寻常型白癜风与晕痣患者外周血T淋巴细胞亚群及Th1/Th2、Th17/Treg细胞平衡比较

目的比较寻常型白癜风与晕痣患者外周血辅助性T细胞1(Th1)、Th2、Th17、调节性T淋巴细胞(Treg细胞)水平,以及Th1与Th2比值(Th1/Th2)、Th17与Treg比值(Th17/Treg)。方法选取43例进展期寻常型白癜风患者和37例Ⅰ、Ⅱ阶段晕痣患者进行研究,均采集外周血进行流式细胞学检测。对照组(n=15)为本院常规体检健康人群。结果寻常型白癜风组病灶多部位者比率显著高于晕痣组多部位者比率(P 0.05)。寻常型白癜风组、晕痣组及对照组Th2、Th17细胞水平及Th17/Treg有显著差异(P 0.05),Th1、Treg细胞及Th1/Th2无显著差异(P 0.05)。结论寻常型白癜风与晕痣患者外周血Th1、Th2、Th17及Treg细胞变化存在差异,表现为寻常型白癜风患者外周血Th17细胞增高更为显著,而晕痣患者外周血Th2细胞下降更显著。     

多发性骨髓瘤患者Treg细胞、Th17细胞及相关转录因子mRNA的表达及临床意义

目的:探讨多发性骨髓瘤(MM)患者外周血及骨髓中调节性T细胞(Treg细胞)和辅助性T细胞17(Thl7细胞)的比率及其相应特异转录因子Foxp3、RORγt的mRNA表达水平,分析Treg/Thl7平衡的临床意义。方法:将46例MM患者分为初发组(n=20)、平台期组(n=16)、复发/难治组(n=10),以健康体检者(n=20)为正常对照组。用流式细胞术检测研究对象外周血及骨髓中Treg细胞、Th17细胞占CD4~+T细胞的比率及Treg/Th17比值的变化;RT-PCR检测转录因子Foxp3及RORγt mRNA的表达水平;同时分析患者血清IL-6及CRP水平变化。结果:初发组及复发/难治组患者外周血和骨髓Treg细胞比率较正常对照组及平台期组患者升高(P0.05);初发组及复发/难治组患者外周血和骨髓中Th17细胞比率与正常对照组及平台期差异均无统计学意义。初发组及复发/难治组患者外周血和骨髓中Treg/Thl7比值高于平台期组及正常对照组(P0.05)。各组外周血及骨髓中Foxp3和RORγt mRNA的变化趋势与Treg/Thl7一致。MM患者血清中IL-6、CRP水平与外周血及骨髓中Treg/Thl7比值变化一致。结论:MM患者活动期外周血及骨髓中Treg/Thl7平衡向Treg倾斜,Foxp3表达水平升高;血清中IL-6、CRP水平与Treg/Th17比值变化趋势一致,可用于预测MM患者预后。     

白癜风患者Th17/Treg、WBC、PLR的表达及临床意义

目的探讨白癜风患者辅助性T细胞17(Th17)/调节性T细胞(Treg)、白细胞计数(WBC)、血小板淋巴细胞比值(PLR)的表达及临床意义。方法选取2017年1月至2020年1月该院收治的127例白癜风患者为研究对象,根据白癜风临床分期标准分为稳定期组(62例)和进展期组(65例);根据白癜风临床分型标准分为节段型组(66例)和寻常型组(61例)。另选择同期127例健康体检者为对照组。比较不同分期组与对照组,不同分型组与对照组的Th17、Treg、Th17/Treg、PLR、白细胞介素(IL)-17、IL-6、WBC水平;分析白癜风患者白癜风病情活动度评分(VIDA评分)与上述各指标水平的相关性。结果与对照组比较,稳定期组及进展期组Th17、Th17/Treg、IL-6、IL-17水平升高(P 0.05),Treg、PLR、WBC水平降低(P 0.05);进展期组Th17、Th17/Treg、IL-6、IL-17水平高于稳定期组(P0.05),Treg、PLR、WBC水平低于稳定期组(P0.05)。与对照组比较,节段型组及寻常型组Th17、Th17/Treg、IL-17、IL-6水平升高(P0.05),Treg、PLR、WBC水平降低(P0.05);寻常型组Th17、Th17/Treg、IL-6、IL-17水平高于节段型组(P0.05),Treg、PLR、WBC水平低于节段型组(P0.05)。白癜风患者VIDA评分与Th17、Th17/Treg、IL-17、IL-6水平呈正相关(P 0.05),与Treg、WBC及PLR水平呈负相关(P0.05)。结论 WBC、PLR、Th17/Treg、IL-6及IL-17水平变化与白癜风的发生、发展密切相关。     

