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• W2061494582 abstract "Electrophysiological studies have led to the proposal that the neurobiological mechanism(s) underlying drug therapy of anxiety and depression involve(s) regionally specific adaptations in 5-HT(1A) receptor sensitivity. Depending on the drug utilized, a decrease in sensitivity of inhibitory somatodendritic autoreceptors, an increase in sensitivity of postsynaptic receptors, or both alterations, occur after several weeks of treatment. This hypothesis was tested using N,N-dipropyl-5-carboxamidotryptamine-stimulated guanosine-5'-O-(3-thio)triphosphate ([(35)S]GTPgammaS) binding assessed by autoradiography. Rats were treated for 21 days with one of four different anxiolytic/antidepressant drugs (in mg/kg): fluoxetine (10), imipramine (10), clorgyline (1), ipsapirone (2 x 20) or saline. Three brain regions rich in 5-HT(1A) receptors were examined: the dorsal raphe (somatodendritic), the dorsal hippocampus (postsynaptic) and the lateral septum (postsynaptic). Only imipramine (+17%) and fluoxetine (+54%) significantly increased agonist-stimulated binding in the dorsal hippocampus; all drugs except imipramine significantly decreased binding in the dorsal raphe (-19 to -41%). These results generally support the concept of a net enhancement of hippocampal 5-HT neurotransmission via one or more 5-HT receptor subtypes. The most consistent effect, however, was a significant decrease in stimulated [(35)S]GTPgammaS binding in the lateral septum after all four treatments (-14 to -23%), suggesting that this may be a heretofore unrecognized common outcome of antidepressant treatment deserving further study." @default.
• W2061494582 created "2016-06-24" @default.
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• W2061494582 date "2002-06-01" @default.
• W2061494582 modified "2023-10-16" @default.
• W2061494582 title "Repeated treatment with antidepressants differentially alters 5-HT1A agonist-stimulated [35S]GTPγS binding in rat brain regions" @default.
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• W2061494582 doi "https://doi.org/10.1016/s0028-3908(02)00064-3" @default.
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