CD4~+ CD25~+ Treg细胞对AIED小鼠治疗效果及免疫分子调控机制的研究

目的探究CD4~+CD25~+Treg细胞对自身免疫性内耳疾病(AIED)小鼠的治疗效果及免疫分子调控机制。方法复制AIED小鼠模型,分离得小鼠脾脏Treg细胞,纯化扩增,通过尾静脉输入到观察组小鼠体内,检测小鼠外周血中Th17和CD4~+CD25~+Treg细胞比率、脑干诱发电位、外周血清中白细胞介素(IL)-2和IL-6水平。结果模型组和观察组AIED小鼠模型复制后的Th17和CD4~+CD25~+Treg细胞比率、脑干诱发电位、IL-2和IL-6水平均显著性的高于模型复制前(P0.05);观察组输入1周后外周血中的Th17细胞比率、脑干诱发电位、IL-2和IL-6显著性的低于模型复制后(P0.05),观察组输入1周后CD4~+CD25~+Treg细胞显著性的高于模型复制后(P0.05)。结论CD4~+CD25~+Treg细胞对AIED小鼠有保护作用,其作用机制可能是抑制过强的自身免疫反应。     

慢性阻塞性肺疾病患者外周血Th17/CD25+Foxp3+Treg比率的变化

目的:研究慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)患者外周血中CD25~+Foxp3~+Treg和Th17细胞介导的免疫失衡与该疾病进展之间的相关性。方法:选择2012年1月至2015年3月在上海市闵行区江川社区及复旦大学附属上海市第五人民医院接受门诊或住院治疗的稳定期和急性发作期COPD患者共69例,同时收集吸烟或不吸烟的健康对照者各20例。测定受试者的肺功能。采用流式细胞术测定受试者外周血中Th17和CD25~+Foxp3~+Treg占CD4~+细胞的百分比,分析Th17/CD4~+和CD25~+Foxp3~+Treg/CD4~+比率以及Th17/CD25~+Foxp3~+Treg比值在不同分组中的变化及其临床意义。结果:与健康对照组相比,稳定期COPD患者外周血中Th17/CD4~+和Th17/CD25~+Foxp3~+Treg明显升高(P0.05),而CD25~+Foxp3~+Treg/CD4~+明显降低(P0.05);急性发作期COPD患者的Th17/CD4~+、CD25~+Foxp3~+Treg/CD4~+和Th17/CD25~+Foxp3~+Treg均比对照组明显升高(P0.05)。轻度、中度、重度和极重度的COPD患者中Th17/CD4~+和Th17/CD25~+Foxp3~+Treg逐步升高(P0.05),而CD25~+Foxp3~+Treg/CD4~+逐步降低(P0.05);COPD患者的Th17/CD4~+和Th17/CD25~+Foxp3~+Treg与肺功能负相关(P0.05),CD25~+Foxp3~+Treg/CD4~+与肺功能正相关(P0.05)。结论:Th17/CD25~+Foxp3~+Treg失衡参与了COPD的疾病进展过程,提示Th17/CD25~+Foxp3~+Treg免疫调节治疗可能成为COPD治疗的新途径。     

致敏小鼠CD4~+ CD25~+调节性T细胞磁珠分选及体外扩增

本研究探讨致敏小鼠CD4+ CD25+调节性T细胞的分选及体外扩增。流式细胞术检测致敏小鼠及正常小鼠体内CD4+ CD25+ Treg细胞水平,免疫磁珠分选方法从小鼠脾细胞中分选出CD4+T细胞、CD4+ CD25+ Treg细胞和CD4+ CD25-T细胞,负载抗CD3/CD28单克隆抗体MACSiBead联合IL-2共同刺激CD4+ CD25+ Treg细胞进行体外扩增培养,用0.4%台盼蓝染色并计数检测细胞的活性,流式细胞术检测分选后细胞纯度、主要表面标记及Foxp3基因的表达。结果表明:致敏小鼠体内CD4+ CD25+ Treg水平较正常小鼠升高(P<0.05)。分选出CD4+ CD25+ Treg细胞纯度平均达到87%,细胞活性大于97%,高表达Foxp3基因。体外扩增2周后细胞数扩增倍数能够达到42倍,CD4+ CD25+ Treg细胞所占比例为85.32%,Foxp3表达由(76.92±1.72)%稍下降至(75.33±2.11)%(P>0.05)。结论:免疫磁珠分选法能够分选出高纯度的CD4+ CD25+ Treg细胞,该分选方法不影响分选靶细胞的细胞活力;体外成功扩增了CD4+ CD25+ Treg细胞,扩增后的CD4+ CD25+ Treg细胞表面标记及Foxp3基因表达无明显改变。     