桥本甲状腺炎患者外周血调节性T细胞与Th17细胞的动态变化及其意义

目的研究桥本甲状腺炎患者外周血调节性T细胞(Treg)与Th17细胞的动态变化与意义。方法采用回顾性研究方法,选取2016年8月至2017年4月陕西省安康市人民医院内分泌科收治的桥本甲状腺炎患者40例(观察组)以及同期健康体检者40例(对照组),比较两组外周血单个核细胞(PBMC)中Th7/Treg细胞比值、细胞特异性转录因子Foxp3、RORγt的mRNA表达以及血清中的IL-17A与TGF-β含量。结果观察组患者的TSH、TPO-Ab、Tg Ab明显高于对照组,FT3、FT4明显低于对照组(P0.05);观察组PBMC中的Treg与Th17细胞比率明显低于对照组(P0.05),Th7/Treg细胞比值明显高于对照组(P0.05),Foxp3中mRNA表达水平明显低于对照组(P0.05),RORγt的mRNA表达水平明显高于对照组(P0.05);观察组患者血清IL-17A水平明显高于对照组(P0.05)。结论桥本甲状腺炎患者的Th17/Treg细胞比值会发生明显的改变,可能与甲状腺抗体存在联系,Th17/Treg细胞亚群免疫功能失衡与疾病有密切的关系。     

桥本甲状腺炎患者外周血调节性T细胞/Th17细胞平衡动态变化的研究

目的 探讨桥本甲状腺炎(HT)患者外周血调节性T细胞(Treg)与Th17细胞的动态变化及其意义.方法 流式细胞术检测36例HT患者和30例健康对照者外周血单个核细胞(PBMC)中Treg和Th17细胞的比例,实时定量RT-PCR检测Treg和Th17细胞特异性转录因子Foxp3、RORγt mRNA的表达水平,ELISA检测血清中相关细胞因子TGF-β和IL-17A的含量.结果 HT患者PBMC中Treg细胞比例及Foxp3 mRNA表达水平均明显低于健康对照者(t=-10.62、-7.624,P均<0.01),HT亚组间差异具有统计学意义(F=4.414、4.512,P均<0.05);Th17细胞比例、RORγt mRNA表达水平及Th17/Treg比值均明显高于健康对照者(t=11.32、19.25、8.386,P均<0.01),HT亚组间差异均具有统计学意义(F分别为34.947、14.551、24.338,P均<0.01),亚组间两两比较差异均有统计学意义(P均<0.05).HT患者血清TGF-β的含量较健康对照者略低,但差异无统计学意义(P>0.05);IL-17A的含量均较健康对照者显著升高(P<0.01),HT患者组内各亚组间血清IL-17A的含量差异具有统计学意义(F=11.077,P<0.01),两两比较差异亦具有统计学意义(P均<0.05).HT患者Th17/Treg比值与血清甲状腺过氧化物酶抗体(TPOAb)、甲状腺球蛋白抗体(TgAb)滴度均呈显著正相关(r=0.349、0.502,P=0.037、0.002).结论 在HT发病过程中,Th17/Treg细胞轴呈动态改变,并且与甲状腺自身抗体滴度正相关,说明Th17/Treg细胞亚群的免疫失平衡可能参与了HT的发生发展.     

