T细胞免疫防治BXSB小鼠系统性红斑狼疮的实验研究

目的 :探索用自身反应性 T细胞免疫防治 BXSB雄性小鼠发生类似人系统性红斑狼疮 (SL E)的可行性。方法 :用活化的 BXSB小鼠自身反应性 T细胞克隆 (ATL 1)从小鼠尾静脉注射进行免疫 (1× 10 6 /只 ,共 3次 ) ,然后从不同角度监测病情发展情况。 结果 :在免疫后的第 1、2、4周 ,T细胞免疫组小鼠血清中抗 ds DNA抗体水平明显低于对照组 (P<0 .0 1) ,在免疫后第 4、8、12、16周 ,T细胞免疫组小鼠的死亡率明显低于对照组 (P<0 .0 5 ) ,但是两组尿蛋白的浓度在各时间段均未见显著差异。结论 :T细胞免疫能在一定程度上延缓 BXSB小鼠 SL E的进程 ,延长小鼠的生存时间。其机制可能与 T细胞免疫诱导了针对自身反应性 T细胞的调节性免疫应答有关。     

Analysis of CD4^＋CD25^＋ Regulatory T Cells and Foxp3 mRNA in the Peripheral Blood of Patients with Asthma

The changes of CD4 CD25 regulatory T cells (CD4 CD25 Treg) and Foxp3 mRNA in peripheral blood mononuclear cells (PBMCs) from patients with asthma were investigated in order to elucidate the possible roles of CD4 CD25 Treg in the development of asthma. The peripheral blood samples were collected from 29 healthy controls (normal control group) and 78 patients with asthma which included 30 patients in exacerbation group, 25 patients in persistent group, and 23 patients in remission group. By using flow cytometry and RT-PCR, the CD4 CD25 Treg ratio and Foxp3 mRNA in PBMCs were detected. The CD4 CD25 Treg ratio and Foxp3 mRNA in PBMCs of exac-erbation and persistent groups were lower than that of remission and normal control groups (P<0.05). Although the CD4 CD25 Treg ratio and Foxp3 mRNA of remission group were also lower than that of normal control group, there was no significant difference between them (P>0.05). As compared with persistent group, exacerbation group had lower CD4 CD25 Treg ratio and Foxp3 mRNA (P<0.05). It was indicated that the decrease of CD4 CD25 Treg ratio and its function in PBMCs may be responsible for pathogenesis of asthma.     

成人微小病变肾病患者外周血CD4+Foxp3+调节性T细胞的研究

目的 研究CD4+Foxp3+调节性T细胞（CD4+Foxp3+Treg）及亚群在成人微小病变肾病（MCD）患者外周血CD4+T细胞中的分布,探讨CD4+Foxp3+Treg参与MCD发病的可能机制。方法 以27例经肾穿刺活检确诊为MCD的初发成人患者作为研究对象,采用Foxp3-FITC/CD45RA-PE/CD3-ECD/CD4-PC7抗体组合经流式细胞仪检测外周血单个核细胞（PBMCs）中CD4+Foxp3+Treg及亚群占CD4+T细胞的百分比。Real-Time PCR检测PBMCs中Foxp3、Th17转录因子RORc以及细胞因子TGF-β1、IL-6、IL-17A 、IL-23 mRNA表达。设立正常对照。结果 流式细胞检测显示CD4+Foxp3+Treg分成3个细胞群体,分别为CD45RA+Foxp3low(Ⅰ区,静息期Treg)、CD45RA-Foxp3high（Ⅱ区,活化Treg)和CD45RA-Foxp3low(Ⅲ区)。MCD组Ⅰ区+Ⅱ区细胞和Ⅱ区细胞占CD4+T细胞的百分比显著低于对照组（P<0.01）。MCD组PBMCs中Foxp3 mRNA表达较对照组下调（P<0.05）,RORc mRNA表达较对照组上调（P<0.05）,IL-6、IL-17A、IL-23 mRNA表达均显著高于对照组（P<0.05和P<0.01）。相关性分析显示,MCD组IL-17A mRNA表达与Ⅱ区细胞占CD4+T细胞的百分比呈显著负相关（r=－0.81,P<0.05）。结论 成人MCD患者外周血Treg及其活化功能亚群减少,同时伴有Th17转录基因及其相关细胞因子表达的异常升高。提示Treg Foxp3 mRNA表达下调及Treg/Th17细胞比例失衡可能与MCD的发病有关。     

