丙烯酰胺中毒大鼠血清和坐骨神经抗氧化能力时效变化

目的探讨丙烯酰胺（ACB）中毒大鼠血清、坐骨神经抗氧化指标的时间效应变化.方法选用雄性Wistar大鼠以40 mg/kg剂量ACB腹腔注射,对照组注射生理盐水,每周3次,连续10周,分别于0、2、4、6、10周取材,测血清、坐骨神经的氧化抗氧化指标.结果与对照组相比,随染毒时间延长,血清谷胱甘肽含量呈进行性降低,第6、10周分别降为对照组的92%和77%.坐骨神经中第2、4、6、10周分别降为92%、82%、67%和66%,差异有统计学意义（P＜0.05或P＜0.01）.丙二醛含量呈进行性增加,在血清中第4、6、10周分别增为对照组的113%、118%和120%;坐骨神经中第4、6、10周分别增为153%、167%和174%,差异有统计学意义（P＜0.05或P＜0.01）.抗活性氧单位水平降低,与对照组的差异有统计学意义（P＜0.05或P＜0.01）.谷胱甘肽过氧化物酶的活力进行性增加,在血清中第2、4、6、10周分别增为122%、130%、160和124%;坐骨神经中第4、6、10周分别增为134%、152%和164%,差异有统计学意义（P＜0.05）.谷胱甘肽还原酶的活力初期增加,后期则降低;坐骨神经中第6、10周分别降为59%和33%,差异有统计学意义（P＜0.01）;超氧化物歧化酶活力初期增加,后期降低,血清中第10周降为对照组的85%,差异有统计学意义（P＜0.05）.坐骨神经和血清中各指标随步态评分的改变与随时间的改变情况相近.血清和坐骨神经中丙二醛含量呈高度相关关系,差异有统计学意义（P＜0.01）;以染毒时间和步态评分为依据的相关系数分别为0.99,0.96.结论ACR中毒大鼠血清、坐骨神经中抗氧化指标改变存在时间-效应关系,两组织中存在相似的变化规律,而坐骨神经中变化较明显.

Time dependent changes in antioxidation of rat serums and sciatic nerves caused by toxicology

OBJECTIVE: To study the time dependent antioxidation changes of serum and sciatic nerve in rats intoxicated with acrylamide. METHODS: Male Wistar rats weighing 180 to 220 g were given acrylamide dissolved in physiological saline (40 mg/kg ip 3 days/week). The control groups received normal saline. The gait was observed and antioxidant indexes of rat serum and sciatic nerve were determined on 0, second, fourth, sixth, 10th week. RESULTS: With the extension of the intoxication period, compared with the control, the contents of glutathione in serum and sciatic nerve gradually decreased (P < 0.05; after 6 and 10 weeks to 92% and 77%; after 2, 4, 6 and 10 weeks to 92%, 82%, 67% and 66%); the levels of malondialdehyde gradually increased (P < 0.05; after 4, 6 and 10 weeks to 113%, 118% and 120%; after 4, 6 and 10 weeks to 153%, 167%, 174%); the abilities of the resistance to reactive oxygen species gradually decreased (P < 0.05; after 10 weeks to 82%; after 6 and 10 weeks to 76% and 71%); the activities of glutathione peroxidase gradually increased (P < 0.05; after 2, 4, 6 and 10 weeks to 122%, 130%, 160% and 124%; after 4, 6 and 10 weeks to 134%, 152% 164%); the activities of glutathione reductase increased at early stage (P < 0.01; after 4 and 6 weeks to 300% and 217%; after 4 weeks to 142%) and decreased later (P < 0.01; 6 and 10 weeks to 59% and 33% in sciatic nerve); the activities of superoxide dismutase increased primitively (P < 0.05; after 2 weeks to 110%; after 4 weeks to 124%) and decreased later (P < 0.05; after 10 weeks to 85% in serum). The changes of antioxidant indexes in serum and sciatic nerve according to gait score were similar. The level of MDA in serum was in high correlation (P < 0.01) with that in sciatic nerve. The regression coefficients were 0.99 and 0.96 according to the administration time and gait score respectively. CONCLUSION: The changes of the antioxidant indexes in serum and sciatic nerve of rat treated with acrylamide are time dependent. The changes in serum and sciatic nerve are similar but those in sciatic nerve are more remarkable.