免疫球蛋白及 CD3+、CD4+、CD19+、CD4+/CD8+在难治性支原体肺炎患儿诊治及预后的应用意义

目的 分析免疫球蛋白及CD3+、CD4+、CD19+、CD4+/CD8+在难治性支原体肺炎患儿病情及预后中的应用意义.方法 将2020年1月至2021年5月鞍山市中心医院收治的95例支原体肺炎患儿作为支原体肺炎组,按不同病情程度分为难治组(35例)与普通组(60例),难治组患儿为难治性支原体肺炎,普通组患儿为普通性支原...     

CD4+CD25+Foxp3+调节性T细胞与慢性乙型肝炎病毒感染的关系

目的 探讨调节性T细胞（Treg）在慢性乙型肝炎病毒感染中的免疫调节作用。方法 采用流式细胞术检测慢性活动性肝炎患者、乙型肝炎病毒携带者、乙型肝炎恢复者及健康对照者外周血CIN^＋T细胞中的CIN^＋CD25^＋Foxp3^＋调节性T细胞的比例。采用免疫组织化学法检测肝组织中Foxp3的表达。统计分析外周血中CIN^＋CD25^＋Foxp3^＋调节性T细胞的比例数与血清HBeAg和HBVDNA含量的关系。结果 外周血CIN^＋T细胞中CIN^＋CD25^＋Foxp3^＋调节性T细胞的比例数在慢性活动型肝炎组和乙型肝炎病毒携带组均高于健康对照组（P〈0．05），乙型肝炎病毒携带者组高于乙型肝炎恢复组（P〈0．05）。Foxp3在慢性活动型肝炎组肝组织中的阳性率和阳性细胞数均高于乙型肝炎病毒携带者组（P〈0．05）。外周血HBeAg（＋）患者Treg的比例数高于血清HBeAg（-）患者Treg的比例数（t=1．67．P〈0．05）。患者外周血CIN^＋CD25^＋Foxp3^＋Treg的比例数与血清HBV DNA含量呈正相关（r=0．56，P〈0．01）。结论 CIN^＋CD25^＋Foxp3^＋调节性T细胞可能与乙型肝炎病毒感染慢性化及乙型肝炎病毒的清除有关。     

In vitro induced CD4+CD25+Foxp3+ Tregs attenuate hepatic ischemia–reperfusion injury

Reperfusion injury causes liver dysfunction after warm or cold ischemia. Emerging data suggest a role of T cells as mediators in this ischemia/reperfusion (I/R) injury. In the T cells, a part of CD4⁺CD25⁺FoxP3⁺ T regulatory cells (Tregs) were reported to facilitate recovery from I/R injury. These Tregs can be induced by TGF-β in vitro. Interestingly, rapamycin was reported to selectively expand these Tregs in vitro. In the present study, addition of rapamycin to cultures containing TGF-β further increased the frequency and absolute number of functional CD4⁺ Tregs. Using a partial (70%) hepatic warm ischemia model, we investigated the effects of liver function recovery under the treatment of Tregs induced by rapamycin and TGF-β. The treatment of Tregs significantly reduced serum alanine aminotransferase and aspartate aminotransferase compared to I/R control animals at 24 h after reperfusion (P < 0.05). They also significantly attenuated the up-regulation of IFN-γ and IL-17 compared to the I/R control animals (P < 0.05). In conclusion, Tregs ameliorate the biochemical of hepatic I/R injury by preventing proinflammatory cytokines following a warm I/R insult. These data may pave the way to use Tregs as cell therapy to prevent hepatic I/R injury.     

CD4+CD25+Foxp3+调节性T细胞在急性白血病患者外周血的表达

目的 初步探讨CD4 CD25 调节性T细胞在急性白血病(AL)患者外周血中的表达及其临床意义.方法 流式细胞术分别检测43例AL初诊(A组)、经化疗完全缓解(CR,B组)25例及20例健康志愿者(C组)外周血中CD4 CD25 T细胞所占比例;荧光定量RT-PCR分析各组外周血中叉状头/翅膀状螺旋转录因子(Foxp3)mRNA的表达水平,并逐层分析比较.结果 B组CD4 CD25 T细胞比例及Foxp3含量均明显高于A、C组(P＜0.01).A组Foxp3表达明显高于C组(P＜0.01).在AL各亚型之间CD4 CD25 T细胞及Foxp3表达均无显著差异.结论 CD4 CD25 调节性T细胞在初治AL或CR患者外周血中比例增加,可能是AL免疫抑制的一个重要原因.     

