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• W2004353058 abstract "The present study was designed to test the hypothesis that a major excitatory mechanism for the expression of feline defensive rage behavior involves the medial nucleus of the amygdala which utilizes substance P as a neurotransmitter in a direct output pathway that supplies the medial hypothalamus. In phase I of the experiment, stimulating electrodes were implanted into the medial amygdala and cannula electrodes were implanted into the medial and lateral hypothalamus from which defensive rage and predatory attack behavior could be elecited by electrical stimulation, respectively. Response latencies for defensive rage were significantly lowered after dual stimulation of the medial amygdala and medial hypothalamus relative to single stimulation of the medial hypothalamus alone. In phase II, dose- and time-dependent decreases in medial amygdaloid-induced facilitation of defensive rage were observed after the i.p. administration of the NK1 antagonist, CP-96,345 (0.05, 2 and 4 mg/kg). In phase III of the study, the effects of microinjections of CP-96,345 placed directly into defensive rage sites within the medial hypothalamus (0.05, 0.5 and 2.5 nmol) upon medial amygdaloid modulation of this response were assessed. Again, intracerebral administration of this antagonist blocked the facilitatory effects of medial amygdaloid-induced facilitation of defensive rage in a manner parallel to that observed with peripheral administration of the NK1 antagonist. The results suggest that the medial amygdala facilitates defensive rage by acting through a substance P mechanism at the level of the medial hypothalamus. Other experiments revealed that peripheral administration of the NK1 antagonist: (1) had little effect upon the latency or threshold for elicitation of defensive rage, suggesting that the medial amygdaloid-substance P facilitatory mechanism acts in a phasic rather than tonic manner; and (2) also blocks the suppressive effects of medial amygdaloid stimulation upon predatory attack behavior elicited from the lateral hypothalamus. The latter finding suggests that similar neurochemical mechanisms regulate medial amygdaloid modulation of both forms of hypothalamically elicited aggression. The final aspect of this study utilized the combination of retrograde-tracing of amygdaloid neurons into the medial hypothalamus after microinjections of Fluoro-Gold into defensive rage sites, and the immunocytochemical analysis of substance P neurons within the amygdala. The data indicated that large numbers of retrogradely and immunocytochemically positive labeled cells were identified in the medial nucleus, including many that were double-labeled. The overall findings of this study support the hypothesis that the medial amygdala provides a powerful excitatory monosynaptic input to the medial hypothalamus for the expression of defensive rage behavior and that this mechanism is mediated, at least in part, via a substance P mechanism." @default.
• W2004353058 created "2016-06-24" @default.
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• W2004353058 date "1993-10-01" @default.
• W2004353058 modified "2023-09-24" @default.
• W2004353058 title "Evidence that substance P is utilized in medial amygdaloid facilitation of defensive rage behavior in the cat" @default.
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• W2004353058 doi "https://doi.org/10.1016/0006-8993(93)91070-9" @default.
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