霉酚酸酯诱导Balb/c小鼠调节性T细胞的分化和增殖

目的:观察霉酚酸酯对Balb/c小鼠调节性T细胞(regulatory T cells,Treg)分化和增殖的影响,进一步探讨其可能的免疫耐受诱导机制。方法:取8周龄的SPF级Balb/c小鼠24只,随机分为3组,霉酚酸酯组(MMF组):每只灌胃霉酚酸酯40mg/(kg·d),环孢素组(CsA组):每只灌胃CsA10mg/(kg·d),对照组:灌胃每天予等体积生理盐水。3周后眼眶静脉取血,无菌条件下分离脾脏,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+Treg细胞,免疫组化法检测小鼠脾脏Foxp3蛋白的表达。结果:霉酚酸酯组小鼠外周血和脾细胞中CD4+CD25+Treg细胞的比例分别为(6.35±0.09)%和(11.62±1.10)%,CsA组小鼠外周血和脾细胞中CD4+CD25+Treg细胞的比例分别为(2.57±0.09)%和(5.46±0.75)%,对照组小鼠外周血和脾细胞中CD4+CD25+Treg细胞的比例分别为(4.64±0.13)%和(7.61±0.73)%,差异均有显著性(P<0.01)。霉酚酸酯组小鼠脾脏Foxp3蛋白的表达水平明显高于对照组,差异有显著性(P<0.01),CsA组小鼠脾脏Foxp3蛋白的表达水平明显低于对照组。结论:霉酚酸酯能够明显诱导Balb/c小鼠体内CD4+CD25+Treg细胞的增殖,并能提高Foxp3蛋白的表达,有利于免疫耐受的形成,其免疫抑制机制与CsA不同。     

CD4~+ CD25~+ T细胞在脂多糖诱导多器官功能障碍综合征小鼠中的保护作用研究

目的探索CD4+CD25+T细胞在脂多糖(lipopolysaccharide,LPS)诱导的多器官功能障碍综合征(multiple organ dysfunction syndrome,MODS)小鼠中的作用。方法选择雄性BALB/c小鼠,以LPS 9.0 mg/kg腹腔注射制备小鼠MODS模型作为建模组(60只),对照组小鼠(10只)同法注射0.9%氯化钠注射液,应用流式细胞术在第2、5天分别检测两组小鼠体内CD4+CD25+T细胞水平;选择180只小鼠,于-2 d分别腹腔注射磷酸盐缓冲液、IgG1及200μg Anti-CD25 mAb,再于0 d注射LPS分别建立LPS组、IgG1+LPS组和Anti-CD25 mAb+LPS组小鼠模型,每组60只,计算各组CD4+CD25+T细胞百分比,并取各组小鼠肺脏组织行HE染色,观察组织细胞学改变;再建立LPS组小鼠54只,IgG1+LPS组小鼠34只,Anti-CD25 mAb+LPS组小鼠32只,观察3组小鼠的生存率。结果建模组小鼠CD4+CD25+T细胞比例与对照组相比,在2 d时下降(t=2.873,P=0.006),在5 d时上升(t=2.963,P=0.004)。Anti-CD25 mAb+LPS组注射LPS后2 d、5 d CD4+CD25+T细胞比例均下降,与其余两组比较差异均有统计学意义(P均0.01)。肺组织HE染色结果提示中和CD4+CD25+T细胞会加重LPS诱导MODS小鼠的肺部损伤,并增加小鼠的死亡率。结论 CD4+CD25+T细胞在LPS诱导的MODS中起保护作用。     

