褪黑激素对小鼠吗啡戒断反应及血清单胺类递质的抑制作用

目的观察褪黑激素对小鼠吗啡戒断反应及血清单胺类递质的影响。方法皮下注射定量吗啡,建立小鼠吗啡依赖模型;腹腔注射纳络酮催瘾。根据小鼠戒断反应中出现跳跃反应的潜伏期和跳跃次数评定戒断反应的强度。用高效液相色谱电化学检测法（ＨＰＬＣＥＣＤ）检测血中去甲肾上腺素和多巴胺含量。结果４种不同剂量（２５、５０、１００、２００ｍｇ／ｋｇ）的褪黑激素对小鼠吗啡戒断反应有明显抑制作用,并呈很好的量效关系。１００ｍｇ／ｋｇ的褪黑激素可抑制吗啡戒断反应引起的血清中去甲肾上腺素及多巴胺浓度的升高。结论褪黑激素可抑制小鼠吗啡戒断反应,并抑制戒断反应引起血清单胺类递质的升高。

The inhibitory effect of melatonin on morphine withdrawal syndromes and serum monoamines in morphine dependent mice

OBJECTIVE: To observe the inhibitory effect of melatonin on morphine withdrawal syndromes and serum monoamines in morphine dependent mice. METHODS: A physical dependent model in mice was established by subcutaneous injection of morphine. The intensity of withdrawal syndromes was evaluated according to the jumping latency and jumping times. The concentration of serum monoamines was detected with HPLC-ECD. RESULTS: The physical withdrawal syndromes in morphine dependent mice were inhibited partly by four different doses (25, 50, 100, 200 mg/kg) of melatonin and showed a significant dose-dependent manner. The increased concentration of serum norepinephrine and dopamine in morphine-dependent mice could be reduced by large dose (100 mg/kg) of melatonin. CONCLUSION: The jumping withdrawal syndromes and serum monoamiues in morphine-dependent mice could be inhibited partly by melatonin.