雷帕霉素诱导大鼠体内CD4+CD25+FoxP3+调节性T细胞的增殖

目的 探讨雷帕霉素(RPM)对大鼠CD4+CD25+FoxP3调节性T细胞的影响.方法 大鼠20只随机均分为两组:实验组RPM 2 mg·kg-1·d-1灌胃2周;对照组用生理盐水替代.无菌件下下腔静脉采血,并分离脾脏及胸腺,制备单个核细胞悬液.采用流式细胞术检测大鼠外周血、脾脏及胸腺内CD4+CD25+T细胞的占单个核细胞的比例,实时定量-PCR检测脾脏细胞FoxP3 mRNA表达,ELISA检测外周血血清转化生长因子β(TGF-13)和白细胞介素10(IL-10)含量.结果 实验组外周血、脾脏和胸腺中CD4+CD25+T细胞的比例明显高于对照组(P＜0.05).实验组大鼠脾脏细胞FoxP3 mRNA表达为对照组的4.1倍.实验组TGF-β和IL-10显著高于对照组(P＜0.05).结论 RPM能诱导大鼠体内CD4+CD25+FoxP3+调节性T细胞增殖,且增加体内免疫抑制性细胞因子TGF-β和IL-10的分泌.     

拉米夫定联合前列地尔对慢性肝炎患者CD3~+ CD25~+ Foxp3~+调节T细胞水平的影响

目的观察拉米夫定联合前列地尔治疗慢性乙型肝炎(CHB)的疗效及对CD3+ CD25+ Foxp3+调节T细胞水平的影响。方法 2010-2013年我院收治的148例慢性乙型肝炎患者随机分为实验组和对照组,每组74例,两组均接受综合保肝治疗和前列地尔注射,在此基础上实验组口服拉米夫定,对照组口服阿德福韦酯,观察两组患者HBV-DNA阴转率、ALT及CD3+ CD25+ Foxp3+调节T细胞水平变化。结果治疗后两组患者ALT水平均呈下降趋势,实验组在6、12、24、72周时显著低于对照组,差异有统计学意义(P<0.05)。治疗后两组患者HBV-DNA阴转率均逐渐升高,在24周后实验组显著高于对照组(P<0.05)。在中度、重度CHB治疗后,实验组Treg水平显著低于对照组(P<0.05)。结论拉米夫定联合前列地尔能有效抗病毒,保护肝细胞,对慢性乙型肝炎有较好的治疗效果,能显著降低CD3+ CD25+ Foxp3+调节T细胞水平。     

初诊2型糖尿病患者CD4+CD25+FoxP3+调节性T细胞的变化和意义

目的 探讨CD4+CD25+FoxP3+调节性T细胞(Treg细胞)在2型糖尿病(T2DM)发生、发展中的作用.方法 应用细胞膜打孔和三色荧光标记流式细胞术检测46例初诊T2DM患者胰岛素强化治疗前后的CD4+CD25+FoxP3+Treg细胞的比例,并分析其与细胞因子的相关性.结果 胰岛素强化治疗3个月后,CD4+CD25+FoxP3+Treg细胞的比例和CD3+T、CD4+T细胞均较治疗前明显升高,C反应蛋白(C-RP)和肿瘤坏死因子α(TNF-α)水平较治疗前降低(P<0.05).治疗前后CD4+CD25+FoxP3+Treg细胞的比例与CD3+、CD4+、TNF-α自细胞介素6(IL-6)、胰岛素抵抗指数(HOMA-IR)、胰岛细胞功能指数(HOMh-β)均无明显相关性.治疗前,CD3+T细胞百分比与CD4+T细胞百分比、IL-6水平与HOMA-β成正相关(P<0.05).治疗2周时,TNF-α与HOMA-IR和HOMA-β成正相关,而IL-6与C-RP成负相关(P<0.05).结论 初诊T2DM患者存在CD4+CD25+FoxP3+Treg细胞数量的紊乱,胰岛素强化治疗后CD4+CD25+FoxP3+Treg细胞较治疗前显著升高.低水平的Treg细胞一方面可能是T2DM发生发展的因素,另一方面可能是高血糖的结果.     