甲状腺乳头状癌患者外周血CD4~+CD25~+Foxp3~+调节性T细胞及T-钙粘蛋白的检测及临床意义

目的研究CD4~+CD25~+Foxp3~+调节性T细胞(Treg)与T-钙黏蛋白在甲状腺乳头状癌(PTC)外周血中的水平及临床意义。方法采用回顾性研究方法,选取PTC患者40例(观察组)以及甲状腺腺瘤患者40例(对照组)。对比两组患者外周血CD4~+CD25~+Foxp3~+Treg细胞比率及T-钙黏蛋白水平;对比不同病理特征下CD4~+CD25~+Foxp3~+Treg细胞比率及T-钙黏蛋白水平有无差异。结果 PTC组患者CD4~+CD25~+Foxp3~+Treg细胞比率及T-钙黏蛋白水平均明显高于对照组(P0.05),TNMⅢ、Ⅳ期与存在颈部淋巴结转移的PTC患者CD4~+CD25~+Foxp3~+Treg细胞与T-钙黏蛋白水平均明显升高(P0.05)。结论 CD4~+CD25~+Foxp3~+Treg细胞与T-钙黏蛋白可以作为PTC的标志物,同时与患者临床分期以及淋巴结转移有密切的相关性。     

卵巢癌患者外周血Treg细胞检测及临床意义

目的探讨卵巢癌患者外周血淋巴细胞亚群及CD4~+CD25~+调节性T细胞(regulatory T cell,Treg)表达水平的变化及其临床意义。方法采用流式细胞术检测48例卵巢癌患者外周血标本中Treg细胞占CD4~+T淋巴细胞的比率及淋巴细胞亚群分布,分析Treg细胞与卵巢癌患者临床病理参数之间的关系。结果与健康人对照组相比,卵巢癌患者外周血标本中CD3~+、CD4~+T淋巴细胞及CD4~+/CD8~+比值均升高(P均0.01),且Treg细胞占CD4~+T淋巴细胞的比率明显升高(P0.01),而CD16~+CD56~+NK细胞的表达水平显著降低(P0.01);卵巢癌患者外周血标本中Treg细胞占CD4~+T淋巴细胞的比率与患者年龄、组织类型、肿瘤大小、淋巴结转移及是否合并CA125升高均无关(P0.05),而与FIGO分期、分化程度及是否存在腹水密切相关(P0.05)。结论检测外周血Treg细胞可用于评估卵巢癌患者的病情进展。     

调节性T细胞对脓毒症中T淋巴细胞凋亡的影响

目的:探讨CD4~+CD25~+调节性T细胞(CD4~+CD25~+Treg)对脓毒症过程中效应性T细胞(Teff)凋亡的影响。方法:应用SPF级健康雄性BALB/C小鼠制备盲肠结扎穿孔术(CLP)脓毒症模型。小鼠随机分为正常对照组、假伤组、CLP组、CLP+PC61(Treg特异性抑制剂)组、CLP+HRPN(PC61的同型对照蛋白IgG)组。免疫磁珠法分选小鼠脾脏CD4~+CD25~+Treg。采用流式细胞术观察T淋巴细胞毒性相关抗原(CTLA)-4及转录因子叉头翼状螺旋转录因子(Foxp3)表达以及CD25比例的变化,并检测各组小鼠CD4+CD25-T细胞的凋亡率。ELISA法检测外周血中白细胞介素(IL)-10、IL-2、IL-4和干扰素(IFN)-γ的含量变化。结果:CLP+PC61组术后48h小鼠生存率(90%)较CLP组(60%)明显升高;CLP+PC61组CD4~+CD25~+Treg中Foxp3及CTLA-4表达恢复至正常对照组水平,与CLP组差异有统计学意义(P0.05),并且CLP+PC61组CD25表达水平最低。CLP+PC61组IL-2、IFN-γ水平显著升高,与CLP组差异明显(P0.05),但IL-4、IL-10水平较CLP组出现不同程度地下降(P0.05)。此外,CLP+PC61组效应性T细胞凋亡率明显低于CLP组(P0.05)。结论:拮抗小鼠体内调节性T细胞活性可有效地减轻脓毒症状态下效应性T细胞凋亡,提高小鼠生存率。     

