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作 者:宋璐[1] 马雅萍[1] 刘振国[1] 巴茂文[1]
机构地区:[1]上海交通大学医学院附属新华医院神经内科,200092
出 处:《中华神经科杂志》2008年第12期843-847,共5页Chinese Journal of Neurology
基 金:教育部留学回国人员科研启动基金资助项目(2006-331);上海市教育委员会基金资助项目(06BZ048);上海市浦江人才计划;上海市科委上海-飞利浦研究与发展基金合作基金资助项目(07SP07005)
摘 要:目的探讨腺苷A2A受体拮抗剂8-(3-Chlorostyryl)caffeine(CSC)对左旋多巴诱发的运动并发症的行为学与细胞学影响。方法通过6-羟基多巴(6-OHDA)立体定向注射至大鼠前脑内侧束建立帕金森病(PD)动物模型。模型成功大鼠接受每日2次左旋多巴甲酯(50mg/kg加12.5ms/kg苄丝肼)腹腔注射,持续22d。在第23天,运动并发症模型组大鼠(n=8)继续接受如上用药,用药组(n=8)在左旋多巴注射前注射腺苷A2A受体拮抗剂CSC,均用药至第29天。同时设假手术组(n=8)和PD对照组(n=8)。评估旋转时间,并采用免疫组织化学法和蛋白印迹法观察和检测纹状体区腺A2A受体的表达情况。结果左旋多巴长期用药诱发PD大鼠模型旋转反应时间缩短,同时模型组损伤侧纹状体区腺苷A2A受体的表达升高[阳性细胞指数(IOD),(11.55±2.75)×10^4],较假手术组[IOD,(6.02±1.29)×10^4]和PD组[IOD,(5.60±1.83)×10^4]有统计学意义(F=33.31,P〈0.05)。CSC用药逆转了左旋多巴诱导的PD大鼠旋转时间的缩短,损伤侧纹状体区腺苷A2A受体的表达[IOD,(5.80±1.56)×10^4]也下调至对照组和PD组水平。结论腺苷A2A受体参与了左旋多巴诱发的运动并发症的发生,腺苷A2A受体拮抗剂可能是治疗PD运动并发症有前景的药物。Objective To investigate cellular and behavioral effects of adenosine A2A receptor antagonist in a rat model of levodopa-induced motor complications. Methods The hemi-parkinsonian rat model was produced by stereotaxically injecting 6-OHDA to right medial forebrain bundle (MFB). Animals were intraperitoneally treated with levodopa 50 mg/kg plus benserazide 12. 5 mg/kg twice a day for 22 days and for one additional week with levodopa + 8-(3-Chlorostyryl) caffeine ( CSC, 5 mg· kg^-1· d^-1 ) or levodopa + vehicle. Rotational duration was estimated. After they were sacrificed, the expression of adenosine A2A receptor was observed by immunohistochemistry and Western blot. Results CSC, reversing the shortened rotational duration induced by levodopa, prolonged the rotational duration. This effect was maintained til the end of the treatment. The chronic levodopa treatment induced an upregulation of adenosine A2A receptor expression in the lesioned striatum (IOD, (11.55 ± 2. 75) × 10^4). The subsequent CSC treatment decreased the adenosine A2A receptor expression to the level of control ( IOD, ( 6. 02 ± 1.29) × 10^4) and PD group (IOD,(5.60 ± 1.83) ×10^4, F=33.31, P〈0.05). Conclusion These results suggest that adenosine A2A receptor is probably involved in the development of levodopa induced motor complications and adenosine A2A receptor antagonist could be useful in the treatment of motor complications in parkinsonian patients.
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