外源性磷酸肌酸对游泳力竭小鼠大脑中谷氨酸和钙-ATP酶活力的影响

摘要

Objective:To observe the effects of exogenous creatine phosphate on glutamic acid level and Ca2+-ATPase activity in brain of mice after exhaustive exercise and to further reveal the mechanism of exogenous creatine phosphate in allaying tiredness.Methods:All 36 mice,6-week-age,were divided into 4 groups:exhaustive swimming control group (group A); exhaustive swimming with medication group (group B); 8-min swimming control group (group C);and 8-min swimming with medication group (group D).The method of mice weight-loading swimming was used to sets up the model of exhaustive exercise,and each mouse loaded weight with 6％ of the mass of itself.Thirty min before the experiment,mice in groups B and D were given the intraperitoneal injection with creatine phosphate sodium by the standard of 1000 mg/kg,and the mice in groups A and C were given the same proportionate normal saline as placebo.The exhaustive swimming time was recorded,and glutamic level and Ca2+-ATPase activity were measured by using biochemical kits.Results:After testing,the exhaustion time in group B was longer than that in group A (P＜0.05).The Glu contents in groups B and D were significantly lower than in groups A and C (P＜0.05).Ca2+-ATPase activity in groups B and group D was significantly higher than that in groups A and C (P＜0.05).Conclusion:The mechanism of exogenous creatine phosphate in allaying tiredness may be closely related with increased Ca2+-ATPase activity and reduced glutamic level.%目的:研究外源性磷酸肌酸(PCr)对游泳力竭小鼠大脑中谷氨酸(Glu)和钙-ATP酶(Ca2+-ATPase)活力的影响,以进一步揭示PCr的抗疲劳机制.方法:将44只6周龄小鼠分为力竭对照组12只(A组)、力竭给药组12只(B组)、游泳8min对照组10只(C组)、游泳8min给药组10只(D组),采取小鼠负重游泳的力竭运动模型,每只小鼠负重量为自身体质量的6％.于游泳前30min,B、D组小鼠经腹腔注射磷酸肌酸钠溶液1000mg/kg;A、C组小鼠注射同等比例生理盐水作为安慰剂.记录力竭组小鼠的力竭游泳时间,采用化学比色法检测4组小鼠大脑中Glu含量和Ca2+-ATPase的活性.结果:经检测,B组小鼠的力竭游泳时间明显长于A组(P＜0.05).小鼠大脑Glu含量检测显示,B组明显低于A组,D组明显低于C组(P＜0.05)；Ca2+-ATPase活力检测显示,B组明显高于A组,D组明显高于C组(P＜0.05).结论:外源性PCr的抗疲劳机制与增强Ca2+-ATPase活性和间接降低大脑中的Glu含量有关.