慢性乙型肝炎中CD4+ CD25+ T调节细胞水平的判定

目的:了解慢性乙型肝炎(CHB)患者CD4 CD25 T调节细胞(Tregs)的真实水平. 方法: 采用细胞内外三色荧光标记、流式细胞仪测定、RT-PCR等方法检测CHB患者外周血中Tregs的主要标志CD4 CD25 ,CD4 CD25h,CD4 CD25 Foxp3 细胞和Foxp3 mRNA水平,并观察其与患者肝功能、乙肝病毒复制标志的相关性. 结果: CHB外周血中CD4 CD25 细胞水平与正常无明显差异,CD4 CD25h/PBMC(外周血单个核细胞)则较正常对照组升高[(0.5±0.3) vs (1.1±0.6), P＜0.05],而CD25 Foxp3 /CD4 T细胞比值及Foxp3 mRNA水平则较正常明显降低[(4.5±2.7) vs (7.1±2.3)]. RT-PCR结果: △CT:13.98 vs 12.86, △△CT: 1.12 vs 0, 2-△△CT: 0.46 vs 1, P＜0.05. 外周血中CD25h T细胞水平与谷丙转氨酶呈正相关(r=0.5,P＜0.05),T细胞中CD25(包括高表达)阳性比例与Foxp3阳性的符合率明显低于正常人[(30.5±16.7) vs (54.6±11.1);(57.9±15.9 ) vs (87.8±13.5), P＜0.01]. 结论: CHB患者存在着Tregs细胞水平的异常,CD25h的阳性率易受炎症时非调节性T细胞激活而过多表达CD25分子影响,Foxp3作为Tregs判定指标较为可靠.     

1,25二羟基维生素D_3对大鼠脾CD4~+CD25~+调节性T细胞及Foxp3基因表达的影响

目的:探究1,25二羟基维生素D3[1,25(OH)2D3]对大鼠脾CD4 CD25 调节性T细胞(Treg)及其特异性转录因子Foxp3基因表达的影响.方法:近交系雄性Lewis大鼠,随机分成对照组和3个剂量的VitD3组: 0.125 μg组,0.25 μg组和1 μg组,每组30只;灌胃给药,3次/周,共2周后对照组给予赋形剂;各组随机抽取20只大鼠,于第15 d腹腔注射脂多糖(LPS)(10 mg/kg),随机选择其中10只于6 h后切取脾,其余10只观察注射LPS后96 h大鼠的病死率,同时留取未注射LPS大鼠的脾;流式细胞仪检测脾CD4 CD25 Treg数量变化,RT-PCR检测脾Foxp3 mRNA表达.结果:1,25(OH)2D3明显上调大鼠脾CD4 CD25 Treg的数量及特异性转录因子Foxp3 mRNA的表达;1,25(OH)2D3能保护大鼠抵抗LPS的攻击.结论:1,25(OH)2D3对大鼠脾CD4 CD25 调节性T细胞及特异性转录因子Foxp3 mRNA的表达有显著影响.1,25(OH)2D3保护大鼠抵抗LPS攻击可能与其促进CD4 CD25 Treg的发育和功能有关.     

Foxp3 expression in CD4<Superscript>+</Superscript>CD25<Superscript>+</Superscript>Foxp3<Superscript>+</Superscript> regulatory T cells promotes development of colorectal cancer by inhibiting tumor immunity