变应性鼻炎患者外周血CD4+CD25+Treg及Foxp3的检测及意义

目的 通过检测变应性鼻炎(AR)患者外周血中调节性T细胞(Treg)的含量,并与正常健康人外周血中Treg含量作比较,探讨Treg在AR患者发病过程中的作用机制.方法 30例AR患者为试验组(8周未用抗组胺、糖皮质激素),15例正常健康人为对照组,采用流式细胞术分别检测以上受试对象外周血中Treg的含量,结果以CD4+CD25+Treg、CD4+CD25highTreg及Foxp3占外周血T细胞的百分比表示.结果 AR患者外周血Treg含量明显低于正常人( P<0.05).结论 AR患者外周血Treg细胞比例明显减少,是变应性鼻炎的发病机制之一.     

雷帕霉素诱导Balb/c小鼠CD4~+ CD25~+ foxp3~+调节性T细胞增殖

目的探讨雷帕霉素对Balb/c小鼠CD4+ CD25+ foxp3+调节性T细胞的作用。方法取8wk龄的SPF级Balb/c小鼠30只,随机分为两组,实验组每只灌胃雷帕霉素0.4mg.d-1,对照组灌胃每天予等体积无菌水,共3wk。无菌条件下肝素抗凝心脏采血,分离脾脏,制备单细胞悬液。采用流式细胞仪检测小鼠外周血和脾细胞CD4+CD25+T细胞,实时定量PCR检测小鼠脾细胞foxp3 mRNA的表达。结果实验组小鼠外周血和脾细胞中CD4+CD25+T细胞的比例分别为(9.95±4.65)%和(24.13±10.06)%,对照组小鼠外周血和脾细胞中CD4+CD25+T细胞的比例分别为(5.01±1.49)%和(8.48±3.19)%,差异均有显著性(P<0.01)。实验组小鼠脾细胞foxp3 mRNA的表达水平明显高于对照组,是对照组的6.029倍,差异有显著性(P<0.01)。结论雷帕霉素能够明显诱导Balb/c小鼠体内CD4+CD25+T细胞的增殖,并能提高foxp3+ mRNA的表达。     

TF3-H4对CD4~+CD25~+调节性T细胞和CD4~+CD25~-效应性T细胞早期活化的影响

目的观察1',2',3',7'-四氢茶黄素-3,3'-双没食子酸酯(TF3-H4)对CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞早期活化的影响,分析TF3-H4对两群功能相反的CD4+T细胞的作用。方法免疫磁珠分离BALB/c小鼠脾脏CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞,加入ConA或PDB,和TF3-H4共同孵育12 h后收集细胞,流式细胞仪分析细胞表面早期活化标志CD69的表达。结果在ConA和PDB的作用下,两群细胞早期活化标志CD69的表达均升高。TF3-H4(20 mg.L-1)不能抑制PKC激动剂PDB激活的CD4+CD25-效应性T细胞CD69的表达,却能抑制ConA激活的CD4+CD25-效应性T细胞CD69表达;同时,TF3-H4也能明显抑制ConA激活的CD4+CD25+调节性T细胞的CD69表达。结论茶黄素衍生物TF3-H4可能经由TCR活化途径的上游抑制CD4+CD25-效应性T细胞活化;TF3-H4对CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞早期活化的抑制作用,可能是该类化合物发挥抗炎、抗肿瘤作用的机制之一。     

Changes of CD4+CD25+FOXP3 + and CD8+CD28 − regulatory T cells in non-small cell lung cancer patients undergoing surgery

