白藜芦醇对大鼠脊髓急性损伤后继发性损伤的影响

目的:探讨脊髓损伤(SCI)后使用白藜芦醇(resveratrol, Res)对继发性脊髓水肿、受损脊髓组织中乳酸脱氢酶(LDH)与Na~+,K~+-ATP酶活性及早期脂质过氧化反应的影响。方法:采用重物下落撞击法制备成年大鼠的脊髓损伤模型,于损伤后即刻腹腔注射Res(50mg/kg,100mg/kg)或甲基强的松龙(MPSS,100mg/kg),观察给药后1h、24h、48h时Res组受损脊髓组织含水量、LDH与Na~+,K~+-ATP酶活性及MDA水平的变化,同时用电子显微镜观察超微结构的变化,并与MPSS组进行疗效对比。结果:Res显著抑制SCI后继发性水肿,48h最明显(P<0.05),抑制率为11.5％;显著降低LDH活性,24h时最大(P<0.01),抑制率大于40％;明显改善Na~+,K~+-ATP酶活性,以48h最显著(P<0.01),最大改善率在60％以上;显著抑制SCI后MDA产生,48小时为最明显(P<0.01),Res在50mg/kg和100mg/kg的剂量情况下所表现的上述作用比100mg/kg的MPSS更佳,电子显微镜的结果表明,Res和MPSS能有效保护SCI后脊髓组织的超微形态结构的正常性。结论:Res有效抑制脊髓损伤后的水肿和早期受损局部脂质过氧化反应并改善能量代谢系统,因此对脊髓损伤有潜在的治疗作用。

Effects of resveratrol on secondary damages after acute spinal cord injury in rats

AIM: To study the effects of resveratrol (Res) on secondary spinal cord edema, the activity of lactate dehydrogenase (LDH), Na~+, K~+-ATPase, and malondialdehyde (MDA) content in experimental spinal cord injured (SCI) rats. METHODS: The weight-dropping method was used to produce the experimental SCI in adult rats. Res (50, 100 mg/kg) and methylprednisolone (MPSS) 100 mg/kg were injected ip immediately after the induction of SCI. The effects of Res on edema, LDH, Na~+, K~+-ATPase, and MDA were determined at 1 h, 24 h, and 48 h after SCI compared with MPSS. The electron microscope was employed to investigate the ultrastructural effects of Res on axons, neurons, and subcellular organelles after SCI. RESULTS: Res obviously inhibited the secondary spinal cord edema with the most remarkable suppressing rate by 11.5% at 48 h. Res significantly suppressed the activities of the lactate dehydrogenase with the highest suppressing rate>40% at 24 h. Res markedly improved the Na~+, K~+ATPase activities that were promoted t the biggest extent of 60% at 48 h. At the same time, Res (50 and 100 mg/kg) obviously reduced MDA production in the injured spinal cord tissue in comparison with the SCI model, the most remarkable effect of Res was detected at 48 h with the inhibitory rate>40%. The ultrastructural findings suggested that SCI caused profound spinal cord damage, which could be protected or improved by injection of Res and MPSS. CONCLUSION: Both Res and MPSS effectively protected the spinal cord from secondary spinal cord injures. But the effects of Res 50 and 100 mg/kg were stronger in improving the energy metabolism system and inhibiting the lipid peroxidation in the local injured spinal cord after SCI than MPSS at the dose of 100 mg/kg. Res might have greatly potent therapeutic effects on SCI.