初诊多发性骨髓瘤患者外周血淋巴细胞亚群的检测及意义

目的:通过检测多发性骨髓瘤(multiple myeloma,MM)患者外周血淋巴细胞亚群评价MM患者机体的免疫功能状态并分析其与患者预后的相关性。方法:采用流式细胞术检测32例初诊MM患者和24例健康献血者的外周血T淋巴细胞、B淋巴细胞、NK细胞及CD4~+CD25~+调节性T细胞(CD4~+CD25~+Treg);分别采用溴甲酚绿法、透射免疫比浊法检测患者血清白蛋白(albumin,Alb)、β2-微球蛋白(β2 microglobulin,β2-MG)。结果:与健康献血者比较,MM患者外周血淋巴细胞中CD3~+、CD4~+T淋巴细胞比例无显著改变(P0.05),CD8~+T淋巴细胞、NK细胞比例升高(P0.05),CD4~+/CD8~+T淋巴细胞比值、CD19~+B淋巴细胞比例降低(P0.05),CD4~+CD25~+Treg细胞占CD4~+T淋巴细胞的比例明显升高(P0.01)。CD4~+CD25~+Treg细胞占CD4~+T淋巴细胞的比例与MM的疾病分期呈正相关,与MM患者血清中的β2-MG浓度亦呈正相关(P0.05)。结论:MM患者体内在淋巴细胞亚群的异常表达可能与其肿瘤负荷、病情进展及预后有关。CD4~+CD25~+Treg细胞的表达异常可能是MM免疫逃逸的一个重要机制。     

桥本甲状腺炎患者外周血CD4~+ CD25~+ Foxp3~+调节性T细胞及IL-10的检测及临床意义

目的评价检测桥本甲状腺炎(HT)患者外周血CD4~+CD25~+Foxp3~+调节性T细胞(Treg)及白细胞介素-10(IL-10)的临床意义。方法选择30例临床确诊初次发病HT患者作为观察组,另选择30例同时期年龄、性别匹配的健康体检者作为对照组,均抽取空腹静脉血,采用流式细胞术测定外周血CD4~+CD25~+Treg占CD4~+T细胞的百分比、CD4~+CD25~+Foxp3~+Treg占CD4~+T细胞的百分比以及CD4~+CD25~+Foxp3~+Treg占CD4~+CD25~+Treg的百分比,采用酶联免疫吸附实验检测IL-10水平。结果两组的外周血CD4~+CD25~+Treg占CD4~+T细胞的百分比差异无统计学意义(P0.05);观察组的外周血CD4~+CD25~+Foxp3~+Treg占CD4~+T细胞的百分比、CD4~+CD25~+Foxp3~+Treg占CD4~+CD25~+Treg的百分比均明显低于对照组(P0.05);观察组的IL-10水平显著低于对照组(P0.05)。结论桥本甲状腺炎患者的外周血CD4~+CD25~+Foxp3~+调节性T细胞比例、IL-10水平低于健康人群;推测CD4~+CD25~+Foxp3~+Treg、IL-10可能参与了桥本甲状腺炎的发病。     

CD4+CD25+Foxp3+ Tregs resolve experimental lung injury in mice and are present in humans with acute lung injury

Acute lung injury (ALI) is characterized by rapid alveolar injury, inflammation, cytokine induction, and neutrophil accumulation. Although early events in the pathogenesis of ALI have been defined, the mechanisms underlying resolution are unknown. As a model of ALI, we administered intratracheal (i.t.) LPS to mice and observed peak lung injury 4 days after the challenge, with resolution by day 10. Numbers of alveolar lymphocytes increased as injury resolved. To examine the role of lymphocytes in this response, lymphocyte-deficient Rag-1^–/– and C57BL/6 WT mice were exposed to i.t. LPS. The extent of injury was similar between the groups of mice through day 4, but recovery was markedly impaired in the Rag-1^–/– mice. Adoptive transfer studies revealed that infusion of CD4⁺CD25⁺Foxp3⁺ Tregs as late as 24 hours after i.t. LPS normalized resolution in Rag-1^–/– mice. Similarly, Treg depletion in WT mice delayed recovery. Treg transfer into i.t. LPS–exposed Rag-1^–/– mice also corrected the elevated levels of alveolar proinflammatory cytokines and increased the diminished levels of alveolar TGF-β and neutrophil apoptosis. Mechanistically, Treg-mediated resolution of lung injury was abrogated by TGF-β inhibition. Moreover, BAL of patients with ALI revealed dynamic changes in CD3⁺CD4⁺CD25^hiCD127^loFoxp3⁺ cells. These results indicate that Tregs modify innate immune responses during resolution of lung injury and suggest potential targets for treating ALI, for which there are no specific therapies currently available.     