The mechanism underlying CD4⁺CD25⁺Foxp3⁺ regulatory T cells (Tregs) promoting the development of colorectal cancer (CRC) was elucidated in the present study. Forty-eight cases of colorectal carcinomas, 22 cases of colon polyps and 21 cases of normal colorectal tissues were collected. The correlation among Foxp3, IL-10 and Stat3, and the clinical relevance of these three indexes were analyzed. The results showed that the levels of Foxp3 expressed in infiltrating CD4⁺CD25⁺Foxp3⁺Tregs, and IL-10 and Stat3 in CRC tissues were all significantly higher than those in polypus tissues and normal colon tissues (P< 0.01). Pearson correlation analysis indicated that the expression level of Foxp3 was positively correlated with Stat3 at mRNA level (r=0.526, P=0.036), and was positively correlated with IL-10 at protein level (r=0.314, P=0.030). The Foxp3 expressed in CD4⁺CD25⁺Foxp3⁺Tregs was correlated with the histological grade, lymph node metastasis and TNM stage of CRC (P<0.05 for all). The IL-10 expression was correlated with the histological grade and TNM stage (both P<0.05). The Stat3 expression was correlated with the lymph node metastasis and TNM stage (both P<0.05). It was concluded that CD4⁺CD25⁺Foxp3⁺Tregs can inhibit tumor immunity in combination with some other related inhibitory cytokines and that Foxp3 expression in CD4⁺CD25⁺Foxp3⁺Tregs correlates with CRC progression.     

左归丸对小鼠CD4+ CD25+调节性T细胞的影响

目的:观察左归丸制剂对小鼠脾细胞中Treg亚群及其相关细胞因子表达的影响。方法:BALB/c小鼠给予不同剂量左归丸处理后,利用流式细胞术检测小鼠脾细胞中Treg亚群(CD4+/CD25+)的变化;采用RT-PCR法检测小鼠脾细胞中IL-10、TGF-β、IFN-γ及Foxp3的表达水平;采用ELISA法检测小鼠外周血中IFN-γ的分泌水平。结果:小剂量左归丸对小鼠脾脏Treg亚群及相关细胞因子的表达没有显著影响;中剂量左归丸可明显上调小鼠脾脏Treg亚群比例(P<0.05),提高Treg特异性胞内信号Foxp3及相关细胞因子IL-10、TGF-β的转录水平,同时抑制IFN-γ的表达;大剂量左归丸可显著降低Treg细胞亚群比例,对Foxp3I、L-10、TGF-β、IFN-γ的表达均有明显的抑制作用(P<0.05)。随着中、大剂量左归丸处理小鼠IFN-γ的转录下调,血清中IFN-γ的水平也明显下降(P<0.05)。结论:左归丸可上调Treg细胞及相关细胞因子的表达水平,抑制IFN-γ的表达,但这种免疫效应有剂量限制性,大剂量应用时显示抑制作用,提示左归丸对Treg亚群有剂量依赖性的双向调节作用。     

寻常型天疱疮患者外周血调节性T淋巴细胞数量及Foxp3基因表达

目的研究寻常型天疱疮(PV)患者外周血调节性T淋巴细胞(Treg),即CD4 CD25 Foxp3 T细胞的数量及其Foxp3mRNA的表达水平,探讨其在PV发病机制中的作用。方法收集15例PV患者(PV组)和15名健康人(对照组)外周抗凝静脉血,分离外周血单个核细胞。分别用FITC标记抗CD4单抗,APC标记抗CD25单抗,PE标记抗Foxp3单抗,流式细胞仪检测分析PV患者外周血Treg在CD4 T细胞中的百分率及CD4 T细胞在淋巴细胞中的百分率;荧光定量PCR检测外周血单个核细胞Foxp3 mRNA表达情况。结果PV组外周血Treg在CD4 T细胞中百分率为(6.99±1.86)%,CD4 T细胞在淋巴细胞中的百分率为(32.78±8.33)%,对照组分别为(7.95±1.68)%和(33.45±7.32)%,两组比较差异无统计学意义(P>0.05);荧光定量PCR检测结果显示,PV组与对照组Foxp3 mRNA相对表达量分别为8.80±5.53和8.47±5.46,两组比较无显著差异(P>0.05)。结论调节性T细胞可能不直接参与PV的发生。     

