巨噬细胞自噬在动脉粥样硬化发病中作用的研究进展

<正>自噬是真核细胞利用溶酶体降解细胞内受损的细胞器及蛋白等大分子物质的过程,在营养缺乏、组织缺氧、氧化应激、DNA损伤等环境压力下被激活。机体可通过自噬回收利用内源性细胞成分(氨基酸、游离脂肪酸、核苷酸)以维持细胞稳态~([1])。动脉粥样硬化(AS)是以脂质积累、炎症细胞浸润为特征的慢性炎症过程。巨噬细胞能够摄取脂蛋白,使脂质积聚,形成泡沫细胞,并释放多种酶和炎性介质,影响AS斑块进展。斑块中巨噬细胞凋亡以及胞葬作用缺陷,也会促进斑块坏死,从而导致斑块的不稳     

Lycium barbarum extract promotes M2 polarization and reduces oligomeric amyloid-β-induced inflammatory reactions in microglial cells

Lycium barbarum(LB)is a traditional Chinese medicine that has been demonstrated to exhibit a wide variety of biological functions,such as antioxidation,neuroprotection,and immune modulation.One of the main mechanisms of Alzheimer’s disease is that microglia activated by amyloid beta(Aβ)transform from the resting state to an M1 state and release pro-inflammatory cytokines to the surrounding environment.In the present study,immortalized microglial cells were pretreated with L.barbarum extract for 1 hour and then treated with oligomeric Aβfor 23 hours.The results showed that LB extract significantly increased the survival of oligomeric Aβ-induced microglial cells,downregulated the expression of M1 pro-inflammatory markers(inducible nitric oxide synthase,tumor necrosis factorα,interleukin-6,and interleukin-1β),and upregulated the expression of M2 anti-inflammatory markers(arginase-1,chitinase-like protein 3,and interleukin-4).LB extract also inhibited the oligomeric Aβ-induced secretion of tumor necrosis factorα,interleukin-6,and interleukin-1βin microglial cells.The results of in vitro cytological experiments suggest that,in microglial cells,LB extract can inhibit oligomeric Aβ-induced M1 polarization and concomitant inflammatory reactions,and promote M2 polarization.     

不同手术方法治疗复杂胫骨平台骨折临床疗效观察

目的探讨不同手术方法治疗复杂胫骨平台骨折临床疗效。方法选择2016年1月—2018年12月84例复杂胫骨平台骨折患者,随机分组。单侧锁定钢板内固定组选择单侧锁定钢板内固定手术,双侧切口双侧解剖钢板内固定组选择双侧切口双侧解剖钢板内固定。分析手术操作时间、手术失血、平均住院天数以及复杂胫骨平台骨折愈合时间;治疗前后患者视觉模拟评分和Rasmussen膝关节功能评分;膝关节僵硬发生率。结果双侧切口双侧解剖钢板内固定组视觉模拟评分和Rasmussen膝关节功能评分、手术操作时间、手术失血、平均住院天数以及复杂胫骨平台骨折愈合时间、膝关节僵硬发生率和单侧锁定钢板内固定组比较有优势,P<0.05。结论复杂胫骨平台骨折患者实施双侧切口双侧解剖钢板内固定可获得较好效果。     

癌基因ras的表达抑制抗体交联物诱导的胃癌细胞凋零

凋零又称程序性细胞死亡,是细胞普遍具有的一种自我消亡机制,是细胞对外界信号刺激所作出的一种主动性死亡应答反应,是细胞的“自杀”。近年来的研究表明,凋零不但是正常生理性控制过程之一,同时也是化疗、放疗等抗肿瘤疗法杀伤瘤细胞的重要途径。因此,阐明凋零是否参与抗体交联物的细胞毒效应这一问题,对于深刻理解导向治疗的机理将具有重要的理论与实际意义。     

香港多伤员车祸的特征分析

在世界各地，车祸是创伤的主要原因。这种情况在香港不例外，在香港发生的车祸每年约有15000宗．造成约18000人伤亡（图1），其中包括约150人死亡及3000人以上重伤。本研究的目的是收集1999～2004年这5a车祸资料，将涉及多伤员的车祸情况加以分析，找出这类车祸的风险因素并讨论干预前景。     

钙通道阻滞的分类

目前,钙通道阻滞剂有几十种之多,按其化学结构和对钙通道的选择性阻断,可分为选择性和非选择性两大类;按其临床应用可分为三类:1.有确切疗效;2.有较好疗效;3.有一定疗效,尚待证实。     

尽力而为的成长

凯佑从1月份开始上体操课,到了4月底,教练就想要他升班,从一级跳到四级,从每周一小时的课程增加到每周两堂、每堂一个半小时。我犹豫了,儿子吃得消吗?我向教练要求让凯佑先尝试一堂课。一试吓一跳,能进这个班可不简单。不愧为培养出美国奥林匹克选手的体操馆,据家长们言,这个少儿四级体操训练课程是本地区最好的。班上的6个男孩,从5岁半到9岁,都是同龄中的体操高手,他们都练过1年以上的体操,有的还聘请过私人教练。凯佑才满6岁,“体操龄”又短暂,他跟得上吗?我有些担心地问教练。他答,没问题,两     

NEUROTROPIN IMMUNOSTIMULATING ACTION ON IMMUNOCOMPETENT CELLS

Neurotropin (NSP) is an extract isolated from the skin of rabbits inoculated with vaccinia virus. The present study examines the possible action of NSP on the number and function of immunocompe tent cells in mice. The experiment showed that NSP had no effect on both T and B lymphocytes of nor- malimmunized mouse spleen. The degree of plaque forming cell reaction and titre of specific antibody showed no significant differences when the NSP treated group and controls were compared. How- ever, NSP exhibited promotive effect on specific antigen binding cells in the early stage of immune responses. It was also noted that the rosette forming capacity of human T lymphocytes in vitro was restor- ed markedly by NSP. These results suggest that NSP possesses certain immunostimulating activity, particularly on the specific antigen binding cells and human T lymphocytes.