Tim-3在多发性骨髓瘤患者Th17/Treg细胞失衡中的意义

目的:探讨Tim-3在多发性骨髓瘤(MM)患者Th17/Treg失衡中的意义。方法:选取56例初诊MM患者及30例健康者,采用流式细胞术检测两组外周血CD4^+T细胞上Tim-3的表达、Th17和Treg细胞各占比例、Th17/Treg比值、Tim-3在Th17及Treg细胞上的表达、Tim-3^+Th17/Tim-3^+Treg比值。运用ELISA技术检测细胞因子IL-17和IL-10的水平。分析Tim-3^+Th17/Tim-3^+Treg平衡与临床指标的关系。结果:与对照组相比,MM患者外周血CD4^+T细胞上Tim-3表达明显增高(P<0.05)。MM患者组Th17细胞比例、Th17/Treg比值较对照组明显增高(P<0.05),MM患者Treg细胞比例较对照组低,差异无统计学意义(P>0.05)。MM患者组细胞因子IL-17、IL-10及IL-17/IL-10比值均较对照组明显增高(P<0.05)。MM患者组Tim-3^+Th17细胞水平及Tim-3^+Th17/Tim-3^+Treg比例较对照组明显增高(P<0.05),MM患者Tim-3^+Treg细胞水平较对照组低,差异有统计学意义(P<0.05)。MM患者Tim-3^+Th17/Tim-3^+Treg比值与ISS分期、DS分期、染色体异常及sFLCR呈正相关(r=0.635、r=0.501、r=0.449、r=0.587)。结论:MM患者体内存在Th17/Treg、IL-17/IL-10及Tim-3^+Th17/Tim-3^+Treg比值增高,其中Tim-3^+Th17/Tim-3^+Treg比值与患者ISS分期、DS分期、染色体异常及sFLCR有关,提示Tim-3参与了MM患者Th17/Treg失衡。     

非酒精性脂肪性肝病患者病情进展与T细胞水平的相关性研究

目的探讨非酒精性脂肪性肝病(NAFLD)患者病情进展与辅助性T细胞17(Th17)、调节性T细胞(Treg)水平的相关性。方法选取非酒精性脂肪性肝炎(NASH)患者、非酒精性脂肪肝(NAFL)患者以及健康对照者各25例,比较3组肝脏病变程度相关指标[丙氨酸转氨酶(ALT)、天门冬氨酸转氨酶(AST)、总胆红素(TBil)、直接胆红素(DBil)]、肝纤维化4项[Ⅲ型前胶原(PCⅢ)、Ⅳ型胶原(Ⅳ-C)、层黏连蛋白(LN)、透明质酸酶(HA)],分析外周血Th17、Treg及相关炎症因子[白细胞介素-10(IL-10)、白细胞介素-17(IL-17)]与肝脏病变程度相关性。结果 3组患者年龄、性别分布、吸烟史、高血压病、肝硬化家族史比较差异无统计学意义(P 0.05);对照组合并糖尿病者7例,显著少于NAFL组18例和NASH组19例(P 0.05)。3组外周血Th17、Treg、IL-10、IL-17水平两两比较,差异均有统计学意义(P 0.05)。NASH组ALT、AST水平显著高于其他2组(P 0.05); NAFL组ALT水平显著低于对照组(P 0.05),AST水平显著高于对照组(P 0.05)。NASH组TBil、DBil水平与NAFL组、对照组比较均差异有统计学意义(P 0.05)。NASH组PCⅢ、Ⅳ-C、LN、HA水平以及Fibro-touch评分均显著高于其他2组(P 0.05),且NAFL组HA水平显著高于对照组(P 0.05)。相关性分析结果显示,Th17、IL-17与ALT、AST、TBil、DBil、PCⅢ、Ⅳ-C、LN、HA、Fibro-touch评分、病情程度呈显著正相关(P 0.001),Treg、IL-10与ALT、AST、TBil、DBil、PCⅢ、Ⅳ-C、LN、HA、Fibro-touch评分、病情程度呈显著负相关(P 0.001)。结论 NAFLD患者外周血中Th17/Treg比例失衡,Th17、Treg表达水平与病情严重程度高度相关,可作为评估NAFLD病情进展的有效指标。     

银屑病患者 Th17和 Treg细胞及其相关细胞因子的表达

目的：探讨银屑病患者辅助性T细胞17（Th17）和调节性T （Treg）细胞及其相关因子表达的临床意义。方法用流式细胞术检测28例轻度和25例重度银屑病患者及25名健康对照者外周血中Th17和Treg细胞的比例;用逆转录聚合酶链反应（PCR）检测维甲酸相关孤儿受体γt（RORγt）和抗人叉头状转录因子（Foxp3） mRNA的表达;用酶联免疫吸附试验（ ELISA）检测血浆Th17和Treg相关细胞因子白细胞介素17（ IL-17）和转化生长因子β（ TGF-β）的水平。结果与健康对照组比较,银屑病患者组Th17细胞比例、RORγt的mRNA水平及IL-17的浓度显著上升,且重度组显著高于轻度组（P＜0．05）;而重度银屑病患者Treg细胞、Foxp3 mRNA和血浆TGF-β浓度均较健康对照组和轻度组显著降低（ P＜0．05）。结论 Th17和Treg细胞的比例及其相关因子的表达可作为银屑病病情进展的标志。     

