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The study of analgesic effect and mechanism of Yuanhu Zhitong Dropping Pills on dysmenorrhea model rats |
FENG Yue1,2 ZHANG Zongpeng1,2 SHEN Xiuping1,2 HU Jinfang1,2 |
1.Tianjin Institute of Pharmaceutical Research New Drug Evaluation Co., Ltd., Tianjin 300301, China;
2.Tianjin Engineering Research Center of Drug Preclinical Assessment Technology, Tianjin 300301, China |
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Abstract Objective To study the analgesic effect of Yuanhu Zhitong Dropping Pills on dysmenorrhea model rats and to discuss the possible mechanism. Methods Sixty female SPF grade Wistar rats were divided into control group, model group, small-dose (0.2 g crude drug/kg), low-dose (0.4 g crude drug/kg), medium-dose(0.8 g crude drug/kg), high-dose(1.6 g crude drug/kg) of Yuanhu Zhitong Dropping Pills group according to weight random block method, with 10 rats in each group. The model of dysmenorrhea was induced by intraperitoneal injection of oxytocin, and Yuanhu Zhitong Dropping Pills was administered by intragastric administration for 3 days after sensitized by intraperitoneal injection of estradiol benzoate. The effect of Yuanhu Zhitong Dropping Pills was observed by detecting latency stage and times of writhing response induced by dysmenorrhea, and the level of factors related to pain such as prostaglandin F2α and prostaglandin E2 in plasma were also detected. Results Compared with model group, the times of writhing response in low-dose , medium-dose, high-dose of Yuanhu Zhitong Dropping Pills group significantly decreased (P < 0.05 or P < 0.01), and the preclinical period of writhing response in low-dose, medium-dose, high-dose of Yuanhu Zhitong Dropping Pills group showed an extension trend, while the standard deviation was large due to individual differences, the differences were not statistically significant (P > 0.05). Compared with model group, the level of β-endorphin and prostaglandin E2 in medium-dose and high-dose of Yuanhu Zhitong Dropping Pills group increased significantly (P < 0.05 or P < 0.01), and the level of noradrenaline, 5-hydroxytryptamine, the ratio of prostaglandin F2α to prosta-glandin E2 decreased significantly (P < 0.05 or P < 0.01), the level of prostaglandin F2α in high-dose of Yuanhu Zhitong Dropping Pills group decreased significantly (P < 0.05). There was no statistically significant difference on the level of thromboxane B2 and 6-Keto-prostaglandin F1α between medium-dose, high-dose of Yuanhu Zhitong Dropping Pills group and model group (P > 0.05). Conclusion Yuanhu Zhitong Dropping Pills has significant analgesic effect on dysmenorrhea model rats with the dose of 0.8-1.6 g crude drug/kg. The multi-way analgesic effect is probably related to improved levels of pain-associated prostaglandins, monoamine transmitters, and β-endorphin in peripheral blood.
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