运动对骨骼肌线粒体通透性转换孔及细胞凋亡的影响     

王冬梅  董军  漆正堂  丁树哲 《西安体育学院学报》2011,28(4):471-475

目的观察耐力训练和一次性力竭运动对大鼠骨骼肌线粒体通透性转换孔(mitochondrial permeability transi-tion pore,MPTP)相关因素及细胞凋亡的影响。方法 24只大鼠随机分为3组:对照组(C组)、耐力训练组(T组)和一次性力竭组(E组)。T组进行无负重游泳训练,6次/周,共6周,训练时间从每天45 min逐渐增加到90 min;E组正常笼内饲养6周后进行一次力竭性游泳运动。通过紫外分光光度仪检测MPTP的开放;Western blot检测细胞色素c(Cyt c)的释放;RT-PCR检测Bcl-2和Bax mRNA;双光束紫外分光光度仪检测线粒体Ca2+的转运。结果与对照组相比:(1)T组线粒体吸光度值和Ca2+的转运量无显著性变化,Cyt c的释放量与Bax mRNA的表达显著减少,Bcl-2 mRNA的表达显著增加;(2)E组线粒体吸光度值显著减少,Cyt c释放量及Ca2+转运量显著增加,Bcl-2mRNA表达显著下降,Bax mRNA表达显著增强。结论 耐力运动可能通过上调Bcl-2/Bax基因表达,减少Cyt c释放,稳定MPTP开放,从而减少细胞凋亡;一次性力竭运动可能通过下调Bcl-2/Bax基因表达,MPTP异常开放,增加Cyt c和Ca2+释放,促进细胞凋亡。  相似文献   

少年男子中长跑运动员10km训练跑对血清心肌损伤标志物水平的影响     

时庆德  聂金雷  刘蔚 《北京体育大学学报》2011,34(3):52-55

目的:观察常规训练中非力竭耐力运动前后少年运动员血清心肌损伤标志物水平的变化。方法:测定19名少年男子中长跑运动员在常规训练中一次非全力10 km跑前、运动后2 h、运动后4 h以及运动后24 h血清心肌肌钙蛋白T亚基(cTnT)、I亚基(cTnI)、CK-MB活性及CK-MB质量水平。结果:10 km跑可显著提高被试者血清cTnT、cTnI及CK-MB质量水平。运动后4 h内血清cTnT和cTnI可超过临床心肌损伤(60%以上被试者)甚至心肌梗死(10.5%~42.1%被试者)界值,而运动后24 h,血清cTnT及cTnI恢复至正常水平。另外,运动前后各观察点都有相当比例的被试者(15.8%~84.2%)CK-MB活性及质量超过心肌损伤界值。结论:非力竭性耐力运动可能引起少年运动员可逆性心肌微损伤,但其确切机制、临床意义及远期后果有待进一步研究。  相似文献   

基于线粒体cytb片段探索小麂新亚种——江口亚种（Muntiacus reevesi jiangkouensis subsp．nov．）的分类地位     

袁小爱  田东  朱玉婷  肖羽 《六盘水师范高等专科学校学报》2011,23(4):85-88

从保存于贵州师范大学生科院动物标本室的小麂陈旧皮张中提取DNA。利用线粒体DNA细胞色素b通用引物通过PCR扩增,获得小麂江口亚种（Munuacus reevesi Jiangkouensis subsp．nov．）和小麂指名亚种（Muntiacus reevesireevesi）线粒体DNA细胞色素b基因的部分序列,对二者进行序列比对,计算序列差异,并且用最大简约（MP）和贝叶斯（BI）方法构建系统进化树,结果不能确定江口小麂是小麂的新亚种。  相似文献   