内皮源性toll样受体4在急性肺损伤中的作用

目的 探索内皮源性或髓源性细胞表面toll样受体4(TLR4)介入急性肺损伤(ALI)的作用. 方法 采用TLR4基因突变(C3H/HeJ品系,TLR4mut/mut)及野生型(C3H/HeN,TLB4+/+)小鼠,通过骨髓移植建立"内皮细胞TLR4+/+髓系细胞TLR4mut/mut"(WT/Mutant:受体/供体)及Mutant/WT嵌合体小鼠,尾静脉注射LPS(5 mg·kg-1)复制ALI模型,5 h后测肺组织湿干重比(W/D),肺通透指数(LPI),肺组织髓过氧化物酶(MPO)水平、炎症因子及黏附分子水平. 结果 TLR4mut/mut小鼠肺损伤较TLR4+/+小鼠较轻,WT/Mutant组小鼠肺组织损伤较Mutant/WT组重,且WT/Mutant组与WT/WT组差异无统计学意义.WT/Mutant组小鼠肺组织MPO水平、ICAM-1表达水平较Mutant/WT组高,且ICAM-1表达水平WT/Mutant组小鼠与WT/WT小鼠比较差异无统计学意义.炎症因子TNF-α、IL-1β的水平Mutant/WT组较WT/Mutant组高. 结论 内皮源性TLR4通过调控黏附分子表达而促进PMN肺组织招募,在介导LPS诱导的ALI中的发挥核心作用.     

白细胞介素-6/糖蛋白130/转录激活因子3通路在百草枯诱导小鼠急性肺损伤中的作用机制

目的基于肺特异性白细胞介素-6(IL-6)敲除小鼠研究IL-6/糖蛋白130(gp130)/转录激活因子3(STAT3)通路在百草枯(PQ)诱导急性肺损伤(ALI)中的作用。方法野生型C57BL/6J小鼠分为IL-6野生型(IL-6 WT)组、IL-6 WT+PQ组,采用Sftpc(肺表面活性蛋白C基因)-Cre⁺小鼠与IL-6^FLOX/FLOX小鼠交配的方式得到肺特异性IL-6敲除小鼠并分为IL-6 KO组、IL-6 KO+PQ组,单次腹腔注射PQ诱导ALI,比较四组小鼠肺组织病理改变、肺泡动脉氧分压差(PA-aO₂)、肺组织湿/干质量比值(W/D)、IL-6/gp130/STAT3通路、核转录因子-κB(NF-κB) p65、肿瘤坏死因子-α(TNF-α)及白细胞介素-1β(IL-1β)的差异。结果与IL-6 WT组比较,IL-6 WT+PQ组小鼠肺组织出现了典型的ALI病理改变,肺组织胞浆蛋白中IL-6、gp130、p-STAT3、TNF-α、IL-1β表达水平及胞核蛋白中NF-κB p65的表达水平、PA-aO₂、W/D明显增加(P <0.05);与IL-6 WT+PQ组比较,IL-6 KO+PQ组小鼠肺组织病理改变明显改善,肺组织胞浆蛋白中IL-6、gp130、p-STAT3、TNF-α、IL-1β的表达水平及胞核蛋白中NF-κB p65的表达水平、PA-aO₂、W/D明显降低(P <0.05)。结论 IL-6/gp130/STAT3通路激活与PQ诱导ALI有关。     

Chronic plasminogen activator inhibitor-1 (PAI-1) overexpression dampens CD25+ lymphocyte recruitment after lipopolysaccharide endotoxemia in mouse lung

