AC isoform and/or its ability to associate with G-proteins as the mechanism underlying the age-related differences for OBX effects. These data indicate that there are biological distinctions in the response of 5HT systems to OBX in young adult vs aging animals, which, if present in geriatric depression, could provide a mechanistic basis for differences in responses to antidepressants that act on 5HT." @default.
• W2011041181 created "2016-06-24" @default.
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• W2011041181 date "2004-09-15" @default.
• W2011041181 modified "2023-10-16" @default.
• W2011041181 title "Serotonergic Cell Signaling in an Animal Model of Aging and Depression: Olfactory Bulbectomy Elicits Different Adaptations in Brain Regions of Young Adult vs Aging Rats" @default.
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• W2011041181 doi "https://doi.org/10.1038/sj.npp.1300569" @default.
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