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A role for serotonin in lipopolysaccharide-induced anorexia in rats.

机译:血清素在脂多糖诱导的大鼠厌食症中的作用。

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Rats consistently reduce their food intake following injection of bacterial lipopolysaccharides (LPS). Because LPS increases CNS serotonin (5-HT) turnover, and because increases in CNS 5-HT turnover are associated with a decrease in food intake, we conducted a series of studies to examine 5-HT's potential role in LPS-induced anorexia. Chronic CNS 5-HT depletion by cisterna magna (CM) administration of 5,7-dihydroxytryptamine (5,7-DHT) failed to attenuate LPS-induced (100 microg/kg, ip) anorexia. In subsequent experiments, LPS was injected at lights out (hour 0) and [8-hydroxy-2-(di-n-propylamino)tetraline (8-OH-DPAT)] or N-CBZ-[(8beta)-1,6-dimethylergolin-8-yl]methylamine (metergoline) was injected at hour 5 - the time when LPS-treated rats become anorectic. Food intake was measured during the subsequent 2 h. In LPS-treated rats, 8-OH-DPAT (62.5, 125, or 250 microg/kg, sc) injection increased food intake. In a 2 x 2 factorial arrangement of LPS and 8-OH-DPAT, 125 microg/kg 8-OH-DPAT increased food intake significantly more in LPS-treated rats than in non-LPS-treated rats (significant LPS x 8-OH-DPAT interaction). In LPS-treated rats, 1 and 5 mg/kg metergoline significantly enhanced food intake. However, in a 2 x 2 arrangement of LPS and metergoline, 1 mg/kg metergoline failed to increase food intake in LPS and non-LPS-treated rats in two separate trials. The ability of the 5-HT(1A) receptor agonist 8-OH-DPAT to attenuate LPS-induced anorexia in rats supports a role of 5-HT in LPS-induced anorexia.
机译:注射细菌性脂多糖(LPS)后,大鼠会不断减少食物摄入量。由于LPS增加了CNS 5-羟色胺(5-HT)的转换,并且CNS 5-HT转换的增加与食物摄入的减少相关,因此我们进行了一系列研究,以研究5-HT在LPS诱发的厌食症中的潜在作用。大水罐(CM)给予5,7-二羟基色胺(5,7-DHT)的慢性中枢神经系统5-HT耗竭未能减弱LPS引起的厌食(100 microg / kg,ip)。在随后的实验中,将LPS熄灭(第0小时),然后注入[8-羟基-2-(二-正丙基氨基)四氢萘(8-OH-DPAT)]或N-CBZ-[(8beta)-1在第5小时(经LPS处理的大鼠厌食时)注射6-二甲基麦角灵-8-基]甲胺(美特古林)。在随后的2小时内测量食物摄入量。在LPS处理的大鼠中,注射8-OH-DPAT(62.5、125或250 microg / kg,sc)可以增加食物摄入量。在LPS和8-OH-DPAT的2 x 2析因排列中,LPS处理的大鼠的食物摄入量增加125 microg / kg 8-OH-DPAT明显高于未使用LPS的大鼠(显着LPS x 8-OH) -DPAT互动)。在接受LPS治疗的大鼠中,1和5 mg / kg美特古琳可显着提高食物摄入量。但是,在两个单独的试验中,以2 x 2的LPS和美特古琳布置,1 mg / kg美特古琳不能增加LPS和未用LPS治疗的大鼠的食物摄入。 5-HT(1A)受体激动剂8-OH-DPAT减弱大鼠LPS致厌食症的能力支持5-HT在LPS致厌食症中的作用。

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