基于肿瘤基因作用的妊娠妇女调节性免疫细胞与巨细胞病毒的相关性研究

研究基于肿瘤基因作用的妊娠妇女调节性免疫细胞与巨细胞病毒的相关性。收集2015年5月~2016年9月四川省人民医院就诊的妊娠患者,病例纳入标准:年龄范围在22~40岁;初次妊娠患者;排除前置胎盘、先兆流产和妊娠高血压等异常妊娠患者;排除合并慢阻肺、糖尿病、艾滋病等慢性疾病患者;排除艾滋病和乙肝病毒等感染患者;排除长期吸烟、酗酒患者。梯度离心的方法分离患者外周血的淋巴细胞。CD4、CD25和Foxp3流式抗体标记调节性T细胞(Treg细胞);CD19和TGF~-β流式抗体标记调节性B细胞(Breg细胞);CD4、CXCR5和Foxp3流式抗体标记滤泡调节性T细胞(Tfr细胞)。结果表明,对照组共有30例正常妊娠患者,年龄在22岁至37岁之间;CMV感染组包括30名CMV感染的妊娠患者,年龄在22岁至39岁之间。CMV感染组中CD4~+CD25~+Foxp3~+的Treg细胞、CD19~+TGF~-β~+的Breg细胞和CD4~+CXCR5~+Foxp3~+的Tfr细胞比例均显著的低于对照组,分别下降了31.9%、78.5%和65.1%,结果具有统计学差异(P0.05)。CMV感染后,妊娠患者体内Treg细胞、Breg细胞和Tfr细胞等调节性免疫细胞的比例均显著下降,可能对胎儿的生长发育造成影响。     

抑郁状态对患者调节性T细胞和调节性B细胞的作用研究

目的:探讨抑郁状态对患者调节性T细胞(Treg细胞)和调节性B细胞(Breg细胞)的作用。方法:收集入住我院40名抑郁患者,同时将来我院进行体检的40名健康志愿者作为对照组。分离各组的淋巴细胞,CD4、CD25和Foxp3标记Treg细胞,CD3、CD19和TGF-β标记Breg细胞,之后流式检测各组细胞的比例。结果:流式结果显示CD4+的辅助T细胞比例在抑郁组和对照组之间没有显著的差别(P0.05);抑郁组中CD4+CD25+Foxp3+的Treg细胞的比例显著的高于对照组,升高了52.3%,结果具有统计学差异(P0.05);CD3-CD19+的B细胞比例在抑郁组和对照组之间没有显著的差别(P0.05);相对于对照组,抑郁组CD3-CD19+TGF-β+的Breg细胞比例显著升高,增加了91.7%,结果具有统计学差异(P0.05)。结论:抑郁患者体内Treg细胞和Breg细胞显著升高,引起机体免疫低下,我们的研究为了解神经和免疫的相关性提供了一定的理论参考。     

消化道肿瘤患者外周血调节性T细胞的变化及其意义

目的:通过测定外周血CD4+CD25+Foxp3+调节性T(Treg)细胞比例,探讨其与消化道肿瘤发生、发展的关系.方法:采用流式细胞术(FCM)检测156例消化道恶性肿瘤患者(消化道恶性肿瘤组)与50名健康体检者(对照组)的外周血中CD4+CD25+Foxp3+Treg细胞的水平,并进行比较分析.结果:消化道肿瘤患者CD4+CD25+Foxp3+Treg比例明显高于对照组(P<0.01),且随疾病进展恶性肿瘤患者外周血CD4+CD25+Foxp3+Treg细胞的比例升高.结论:CD4+CD25+Foxp3+Treg在消化道肿瘤患者外周血中比例升高,提示其可能是癌症患者细胞免疫功能削弱的机制之一,与消化道肿瘤的发生和发展密切相关.     

非霍奇金淋巴瘤患者外周血中CD4+CD25+ 调节性T 细胞 亚群变化初探

目的:检测非霍奇金淋巴瘤(non-Hodgkin’s lymphoma,NHL)患者外周血中CD4+CD25+调节性T细胞(CD4+CD25+regulatoryT cell,Treg)的改变,探讨Treg与NHL的相关性。方法:病例组(n=60)为本院收治的初诊NHL患者,对照组(n=60)为本院健康体检者,用流式细胞技术联合标记CD4、CD25检测对照组及病例组化疗前、化疗后的外周血中CD4+CD25+调节性T细胞的分布特点。结果:(1)病例组化疗前外周血中CD4+细胞比例显著低于对照组(P<0.05),CD4+CD25+调节性T细胞比例显著高于对照组(P<0.05);(2)病例组化疗后,CD4+细胞比例明显高于化疗前(P<0.05),CD4+CD25+调节性T细胞比例明显低于化疗前(P<0.05);(3)病例组化疗后CD4+细胞比例与对照组无显著差异(P>0.05),而CD4+CD25+调节性T细胞比例显著高于对照组(P<0.05)。结论:非霍奇金淋巴瘤患者外周血中CD4+CD25+调节性T细胞比例升高,存在机体免疫抑制,化疗可降低CD4+CD25+调节性T细胞比例。     