慢性湿疹患者外周血CD4+CD25+Foxp3+调节性T细胞的检测

目的 研究外周血CD4^＋CD25^＋Foxp3^＋调节性T细胞（Treg细胞）数量改变所致的细胞免疫抑制效应在慢性湿疹发病机制中的作用.方法 采用免疫荧光标染技术,经流式细胞仪检测30例慢性湿疹患者和33例正常人外周血CD4^＋CD25^＋T细胞数量及胞内转录因子Foxp3（forkhead box p3）表达水平.结果 慢性湿疹患者外周血CD4^＋CD25^＋Foxp3^＋Treg细胞数量比正常人对照组明显下降（P＜0.001）.结论 慢性湿疹患者外周血CD4^＋CD25^＋Foxp3^＋调节性T细胞数量下降导致参与IV型变态反应的效应性T细胞功能活性增强,这可能是湿疹发病机制之一.     

CD4~+ CD25~+ Foxp3~+ Treg细胞在HBV感染所致慢加急性肝衰竭中作用

目的:探讨CD4+CD25+Foxp3+Treg细胞在HBV感染所致慢加急性肝衰竭发病过程中的表达。方法:采用流式细胞仪检测36例慢加急性肝衰竭患者、38例慢性乙型肝炎患者、40例无症状乙肝病毒携带者及40例健康对照者外周血CD4+CD25+Foxp3+Treg细胞水平,并追踪慢加急性肝衰竭组患者转归,评价好转组与未恢复组CD4+CD25+Foxp3+Treg细胞百分率差异。结果:慢加急性肝衰竭组、慢性乙型肝炎组、无症状乙肝病毒携带组及健康对照组外周血CD4+CD25+Foxp3+Treg细胞分别为(5.14±1.03)%、(9.86±1.72)%、(7.93±1.67)%及(7.06±1.61)%,慢加急肝衰竭组外周血Treg细胞百分率显著低于慢性乙型肝炎组、无症状乙肝病毒携带组和健康对照组(P<0.01)。慢性乙型肝炎组外周血Treg百分率明显高于慢加急肝衰竭组及健康对照组,差异有统计学意义(P<0.05),而无症状乙肝病毒携带组与健康对照组外周血Treg百分率比较差异无统计学意义(P>0.05)。各组CD4+CD25+Foxp3+Treg细胞的百分率与患者血清HBVDNA呈正相关。慢加急性肝衰竭好转组与未恢复组CD4+CD25+Foxp3+Treg细胞水平比较,差异无统计学意义(P>0.05)。结论:慢加急性肝衰竭患者发病可能与CD4+CD25+Foxp3+Treg细胞表达过低有关,Treg细胞表达水平不能预示慢加急性肝衰竭患者预后。     

成人微小病变肾病患者外周血CD4~＋Foxp3~＋调节性T细胞的研究

目的研究CD4＋Foxp3＋调节性T细胞（CD4＋Foxp3＋Treg）及亚群在成人微小病变肾病（MCD）患者外周血CD4＋T细胞中的分布,探讨CD4＋Foxp3＋Treg参与MCD发病的可能机制。方法以27例经肾穿刺活检确诊为MCD的初发成人患者作为研究对象,采用Foxp3-FITC/CD45RA-PE/CD3-ECD/CD4-PC7抗体组合经流式细胞仪检测外周血单个核细胞（PBMCs）中CD4＋Foxp3＋Treg及亚群占CD4＋T细胞的百分比。Real-Time PCR检测PBMCs中Foxp3、Th17转录因子RORc以及细胞因子TGF-β1、IL-6、IL-17A、IL-23mRNA表达。设立正常对照。结果流式细胞检测显示CD4＋Foxp3＋Treg分成3个细胞群体,分别为CD45RA＋Foxp3low（Ⅰ区,静息期Treg）、CD45RA-Foxp3high（Ⅱ区,活化Treg）和CD45RA-Foxp3low（Ⅲ区）。MCD组Ⅰ区＋Ⅱ区细胞和Ⅱ区细胞占CD4＋T细胞的百分比显著低于对照组（P〈0.01）。MCD组PBMCs中Foxp3mRNA表达较对照组下调（P〈0.05）,RORcmRNA表达较对照组上调（P〈0.05）,IL-6、IL-17A、IL-23mRNA表达均显著高于对照组（P〈0.05和P〈0.01）。相关性分析显示,MCD组IL-17A mRNA表达与Ⅱ区细胞占CD4＋T细胞的百分比呈显著负相关（r=-0.81,P〈0.05）。结论成人MCD患者外周血Treg及其活化功能亚群减少,同时伴有Th17转录基因及其相关细胞因子表达的异常升高。提示Treg Foxp3 mRNA表达下调及Treg/Th17细胞比例失衡可能与MCD的发病有关。     

