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• W2078530500 abstract "In a search for the mechanism by which neuropeptides influence the maintenance of avoidance behavior, a study was done of the effects of ACTH 4–10, arginine8-vasopressin (AVP), desglycinamide9-arginine8-vasopressin (DG-AVP), and of AVP antiserum on paradoxical sleep (PS) production and on theta activity generated during PS. Brattleboro rats which were homozygous (HO-DI) and heterozygous (HE-DI) for diabetes insipidus and homozygous normal (HO-NO) animals were used. The absence of AVP in HO-DI animals did not interfere with the production of PS during 8 hr recording sessions. However, it was found that the hippocampal theta activity of these animals exhibited significantly lower mean and peak frequencies than that of HE-DI or HO-NO rats. The deviation in the frequency content of the theta activity of HO-DI animals could be temporarily normalized by intraventricular injection of DG-AVP or ACTH 4–10. Inactivation of AVP in the brain of HO-NO rats by intraventricularly administered AVP antiserum induced hippocampal rhythmicity of the same frequency composition as that of HO-DI animals. Furthermore, intracerebroventricular administration of DG-AVP or ACTH 4–10 which both facilitate resistance to extinction of avoidance behavior [8,14], increased the proportion of high theta frequencies, whereas treatment with [D-phe7] ACTH 4–10, which facilitates extinction of active avoidance behavior [8], decreased the proportion of high frequency components in hippocampal activity of HE-DI animals. In addition, [D-phe7] ACTH 4–10 decreased the amount of high and increased the amount of low frequencies in the theta rhythm of HO-NO rats. None of the peptides tested appreciably affected the amount of PS. The experiments suggest that the increased resistance to extinction of avoidance behavior seen after the administration of neuropeptides related to vasopressin and ACTH could result from a longlasting increase in excitability induced by these substances in midbrain limbic circuits." @default.
• W2078530500 created "2016-06-24" @default.
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• W2078530500 date "1978-01-01" @default.
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• W2078530500 title "Neuropeptides: Effects on paradoxical sleep and theta rhythm in rats" @default.
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• W2078530500 doi "https://doi.org/10.1016/0091-3057(78)90123-5" @default.
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