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目的:研究小半夏汤(small pinelliae decoction,SPD)止呕作用及机制。方法:用顺铂(7.5 mg.kg-1)和阿扑吗啡(1.6 mg.kg-1)制备水貂呕吐模型。提取SPD(半夏生姜=1 1)有效成分制备成颗粒,给予水貂灌胃(ig)SPD(相当于给予4.0,1.0 g.kg-1生药量)30 min后,再腹腔注射(ip)顺铂或阿扑吗啡,研究SPD对外周和中枢性两种呕吐模型的抑制作用及机制。结果:SPD可显著抑制顺铂(72 h内)引起的急性和延迟性呕吐,减少干呕和呕吐次数并延长呕吐潜伏期(P<0.01);并可对抗顺铂引起极后区和回肠组织P物质I型受体(neurokinin-1,NK1)表达增加(P<0.05)。SPD也可抑制阿扑吗啡(6 h内)的呕吐反应(P<0.01);但对其呕吐潜伏期效果不显著,却可显著降低呕吐率(P<0.05)。结论:SPD颗粒对于顺铂和阿扑吗啡所导致的呕吐均有抑制作用,其作用机制与抑制中枢及外周的NK1受体表达有关。 相似文献
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1、资料与方法
一般资料选定择期在硬膜外麻醉下剖宫产术健康足月产妇100例、年龄20~34岁、同意运用PECA的孕妇为研究对象.…… 相似文献
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Chronic morphine drinking establishes morphine tolerance, but not addiction in Wistar rats 总被引:1,自引:0,他引:1
Binsack R Zheng ML Zhang ZS Yang L Zhu YP 《Journal of Zhejiang University. Science. B》2006,7(11):892-898
Objective: Some animal models apply morphine in the drinking water to generate addiction, but related reports are not free of conflicting results. Accordingly, this study aimed to figure out if chronic consumption of morphine in the drinking water can induce morphine addiction in Wistar rats. Methods: For 3 weeks, the animals received a daily morphine dose of 35 mg/kg by offering a calculated volume of sugar water (5% sucrose) with morphine (0. l mg/ml) to each rat; animals receiving just sugar water served as controls. Immediately after the treatment phase, the tail immersion test was used to check for morphine tolerance, and all animals were then kept on tap water for one week (withdrawal phase). Afterwards, all rats were allowed to choose their drinking source by offering two bottles, containing sugar water without and with morphine, simultaneously for two days (preference phase). Results: While the chronic consumption of morphine led to a reduction in body weight and to morphine tolerance, the morphine-treated Wistar rats did not show any preference for the opiate-containing sugar water. Conclusion: Body weight loss and tolerance do not reveal a condition of drug craving, and current animal models should be re-evaluated regarding their potential to establish morphine addicted animals. 相似文献
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张珠容 《第二课堂(小学)》2010,(10)
南美洲的亚马逊丛林,在很多人看来,很像是一个伊甸园。但实际上,大多数生长在这里的果实都是有毒的,它们往往含有吗啡、可卡因等毒素,甚至连树叶都是危险的,几乎都不能食用。为什么这些植物含有这么多的毒素呢?因为植物无法以逃跑或躲避的方式来保护自己,于是这些植物发展了自身的化学武器,也就是靠 相似文献