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• W2048008974 abstract "The findings of this study support the hypothesis that N-methyl-D-aspartate (NMDA) receptors mediate the initiation of long-term potentiation (LTP) and behavioral changes induced by the anxiogenic beta-carboline, FG-7142. Unlike previous work, this study examined the effects of FG-7142 on LTP of amygdala efferents in both hemispheres. 7-amino-phosphono-heptanoic acid (AP7), a competitive NMDA receptor blocker, given prior to administration of FG-7142, prevented LTP in amygdala efferent transmission to the medial hypothalamus and periacqueductal gray (PAG). When given FG-7142 alone, cats showed lasting behavioral changes accompanied by LTP in all pathways studied. Duration of LTP, and its relationship to behavioral change, depended on the pathway and the hemisphere of the pathway. Correlation and covariance analyses indicate that LTP in the left amygdalo-ventromedial hypothalamic pathway mediates initiation, but not maintenance, of increased defensiveness. This finding replicates previous work. A new finding is that increased local excitability in the right basal amygdala (reduced threshold for evoked response), and LTP in the right amygdalo-PAG pathway, may be important for maintenance of increases in defensive behavior. Furthermore, the effects of flumazenil, a benzodiazepine receptor antagonist, on behavior and physiology single out the importance of right amygdalo-PAG LTP as a critical mediator of increased defensiveness. Flumazenil reversed the increase in defensiveness produced by FG-7142 in a drug-dependent manner as described in Adamec (1998a). Moreover, flumazenil reversed LTP only in the right amygdalo-PAG pathway. The findings of the present study suggest that response to FG-7142 may be a useful model of the effects of traumatic stressors on limbic system function in anxiety, especially in view of the recent data in humans implicating right hemispheric function in persisting negative affective states." @default.
• W2048008974 created "2016-06-24" @default.
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• W2048008974 date "1998-05-01" @default.
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• W2048008974 title "Evidence that NMDA-dependent limbic neural plasticity in the right hemisphere mediates pharmacological stressor (FG-7142)-induced lasting increases in anxiety-like behavior" @default.
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• W2048008974 doi "https://doi.org/10.1177/026988119801200301" @default.
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