Methylprednisolone combined with puerarin in the prevention of spinal cord ischemia-reperfusion injury / 中华骨科杂志

ABSTRACT

Objective To investigate the effect of methylprednisolone (MP) combined with puerarin in preventing the spinal cord ischemia-reperfusion injury (SCII).Methods The model of ischemia-repeffusion injury was established by clipping the abdominal aorta of rats for 30 min.Eighty male SD rats were randomly and equally divided into 4 groups the blank group in which the abdominal aorta was only exposed,the positive drug group in which intravenous MP injection (30 mg/kg) was conducted 30 min before the establishment of the ischemia-reperfusion injury model,the therapy group in which intravenous MP (10 mg/kg)and puerarin (30 mg/kg) injection was conducted 30 min before the establishment of the model,and the model group in which the physiological saline equivalent to the volume of MP in the positive drug group were injected into the caudal vein of rats 30 min before the establishment of the model.Ten rats were taken from each group and the homogenation of the spinal cord was used to test expression level of superoxide dismutase (SOD) and sodium-potassium adenosinetriphosphatase (Na-K ATPase).For another 10 rats in each group,the BBB scoring system was used to evaluate the neural function of the hind limb immediately after recovery from anesthesia,12 h and 24 h after reperfusion,and the spinal cord was obtained 24 h after reperfusion to observe the morphous of the spinal cord neurons.Results The expression levels of SOD and Na-K ATPase in the model group,positive drug group and therapy group 3 h after reperfusion were significantly lower than that in the blank group; the expression levels of SOD and Na-K ATPase in positive drug group and therapy group were significantly higher than that in the model group,and there was no significant difference between the positive drug group and the therapy group with regard to the levels of SOD and Na-K ATPase.The BBB score was better in the positive drug group and the therapy group than those in the blank group and model group.Microscope observation showed that the degree of injury between positive drug group and therapy group was equivalent,while each of them was lower than that in the model group.Conclusion MP combined with puerarin plays a great role in the prevention of the SCII.