Little is known about the regulatory T cells (Tregs) in the peripheral blood after surgery of non-small cell lung cancer (NSCLC) patients. In this study, we investigated whether CD4+CD25+FOXP3 + and CD8+CD28 − regulatory T cells are decreased in the peripheral blood of NSCLC patients undergoing surgery. The study group (n = 49) comprised NSCLC, and the control group (n = 24) consisted of age- and sex-matched nonmalignant diseases. The prevalence of CD4+CD25+FOXP3 + and CD8+CD28 − Tregs was analyzed using flow cytometry. The study group showed significantly higher percentage of CD4+CD25+FOXP3 + and CD8+CD28 − Tregs than control. The percentage of CD4+CD25+FOXP3 + and CD8+CD28 − Tregs increased with tumor stage. One way ANOVA test shows the significant differences between all subgroups. LSD test shows that there was a statistical significance between each of the two subgroups except stage II in CD4+CD25+FOXP3 + Tregs and control vs. each stage, stage I vs. stage III, and stage IV in CD8+CD28 − Tregs. There is no significant difference among stages II, III, and IV in CD8+CD28 − Tregs. No differences were found between squamous carcinoma and adenocarcinoma. These levels were dropped significantly after operation. Furthermore postoperative Treg percentage in the early stages (stage I and stage II) was not statistically different from that of controls. Postoperative Treg percentage in advanced stage (III + IV) remained above the values shown by controls. Our findings indicate that the percentage of CD4+CD25+FOXP3 + and CD8+CD28 − Tregs correlated with the pathological stage in NSCLC and tumor burden.     

造血移植物中CD3~+CD8~(low)和CD3~+CD4~-CD8~(low)细胞亚群的检测及分析

目的检测造血移植物(正常人骨髓、脐血及动员后外周血)中CD3+CD8low和CD3+CD4-CD8low细胞亚群,探讨其促进造血干/祖细胞植入异基因骨髓的功能,以期拓宽脐血移植的应用范围。方法直接三色免疫荧光标记流式细胞术检测。结果CD3+CD8low和CD3+CD4-CD8low细胞亚群占CD3+细胞亚群的比例在骨髓中最高,为(8.61±1.40)%,动员后外周血次之,为(5.11±0.76)%,脐血最低,为(3.31±0.88)%(P<0.01);"初始"T(CD45RA+CD45RO-)细胞亚群占CD8low细胞亚群的比例为脐血(94.26±2.46),骨髓(58.68±7.57),动员后外周血(73.21±3.60),"初始"T占CD8high细胞亚群的比例为脐血(82.63±3.16),骨髓(38.69±3.24),动员后外周血(51.58±4.23),各移植物中"初始"T细胞亚群占CD8low细胞亚群的比例均高于其占CD8high细胞亚群的比例(P<0.01),CD8low细胞亚群中"初始"T与"记忆"T(CD45RA-CD45RO+)细胞亚群的比例均高于二者在CD8high细胞亚群的比例。结论脐血CD8low和CD8lowCD4-细胞占CD3+细胞的比例明显低于骨髓,可能是脐血移植植入延迟的原因之一;"初始T与"记忆"T细胞亚群的比例增高,可能与CD3+CD8low细胞亚群维持和诱导免疫耐受,不引起移植物抗宿主病有关。     

CD4+CD25+调节性T细胞与儿科疾病

古希腊特尔斐阿波罗神庙上镌刻着一句铭言:Gnothi Seauton(英文为know thyself)即"认识自己"."认识自己"已成为免疫学家广为认可的定律:机体免疫系统首先必须识别自身的抗原,产生无反应性,再针对外来抗原产生免疫应答,即"识别自身,排斥异己".     

支气管哮喘患者外周血CD3^+、CD4^+、CD8^+、HLA-DR细胞含量与疾病严重程度的关系研究

目的探讨支气管哮喘患者外周血CD3^+、CD4^+、CD8^+、HLA-DR细胞含量与疾病严重程度的关系。方法80例支气管哮喘患者,随机分为试验组(急性发作期患者)及对照组(非急性发作期患者),各40例。采用流式细胞仪检测并比较两组患者外周血CD8^+、CD3^+、CD4^+、CD4^+/CD8^+、HLA-DR细胞水平。结果试验组CD8^+、CD3^+、HLA-DR细胞水平分别为(36.35±4.16)%、(1365.90±301.40)%、(1.98±0.72)%,均高于对照组的(23.41±3.63)%、(1105.90±381.40)%、(1.59±0.71)%,CD4^+、CD4^+/CD8^+细胞水平分别为(22.52±3.41)%、(0.61±0.62),均低于对照组的(30.31±2.93)%、(1.30±0.55),差异均具有统计学意义(P<0.05)。结论CD3^+、CD4^+、CD8^+、HLA-DR细胞在支气管哮喘的发生和发展中起着重要作用,其水平可用于评价支气管哮喘的严重程度。     