BACKGROUND: Plasma plasminogen activator inhibitor-1 (PAI-1) level rises during sepsis and confers a worse prognosis. PAI-1 participation to sepsis has been poorly documented and was mainly associated with fibrin deposits. Beside fibrin deposits, increased tissue PAI-1 expression may contribute to the poor outcome of endotoxemia through other mechanisms. OBJECTIVE AND METHODS: During lipopolysaccharide (LPS) challenge, the role of PAI-1 in the early phase of inflammation was examined in the lungs of transgenic mice that either overexpress or lack the PAI-1 gene (PAI-1Tg or PAI-1(-/-)). RESULTS: Analysis of leukocytes revealed that neutrophil and macrophage infiltrations did not differ for PAI-1Tg and wild-type (WT) mice. Remarkably, CD25+ lymphocyte infiltration was totally blunted in PAI-1Tg lungs and inversely correlated with fibrin depositions. In parallel, mRNA levels of the regulatory T cell (Treg) markers FoxP3, CTLA-4, and GITR were significantly lower in PAI-1Tg than in WT lungs after LPS challenge. These data are supported by opposite results in PAI-1(-/-) lungs. The systemic compartments (spleen and peripheral blood) showed no decrease in CD25+, CD4+ CD25+ lymphocytes, and Treg markers in PAI-1Tg mice after LPS injection compared with WT mice. In addition, plasma and lung concentrations of interleukin-6 (IL-6) and macrophage inflammatory protein-1alpha (MIP-1alpha) were significantly higher in PAI-1Tg mice than WT mice. CONCLUSION: Our results suggest that chronic tissue PAI-1 overexpression influences the early phase of the inflammatory response during endotoxemia through the control of T lymphocyte traffic.     

Direct effects of protein S in ameliorating acute lung injury

Summary. Objective: Protein S may exert an anticoagulant activity by enhancing the anticoagulant activity of activated protein C and/or by directly inhibiting the prothrombinase complex. Protein S itself may also directly regulate inflammatory responses and apoptosis. The role of protein S in acute lung injury (ALI) was unknown. This study evaluated the effect of protein S on ALI in the mouse. Methods: Animal ALI was induced in C57/BL6 mice by intratracheal instillation of lipopolysaccharide (LPS). Mice were treated with protein S or saline by intraperitoneal injection 1 h before LPS instillation. Results: Activated protein or protein S alone and combined activated protein C + protein S therapy decreased inflammatory markers and cytokines in mice with acute lung injury. In LPS‐treated mice compared with controls ALI was induced as shown by significantly increased levels of total protein, tumor necrosis factor‐α, interleukin‐6 and monocyte chemoattractant protein‐1 in the bronchoalveolar lavage fluid. Mice with ALI treated with protein S had significantly decreased concentrations of tumor necrosis factor‐α and interleukin‐6 in the lung compared with untreated animals. Thrombin‐antithrombin III, a marker of the activity of the coagulation cascade, was unchanged. Protein S inhibited the expression of cytokines in vitro and increased activation of the Axl tyrosine kinase pathway in A549 epithelial cells. Conclusion: Protein S protects against LPS‐induced ALI, possibly by directly inhibiting the local expression of inflammatory cytokines without affecting coagulation.     

IL-13在急性肺损伤小鼠肺内的表达及其意义研究

[目的]观察急性肺损伤(ALI)小鼠肺内白介素-13(IL-13)表达及其在肺损伤炎症反应中的作用.[方法]采用气管注射脂多糖(LPS)复制ALI小鼠ALI动物模型,采用real-time PCR和ELISA法分别检测小鼠肺内IL-13 mRNA和支气管肺泡灌洗液(BALF)以及血清中IL-13含量.采用IL-13中和抗体预处理小鼠后,观察其对LPS诱导的小鼠ALI的炎症反应的影响,运用ELISA法检测小鼠BALF和血清中肿瘤坏死因子-α(TNF-α)和IL-1β的含量,HE染色观察肺组织形态学改变.[结果]与对照组相比,气管注射LPS诱导的ALI小鼠肺组织中IL-13 mRNA以及BALF和血清IL-13蛋白含量显著增加.与ALI组相比,IL-13中和抗体预处理组小鼠肺内TNF-α和IL-1β含量进一步增高,肺组织形态学损伤加重.[结论]ALI时小鼠肺内IL-13含量应激性增加,抑制IL13的受体活性,加重LPS诱导的小鼠ALI,提示IL-13是ALI内源性保护因子.     