老年带状疱疹后神经痛病人外周血Th17/Treg细胞及相关细胞因子的表达

目的:探讨老年带状疱疹后神经痛(postherpetic neuralgia, PHN)病人外周血中Th17、Treg细胞及相关细胞因子的表达及其临床意义。方法:采用流式细胞术检测60例老年带状疱疹后神经痛病人及30例健康对照者外周血中Th17、Treg细胞水平,并计算Th17/Treg比率,ELISA方法检测外周血中白介素-6 (Interleukin-6, IL-6)、白介素-10 (Interleukin-10, IL-10)、白介素-17 (Interleukin-17,IL-17)及人肿瘤坏死因子-α(TNF-α)的表达水平。结果:与对照组相比,病例组病人外周血Th17的含量及IL-6、IL-17表达水平显著降低(P <0.05);Treg细胞含量及IL-10、TNF-α表达水平显著升高(P <0.05),且Th17/Treg比率较对照组降低,差异具有统计学意义(P <0.05)。结论:Th17细胞在PHN外周血中显著降低,Treg细胞显著增高,与二者相关的细胞因子也相应变化,Th17/Treg比率显著降低,提示两者通过多种机制参与机体的免疫应答,Th17/Treg的失衡可能在老年PHN的发病机制中起重要作用。     

尖锐湿疣患者人乳头瘤病毒感染与调节性T淋巴细胞和辅助性T细胞17的关系

目的探讨尖锐湿疣（CA）患者人乳头瘤病毒（HPV）亚型及HPVDNA载量与调节性T淋巴细胞（Treg）和辅助性T细胞17（Th17）的关系。方法CA患者80例为CA组和健康者40例为正常对照组,检测外周血Treg、Th17细胞比例,Foxp3mRNA、ROR-γmRNA表达量及HPV亚型和HPVDNA载量。结果CA组和正常对照组及初发组和复发组外周血Treg、Th17细胞比例和Treg／Th17、Foxp3mRNA及ROR-γt mRNA表达量差异均有统计学意义（P〈0．05）,外周血Foxp3mRNA与ROR-γt mRNA表达量呈负相关（P〈0．05）。不同HPV亚型组和不同HPVDNA载量组外周血Treg细胞比例、Th17细胞比例、Treg／Th17、Foxp3mRNA及ROR-γt mRNA表达量差异均有统计学意义（P〈0．05）。外周血HPVDNA载量分别与Treg、Treg／Th17呈正相关（P〈0．05）,与Th17呈负相关（P〈0．05）。结论CA患者HPV感染可诱导Treg细胞活化增殖,Treg／Th17失衡抑制机体抗病毒免疫应答可能在尖锐湿疣发病和复发中起重要作用。     

T cell proliferation induced by anti-self-I-A-specific T cell hybridomas. Evidence of a T cell network

Allo-I-A-reactive T cell hybridomas were generated from MLR-activated lymphoblasts. Cloned hybridomas T1.203, T1.321, and T1.426 were stimulated by I-Ab determinants, as shown by their ability to secrete IL-2 in response to a panel of MHC-recombinant mice. T2.146, T2.205, and T3.116 were found to be specific for I-Ak determinants using a similar panel of MHC-recombinant mice. Inhibition of IL-2 secretion by anti-I-A mAb confirmed these data. Some I-Ab-specific hybrids stimulated the proliferation of T cells from C57BL/6 (H-2b) mice. Similarly, some I-Ak-specific hybrids stimulated the proliferation of T cells from C3H/HeJ (H-2k) mice. These hybrids expressed no detectable surface I-A, and stimulation of T cells was not inhibited by anti-I-A mAb. These results are consistent with the hypothesis that normal mice possess a population of T cells responsive to idiotypic determinants on anti-MHC class II T cell receptors.     

