不同剂量褪黑素对松果体切除鸡脊柱侧凸发生率的影响  

Role of injection of different doses of melatonin for scoliotic deformity in the pinealectomized chickens

作　　者：朱晓东[1] 李明[1] 白玉树[1] 倪春鸿[1] 赵新刚[1] 王善松[1] 侯铁胜[1] 

机构地区：[1]第二军医大学附属长海医院骨科,上海200433

出　　处：《中华骨科杂志》2004年第7期436-438,共3页Chinese Journal of Orthopaedics

基　　金：国家自然科学基金资助项目(30271440);上海市科技启明星跟踪基金资助项目(2002QB1403)

摘　　要：目的探讨不同剂量褪黑素在切除松果体鸡脊柱侧凸产生中的作用,阐明脊柱侧凸的发生率与给药方式及给药剂量的关系。方法刚孵化的雌性国产绍兴鸡50只,随机分为5组,每组10只。孵化后第3d行松果体切除术。(1)10只作为对照,在控制白天12h光照(光照度为500lx)、夜间12h完全黑暗(光照度为0～5lx)条件下饲养;(2)其余40只分为4组,每组10只,即M-5、M-10、M-20及M-40组,每天分别腹腔注射5mg/kg、10mg/kg、20mg/kg与40mg/kg的褪黑素制剂,控制光照条件同对照组。3个月后对所有动物行X线检查,观察脊柱的变化。结果3个月时共有25只发生了的脊柱侧凸。对照组、M-5、M-10、M-20以及M-40组中脊柱侧凸的发病数分别为6只(66.7%)、5只(50.0%)、5只(62.5%)、4只(50.0%)和5只(50.0%)。平均Cobb角为26.7°、23.5°、21.7°、24.5°和23.2°。M-5、M-10、M-20、M-40与对照组在脊柱侧凸的发生率和平均Cobb角上无明显差异。结论给予不同剂量的褪黑素并不能降低切除松果体鸡脊柱侧凸的发生率和侧凸的严重程度。Objective To find out if different doses of melatonin have different roles in the cause or treatment of idiopathic scoliosis, and to illuminate whether melatonin can be a substitution in the treatment of pinealectomized chickens. Methods Fifty Little-Shaoxing chickens, in which pinealectomy was performed when 3-day-old, were divided into five groups. Ten served as control group, were kept in light-dark (12h: 12h) cycle, 500 lx in daytime and 0-5 lx in nighttime after surgery. Ten served as M-5 group, were given 5 mg/kg (5 milligrams per kilogram of body weight) melatonin twice every day. Ten as M-10 group, given 10 mg/kg melatonin abdominally twice every day, ten as M-20 group, given 20 mg/kg melatonin twice every day, and ten as M-40 group, given 40 mg/kg melatonin twice every day. The light-dark (12h: 12h) cycle was the same as control group. Radiological examinations were performed on all chicken spines for scoliosis when at 3 months old. Measured of the angle of the scoliosis was taken by Cobb's technique, and the data was analyzed by statistical software. Results Overall, there was 25 chickens developed to scoliosis in all when the chickens were 3 months. The attack rate was only 56%; this rate was consistent throughout all experimental groups. In the control group, 6 chickens had obvious scoliosis, and 5 in M-5 group, 5 in M-10 group, 4 in M-20 group, and 5 in M-40 Group. And the average Cobb's angle of control group was 26.7°. There were 23.5°, 21.7°, 24.5° and 23.2° in M-5, M-10, M-20 and M-40 respectively. There was no statistical significance in the average Cobb's angle and the incidence of scoliosis among all groups. It was determined that neither the prevalence nor the pattern of the scoliosis was affected by the therapy in any of the experimental groups. Conclusion Different dose of melatonin can't reduce the rate of scoliosis in the pinealectomized chickens, and also can't prevent the development of the experimental scoliosis. The results of this study raise doubts regarding the role of melaton

关 键 词：褪黑素 松果体切除 脊柱侧凸 发生率 

分 类 号：R96[医药卫生—药理学]