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慢性低氧及跑台训练对大鼠骨骼肌肌球蛋白重链(MHC)亚型基因表达的影响 总被引：2，自引：2，他引：0
为研究慢性低氧及跑台训练对大鼠骨骼肌肌球蛋白重链(MHC)亚型基因表达的影响,对揭示肌肉收缩蛋白性能的变化机制具有特定的意义.取健康SD雄性大鼠28只,随机分成4组进行试验,采用半定量反转录聚合酶链式反应(RT-PCR)法,测定骨骼肌MHC Ⅰ、Ⅱa、Ⅱx、Ⅱb四种亚型的mRNA基因表达.结果表明:与常氧对照组(C)相比,HC及NT组MHC各亚型mRNA表达量总体呈上升趋势(P＜0.05),仅仅低氧训练组(HT)MHC-Ⅱa亚型mRNA表达量明显下降(P＜0.05);另一方面,MHC各亚型mRNA所占百分比分析显示,慢性低氧能导致MHC亚型mRNA表达出现"由慢到快"变化趋势.另外,慢Ⅰ型百分比并未受慢性低氧及训练的影响. 相似文献
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一次力竭性离心运动后大鼠骨骼肌MHC各同功型基因表达及针刺对其影响 总被引：3，自引：0，他引：3
运动后MHC各同功型的基因表达可能与运动强度、持续时间、运动形式以及肌纤维在运动参与工作的情况有关.有可能在基因表达水平上,运动负荷越大,参与工作程度越大的肌纤维,运动后恢复期基因的超量表达就越明显.在针刺的作用下,运动后不同同功型MHC基因表达的变化趋势是:MHC-IIb 基因表达下降,MHC-IIx 基因表达增加,MHC-IIa 基因表达增加,MHC-I 基因表达下降. 相似文献
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高住低训对骨骼肌蛋白质及MHC含量作用及其机理研究 总被引：1，自引：0，他引：1
目的模拟高住低训,测试并分析AR蛋白表达、AR与DNA结合能力,骨骼肌总蛋白含量、MHC含量的变化,探讨低氧、运动对骨骼肌蛋白质合成的作用及其机理.方法雄性SD大鼠40只随机分为对照组、低氧组、运动组、低氧运动组,每组各10只.对照组在常氧环境下安静生活,低氧组每天在常压低氧帐篷中低氧暴露12 h,运动组白天在常氧环境中耐力运动1 h,低氧运动组运动和低氧暴露的方式和时间分别同运动组和低氧组.实验第28天取材,westem blot检测AR蛋白表达,EMSA测试AR与DNA的结合能力,BCA和SDS-PAGE分别测试骨骼肌总蛋白质含量和MHC含量.结果1)运动组比对照组AR蛋白表达升高,AR与DNA结合能力明显升高,有非常显著性差异(P<0.01),骨骼肌总蛋白质含量升高,有显著性差异(P<0.05),MHC含量明显升高,有非常显著性差异(P<0.01);2)低氧组比对照组AR蛋白表达降低,AR活性升高,骨骼肌蛋白质含量略升高,MHC含量稍降低;3)低氧运动组比运动组AR蛋白表达和AR活性下降,骨骼肌总蛋白含量和MHC含量下降,均有显著性差异(P<0.05).结论1)本实验耐力运动模型的选取是有利于蛋白质合成的,在此基础上进行低氧暴露模拟高住低训研究骨骼肌蛋白质合成的调控是可行的;2)运动后进行低氧暴露比单纯运动通过AR含量-AR活性水平抑制蛋白质合成,影响机体恢复;3)低氧、运动或低氧运动通过AR水平最终影响骨骼肌蛋白含量. 相似文献
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目的:比较测定几种不同动物骨骼肌肌球蛋白重链(MHC)亚型及成肌调节因子(MRFs)基因表达,引物均采用大鼠基因号设计,旨在比较观察其它动物与大鼠基因表达的交叉及相似度。方法:选用大鼠、家兔、牛与人的股外侧肌样本各6个,迅速用TRIZOL试剂匀浆固定,采用实时荧光-PCR法,测定骨骼肌MHCI,IIa,IIx,IIb四种亚型及成肌调节因子(MRFs)的mRNA基因表达。结果:未经内参较正的测定值,人、牛、兔的肌球蛋白重链(MHC)亚型及成肌调节因子(MRFs)基因表达均明显低于大鼠(P<0.01),提示各物种的同种基因存在差异性,其引物特异性较强;但经过内参校正后的测定值,人的MHC各亚型基因表达与大鼠含量较接近,有一定的交叉和基因相似性;而牛的含量虽可检出,但仍明显低于大鼠含量(P<0.01),表明其基因相似性较低;兔与大鼠基因未表现出相似性。提示,各物种同种基因的表达既存在差异性,又有一定的交叉和相似性。其蛋白水平的比较测定有待进一步研究。 相似文献
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Yang Li Hang Yan Wu-jun Xue Pu-xun Tian Xiao-ming Ding Xiao-ming Pan Xin-shun Feng Xiao-hui Tian He-li Xiang Jun Hou 《Journal of Zhejiang University. Science. B》2009,10(11):820-828
Objective: To explore the effects of cytomegalovirus (CMV) infection on rejection-related gene expression in the endothelial cells of renal transplantation recipients. Methods: Endothelial cells (ECs) were cultured and stimulated by a variety of factors: A, normal control group; B, inactivated human cytomegalovirus (HCMV) infection group; C, HCMV infection group; D, HCMV supematant infection group; and E, ganciclovir HCMV group. Expression of intercellular adhesion molecule-1 (ICAM-1) and major histocompability complex (MHC) class Ⅰ and class Ⅱ antigens was detected by flow cytometry (FCM) and immuno-histochemistry. Results: We found characteristic CMV-infected ECs in this study. There were no significant differences among groups A, B and D (P>0.05). Although the expression levels of ICAM-1 were not significantly different between groups C and E (P>0.05), the ICAM-1 expression in these two groups was significantly higher than that in group A (P<0.05). ICAM-1 expression was detected in groups C and E, while there was no expression in groups A, B and D. Furthermore, there was no significant difference of ICAM-1 mRNA expression between groups C and E (P>0.05). Human leucocyte antigen (HLA)-ABC expression was detected in all the groups, while HLA-DR expression was only detected in groups C and E. There were no significant dif-ferences of HLA-ABC and HLA-DR expression among groups A, B and D (P>0.05). However, the HLA-ABC and HLA-DR expression levels in groups C and D were higher than those of the remaining groups previously reported (P<0.05). Meanwhile, the HLA-ABC and HLA-DR expression levels in group E were lower than those of group C (P<0.05). Conclusion: CMV could up-regulate the expression levels of ICAM-1 and MHC antigens, which was closely related to allograft rejection. 相似文献
