异丙酚麻醉前后鼠脑ATPase活性的动态变化

目的　观察异丙酚 (propofol)麻醉不同时期大鼠大脑皮层、海马和脑干Na+ ,K+ ATPase、Ca2 + ATPase活性的动态变化 ,探讨异丙酚的全麻作用机制。方法　♀SD大鼠 40只 ,按麻醉不同时期随机分为 5组。分别在腹腔注射 (ip) 10ml·kg-1生理盐水 2min后 (对照组 ) ,ip异丙酚 10 0mg·kg-12min后、翻正反射消失前 (诱导期组 ) ,翻正反射消失后 3 0min(麻醉期组 ) ,翻正反射刚恢复、尚未完全清醒时 (恢复期组 ) ,动物完全清醒后 (清醒期组 ) ,断头取脑。用分光光度法测定各脑区Na+ ,K+ ATP酶和Ca2 + ATP酶的活性。结果　与对照组比较 ,异丙酚 10 0mg·kg-1使大脑皮层、海马和脑干的Na+ ,K+ ATP酶和Ca2 + ATP酶的活性在诱导期即降低 ,麻醉期进一步降低 (P <0 0 5 ,P <0 0 1) ,恢复期开始升高 ,但仍低于对照组 ,清醒期基本恢复到对照组水平。结论　异丙酚 10 0mg·kg-1能明显抑制脑ATP酶活性且与行为变化平行 ,提示ATP酶可能在异丙酚的全麻机制中发挥重要作用

The dynamic change of ATPase activities in rat brain with propofol anesthesia

AIM To investigate the effects of propofol on Na +, K + ATPase and Ca 2+ ATPase activities in rat brain. METHODS Forty rats were divided randomly into five groups. The animals were administered intraperitoneally (ip) propofol 100 mg·kg -1 or equal volume of normal saline (control group) respectively. These rats were immediately decapitated before (induction group) and after (anesthesia group) the disappearance of righting reflex, and when righting reflex appeared again (recovery group), and rats were completely conscious (awake group). Brain tissues were dissected on ice, then homogenized and centrifuged. Na +, K + ATPase and Ca 2+ ATPase activities were estimated by spectrophotometry. RESULTS Propofol 100 mg·kg -1 ip significantly inhibited Na +, K + ATPase and Ca 2+ ATPase activities of cortex, hippocampus and brain stem as compared with that of normal saline group ( P <0 01 or P< 0 05). CONCLUSION The inhibitory effects of propofol may be related to the inhibition of Na +, K + ATPase and Ca 2+ ATPase activities of rat brain.