氨甲蝶呤调控调节性T细胞数量及Foxp3表达在银屑病治疗中的作用

目的：探讨氨甲蝶呤(methotrexate,MTX)对调节性T细胞(regulatory T cells,Treg)细胞数量及关键转录因子 Foxp3 mRNA的影响。方法：1)收集初诊的寻常型银屑病患者、健康对照者和经MTX治疗8周后疗效显著的寻常型银屑 病患者入组,抽取外周抗凝静脉血并分离外周血单个核细胞(peripheral blood mononuclear cell,PBMC),采用流式细胞 术(fl ow cytometry, FCM)检测Treg细胞数量,采用实时荧光定量PCR(quantitative real-time PCR,qRT-PCR)法检测PBMC 中Foxp3 mRNA表达水平;2)将咪喹莫特(imiquimod,IMQ)连续外用在BALB/c小鼠背部,观察6 d,每天拍照记录小鼠 皮损变化,根据银屑病面积和严重程度指数(psoriasis area and severity index,PASI)进行评分,将小鼠皮损进行HE染色 观察其病理改变;3)在IMQ诱导中期(第3天)使用不同剂量MTX(38.5和77.0 nmol/L)进行小鼠腹腔内注射1次,同时设 置PBS组和阴性对照组,肉眼观察各组皮损外观并用HE染色方法观察皮损组织病理改变,观察6 d;随后采用FCM检 测小鼠脾淋巴细胞中Treg细胞数量,qRT-PCR法检测脾淋巴细胞Foxp3 mRNA表达水平。结果：1)在银屑病患者外周血 PBMC中Treg细胞数量及Foxp3 mRNA表达水平比健康对照者明显降低(P<0.05);用MTX治疗8周后疗效显著的寻常型银 屑病患者外周血Treg细胞的数量显著高于治疗前水平(P<0.05),Foxp3 mRNA表达水平显著升高(P<0.01);2)由IMQ诱 导的BALB/c小鼠表现出银屑病样的皮损外观及组织病理学改变,其脾淋巴细胞中Treg细胞数量下降(P<0.01),Foxp3 mRNA表达水平降低(P<0.05);3)使用不同剂量MTX于BALB/c小鼠腹腔内注射可有效缓解其银屑病样皮炎的皮损外 观、逆转病理改变,小鼠脾淋巴细胞Treg细胞数量部分逆转,Foxp3 mRNA表达水平增高(P<0.05)。结论：MTX可以通 过调控Treg细胞数量及Foxp3 mRNA表达水平来治疗银屑病。     

Changes of CD4^＋CD25^＋ Regulatory T Cells in Patients with Acute Coronary Syndrome and the Effects of Atorvastatin

The function of CD4＋CD25＋ regulatory T lymphocytes （Treg） in patients with acute coronary syndrome （ACS） and the effects of atorvastatin were investigated. Forty-eight patients with ACS were randomly divided into two groups： group C receiving conventional therapy （n=24）, and group C＋A receiving conventional therapy＋atorvastatin （10 mg/day, n=24）. T lymphocytes from ACS patients （before and 2 weeks after the treatment） or 18 healthy subjects were separated and the flow cytometry was used to measure the percentage of Treg. The inhibitory ability of Treg on effector T cells was determined by mixed lymphocyte reaction （MLR）. ELISA was used to measure the serum levels of cytokines （IL-10, TGF-β1 and IFN-γ） before and after treatment. The results showed that as compared with normal control group, Treg percentage was decreased significantly （P〈0.01）, the inhibitory ability of Treg on the T lymphocytes proliferation was reduced （P〈0.01）, IFN-γ levels were increased and IL-10 and TGF-β1 levels were lowered in ACS patients. After treatment with atorvastatin, Treg percentage and the inhibitory ability of Treg on T lymphocytes proliferation were significantly increased in ACS patients. Serum IFN-γ was decreased significantly, while IL-10 and TGF-β1 were elevated significantly as compared with the non-atorvastatin group. The number of Treg was positively correlated with serum TGF-β1, but negatively with serum IFN-γ and CRP. It was concluded that ACS was associated with decreased number and defected function of Treg, which may play an important role in initiating immune-inflammatory response in ACS. The inhibitory effects of atorvastatin on inflammation in ACS may be due to its beneficial effects on Treg and restoration of immune homeostasis.     