系统性红斑狼疮患者外周血CD4~+调节性T细胞CD25~+和FOXP3~+的表达及意义

目的探讨系统性红斑狼疮(SLE)患者外周血单个核细胞(PBMC)中CD4+T细胞CD25和FOXP3的表达及其临床意义。方法流式细胞术检测20例SLE患者(9例为狼疮性肾炎)及10例健康对照组PBMC中CD4+T细胞中CD25及Foxp3的表达。结果 SLE患者CD4+CD25highT细胞中FOXP3+T细胞的表达明显低于健康对照组(P<0.05),与SLE疾病活动指数SLEDAI积分明显负相关(r=-0.514,P<0.01),与补体C4正相关(r=0.362,P<0.05),与ESR及CRP负相关(r分别=-0.23、-0.216,P<0.05),与外周血免疫球蛋白IgG、IgA、IgM及补体C3水平无明显相关性。将SLE患者分为狼疮性肾炎(LN)组及非肾损(SLE-NR)组,两组CD4+CD25highT细胞及CD4+CD25lowT细胞中FOXP3+T细胞的表达均明显低于健康对照组(P<0.05);LN组CD4+T细胞中CD25high及CD25low的表达均较SLE-NR组增高(P<0.05)。结论 SLE患者外周血中CD4+CD25high T细胞中FOXP3+的表达水平明显降低,且与疾病活动性相关,而LN患者代偿增高的无FOXP3表达的CD4+CD25+T细胞可能与其发病机制有关。     

Inhibitor of PI3Kγ ameliorates TNBS-induced colitis in mice by affecting the functional activity of CD4+CD25+FoxP3+ regulatory T cells

BACKGROUND AND PURPOSE

Phosphoinositide 3-kinase-γ (PI3Kγ) is implicated in many pathophysiological conditions, and recent evidence has suggested its involvement in colitis. In the present study, we investigated the effects of AS605240, a relatively selective PI3Kγ inhibitor, in experimental colitis and its underlying mechanisms.

EXPERIMENTAL APPROACH

Acute colitis was induced in mice by treatment with trinitrobenzene sulphonic acid (TNBS), and the effect of AS605240 on colonic injury was assessed. Pro-inflammatory mediators and cytokines were measured by immunohistochemistry, elisa, real time-polymerase chain reaction and flow cytometry.

KEY RESULTS

Oral administration of AS605240 significantly attenuated TNBS-induced acute colitis and diminished the expression of matrix metalloproteinase-9 and vascular endothelial growth factor. The colonic levels and expression of IL-1β, CXCL-1/KC, MIP-2 and TNF-α were also reduced following therapeutic treatment with AS605240. Moreover, AS605240 reduced MIP-2 levels in a culture of neutrophils stimulated with lipopolysaccharide. The mechanisms underlying these actions of AS605240 are related to nuclear factor-κ (NF-κB) inhibition. Importantly, the PI3Kγ inhibitor also up-regulated IL-10, CD25 and FoxP3 expression. In addition, a significant increase in CD25 and FoxP3 expression was found in isolated lamina propria CD4⁺ T cells of AS605240-treated mice. The effect of AS605240 on Treg induction was further confirmed by showing that concomitant in vivo blockade of IL-10R significantly attenuated its therapeutic activity.

CONCLUSIONS AND IMPLICATIONS

These results suggest that AS605240 protects mice against TNBS-induced colitis by inhibiting multiple inflammatory components through the NF-κB pathway while simultaneously inducing an increase in the functional activity of CD4⁺CD25⁺ Treg. Thus, AS605240 may offer a promising new therapeutic strategy for the treatment of inflammatory bowel diseases.