T regulatory cell chemokine production mediates pathogenic T cell attraction and suppression

T regulatory cells (Tregs) control immune homeostasis by preventing inappropriate responses to self and nonharmful foreign antigens. Tregs use multiple mechanisms to control immune responses, all of which require these cells to be near their targets of suppression; however, it is not known how Treg-to-target proximity is controlled. Here, we found that Tregs attract CD4⁺ and CD8⁺ T cells by producing chemokines. Specifically, Tregs produced both CCL3 and CCL4 in response to stimulation, and production of these chemokines was critical for migration of target T cells, as Tregs from Ccl3^–/– mice, which are also deficient for CCL4 production, did not promote migration. Moreover, CCR5 expression by target T cells was required for migration of these cells to supernatants conditioned by Tregs. Tregs deficient for expression of CCL3 and CCL4 were impaired in their ability to suppress experimental autoimmune encephalomyelitis or islet allograft rejection in murine models. Moreover, Tregs from subjects with established type 1 diabetes were impaired in their ability to produce CCL3 and CCL4. Together, these results demonstrate a previously unappreciated facet of Treg function and suggest that chemokine secretion by Tregs is a fundamental aspect of their therapeutic effect in autoimmunity and transplantation.     

成熟T细胞肿瘤与T细胞反应性增生抗原表达对比研究

目的 比较成熟T细胞肿瘤与T细胞反应性增生白细胞共同抗原CD45、全T细胞抗原CD2、CD3、CD5、CD7及CD4、CD8等的表达差异,探讨上述抗原表达变化在成熟T细胞肿瘤诊断中的价值.方法 对36例成熟T细胞肿瘤及36例T细胞反应性增生流式细胞免疫分型资料进行回顾性分析.根据抗原表达及其与正常T细胞的比较,将T细胞抗原表达模式分为抗原丢失及抗原强度变化.强度变化包括表达减弱、表达增强、双峰表达、表达不均匀等.结果 63.9%的成熟T细胞肿瘤有1项或多项全T细胞抗原丢失(23/36),明显高于对照组的8.3%(3/36),两者差异具有显著性(χ2=21.772,P<0.0001).36.1%的成熟T细胞肿瘤病例有3项或4项全T抗原强度变化(13/36),明显高于对照组的8.3%(3/36).两者差异具有显著性(χ2=6.525,P=0.0106).97.2%的成熟T细胞肿瘤CD4/CD8比例异常(35/36),明显高于对照组的22.2%(8/36),两者差异具有显著性(χ2=39.024,P<0.0001).27.8%的成熟T细胞肿瘤CD45表达异常(10/36),明显高于对照组的2.8%(1/36),两者差异具有显著性(χ2=6.859,P<0.0088).结论 成熟T细胞肿瘤与T细胞反应性增生在全T细胞抗原、CD4、CD8及CD45表达方面具有明显不同的特点,上述抗体的检测有助于成熟T细胞肿瘤的诊断及鉴别诊断.     

Human cutaneous T cell lymphoma and leukemia cell lines produce and respond to T cell growth factor

Three cell lines of mature T cell origin derived from patients with cutaneous T cell lymphoma-leukemias (CTCL) were found to be constitutive producers of T cell growth factor (L-TCGF). These are the first reported human cell lines which constitutively produce TCGF. Biologically active TCGF could also be eluted from the surface of these cells using an acid glycine buffer under conditions that maintained cell viability, and subcellular fractionation showed that almost all the TCGF activity was associated with the plasma membrane. Over 30 other human hematopoietic cell lines derived from other disorders were unable to produce TCGF even after induction, and their acid eluates did not contain TCGF activity. L-TCGF from CTCL lines had the same biological activity as TCGF obtained from normal leukocytes (N-TCGF) in that they both supported the long-term growth of normal T cells only after the cells were previously activated by antigen or lectin. Both L-TCGF and N-TCGF increased the rate of proliferation of TCGF-independent and TCGF-dependent CTCL cell lines. The same three factor-independent cell lines that released TCGF adsorbed TCGF in a cell-concentration, time-, and temperature-dependent manner. Since the CTCL cell lines produce TCGF, adsorb TCGF, and increase their proliferative rate in response to TCGF or a related molecule, it is suggested that this endogenously produced factor plays a role in maintaining the abnormal proliferation of these cells in culture as permanently growing cell lines independent of exogenous TCGF. However, this does not mean that this is an essential aspect of neoplastic transformation. Since it is unusual to develop these cell lines in the absence of the continuous need for added TCGF, “autostimulation” may be one of the many unusual variant phenotypic properties sometimes associated with neoplastic cells that gives them a selective advantage for in vitro growth.     

