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| Paper IPM / Cognitive%20Sciences / 13839 |
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The aim of the present study was to investigate the role of the amygdala in the potentiative effect of minocycline, a semisynthetic tetracycline antibiotic, on morphine analgesia in male Wistar rats. We also examined the involvement of the amygdala μ-opioid and N-methyl-D-aspartate (NMDA) receptors in the minocycline-induced potentiation of morphine analgesia. Intraperitoneal administration of morphine (3-9âmg/kg) induced analgesia in a tail-flick test. Bilateral intra-amygdala injection of minocycline (10-20âug/rat) enhanced the analgesic response of an ineffective dose of morphine (3âmg/kg). Injection of a higher dose of minocycline into the amygdala also induced analgesia. Moreover, bilateral intra-amygdala injection of naloxone (0.5-1.5âug/rat) reversed minocycline-induced potentiation of morphine analgesia. Pretreatment of animals with NMDA (0.01-0.1âug/rat, intra-amygdala) also inhibited the potentiative effect of minocycline on morphine response. Bilateral intra-amygdala injection of the same doses of naloxone or NMDA plus morphine had no effect on the tail-flick latency in the absence of minocycline. It can be concluded that the amygdala has a key role in the potentiative effect of minocycline on morphine analgesia. In addition, amygdala opioidergic and glutamatergic mechanisms may be involved, probably through μ-opioid and NMDA receptors, in the modulation of the minocycline-induced potentiation of morphine analgesia in the tail-flick test.
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