Effects of High Frequency Repetitive Transcranial Magnetic Stimulation on KCC2 Expression in Rats with Spasticity Following Spinal Cord Injury  

作　　者：高伟 于利国 刘雅丽 陈沫 王熠钊 黄晓琳 

机构地区：[1]Department of Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology [2]Department of Rehabilitation Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology

出　　处：《Journal of Huazhong University of Science and Technology(Medical Sciences)》2017年第5期777-781,共5页华中科技大学学报（医学英德文版）

基　　金：supported by the National Natural Science Foundation of China(No.81101458)

摘　　要：The effect of high-frequency repetitive transcranial magnetic stimulation（r TMS） on potassium-chloride cotransporter-2（KCC2） protein expression following spinal cord injury（SCI） and the action mechanism were investigated. SCI models were established in SD rats. Five groups were set up randomly： normal control group, SCI 7-day（7 D） model group, SCI 14-day（14 D） model group, SCI-7 DrTMS group and SCI-14 DrTMS group（n=5 each）. The rats in SCI rTMS groups were treated with 10 Hz rTMS from 8 th day and 15 th day after SCI respectively, once every day, 5 days every week, a total of 4 weeks. After the model establishment, motor recovery and spasticity alleviation were evaluated with BBB scale once a week till the end of treatment. Finally, different parts of tissues were dissected out for detection of variations of KCC2 protein using Western blotting and polymerase chain reaction（PCR） technique. The results showed that the BBS scores after treatment were significantly higher in SCI-7 DrTMS group than in SCI-14 DrTMS group（P〈0.05）. As compared with normal control groups, The KCC2 protein in SCI model groups was down-regulated after SCI, and the decrease was much more significant in SCI-14 D model group than in SCI-7 D group（P〈0.05）. As compared with SCI model groups, KCC2 protein in rTMS groups was up-regulated after the treatment（P〈0.05）. The up-regulation of KCC2 protein content and expression was more obvious in SCI-7 DrTMS group than in SCI-14 DrTMS group（P〈0.05）. It was concluded that 10 Hz rTMS can alleviate spasticity in rats with SCI, which might be attributed to the up-regulation of KCC2 protein. It was also suggested that the high-frequency rTMS treatment after SCI at early stage might achieve more satisfactory curative effectiveness.The effect of high-frequency repetitive transcranial magnetic stimulation（r TMS） on potassium-chloride cotransporter-2（KCC2） protein expression following spinal cord injury（SCI） and the action mechanism were investigated. SCI models were established in SD rats. Five groups were set up randomly： normal control group, SCI 7-day（7 D） model group, SCI 14-day（14 D） model group, SCI-7 DrTMS group and SCI-14 DrTMS group（n=5 each）. The rats in SCI rTMS groups were treated with 10 Hz rTMS from 8 th day and 15 th day after SCI respectively, once every day, 5 days every week, a total of 4 weeks. After the model establishment, motor recovery and spasticity alleviation were evaluated with BBB scale once a week till the end of treatment. Finally, different parts of tissues were dissected out for detection of variations of KCC2 protein using Western blotting and polymerase chain reaction（PCR） technique. The results showed that the BBS scores after treatment were significantly higher in SCI-7 DrTMS group than in SCI-14 DrTMS group（P〈0.05）. As compared with normal control groups, The KCC2 protein in SCI model groups was down-regulated after SCI, and the decrease was much more significant in SCI-14 D model group than in SCI-7 D group（P〈0.05）. As compared with SCI model groups, KCC2 protein in rTMS groups was up-regulated after the treatment（P〈0.05）. The up-regulation of KCC2 protein content and expression was more obvious in SCI-7 DrTMS group than in SCI-14 DrTMS group（P〈0.05）. It was concluded that 10 Hz rTMS can alleviate spasticity in rats with SCI, which might be attributed to the up-regulation of KCC2 protein. It was also suggested that the high-frequency rTMS treatment after SCI at early stage might achieve more satisfactory curative effectiveness.

关 键 词：spinal cord injury SPASTICITY repetitive transcranial magnetic stimulation potassium-chloride cotransporter-2 

分 类 号：R651.2[医药卫生—外科学]