调节性T 细胞在发热结缔组织病患者外周血中的表达及临床意义

目的:研究Treg细胞在发热CTD患者外周血表达对结核感染的诊断价值。方法:对103例发热CTD患者进行T-SPOT.TB试验,将39例阳性者设为实验组-1,进行抗结核治疗,将64例阳性者设为实验组-2,另选取40例健康者作为对照组,检测三组外周血CD4+CD25+Treg细胞、Foxp3基因、IL-10、TGF-β的表达。结果:实验组CD4+CD25+Foxp3 Treg细胞占CD4+T比例高于对照组(P0.05),实验组-1治疗前外周血CD4+CD25+Foxp3 Treg细胞占CD4+T比例高于实验组-1治疗后、实验组-2(P0.05);实验组TGF-β表达量低于对照组(P0.05),实验组-1治疗前低于实验组-1治疗后及实验组-2(P0.05);实验组-1治疗前IL-10表达量低于实验组-1治疗后、实验组-2及对照组(P0.05)。结论:CD4+CD25+Foxp3 Treg细胞在发热CTD伴有结核感染患者外周血中的表达升高,其变化可作为结核感染诊断的辅助性指标。     

SLE带状疱疹患者外周血CD4~+CD28~+和CD4~+CD25~+FoxP3~+调节性T细胞的表达及相关性研究

目的:检测系统性红斑狼疮(systemic lupus erythematosus,SLE)合并带状疱疹患者外周血CD4~+CD28~+和CD4~+CD25~+Fox P3~+调节性T细胞的表达及相关性,探讨其在SLE合并带状疱疹发病中的临床意义。方法:采用流式细胞术检测30例SLE患者、30例SLE合并带状疱疹患者及30例健康对照者外周血中CD4~+/CD8~+T淋巴细胞亚群表面CD28的表达及CD4~+CD25~+Fox P3~+Treg细胞的表达水平,并分析SLE合并带状疱疹患者外周血CD4~+CD28~+和CD4~+CD25~+Fox P3~+调节性T细胞表达的相关性。结果:SLE合并带状疱疹组患者急性期外周血CD4~+T淋巴细胞比率、绝对计数显著降低,CD4~+、CD8~+T淋巴细胞表面的CD28表达下调,CD4~+CD25~+Fox P3~+Treg细胞水平显著高于SLE组及健康对照组,SLE合并带状疱疹组患者外周血CD4~+CD25~+Fox P3~+Treg水平与CD4~+CD28~+水平成负相关(P均0.05)。结论:SLE合并带状疱疹患者CD4~+、CD8~+T细胞活化异常,CD4~+CD25~+Fox P3~+Treg细胞可能参与抑制了T细胞的活化。     

哮喘患者外周血Treg和Th1/Th2的变化及其与哮喘病情的关系

目的:探讨哮喘患者外周血调节性T细胞(Treg)以及辅助性T细胞(Th1/Th2)的比例的变化,探讨其在哮喘的临床治疗中的作用。方法:80例哮喘患者(哮喘组)按临床表现分为急性发作期组(54例)和缓解期组(26例),同时选择50例健康体检者。应用流式细胞仪检测上述各组外周血CD4+CD25+Foxp3+Treg、CD4+IFN-γ+Th1和CD4+IL-4+Th2细胞水平,并进行统计学分析。结果:哮喘组CD4+CD25+Foxp3+Treg水平亦明显低于正常对照组(P<0.05。其中急性发作期组Treg水平明显低于缓解期组和正常对照组(P<0.05)。而哮喘组Th1/Th2比值显著低于对照组(P<0.05),且在哮喘急性发作组中Th1/Th2比值显著低于缓解期组和正常对照组(P<0.05)。结论:提示Treg和Th在哮喘的发生和发展中起着重要的作用。     

嗜血细胞综合征患儿外周血CD_4~+CD_(25)~+调节性T细胞变化及临床意义

目的观察嗜血细胞综合征(hemophagocytic syndrome,HPS)患儿外周血中调节性T细胞(RegulatoryTcells,Treg细胞)的变化,探讨其在HPS发病中的作用及临床意义。方法应用流式细胞仪检测17例初诊HPS患者(初诊组)、11例经诱导治疗后临床缓解者(缓解组)及20例健康人群(对照组)外周血中CD4+CD25+调节性T细胞。结果与对照组相比较,HPS患者初诊组及缓解组外周血CD4+CD25+调节性T细胞均升高(P0.05)。与初诊组相比较,缓解组CD4+CD25+Treg细胞降低(P0.05),但仍高于正常对照组(P0.05)。结论CD4+CD25+Treg细胞增多可能是HPS患者免疫功能受抑的重要原因之一,其变化对于HPS的预后判断有一定的意义。     

