Changes of TGF-β2, MMP-2, and TIMP-2 levels in the vitreous of patients with high myopia

Purpose

To investigate the concentrations of transforming growth factor (TGF)-β2, matrix metalloproteinase (MMP)-2, and tissue inhibitor of metalloproteinase (TIMP)-2 in the vitreous of patients with high myopia.

Methods

Twenty-six patients with high myopia (HM) who received vitrectomy for macular retinoschisis or macular hole were enrolled in this prospective study. Twenty-six patients with idiopathic macular hole or macular epiretinal membrane were chosen as a control group. Vitreous samples were obtained during the vitrectomy surgery. The levels of TGF-β2、MMP-2、TIMP-2 in the vitreous samples were measured by enzyme-linked immunosorbent assay. The MMP activity was determined by a fluorometric assay.

Results

There was no significant difference in the vitreous level of TGF-β2 between HM (1.64?±?0.38 ng/ml) and the control group (1.56?±?0.32 ng/ml, p?=?0.56). The vitreous levels of MMP-2 in HM (32.40?±?14.90 ng/ml) were significantly higher than in the control group (21.42?±?6.74 ng/ml, p?MMP-2/TIMP-2 was significantly elevated in the vitreous samples from HM (0.61?±?0.19), compared to the control group (0.48?±?0.11, p?p?Conclusions The elevated MMP/TIMP ratio and MMP activity may play a role in the pathogenesis of human high myopia. Large prospective studies are needed to further investigate the effect of MMPs in the pathogenesis of human high myopia.     

内蒙古大学生学习倦怠分析

目的:了解内蒙古大学生学习倦怠的现状,为制定干预措施提供科学依据.方法:以<大学生学习倦怠问卷>为研究工具,对内蒙古自治区6所高校的438名大学生继续调查.结果:内蒙古大学生的学习倦怠程度较高;在行为不当上随着年级的增高程度减低;在情绪低落上,年级、专业和家庭所在地有交互作用.结论:内蒙古大学生的学习倦怠程度较高,由此我们可以看出地处西部欠发达地区的内蒙古自治区的教育水平有待加强.     

乾坤胶囊治疗肺癌的临床研究

目的:评价乾坤胶囊治疗肺癌的临床疗效并探讨该复方中药制剂抗肺癌的作用机理.方法:对100例经细胞病理学证实的肺癌患者,随机分为乾坤胶囊组(胶囊组)34例,化疗组33例,化疗 胶囊组(综合组)33例.从临床症状、免疫指标、血象、生活状态(Karnofsky评分标准)、体重及p53、PCNA的表达等方面进行了前瞻性对比治疗研究.结果:胶囊组、综合组、化疗组的总有效率分别为94.1%、90.9%、57.5%.经统计分析,胶囊组、综合组与化疗组比较均有显著性差异(P＜0.01及P＜0.05).显示乾坤胶囊对肺癌患者能明显改善症状、增加体重、有效地提高生存质量、显著地提高细胞免疫功能(NK细胞、LAK细胞、IL-2、CD3、CD4、CD4/CD8)、降低p53及PCNA阳性细胞数.结论:乾坤胶囊治疗肺癌疗效确切,无不良反应.其机理是全面提高患者的免疫功能,抑制p53及PCNA的表达.     

Microstructure and Friction Properties of CoCrFeMnNiTix High-Entropy Alloy Coating by Laser Cladding

To enhance the friction and wear properties of 40Cr steel’s surface, CoCrFeMnNi high-entropy alloy (HEA) coatings with various Ti contents were prepared using laser cladding. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) were used to characterize the phase composition, microstructure, and chemical composition of the samples. The findings demonstrated that the CoCrFeMnNiTi_x HEA coatings formed a single FCC phase. Fe₂Ti, Ni₃Ti, and Co₂Ti intermetallic compounds were discovered in the coatings when the molar ratio of Ti content was greater than 0.5. The EDS findings indicated that Cr and Co/Ni/Ti were primarily enriched in the dendrite and interdendrite, respectively. Ti addition can effectively enhance the coating’s mechanical properties. The hardness test findings showed that when the molar ratio of Ti was 0.75, the coating’s microhardness was 511 HV0.5, which was 1.9 times the hardness of the 40Cr (256 HV0.5) substrate and 1.46 times the hardness of the CrCrFeMnNi HEA coating (348 HV0.5). The friction and wear findings demonstrated that the addition of Ti can substantially reduce the coating’s friction coefficient and wear rate. The coating’s wear resistance was the best when the molar ratio of Ti was 0.75, the friction coefficient was 0.296, and the wear amount was 0.001 g. SEM and 3D morphology test results demonstrated that the coating’s wear mechanism changed from adhesive wear and abrasive wear to fatigue wear and abrasive wear with the increase in Ti content.     