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目的:检测不同强度运动训练后成年SD大鼠比目鱼肌中不同肌纤维类型以及MHC亚型,旨在探讨不同强度运动训练引起比目鱼肌肌纤维和MHC亚型之间相互转化。方法:健康SD大鼠40只,随机分成安静组、小强度运动组、中等强度运动组和大强度运动组。取大鼠右侧后肢比目鱼肌,分别用ATP酶染色法鉴定I型和II型肌纤维;SDS-PAGE凝胶电泳技术分离MHCI、MHCIIa、MHCIIb和MHCIIx。结果:1)小强度运动使比目鱼肌I型肌纤维的面密度增加(P<0.01),II型肌纤维的面密度减少(P<0.05)。2)中等强度运动使I型肌纤维的面密度减少,II型肌纤维的面密度增加(P<0.05)。3)小强度运动使肌纤维MHCI%升高,MHCIIb%降低(P<0.01);中等强度运动使肌纤维MHCI%和MHCIIb%降低,MHCIIa%升高(P<0.01);大强度运动使肌纤维MHCIIx%升高(P<0.01)。结论:不同强度运动可以引起比目鱼肌MHC亚型之间发生变化,小强度运动引起MHCIIb向MHCIIx、MHCIIa、MHCI方向变化;中等强度、大强度运动引起MHCI、MHCIIb向MHCIIx、MHCIIa变化。 相似文献
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D Tomar V Chattree V Tripathi A A Khan A R Bakshi D N Rao 《Indian journal of clinical biochemistry : IJCB》2005,20(1):213-230
The development of vaccines to prevent infectious diseases has been one of the most important contributions of biomedical
sciences. Increasing understanding in biochemistry, molecular biology, molecular genetics and related fields have provided
an opportunity for the development of new generation vaccines that are based on rational design approaches. This is possible
because of proper understanding of the microbial-genetics, biochemistry, host-pathogen interaction and recent developments
in molecular immunology. Another important improvement made in the quality of vaccine production is the incorporation of immunomodulators
or adjuvants with modified delivery vehicles viz liposomes, Iscoms and microspheres apart from alum being used as a gold standard.
This article reviews the art of vaccination from Jenner period to present day context highlighting all the developments made
at each stage of the vaccine development. Various criteria have been discussed regarding the selection of epitopes that expand
B & T cells, its linkage with other accessory cells of the immune system, means to overcome MHC linked immune unresponsiveness,
enhanced antigen processing and presentations that specially induce either helper or cytotoxic or mucosal immune responses
were critically discussed. 相似文献
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Antony G. Philippe Fabio Borrani Guillaume Py Robin Candau 《Journal of sports sciences》2019,37(3):254-261
System theory is classically applied to describe and to predict the effects of training load on performance. The classic models are structured by impulse-type transfer functions, nevertheless, most biological adaptations display exponential growth kinetics. The aim of this study was to propose an extension of the model structure taking into account the exponential nature of skeletal muscle adaptations by using a genetic algorithm. Thus, the conventional impulse-type model was applied in 15 resistance trained rodents and compared with exponential growth-type models. Even if we obtained a significant correlation between actual and modelled performances for all the models, our data indicated that an exponential model is associated with more suitable parameters values, especially the time constants that correspond to the positive response to training. Moreover, positive adaptations predicted with an exponential component showed a strong correlation with the main structural adaptations examined in skeletal muscles, i.e. hypertrophy (R2 = 0.87, 0.96 and 0.99, for type 1, 2A and 2X cross-sectional area fibers, respectively) and changes in fiber-type composition (R2 = 0.81 and 0.79, for type 1 and 2A fibers, respectively). Thus, an exponential model succeeds to describe both performance variations with relevant time constants and physiological adaptations that take place during resistance training. 相似文献
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运动对骨骼肌肌球蛋白重链基因表达的影响 总被引：1，自引：0，他引：1
刘旭东 《山东体育学院学报》2006,22(6):56-58,62
骨骼肌是人体重要的运动器官。无论是在结构还是在功能上,骨骼肌都表现出多样性的特点,具有很好的可塑性,这使得骨骼肌对外界环境的变化具有极强的适应能力。肌球蛋白是肌肉中重要的结构和功能型蛋白,其结构中的重链(MyosinHeavy Chain MHC)有多种同功异构型,已有的研究显示,肌 相似文献
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肌球蛋白重链(Mysion Heavy Chain,MHC)是横纹肌收缩蛋白的重要组成成分。已发现MHC有多种亚型，在不同的机械负荷下可相互转化，呈现出对外界机械信号的高度适应性。机械生长因子(Mechano Growth Factor，MGF)可能在机械负荷和MHC亚型转变间发挥化学桥梁的功能。 相似文献
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