内毒素致急性肺损伤大鼠肺组织信号转导和转录激活因子1的调控作用

目的 探讨信号转导和转录激活因子1(STAT1)在内毒素致急性肺损伤(ALI)大鼠肺组织中的表达及其调控作用.方法 静脉注射内毒素脂多糖(LPS)制备大鼠ALI模型.将动物随机分为对照组、LPS组、地塞米松(DEX)干预组;DEX干预组灌胃DEX 0.135 mg/kg,对照组和LPS组分别灌胃等量生理盐水,连用5 d后LPS组和DEX干预组经尾静脉注射LPS 5 mg/kg,对照组以生理盐水1 ml替代.于致伤后1、2、4、8、16 h各处死6只大鼠,取肺组织,用蛋白质免疫印迹法(Western blotting)测定STAT1表达的动态变化,光镜下观察肺组织病理学改变.结果 与对照组比较,LPS组STAT1的活化从1 h开始增高,4 h达高峰,然后逐渐下降;2、4、8 h时STAT1表达显著升高(P均<0.01);DEX干预组STAT1表达趋势同LPS组,但2、4、8 h时STAT1表达显著低于LPS组(P均<0.05).结论 内毒素致ALI中存在STAT1异常表达;STAT1参与了肺组织炎症的形成.     

CD4+CD25+调节性T细胞在特发性血小板减少性紫癜患者中的变化

目的探讨CD4^＋CD25^＋T细胞在特发性血小板减少性紫癜（ITP）患者发病机制中的作用。方法应用流式细胞术检测ITP患者外周血CD4^＋CD25^＋T细胞、CD4^＋CD25^highT细胞、CD4^＋FOXP3^＋T细胞、CD4^＋CD25^＋FOXP3^＋T细胞的数量；实时荧光定量PCR检测外周血FOXP3 mRNA的表达水平。将ITP患者和正常人CD4^＋CD25^highT细胞与自身CD4^＋CD25^-T细胞混合培养，检测CD4^＋CD25^high T细胞免疫抑制功能。结果ITP患者外周血中CD4^＋CD25^＋T细胞约占CD4^＋T细胞的（15．64±5．82）％，明显高于正常对照组（9．30±3．95）％（P〈0．01），CD4^＋CD25^high T细胞比例为（1．53±0．66）％，与对照组[（1．36±0．55）％]比较差异无统计学意义（P〉0．05）；CD4^＋FOXP3^＋T细胞和CD4^＋CD25^＋FOXP3^＋T细胞分别为（1．82±1．42）％和（1．25±0．94）％，均明显低于对照组[（3．90±1．37）％和（2．65±0．92）％]（P值均〈0．01）。ITP患者外周血FOXP3 mRNA表达水平较正常人明显下调（P〈0．01），CD4^＋CD25^high T细胞的抑制活性较正常人减弱（P〈0．01）。结论ITP患者中CD4^＋CD25^＋T细胞FOXP3表达水平降低，抑制活性减弱。     

内毒素肺损伤小鼠肺内清道夫受体A表达的变化

目的 观察内毒素肺损伤发病中小鼠肺组织及肺泡巨噬细胞(AM)清道夫受体A(SR-A)表达的变化.方法 腹腔注射内毒素脂多糖(LPS)复制小鼠急性肺损伤模型,实验分为LPS致伤后0.5、1、2、4和8 h组及对照组,用小鼠AM株J774A.1细胞作体外实验,分为LPS作用后0.5、1、2、4和8 h组及无血清培养液对照组.用免疫组化及流式细胞仪观察分析小鼠肺组织及AM、J774A.1细胞的SR-A表达及分布.结果 LPS各组小鼠动脉血氧分压(PaO2)均明显低于对照组,且肺湿/干重(W/D)比值明显高于对照组(P均＜0.01).对照组小鼠肺组织除支气管上皮细胞、淋巴细胞无SR-A表达外,AM、肺血管内皮细胞、血管平滑肌细胞、肺泡上皮细胞、中性粒细胞胞膜及胞质均有SR-A表达.LPS致伤后0.5 h即可观察到肺组织SR-A免疫组化染色弱于对照组,并且随着致伤时间延长,染色逐渐变浅,表明内毒素肺损伤发病中肺内SR-A表达减少.用J774A.1细胞作体外实验也发现类似结果,以4 h和8 h组降低最为显著.流式细胞仪检测AM及J774A.1细胞的SR-A表达与免疫组化染色结果相符,且细胞膜SR-A下降较细胞总SR-A显著.结论 内毒素肺损伤小鼠肺组织及AM的SR-A表达减少,其表达变化可能与内毒素作用有关.