口服益生菌对妊娠期糖尿病小鼠肠道菌群及调节性免疫细胞的影响

目的探讨口服益生菌对妊娠期糖尿病小鼠肠道菌群及调节性免疫细胞的影响。方法 C57BL/6小鼠30只,分为对照妊娠组(正常妊娠小鼠)、妊娠期糖尿病组(妊娠期糖尿病小鼠)和益生菌组(妊娠期糖尿病小鼠每日在食物中添加益生菌),每组10只。妊娠期糖尿病组和益生菌组20只小鼠构建妊娠期糖尿病小鼠模型;ATB半自动微生物检测系统检测粪便中双歧杆菌、大肠埃希菌和乳杆菌的含量;收集小鼠的心脏血,流式细胞术检测CD4~+CD25~+Foxp3~+调节性T细胞(Treg细胞)、CD4~+CXCR5~+Foxp3~+滤泡调节性T细胞(Tfr细胞)和CD19~+IL-10~+调节性B细胞(Breg细胞)在淋巴细胞中的比例;ELISA检测血清中IL-6、肿瘤坏死因子α(TNF-α)、白介素10(IL-10)和转化生长因子-β(TGF-β)的浓度。结果妊娠期糖尿病组小鼠粪便中双歧杆菌、大肠埃希菌和乳杆菌的含量分别为(5.600±0.922 3)、(10.050±0.769 3)和(4.750±0.621 2)LgCFU(每克粪便湿重中菌落形成单位数的对数值),益生菌组分别为(12.770±1.764 0)、(6.667±0.691 2)和(7.367±0.373 9)LgCFU,两组之间差异有统计学意义(t=3.600,P=0.004 9;t=3.271,P=0.008 4;t=3.609,P=0.004 8);妊娠期糖尿病组淋巴细胞中Treg细胞、Tfr细胞和Breg细胞比例分别为(0.032 0±0.005 35)%、(0.338 7±0.045 51)%和(0.058 8±0.015 81)%,益生菌组为(0.185 0±0.064 33)%、(0.600 3±0.083 26)%和(0.118 2±0.012 90)%,两组之间差异有统计学意义(t=2.370,P=0.039 3;t=2.758,P=0.020 2;t=2.907,P=0.015 6);ELISA结果显示妊娠期糖尿病组小鼠血清中IL-6、TNF-α、IL-10和TGF-β浓度分别为(45.33±5.649)、(470.00±50.130)、(3.43±0.541)和(0.33±0.055)ng/mL,益生菌组为(22.33±4.128)、(223.30±41.280)、(9.05±1.953)和(1.35±0.366)ng/mL,两组之间差异有统计学意义(t=3.287,P=0.008 2;t=3.798,P=0.003 5;t=2.771,P=0.019 8;t=2.766,P=0.019 9)。结论调控肠道菌群可促进妊娠期糖尿病小鼠Treg细胞、Tfr细胞和Breg细胞比例增加,减少炎症反应和维持正常妊娠,研究为妊娠期糖尿病的治疗提供了一个新的方法。     

慢性阻塞性肺疾病患者外周血CD4+CD25+CD127(Low/-)调节性T细胞的检测及临床意义

目的:研究CD4+CD25+CD127(Low/-)节性T细胞在慢性阻塞性肺疾病(COPD)急性发作期外周血中的比例改变及其临床意义.方法:以25例COPD急性发作期患者外周血为研究组,20名正常人外周血作为对照组,采用三色直接荧光素标记法和多参数流式细胞仪检测外周血CD4+CD25+CD127(Low/-)调节性T细胞的比例,同时检测外周血C-反应蛋白(CRP)、血沉(ESR)、免疫球蛋白(Ig)等水平.结果:COPD急性发作期患者外周血CD4+CD25+CD127(Low/-)调节性T细胞占外周血CD4+淋巴细胞的比例明显低于健康对照组(P＜0.01).而COPD急性发作期患者外周血CRP、ESR、Ig等水平明显高于健康对照组(P＜0.05).COPD患者外周血调节T细胞下降与CRP和IgG升高成负相关.结论:COPD患者外周血CD4+CD25+CD127(Low/-)调节性T细胞在CD4+T淋巴细胞的比例明显减少,调节性T细胞等免疫调节因素可能在COPD的发病机制发挥重要作用.     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.