摘要
BACKGROUND:Alpha-tocopherol(α-tocopherol) can effectively relieve neuronal damage induced by oxygen-centered free radicals.However,the effective dose remains controversial. OBJECTIVE:To evaluate the protective effects of low-concentrationα-tocopherol on neuronal membranes. DESIGN,TIME AND SETTING:Contrast observation and in vitro study,performed at Laboratory of Neurosurgery,Tianjin Huanhu Hospital between April and September 2006. MATERIALS:Fetal cortical neurons were derived from two 14-day pregnant SD rats,andα-tocopherol was provided by Sigma,USA. METHODS:The neurons were randomly assigned to six groups:(1) normal:neurons were cultured under normal conditions;(2) oxidative damage:oxidative free radicals was damaged using the Fenton reaction;(3)α-tocopherol:neurons were cultured in different concentrations ofα-tocopherol 10,20,40,and 80 mg/L for 2 hours,respectively. MAIN OUTCOME MEASURES:Neuronal membrane damage was observed using a confocal laser microscope,and malonaldehyde production was detected using the thiobarbituric acid method. RESULTS:At normal,biological concentrations(10 mg/L),α-tocopherol induced no change in the damaged neurons(P>0.05).However,at a concentration of 80 mg/L,the number of damaged neurons was significantly reduced,compared with the damage group(P<0.05). Malonaldehyde levels following 80 mg/Lα-tocopherol treatment were less than the oxygen free radical damage group(P<0.05),but greater than the control group(P<0.01). CONCLUSION:A concentration of 80 mg/Lα-tocopherol can effectively protect the neuronal Gel membrane from oxidative damage.
BACKGROUND： Alpha-tocopherol （ α-tocopherol） can effectively relieve neuronal damage induced by oxygen-centered free radicals. However, the effective dose remains controversial.
OBJECTIVE： To evaluate the protective effects of low-concentration α-tocopherol on neuronal membranes. DESIGN, TIME AND SETTING： Contrast observation and in vitro study, performed at Laboratory of Neurosurgery, Tianjin Huanhu Hospital between April and September 2006.
MATERIALS： Fetal cortical neurons were derived from two 14-day pregnant SD rats, and α-tocopherol was provided by Sigma, USA. METHODS： The neurons were randomly assigned to six groups： （1） normal： neurons were cultured under normal conditions; （2） oxidative damage： oxidative free radicals was damaged using the Fenton reaction; （3） α-tocopherol： neurons were cultured in different concentrations of -tocopherol 10, 20, 40, and 80 mg/L for 2 hours, respectively.
MAIN OUTCOME MEASURES： Neuronal membrane damage was observed using a confocal laser microscope, and malonaldehyde production was detected using the thiobarbituric acid method. RESULTS： At normal, biological concentrations （10 mg/L）, α-tocopherol induced no change in the damaged neurons （P 〉 0.05）. However, at a concentration of 80 mg/L, the number of damaged neurons was significantly reduced, compared with the damage group （P 〈 0.05）. Malonaldehyde levels following 80 mg/L α-tocopherol treatment were less than the oxygen free radical damage group （P 〈 0.05）, but greater than the control group （P 〈 0.01）. CONCLUSION： A concentration of 80 mg/L α-tocopherol can effectively protect the neuronal cell membrane from oxidative damage
基金
Supported by:the 211 Key Subject Construction Foundation of Tianjin,No. 05YFGD5F02500
