冰片对中枢及周围神经髓鞘的影响

目的 探讨冰片对大鼠中枢及周围神经髓鞘的影响.方法 SD大鼠根据灌服冰片石蜡油溶液的剂量不同分为低剂量(10 mL/kg)及高剂量(13mL/kg)2组,每组18只.另设对照组18只,灌服10 mL/kg石蜡油溶液.3组大鼠灌服冰片或石蜡油溶液后24 h、48 h及72 h取血并处死取脑、坐骨神经.进行血清髓鞘碱性蛋白(MAP)检测及透射电镜观察.结果 3个观测时间点中,高、低剂量组大鼠MBP含量明显升高,与对照组比较差异有统计学意义(P<0.05),但高、低剂量组之间差异无统计学意义(P>0.05).灌服冰片后24 h MBP含量最高,随时间延长递减,各时间点之间比较差异有统计学意义(P<0.05).电子显微镜观察大鼠灌服冰片后各时间点均可见中枢神经髓鞘异常,出现外形不规则,板层之间裂开,宽窄不均,纤维缠结现象,以24h改变最明显,随时间延长异常减轻;坐骨神经髓鞘仅在灌服冰片后24 h髓鞘数量出现明显减少,其余未见异常.结论 冰片可引起大鼠中枢及周围神经髓鞘出现一定程度的异常.

Abstract：

Objective To study the effect of borneol on myelin of the central and peripheral nervous systems. Methods The rats were divided randomly into low-dose borneol treatment group (10 mL/kg,n=18) and high-dose borneol treatment group (13 mL/kg, n=18). Controls (n=18) were chosen and treated with 10 mL/kg paroline. Rats were sacrificed 24, 48 and 72 h after the treatment, and the blood, brain and sciatic nerves of these rats were prepared, respectively; the level of serum myelin basic protein (MBP) was detected and the morphological structure of myelin was observed with transmission electron microscope. Results The content of serum MBP in the 2 treatment groups was advanced markedly as compared with that in the control group 24, 48 and 72 h after the treatment (P<0.05);however, no significant difference was noted between the 2 treatment groups (P>0.05). The content of serum MBP was the highest 24 h after the treatment, gradually decreased following the prolongation of time; significant difference was noted between each 2 time points (P<0.05). Transmission electron microscope indicated abnormality in myelin of the central nerves at all time points, showing inordinate shape, rupture between layers and tangle among fibers; the abnormality was the most obvious 24 h after the treatment, gradually abatement following the prolongation of time; decreased myelin in the sciatic nerves was showed only at 24 h after the treatment, while normal at other time points. Conclusion A certain degree of abnormality of myelin of the central and peripheral nervous systems in rats can be caused by borneol.

Effect of borneol on myelin of the central and peripheral nervous systems

Objective To study the effect of borneol on myelin of the central and peripheral nervous systems. Methods The rats were divided randomly into low-dose borneol treatment group (10 mL/kg,n=18) and high-dose borneol treatment group (13 mL/kg, n=18). Controls (n=18) were chosen and treated with 10 mL/kg paroline. Rats were sacrificed 24, 48 and 72 h after the treatment, and the blood, brain and sciatic nerves of these rats were prepared, respectively; the level of serum myelin basic protein (MBP) was detected and the morphological structure of myelin was observed with transmission electron microscope. Results The content of serum MBP in the 2 treatment groups was advanced markedly as compared with that in the control group 24, 48 and 72 h after the treatment (P<0.05);however, no significant difference was noted between the 2 treatment groups (P>0.05). The content of serum MBP was the highest 24 h after the treatment, gradually decreased following the prolongation of time; significant difference was noted between each 2 time points (P<0.05). Transmission electron microscope indicated abnormality in myelin of the central nerves at all time points, showing inordinate shape, rupture between layers and tangle among fibers; the abnormality was the most obvious 24 h after the treatment, gradually abatement following the prolongation of time; decreased myelin in the sciatic nerves was showed only at 24 h after the treatment, while normal at other time points. Conclusion A certain degree of abnormality of myelin of the central and peripheral nervous systems in rats can be caused by borneol.