有氧运动协同抗氧化剂对老年小鼠肾脏线粒体质和量的影响     

陈彩珍  卢健 《成都体育学院学报》2005,31(1):89-92,113

目的:研究小鼠衰老时肾脏线粒体形态、结构、功能及mtDNA的变化规律,观察有氧运动训练和抗氧化剂延缓肾脏老化的效果.方法:用电镜对线粒体观察计数,Clark氧电极法测定线粒体呼吸链CytC氧化酶及NADH脱氢酶活性,分光光度法测定抗氧化酶活性,聚合酶链反应检测mtDNA3866bp片段缺失率.结果:与5月龄小鼠比较,20月龄的老年小鼠肾脏线粒体数量减少、体积增大,线粒体呼吸控制率、ADP/O比值减小,呼吸链NADH脱氢酶、CytC氧化酶活性下降,mtDNA3866bp片段缺失率增加,而抗氧化酶活性却增大.结论:长期进行有氧运动和/或补充抗氧化剂可在一定程度上维持机体氧化与抗氧化的平衡,延缓mtDNA片段缺失率随增龄积累,预防线粒体老化,改善线粒体功能.  相似文献   

不同运动负荷对心脏超微结构与NO、NOS的影响   总被引：7，自引：3，他引：4  

田石榴  舒彬  陈文鹤 《沈阳体育学院学报》2003,(3):38-40,49

采用大鼠 8周递增负荷游泳训练模型 ,观察不同运动负荷方式对大鼠心脏超微结构的影响 ,以及血浆和心肌中舒血管因子一氧化氮NO、一氧化氮合酶NOS的变化 ,探讨不同运动负荷对大鼠的影响 ,并对其产生机制进行初步探讨。研究结果表明有氧训练能够使心肌的超微结构改善 ,提高心肌的cNOS活性、血浆NO水平 ,促进内皮组织舒张反应 ;大强度长时间的训练使心肌微细损伤出现 ,内皮组织损伤 ,但血浆NO水平变化不大。  相似文献   

参芪补剂对力竭性游泳小白鼠心肌线粒体抗氧化损害的功效     

孙远航 《体育成人教育学刊》2003,19(3):41-42

通过观察参芪补剂对小白鼠力竭性游泳耐力和游泳之后心肌线粒体抗氧化能力的影响，以及自行车运动员服用参芪补剂6周后运动成绩的变化情况。结果表明，参芪补剂有增强机体抗氧化损害的功效和延缓疲劳的作用。  相似文献   

Combinatorial Determination of Ischemia Modified Albumin and Protein Carbonyl in the Diagnosis of NonST-Elevation Myocardial Infarction     

Kritsanee Maneewong  Titiporn Mekrungruangwong  Saowanee Luangaram  Tomon Thongsri  Sarawut Kumphune 《Indian journal of clinical biochemistry : IJCB》2011,26(4):389-395

Ischemia modified albumin (IMA) and Protein Carbonyl (PC) have known as proteins that are modified on the similar basis of oxidative stress induced protein modification and may have diagnostic potential in acute myocardial infarction. This study aims to evaluate the ability of using IMA and PC content to diagnose Non-ST elevation myocardial infarction (NSTEMI) and efficiency of combining these two markers. Serum from NSTEMI and healthy control were determined for serum IMA and PC content. The results showed that both of serum IMA level and PC content in NSTEMI was significantly higher than that of healthy controls. However, the PC content showed greater diagnostic performance than IMA. Combinatorial determination of serum IMA level with PC content level was enhanced test efficiency. In conclusion, our finding demonstrated that IMA and PC content can be used as a diagnostic marker for NSTEMI.  相似文献   

Effects of short-term exercise training on tissue Doppler indices of left ventricular diastolic function in overweight and obese individuals     

Aletta Millen  Gavin Norton  Ingrid Avidon 《Journal of sports sciences》2013,31(5):487-499