Changes of CD4＋ CD25＋ Regulatory T Cells in Peripheral Blood in Patients with Hepatocellular Carcinoma Before and after TACE

This study investigated the changes of CD4＋ CD25＋ regulatory T cells （Tregs） in periph-eral blood of patients with hepatocellular carcinoma before and after transcatheter arterial chemoem-bolization （TACE）. The proportion of CD4＋ CD25＋ Tregs among CD4＋ T lymphocytes in peripheral blood of 33 patients with hepatocellular carcinoma was determined by flow cytometry before, 1 week and 1 month after TACE. And 25 healthy volunteers served as control. One month after TACE, the patients were divided into two groups： 22 in group A, who were in stable condition or getting better; and 10 in group B, who were deteriorating. One patient died and was excluded. The results showed that the percentage of CD4＋CD25＋ Tregs among CD4＋ T lymphocytes did not significantly change in the 33 patients 1 week after TACE as compared with that before TACE, however, the difference was significant （P〈0.01） between the patients with hepatocellular carcinoma and the healthy subjects. The percentage of CD4＋ CD25＋ Tregs among CD4＋ T lymphocytes in group A 1 month after TACE was decreased significantly in comparison with that before and 1 week after TACE （P〈0.01）, whereas, that in group B was increased significantly 1 month after TACE （P〈0.01）. It was concluded that patients with hepatocellular carcinoma had a higher proportion of CD4＋CD25＋ Tregs in peripheral blood. TACE did not significantly affect the level of CD4＋ CD25＋ Tregs within short time （such as 1 week）. The proportion of CD4＋CD25＋ Tregs in peripheral blood 1 month after TACE was related to the prognosis of hepatocellular carcinoma.     

肺岩宁方对肺癌小鼠CD4＋CD25＋调节性T细胞比例及Foxp3表达的影响

目的：研究肺岩宁方对Lewis肺癌小鼠CD4＋CD25＋调节性T细胞（T regulatory cell,Treg）比例及转录因子Foxp3表达的影响。方法：建立小鼠Lewis肺癌细胞移植瘤模型后,将32只6～8周龄雄性C57BL/6小鼠随机分为模型组、中药组、化疗组和综合治疗组。给予相应药物干预14d后,观察小鼠的一般状况、饲料消耗量、体质量、去瘤体质量、移植瘤质量、肺脏指数、脾脏指数和胸腺指数,并检测各组小鼠胸腺、脾脏和移植瘤CD4＋CD25＋Treg细胞的比例及Foxp3mRNA的表达。结果：肺岩宁方可降低肺癌小鼠脾脏和胸腺指数,增加去瘤体质量,减少移植瘤质量,与模型组比较差异有统计学意义（P〈0.05）。肺岩宁方可显著降低Lewis肺癌小鼠胸腺、脾脏和移植瘤中的CD4＋CD25＋Treg细胞比例,并抑制Foxp3mRNA的表达,与模型组比较差异有统计学意义（P〈0.05）。结论：肺岩宁方通过降低CD4＋CD25＋Treg细胞比例、下调Foxp3 mRNA表达而增强机体的抗肿瘤免疫应答发挥抑瘤作用。     

