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• W2049045943 abstract "The basolateral amygdala (BLA) contains a high density of cannabinoid CB1 receptors and is critically involved in pain and fear-related behaviour. We investigated the effects of bilateral intra-BLA administration of the CB1 receptor antagonist/inverse agonist, rimonabant, on formalin-evoked nociceptive behaviour, fear-conditioned behaviour including analgesia, and associated brain regional alterations in Fos expression in rats. Intra-BLA administration of rimonabant significantly reduced formalin-evoked nociceptive behaviour in the absence, but not presence, of conditioned fear. Rimonabant attenuated a formalin-evoked reduction in freezing while emitting 22 kHz ultrasonic vocalisation in the early part of the fear expression trial. Formalin-evoked nociceptive behaviour was associated with increased Fos immunoreactivity (FI) in the CA2/3 region of the hippocampus and rostral ventromedial medulla, effects attenuated by intra-BLA rimonabant. Formalin also decreased FI in the cingulate cortex, an effect which was not observed in fear-conditioned rats. Contextually-induced fear was associated with increased FI in the dorsal caudal periaqueductal grey in the absence, but not presence, of formalin-evoked nociceptive tone. In conclusion, bilateral intra-BLA administration of rimonabant reduces nociceptive behaviour in a model of tonic, persistent inflammatory pain, an effect associated with reduced activation of neurons in the CA2/3 hippocampus and rostral ventromedial medulla. The data also provide evidence for differential pain- and fear-related brain regional activity in the presence or absence of contextually-induced aversion and nociceptive tone." @default.
• W2049045943 created "2016-06-24" @default.
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• W2049045943 date "2010-05-01" @default.
• W2049045943 modified "2023-10-01" @default.
• W2049045943 title "Effects of intra-basolateral amygdala administration of rimonabant on nociceptive behaviour and neuronal activity in the presence or absence of contextual fear" @default.
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• W2049045943 doi "https://doi.org/10.1016/j.ejpain.2009.08.009" @default.
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