小胶质细胞极化介导炎症反应在脊髓损伤中的作用

背景:小胶质细胞极化参与脊髓损伤后的炎症反应,并在其中发挥关键作用。相关研究表明,有效诱导小胶质细胞从M1促炎表型向M2抗炎表型极化,可以减轻脊髓损伤后的炎症反应,促进组织的修复再生和神经功能的恢复。目的:文章对小胶质细胞的功能和极化、小胶质细胞极化对脊髓损伤的影响及其潜在调控策略以及脊髓损伤后炎症反应进行综述。方法:检索PubMed、Web of Science和中国知网数据库,英文检索词为“microglia,polarization,spinal cord injury,inflammation”,中文检索词为“小胶质细胞、极化、脊髓损伤、炎症”,按纳入和排除标准共纳入80篇文献进行总结。结果与结论:①由小胶质细胞介导的稳定而持续的炎症反应,对脊髓损伤的预后至关重要。②在生理条件下,小胶质细胞处于M0静止表型,但在脊髓损伤后,小胶质细胞活化,进而极化成M1促炎表型,导致神经组织修复能力降低和出现持续性神经炎症。③在脊髓损伤的炎症反应过程中,调控小胶质细胞向M2表型极化或至少向M2表型倾斜,有利于抑制氧化应激反应、调节突触重塑、促进轴突再生和血管生成,是一种有效的调控策略。④截止到目前的研究表明,间充质干细胞、外泌体、临床药物、天然产物、miRNAs和靶点分子可调控小胶质细胞在M1和M2表型之间的转换,这为脊髓损伤后神经组织的修复提供了一种新的思路,未来需进一步研究小胶质细胞在脊髓损伤过程中调控极化的详细机制。     

关节镜治疗难治性髌前滑囊炎30例临床分析

目的探讨改进关节镜下治疗难治性髌前滑囊炎的疗效。方法自2009年6月~2014年5月对我院30例复发髌前滑囊炎患者,男22例,女8例。囊肿最大为8cm×12cm,最小为4cm×5cm,全部病例均在关节镜下手术治疗,平均手术时间为30分钟,术后固定2周。膝关节疼痛评价按采用视觉模拟评分法(visual analogue scale,VAS)评分、膝关节关节活动度(ROM)对术前、术后3、6、12、24、36个月随访时功能进行评价。结果术后随访,全部患者均无感染,无肿胀,关节活动正常,全部病例术后膝关节疼痛显著缓解,活动显著改善。仅有1例患者残留有膝前疼痛,1例患者局部皮肤有麻木感。结论关节镜下保守治疗髌前滑囊炎,美容效果和功能效果满意,适合临床开展。     

广州市至灵学校167名学员智残原因的调查分析

本文以广州市至灵学校（智低）167名学员为研究对象，完成智力测验、体格检查和染色体分析．并且追溯围产期和出生后的种种异常．询查智力低下的家族史。综合分析有关资料，显示围产期的某些不利因素、遗传与先天疾病，以及婴幼儿中枢神经系统疾病是主要的发病原因。从而指出，加强优生咨询、重视围产期保健、提高产前诊断和产程中的监护水平、早期防治胎婴儿中枢神经系统损伤和疾病等，是降低智残儿发生率的重要措施。     

人FascDNA的克隆及其在大肠杆菌中表达的研究

为获得高质量及充足的Ｆａｓ蛋白，采用ＰＣＲ技术调整Ｆａｓ基因的开放阅读框架，使之与生物素化蛋白基因阅读框架一致；缺失了ＦａｓｃＤＮＡ基因的起始密码子并增加一个大肠杆菌偏性终止密码子，构建ＦａｓｃＤＮＡ和生物素化融合原核表达质粒ＰｉｎＰｏｉｎｔ－Ｆａｓ。将重组质粒转入大肠杆菌ＨＢ１０１，经５００ｍｍｏｌＩＰＴＧ在３７℃条件下诱导４ｈ，ＳＤＳ－ＰＡＧＥ及Ｗｅｓｔｅｒｎ印迹检测融合蛋白在大肠杆菌得以高效表达，表达量为细菌总蛋白的１３．８％。用亲和层析树脂对生物素化融合蛋白进行亲和层析纯化，得到Ｆａｓ重组的蛋白，且表达的Ｆａｓ融合蛋白具有抗体结合活性。此蛋白的表达成功将解决Ｆａｓ膜蛋白不易提取的难题，为深入研究Ｆａｓ提供了良好材料来源     

