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• W2023167145 abstract "In Brief Polyamines are thought to be involved in the regulation of numerous metabolic and electrophysiological processes in the nervous system. In this study we evaluated the effect of a synthetic polyamine-deficient diet on pain in a carrageenan (Car)-induced inflammatory rat model. Inflammation was induced with a unilateral subcutaneous injection of Car in a plantar hindpaw in rats fed without (control group) or with (deficiency group) a polyamine-deficient diet. Ipsilateral and contralateral hyperalgesia was evaluated using the Randall-Sellito pressure test. Heart rate changes were also recorded under general anesthesia. Then, the effects of a bupivacaine sciatic nerve block and subcutaneous injection of naloxone or ketamine were evaluated for Car-induced hyperalgesia. Data were analyzed using analysis of variance followed by unpaired Student's t-test (significance P < 0.05). Before Car injection, no significant difference was observed in response to mechanical stimuli between the control and the deficiency groups (n = 114 in pooled data). Car injection induced significant ipsilateral and contralateral hyperalgesia in the control groups, whereas a significant analgesic effect appeared in the deficient groups on both the ipsilateral and contralateral hindpaws. This analgesic effect was confirmed by the electrocardiogram recording that showed a significant increase in heart rate in the control group after Car injection compared with the deficiency group that showed a decrease in heart rate under general anesthesia. Bupivacaine sciatic nerve block had no significant effect on hypoalgesia phenomena induced by polyamine deficiency. Naloxone administration had no effect in the control group but reversed the analgesic effect in the deficiency group. Ketamine administration induced a significant analgesic effect in the control group and partly reversed the analgesic effect in the deficiency group. In conclusion, a synthetic polyamine-deficient diet had a significant general analgesic effect on Car-induced mechanical hyperalgesia. The mechanism of analgesic action remains to be elucidated. IMPLICATIONS: In a rat model, a synthetic polyamine-deficient diet alone can induce a significant analgesic effect on an inflammatory pain induced by carrageenan injection in a paw. The analgesic mechanism remains unclear, but it was totally reversed by a subcutaneous injection of naloxone and partly reversed by a subcutaneous injection of ketamine. A simple synthetic polyamine-deficient diet could reduce hypersensitivity to pain in the postoperative period." @default.
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• W2023167145 date "2006-06-01" @default.
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• W2023167145 title "An Evaluation of a Polyamine-Deficient Diet for the Treatment of Inflammatory Pain" @default.
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• W2023167145 doi "https://doi.org/10.1213/01.ane.0000205755.43562.2b" @default.
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