Protease inhibitors selectively block T cell receptor-triggered programmed cell death in a murine T cell hybridoma and activated peripheral T cells

The hypothesis that cytoplasmic proteases play a functional role in programmed cell death was tested by examining the effect of protease inhibitors on the T cell receptor-mediated death of the 2B4 murine T cell hybridoma and activated T cells. The cysteine protease inhibitors trans-epoxysuccininyl-L-leucylamido-(4-guanidino) butane (E-64) and leupeptin, the calpain selective inhibitor acetyl-leucyl-leucyl- normethional, and the serine protease inhibitors diisopropyl fluorophosphate and phenylmethylsulfonyl fluoride, all showed dose- dependent blocking of the 2B4 death response triggered by the T cell receptor complex and by anti-Thy-1. These protease inhibitors enhanced rather than inhibited IL-2 secretion triggered by T cell receptor cross- linking, showing that they did not act by preventing signal transduction. Growth inhibition induced by cross-linking the 2B4 T cell receptor, measured by inhibition of thymidine incorporation, was not generally blocked by these protease inhibitors. All five of these protease inhibitors enhanced rather than blocked 2B4 cell death triggered by dexamethasone, an agent previously shown to have a death pathway antagonistic with that of the TCR. 2B4 cytolysis by the cytotoxic agents staphylococcal alpha-toxin and dodecyl imidazole, and that caused by hypotonic conditions, was not significantly affected by the five protease inhibitors tested. The selected protease inhibitors blocked both the apoptotic nuclear morphology changes and DNA fragmentation induced by T cell receptor cross-linking, and enhanced both these properties induced by dexamethasone in 2B4 cells. The T cell receptor-induced death of activated murine lymph node T cells and human peripheral blood CD4+ T cells was blocked by both cysteine and serine protease inhibitors, showing that the protease-dependent death pathway also operates in these systems.     

T cell receptor alpha-, beta-, and gamma-genes in T cell and pre-B cell acute lymphoblastic leukemia

We examined alpha-, beta-, and gamma-T cell receptor (TCR) gene activation within acute lymphoblastic leukemias (ALLs) that represent early stages of B and T cell development. We wished to determine if TCR rearrangement and expression was lineage restricted, showed any developmental hierarchy, or could identify new subsets of T cells. Rearrangement of gamma and beta TCR genes occurred early in development but in no set order, and most T-ALLs (22/26) were of sufficient maturity to have rearranged both genes. T-ALLs preferentially rearranged C gamma 2 versus the C gamma 1 complex; no preference within the beta locus was apparent. Once rearranged, the beta TCR continued to be expressed (11/13), whereas the gamma TCR was rarely expressed (3/14). The alpha TCR was expressed only in more mature T-ALLs (8/14) that usually displayed T3. The 3A-1 T cell associated antigen appeared earliest in development followed by T11 and T3. Within pre-B cell ALL a higher incidence of lineage spillover was noted for gamma TCR rearrangements (8/17) than for beta rearrangements (3/17). This also contrasts with the only occasional rearrangement of immunoglobulin (Ig) heavy chains (3/25) in T-ALL. However, in pre-B ALL the pattern of gamma TCR usage was distinct from that of T cells, with the C gamma 1 complex utilized more frequently. Almost all ALLs could be classified as pre-B or T cell in type by combining Ig and TCR genes with monoclonal antibodies recognizing surface antigens, although examples of lineage duality were noted. Unique subpopulations of cells were discovered including two genetically uncommitted ALLs that failed to rearrange either Ig or TCR loci. Moreover, two T lymphoblasts were identified that possessed the T3 molecule but failed to express alpha plus beta TCR genes. These T-ALLs may represent a fortuitous transformation of T cell subsets with alternative T3-Ti complexes.     