前列腺癌患者外周血CD4 + CD25+调节性T细胞及FOXP3 mRNA的表达及临床意义

[摘要] 目的 探讨CD4 + CD25 +调节性T细胞和FOXP3在前列腺癌发病过程中的作用。方法 应用流式细胞术检测30例前列腺癌、40例前列腺增生患者及20例健康志愿者外周血单个核细胞(PBMC)中CD4+ CD25+ 调节性T细胞占CD4 +T细胞的比例, 应用RT-PCR技术检测人外周血PBMC FOXP3基因的表达。结果 前列腺癌患者外周血PBMC中CD4+CD25+调节性T细胞占CD4+T细胞的比例高于前列腺增生患者和健康志愿者,前列腺增生患者和健康志愿者之间差异无统计学意义（P>0.05）;前列腺癌患者外周血PBMC中FOXP3 mRNA的表达水平高于非肿瘤患者表达水平( P < 0.05) , 前列腺增生患者和健康志愿者之间差异无统计学意义（P>0.05）。 结论 CD4+CD25+调节性T细胞及其特异标志物FOXP3在维持自身免疫稳定的同时对肿瘤免疫具有抑制作用, 该细胞群比例的增加可能参与前列腺癌的发生。 结论: CD4+CD25+调节性T细胞及其特异标志物FOXP3在维持自身免疫稳定的同时对肿瘤免疫具有抑制作用, 该细胞群比例的增加可能参与前列腺癌的发生。     

肿瘤细胞对CD4~+CD25~+Treg细胞数量和功能的影响

目的：探讨肿瘤细胞与免疫细胞相互作用对CD4+CD25+Treg细胞数量和功能的影响。方法：建立Lewis肺癌细胞与小鼠脾淋巴细胞共培养体系。Lewis肺癌细胞与不同浓度小鼠脾淋巴细胞共培养,分为4组：实验组Ⅰ（5×105个Lewis肺癌细胞与1×106个淋巴细胞共培养）、对照组Ⅰ（1×106个淋巴细胞单独培养）、实验组Ⅱ（5×105个Lewis肺癌细胞
与2×106个淋巴细胞共培养）、对照组Ⅱ（2×106个淋巴细胞单独培养）;Lewis肺癌细胞与
淋巴细胞共培养不同时间,采用3个时间点：24、48和72 h;Lewis肺癌细胞培养上清与淋巴细
胞共培养,选择培养上清浓度为20%和50%。采用流式细胞术检测了Lewis肺癌细胞与脾淋巴
细胞共培养系统中CD4+CD25+Treg细胞数量变化,通过RT-PCR方法检测了共培养对Foxp
3 mRNA表达的影响。结果：与对照组比较,实验组Ⅰ 中CD4+CD25+Treg细胞数量和Foxp3 mRN
A表达明显增强（P<0.05）,实验组Ⅱ中CD4+CD25+Treg细胞数量和Foxp3 mRNA表达无明
显变化（P>0.05）;Lewis肺癌细胞与淋巴细胞培养24及48 h可见CD4+CD25+Treg细胞数量及Foxp3
mRNA表达明显升高（P<0.05）,而72 h后变化不明显;20%和50% Lewis肺癌细胞培养上清
均可明显提高CD4+CD25+Treg数量及Foxp3 mRNA表达（P<0.05）。结论：肿瘤细胞及其培养
上清可诱导CD4+CD25+Treg细胞数量增加、功能增强,由肿瘤细胞所引起的CD4+CD25+Treg细
胞产生及功能增强可能是肿瘤逃避免疫监视机制之一。     

Foxp3+调节性T细胞分化发育及其功能稳定性研究进展

Foxp3+调节性T细胞（Foxp3+Treg）是一类能抑制免疫系统攻击机体自身组织的一类CD4+T细胞亚群,其关键性表型特征在于表达Forkhead家族转录因子Foxp3。Foxp3在CD4+调节性T细胞的分化、发育和功能稳定的过程中发挥着重要功能。Foxp3蛋白水平变化导致的调节性T细胞功能稳定性改变与人类多种重大免疫相关疾病如感染性疾病、自身免疫病、过敏性疾病、肿瘤发生与转移、移植排斥等密切相关。研究Foxp3+调节性T细胞分化发育和功能稳定性的分子机制,将为相关免疫疾病治疗提供新思路新靶点。