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作 者:李燕巍[1] 谢广茹[1] 李玲[1] 姜战胜[1] 岳振松[1] 潘战宇[1]
机构地区:[1]天津医科大学肿瘤医院国家肿瘤临床医学研究中心天津市肿瘤防治重点实验室,300060
出 处:《中华实验外科杂志》2016年第6期1625-1628,共4页Chinese Journal of Experimental Surgery
基 金:国家自然科学基金(81503622)
摘 要:目的观察苦参碱(Mat)对吗啡耐受的干预作用,检测其对吗啡激活的多药耐药蛋白P-糖蛋白(P-gp)过表达的作用。方法建立吗啡耐受大鼠模型,采用梯度浓度的Mat处理,疼痛行为学测试检测镇痛耐受程度;采用实时荧光定量聚合酶链反应(RT—PCR)及WesternNot技术检测多药耐药基因1(MDR1)mRNA和P—gp的表达;并进一步体外合成含环腺苷酸(cAMP)反应元件序列,用凝胶迁移或电泳迁移率实验(EMSA)技术检测MDR1基因上游启动子cAMP反应元件结合蛋白(CREB)的DNA结合活性的变化。结果7d后吗啡耐受模型建立,吗啡十Mat300mg/kg组甩尾阳性总数降低[(6.71±0.27)s],最大镇痛效应百分率(MPE%)为42.1%、血浆药物浓度一时间曲线下面积(AUC)比值为7.87及半数有效量(ED50)为(3.92±1.26)mg/kg效阈皆低于单纯吗啡组(P〈0.05)。单纯Mat组AUC为1.93,ED50为(4.15±0.54)mg/kg与阴性对照组比较也降低,差异有统计学意义(P〈0.05)。RT-PCR及P—gp结果表明,吗啡+Mat300mg/kg组MDR1mRNA及P—gp的表达与吗啡组比较下降(P〈0.05),但各个样本间的差异也有统计学意义,而Mat并不能影响CREB的DNA结合活性。结论Mat很可能在延缓吗啡耐受的同时具有一定的镇痛作用;其机制可能为抑制被吗啡激活的MDR1基因mRNA和P-gp的表达。Objective The matrine(Mat)on the development of morphine tolerance was investiga- ted in rats. Methods Established morphine tolerance rat model treated with Mat and morphine using the tail - flick test to assesse the degree of tolerance. The expression of morphine - induced muhidrug resist- ance (MDR) 1 and Permeability - glycoprotein (P - gp) was tested by reverse transcriptase - polymerase chain reaction (RT- PCR)/Western blotting analysis. Further synthesized in vitro with cyclic adenosine monophosphate (cAMP) response element sequence, using electrophoretic mobility shift assay (EMSA) detection of MDR1 gene upstream start cyclic adenosine monophosphate response element binding protein (CREB) DNA binding activity changes. Results Morphine tolerance model is established after 7 days, Mat (300 mg/kg) inhibited the development of morphine tolerance which decreased ( 6. 71 ± 0. 27 ) s, MPE% : 42. 1%, areas under the curve (AUC) ratio: 1.93 and EDs0 effective threshold: (4. 15 ± 0. 54) mg/kg were all below the morphine group (P 〈0. 05). MDR1 mRNA and P-gp expression was de- creasedin Mat (300 mg/kg) with morphine group (P 〈 0. 05), but the difference between the samples of each has statistical significance. Mat doesn' t affect CREB DNA binding activity. Conclusion These results suggest that Mat is likely not only can enhance morphine' s analgesic effects, but also has analgesic effects it- self, which the mechanism was related to the inhibition of MDR1 mRNA/P-gp expression.
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