Diagnostic significance of long non-coding RNAs expression in tuberculosis patients: A systematic review and meta-analysis

Objectives:It is crucial to identify effective diagnostic biosignatures of tuberculosis (TB) to optimize its treatment. Herein, we conducted a systematic review to elucidate the diagnostic efficacy of long noncoding RNA (lncRNAs) as TB biomarkers.Methods:We searched Medline, Web of Science, Embase, Cochrane Library, CNKI, Wanfang, VIP, and China Biology Medicine disc databases up to February 18, 2020. These studies focusing on lncRNAs as diagnosis markers of TB were collected. STATA 12.0 and Meta-disc1.4 software were used to analyze the data extracted from eligible studies.Results:We included 8 articles with 1058 TB patients, and 1896 healthy controls in our study. The values of pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, and diagnostic odds ratio were 0.63, 0.86, 4.48, 0.43, and 10.31, respectively. Additionally, we plotted the summary receiver operating characteristic curve to evaluate the diagnostic accuracy, and the area under the curve was 0.80.Conclusion:The present study is the first meta-analysis to assess the diagnostic accuracy of lncRNAs in TB patients. We found that lncRNAs might constitute potential biomarkers for the diagnosis of TB patients. More population-based high-quality research should be conducted to validate the efficacy lncRNAs in TB patients.     

RR间期散点图与时间RR间期散点图的临床应用

RR—Lorenz散点图与24h—tRR散点图具有诊断动态心电图的功能,对于典型的心脏节律,使用这两种散点图,容易明确诊断。在动态心电图分析中RR—Lorenz散点图与24h-tRR散点图提供了互补的信息。RR—Lorenz散点图无时间的概念,从散点图上不能得到散点发生的时间,而心脏节律异常的发生与时间相关,随时间的变化而不同,这给临床考察心律的变化与时间的相关性带来了困难。在24h—tRR散点图中散点过稀不能构成特征性图形,而散点过密有时会掩盖一些图形,这时从24h—tRR散点图推断心脏节律可能会遇到困难．这时参看RR—Lorenz散点图及1h—tRR散点图,基本能明确心律的性质。当节律的诊断还是存在困难,如存在散发的个别点或散点图特征不典型时,可采用散点逆向技术,即回归该点所对应的片段心电图,通过分析心电图,达到诊断心律的目的。     

曲美他嗪对非ST段抬高急性冠脉综合征患者心肌缺血和心率变异的影响

目的:观察曲美他嗪对非ST段抬高的急性冠脉综合症(NSTEACS)患者疗效及心率变异(HRV)的影响,评价其心肌保护作用。方法:选择NSTEACS患者74例,随机分为两组:一组使用阿司匹林、单硝酸异山梨酯、氟伐他汀、美托洛尔等常规治疗,另一组在常规治疗基础上加用曲美他嗪治疗。总观察疗程为8周,观察患者用药前后心率、血压、胸痛发作频率及持续时间、硝酸甘油每天含服次数、心肌缺血的范围及程度以及24 h动态心电图变化,进行疗效评定和HRV分析。结果:曲美他嗪组(有效率94.4%,显效率72.2%),疗效明显优于常规治疗组(有效率65.8%,显效率36.8%)(P<0.05或P<0.01)。SDNN、SDANN、rMSSD、PNN50均升高,低频谱功率(LF)、低频/高频谱功率比值(LF/HF)均降低,有统计学差异(P均<0.05)。高频谱功率(HF)升高,但无统计学差异(P<0.05)。结论:曲美他嗪能有效改善NSTEACS患者心肌缺血及HRV。     

鼓室硬化和非鼓室硬化中耳炎抗氧化能力的差异性研究

目的 了解鼓室硬化和非鼓室硬化中耳炎患者在抗氧化物质超氧化物歧化酶(superoxide dismutase,SOD)、过氧化氢酶(catalnse,CAT)活性及过氧化反应产物丙二醛(malondialdehyde,MDA)浓度方面的差异,以进一步探讨鼓室硬化形成的机制.方法 回顾分析56例(56耳)中耳炎、中耳炎后遗症手术患者资料,分成两组:鼓室硬化组26耳,非鼓室硬化组30耳.测定所有患者血浆、红细胞中SOD、CAT活力及血浆、中耳组织中MDA浓度.结果 分析用秩和检验及相关分析.结果 两组血浆中MDA含量差异无统计学意义.鼓室硬化组中耳组织中MDA含量较高,差异有统计学意义(P<0.05).两组红细胞中SOD和CAT活力差异无统计学意义.鼓室硬化组血浆中的SOD和CAT活力较非鼓室硬化组低.差异有统计学意义.鼓室硬化组术前的听力平均值与其各检测项目所测得的MDA、SOD、CAT值均不存在相关(P>0.05).结论 鼓室硬化患者可能存在局部氧自由基浓度增高和抗氧化物质活性降低的情况.局部氧自由基浓度增高,血液抗氧化物质无法进入中耳组织,可能是形成鼓室硬化的病理基础.     

骨髓干细胞移植治疗缺血性心脏病的研究进展

干细胞具有自我更新，多向分化能力，在适宜的体外培养中干细胞能够稳定生存增殖并保持多向分化潜能，是便于体外操作的理想的靶细胞。本综合近几年国内外献，阐述了骨髓干细胞通过移植技术移植至试验动物的病损心脏，可以分化增殖为心肌细胞和血管结构，从而改善缺血的心脏功能。因此具有广阔的临床应用前景，值得进一步研究。