人白血病细胞株重组激活基因表达及T细胞受体基因重排的检测

背景：淋巴细胞特异性重组激活基因编码的重组激活基因1与重组激活基因2蛋白是参与V（D）J重排机制的重要的重组酶。除参与V（D）J重排以外，近年的研究结果表明重组激活基因介导的转位作用可能与染色体易位及淋巴性恶性肿瘤的发生有关，但迄今尚未有明确定论。目的：检测重组激活基因、DNA修复因子Ku70／Ku80和末端脱氧核苷转移酶mRNA表达以及T细胞受体基因重排在人白血病和淋巴癌细胞株的发生情况。设计：重复测量实验。单位：南方医科大学生物技术学院分子免疫研究所。材料：T淋巴白血病细胞株Jurkat和6T-CEM购自上海细胞生物研究所；T淋巴白血病细胞株Molt-4，皮肤T细胞淋巴癌细胞株HuT102，Burkitt’s淋巴癌细胞株Raji和Daudi以及原髓细胞白血病细胞株HL-60和慢性髓原白血病细胞株K562均由本实验室保存。细胞用含有体积分数0．1胎牛血清的RPMI1640培养基于37℃，体积分数0．05C02条件下培养。方法：实验于2005-10／2006-01在南方医科大学生物技术学院分子免疫研究所完成。采用反转录聚合酶链反应检测重组激活基因1，重组激活基因2，非同源末端连接装置途径中的DNA修复因子Ku70／Ku80。以及末端脱氧核苷转移酶mRNA表达；采用巢式、半巢式聚合酶链反应、连接介导的聚合酶链反应等方法检测T细胞受体重排删除DNA环和T细胞受体B链重组信号序列两端的断裂点。了解参与V（D）J重排过程的基因表达和T细胞受体基因重排中间体的产生情况。主耍观察指标：重组激活基因、DNA修复因子Ku70／Ku80和末端脱氧核苷转移酶mRNA表达以及T细胞受体基因重排在人白血病和淋巴癌细胞株的发生情况。结果：反转录聚合酶链反应检测结果显示：重组激活基因1mRNA在4种T细胞株中均被检测到，在两种B细胞株和两种髓性白血病细胞株中未检测到；重组激活基因2和末端脱氧核苷转移酶mRNA表达仅在Jurkat，Molt-4和6T-CEM3种T细胞株中检测到，但在6T-CEM表达较弱；除HL-60细胞未检测到Ku80表达外，所有细胞株均检测到Ku70和Ku80表达。对4种T细胞株T细胞受体重排中间体检测结果表明：仅在Jurkat细胞中检测到DB2-J132 sjTRECs与DB25’端和3’Rss断点，表明Jurkat细胞发生T细胞受体基因重排。同时发现Jurkat TCR Dβ2-Jβ2重排删除环结合区具有明显的多样性特征。结论：重组激活基因可能与T细胞白血病具有更为密切的关系。Jurkat细胞有可能成为研究重组激活基因与T细胞淋巴性肿瘤的一个潜在的细胞模型。     

T cell receptor gene recombination patterns and mechanisms: cell death, rescue, and T cell production

The antigen-specific receptors of T and B lymphocytes are generated by somatic recombination between noncontiguous gene segments encoding the variable portions of these molecules. The semirandom nature of this process, while desirable for the generation of diversity, has been thought to exact a high price in terms of sterile (out-of-frame) products. Historically, the majority of T lymphocytes generated in mammals were thought to be useless, either because they generated such sterile rearrangements or because the receptors generated did not appropriately recognize self-molecules (i.e., positive and negative selection). In the studies described here, we characterize the onset of T cell receptor (TCR) alpha and beta chain gene rearrangements and quantitate their progression throughout T cell development. The results show that T cell production efficiency is enhanced through (a) rearrangement of TCR-beta chain genes early during T cell development, with selective expansion of those cells possessing in-frame rearrangements; (b) deletion of sterile rearrangements at the TCR-alpha chain locus through ordered (proximal to distal) sequential recombination; and (c) modification of nonselectable alpha/beta heterodimer specificities through generation and expression of new TCR- alpha chains. In addition, we demonstrate strict correlations between successful TCR-beta gene rearrangement, the onset of TCR-alpha gene rearrangement, rapid cell division, and programmed cell death, which together serve to maintain cell turnover and homeostasis during T cell development.     