免疫调节剂对烫伤大鼠脾细胞抗SRBC抗体及IFN—γ产生的作用

为探讨烧伤对大鼠免疫功能的影响及不同免疫调节剂对它的作用，本研究利用烫伤大鼠实验模型，采用溶血分光光度法和微量细胞病变抑制法，在整体条件下分别测定了各组烫伤大鼠伤后第５、１０天时脾细胞产生ＴＦＮ－γ和抗ＳＲＴＢＣ抗体的能力。     

超声波介导的基因输送技术

近年来超声波介导的基因输送技术由于其相对安全性和操作上的简单得到关注。本文对超声波导致的声致穿孔的机制,空化核的作用——增强基因输送的效率,以及细胞和在体基因输送效率作了综述,讨论了超声波介导的基因输送效率的影响因素。此方法充满希望并且载药的空泡可以作为一种新型药物载体在超声作用下实现药物的靶向输送     

Transforming growth factor-beta1 increases CXCR4 expression, stromal-derived factor-1alpha-stimulated signalling and human immunodeficiency virus-1 entry in human monocyte-derived macrophages

Stromal-derived factor-1 (SDF-1/CXCL12) and its receptor CXCR4 play crucial roles in leukocyte migration and activation, as well as embryogenesis, angiogenesis, cancer and viral pathogenesis. CXCR4 is one of the major human immunodeficiency virus-1 (HIV-1) coreceptors on macrophages. In many tissues macrophages are one of the predominant cell types infected by HIV-1 and act as a reservoir for persistent infection and viral dissemination. In patients infected by HIV-1, blood and tissue levels of transforming growth factor-beta1 (TGF-beta1) are increased. The purpose of this study was to evaluate the effects of TGF-beta1 on CXCR4 expression and function in primary human monocyte-derived macrophages (MDMs) and rat microglia. TGF-beta1 up-regulated CXCR4 and enhanced SDF-1alpha-stimulated ERK1,2 phosphorylation in these cells. The increased CXCR4 expression in human MDMs resulted in increased susceptibility of the cells to entry by dual-tropic CXCR4-using HIV-1 (D-X4). In contrast, TGF-beta1 failed to increase CCR5 expression or infection by a CCR5-using virus in MDMs. Our data demonstrate that TGF-beta1 enhances macrophage responsiveness to SDF-1alpha stimulation and susceptibility to HIV-1 by selectively increasing expression of CXCR4. The results suggest that increased expression of CXCR4 on macrophages may contribute to the emergence of dual-tropic X4 viral variants at later stages of HIV-1 infection.     

不同患者手术前后血中IL-2/sIL-2R系统的动态变化

本文研究28例胆囊炎胆石症、结肠癌和直肠癌患者手术前后血中IL-2/sIL-2R系统的动态变化。分别于手术前或当晨,术后1、2～3、5～7d抽血,测定血中IL-2、sIL-2R量,同时作CRP试验。结果表明,施行中等手术胆囊摘除总胆管切开引流术和半结肠切除术对IL-2/sIL-2R系统的影响与患者术前的水平有关。原先异常程度或轻或重,术后影响亦或轻或重,但均未见统计学差异。3例直肠癌患者施行miles氏手术,术后出现明显IL-2量下降,sIL-2R量增高,持续时间长。因此,初步说明创伤大的手术在一定程度上影响机体的IL-2/sIL-2R系统。并可从中发现规律,采取措施,具有一定的临床价值。     

Effect of RGD coating on osteocompatibility of PLGA-polymer disks in a rat tibial wound

Osteocompatibility of porous polylactic-glycolic acid (PLGA) disks coated with synthetic peptides was assessed in 5-mm diameter unicortical tibial osseous wounds in rats. The coatings consisted of various ratios of peptides including the tripeptide arginine-glycine-aspartic acid (RGD) and the inactive arginine-glycine-glutamic acid (RGE). When left empty, the tibial wounds healed spontaneously with proliferation of intramedullary woven bone within 1 week. The reactive bone was resorbed, and by 3 weeks, the cortical wound was healed with lamellar bone, and the medullary space was repopulated with marrow. When PLGA disks were implanted there was a delay in repair with reduced bone fill and no bone bridging at 3 weeks. When disks were coated with increasing amounts of RGD peptide, there was a biphasic effect on osteocompatibility and on osseous ingrowth. Evaluation at 10 days showed a dose-dependent increase, with 1.5-fold greater osteocompatibility (p < 0.05) and 1.6-fold more osseous ingrowth into the polymer (p < 0.01) than uncoated disks. With more RGD and with undiluted RGE, osteocompatibility and osseous ingrowth were the same as with uncoated disks. At 3 weeks, there were no significant differences among all the groups. These data indicate that RGD coating enhanced early stages of osteocompatibility and ingrowth.