大鼠脊髓背角胶状质神经元的去极化反跳及调控机制
目的研究大鼠脊髓背角胶状质(SG)神经元的去极化反跳及调控机制,以期对去极化反跳相关疾病的临床治疗提供参考。方法选取3~5周龄SD大鼠,制作离体脊髓纵切片,应用全细胞膜片钳技术记录SG神经元的电生理学特点及接受超极化刺激后的反应,并观察超极化激活环核苷酸门控阳离子(HCN)通道阻断剂和T型钙(Cav3)通道阻断剂对去极化反跳的作用。结果共记录了63个SG神经元的电活动,其中23个无去极化反跳,19个为去极化反跳无放电,21个为去极化反跳伴放电。无去极化反跳组SG神经元的动作电位阈值(-28.7±1.6 m V)明显高于去极化反跳伴放电组(-36.0±2.0 m V)(P〈0.05)。HCN通道...
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Published in | 南方医科大学学报 Vol. 37; no. 2; pp. 204 - 209 |
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Format | Journal Article |
Language | Chinese |
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南昌大学第一附属医院疼痛科,江西南昌,330006%南昌大学第一附属医院儿科,江西南昌,330006%深圳市南山医院韩济生院士疼痛医学工作站,广东深圳,518052%南昌大学第一附属医院儿科,江西南昌330006
2017
南昌大学第一附属医院医学科研中心,江西南昌330006 深圳市南山医院韩济生院士疼痛医学工作站,广东深圳518052 |
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Summary: | 目的研究大鼠脊髓背角胶状质(SG)神经元的去极化反跳及调控机制,以期对去极化反跳相关疾病的临床治疗提供参考。方法选取3~5周龄SD大鼠,制作离体脊髓纵切片,应用全细胞膜片钳技术记录SG神经元的电生理学特点及接受超极化刺激后的反应,并观察超极化激活环核苷酸门控阳离子(HCN)通道阻断剂和T型钙(Cav3)通道阻断剂对去极化反跳的作用。结果共记录了63个SG神经元的电活动,其中23个无去极化反跳,19个为去极化反跳无放电,21个为去极化反跳伴放电。无去极化反跳组SG神经元的动作电位阈值(-28.7±1.6 m V)明显高于去极化反跳伴放电组(-36.0±2.0 m V)(P〈0.05)。HCN通道阻断剂氯化铯和ZD7288可显著延长去极化反跳伴放电的潜伏期,分别从45.9±11.6 ms增加到121.6±51.3 ms(P〈0.05)和从36.2±10.3 ms增加到73.6±13.6 ms(P〈0.05);ZD7288也能显著延长去极化反跳不伴放电的潜伏期,从71.9±35.1 ms增加到267.0±68.8 ms(P〈0.05),而T型钙通道阻断剂氯化镍和米贝地尔可显著降低去极化反跳伴放电的振幅,分别从19.9±6.3 m V降到9.5±4.5 m V(P〈0.05)和从26.1±9.4 m V降到15.5±5.0 m V(P〈0.05),米贝地尔同样能显著降低去极化反跳不伴放电的振幅,从14.3±3.0 m V降低至7.9±2.0 m V(P〈0.05)。结论近2/3的SG神经元有去极化反跳,其潜伏期和振幅分别受HCN通道和T型钙通道调控。 |
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Bibliography: | 44-1627/R LI Lingchao1, ZHANG Daying1, PENG Sicong2, WU Jing2, JIANG Changyu4, LIU Tao2,3,4 (1.Department of Pain Clinic, 2Department of Pediatrics, 3.Center for Experimental Medicine, First Affiliated Hospital of Nanchang University, Nanchang, 330006, China; 4Jisheng Han Academician Workstation for Pain Medicine, Nanshan Hosptal, Shenzhen 518052, China) Objective To investigate the rebound depolarization of substantia gelatinosa (SG) neurons in rat spinal dorsal horn and explore its modulatory mechanisms to provide better insights into rebound depolarization-related diseases. Methods Parasagittal slices of the spinal cord were prepared from 3- to 5-week-old Sprague-Dawley rats. The electrophysiologic characteristics and responses to hyperpolarization stimulation were recorded using whole-cell patch-clamp technique. The effects of hyperpolarization-activated cyclic nucleotide gated cation (HCN) channel blockers and T-type calcium channel blockers on rebound depolarization of the neurons were studied. Results A |
ISSN: | 1673-4254 |
DOI: | 10.3969/j.issn.1673-4254.2017.02.10 |