Alterations in cytotoxic and helper T cell function after infection of T cell clones with human T cell leukemia virus, type I

HTLV-I is a transforming human retrovirus that is an etiologic agent of adult T cell leukemia/lymphoma. To investigate the effects of this virus on T cell functions, two OKT3+, OKT4+, OKT8- cytotoxic clones (8.7 and 8.8) specific for allogeneic cells bearing DPw2, a class II histocompatibility antigen, were studied before and after infection with HTLV-I. The clones retained cytotoxic function for up to 70 d after exposure to HTLV-I, even without subsequent antigenic stimulation, but then lost their cytotoxic activity. Prior to infection with HTLV-I, clone 8.8 also lysed OKT3 hybridoma cells; after infection, cytotoxic activity against these OKT3-antibody bearing cells was lost in parallel with the loss of activity against DPw2-bearing target cells. In addition, expression of T3 surface antigen by HTLV-I-infected 8.8 cells was decreased at a time when they lost their cytotoxic activity, possibly contributing to the loss of cytotoxic function. Finally, clone 8.8 could provide help for nonspecific IgG production by autologous B cells when stimulated with irradiated DPw2-bearing non-T cells. After infection with HTLV-I, this helper function became independent of DPw2-stimulation and persisted even when the cytotoxic activity was lost. An OKT4+ T cell clone thus could simultaneously manifest both cytotoxic and helper T cell activities, and these activities were differentially affected after HTLV-I infection.     

人白血病细胞株重组激活基因表达及T细胞受体基因重排的检测

背景:淋巴细胞特异性重组激活基因编码的重组激活基因1与重组激活基因2蛋白是参与V(D)J重排机制的重要的重组酶。除参与V(D)J重排以外,近年的研究结果表明重组激活基因介导的转位作用可能与染色体易位及淋巴性恶性肿瘤的发生有关,但迄今尚未有明确定论。目的:检测重组激活基因、DNA修复因子Ku70/Ku80和末端脱氧核苷转移酶mRNA表达以及T细胞受体基因重排在人白血病和淋巴瘤细胞株的发生情况。设计:重复测量实验。单位:南方医科大学生物技术学院分子免疫研究所。材料:T淋巴白血病细胞株Jurkat和6T-CEM购自上海细胞生物研究所;T淋巴白血病细胞株Molt-4,皮肤T细胞淋巴瘤细胞株HuT102,Burkitt’s淋巴瘤细胞株Raji和Daudi以及原髓细胞白血病细胞株HL-60和慢性髓原白血病细胞株K562均由本实验室保存。细胞用含有体积分数0.1胎牛血清的RPMI1640培养基于37℃,体积分数0.05CO2条件下培养。方法:实验于2005-10/2006-01在南方医科大学生物技术学院分子免疫研究所完成。采用反转录聚合酶链反应检测重组激活基因1,重组激活基因2,非同源末端连接装置途径中的DNA修复因子Ku70/Ku80,以及末端脱氧核苷转移酶mRNA表达;采用巢式、半巢式聚合酶链反应、连接介导的聚合酶链反应等方法检测T细胞受体重排删除DNA环和T细胞受体β链重组信号序列两端的断裂点。了解参与V(D)J重排过程的基因表达和T细胞受体基因重排中间体的产生情况。主要观察指标:重组激活基因、DNA修复因子Ku70/Ku80和末端脱氧核苷转移酶mRNA表达以及T细胞受体基因重排在人白血病和淋巴瘤细胞株的发生情况。结果:反转录聚合酶链反应检测结果显示:重组激活基因1mRNA在4种T细胞株中均被检测到,在两种B细胞株和两种髓性白血病细胞株中未检测到;重组激活基因2和末端脱氧核苷转移酶mRNA表达仅在Jurkat,Molt-4和6T-CEM3种T细胞株中检测到,但在6T-CEM表达较弱;除HL-60细胞未检测到Ku80表达外,所有细胞株均检测到Ku70和Ku80表达。对4种T细胞株T细胞受体重排中间体检测结果表明:仅在Jurkat细胞中检测到Dβ2-Jβ2sjTRECs与Dβ25’端和3’RSS断点,表明Jurkat细胞发生T细胞受体基因重排。同时发现JurkatTCRDβ2-Jβ2重排删除环结合区具有明显的多样性特征。结论:重组激活基因可能与T细胞白血病具有更为密切的关系。Jurkat细胞有可能成为研究重组激活基因与T细胞淋巴性肿瘤的一个潜在的细胞模型。