Abstract

Although exercise training is unable to improve obesity-associated decreases in left ventricular (LV) diastolic function, as assessed using chamber function measurements, the effects on LV diastolic myocardial function, as assessed using tissue Doppler imaging (TDI), are uncertain. In 32 overweight (n = 11) or obese (n = 21), sedentary or recreationally active men and women (30–57 years), we assessed the effects of 6 weeks of exercise training either preceded (n = 16) or followed (n = 16) by a 6-week control period on TDI indices of LV diastolic function (e', e'/a' and E/e') (echocardiography). Diastolic function at baseline was comparable to that noted in overweight and obese participants from a community sample (n = 245), and 56% (n = 18) had e' values below the lower 95% CI of a lean and healthy cohort (n = 60) of the community sample. Exercise training increased peak oxygen consumption (27.4 ± 4.9 to 29.4 ± 5.8 mL · kg^–1 · min^–1, P = 0.0001), but had no effect on body mass index (P = 0.99). No changes in TDI indices of diastolic function were observed after exercise training in all the participants (e': P = 0.74, a': P = 0.98, e'/a': P = 0.85, E/e': P = 0.26), participants with abnormal e' values (n = 18)(e': P = 0.99, a': P = 0.96, e'/a': P = 0.91, E/e': P = 0.97) or obese participants (n = 21)(e': P = 0.67, a': P = 1.00, e'/a': P = 0.78, E/e': P = 0.11). In conclusion, exercise training, despite increasing cardiorespiratory fitness, is unable to improve obesity-associated decreases in LV diastolic myocardial function.  相似文献   

耐力训练预防急性酒精性肝损伤机制:线粒体生物合成   总被引：1，自引：0，他引：1  

马国栋  董杰  刘艳环 《上海体育学院学报》2012,(1):73-77

目的:研究耐力训练对肝脏线粒体生物合成能力的影响及与急性酒精性肝损伤的关系。方法:以SD大鼠建立急性酒精性肝损伤模型,以12周无负重游泳为运动手段,测定其肝脏及血液相关指标的变化。结果:未训练大鼠急性酒精摄入导致肝脏与血液ALT、AST、MDA、线粒体ROS生成及态4呼吸升高,GSH含量、态3呼吸和RCR降低,线粒体生物合成蛋白PGC-1α、NRF1、TFAM和COXIVmRNA表达升高;耐力训练后再给予急性酒精摄入,使大鼠肝脏与血液ALT、AST、MDA、线粒体ROS生成及态4呼吸显著低于直接急性酒精摄入大鼠,GSH含量、态3呼吸和RCR显著高于直接酒精摄入大鼠,线粒体生物合成蛋白PGC-1α、NRF1、TFAM和COXIVmRNA表达显著高于未训练急性酒精摄入大鼠。结论:耐力训练能提高肝脏线粒体生物合成能力,进而保护线粒体的功能,从而达到部分预防急性酒精性肝损伤的目的。  相似文献   

Non-commutability of results of highly sensitive troponin I and T immunoassays     

Lippi G  Cervellin G  Aloe R  Montagnana M  Salvagno GL  Guidi GC 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2012,22(1):127-129

Introduction:

The measurement of cardiospecific troponins is pivotal in the diagnostic and prognostic approach of patients with suspected acute myocardial infarction (AMI). However, no information is available on the commutability of results between the novel highly-sensitive (HS) troponin T (TnT) and I (TnI) immunoassays.

Materials and methods:

The study population consisted in 47 consecutive patients presenting at the emergency department (ED) of the Academic Hospital of Parma with suspected AMI. TnI was measured with the novel prototype Beckman Coulter HS-AccuTnI immunoassay on Access 2, whereas TnT was measured with the Roche HS-TnT immunoassay on Cobas.

Results:

Eight out of the 47 patients (17%) were finally diagnosed as having an AMI. The overall correlation between TnT and TnI for total patient group was acceptable (r = 0.944; P < 0.01). Nevertheless, when the analysis of data was carried out in separate groups according to the final diagnosis of AMI, two different equation results were obtained, i.e., HS-TnT = HS-AccuTnI × 0.349 + 20 (r = 0.823; P < 0.01) in non-AMI patients, and HS-TnT = HS-AccuTnI × 0.134 + 67 (r = 0.972; P < 0.01) in those with AMI.

Conclusions:

This study suggests the existence of two biological relationships between TnI and TnT in plasma, depending on the source of release from the myocardium. Moreover, the non-commutability of data between HS-TnT and HS-AccuTnI jeopardizes the clinical decision making, makes it impossible to calculate the delta or reference change value using the two biomarkers and to finally establish a reliable kinetics of troponin release from the injured myocardium.  相似文献