目的探讨不同病因所致肝衰竭患者外周血单个核细胞(PBMCs)HLA-DR m RNA及Th17和CD4^+CD25^+Treg细胞水平的变化及其意义。方法本研究纳入肝衰竭患者50例,其中乙型肝炎肝衰竭15例,药物性肝损伤12例,酒精性肝病13例,自身免疫性肝炎10例;...目的探讨不同病因所致肝衰竭患者外周血单个核细胞(PBMCs)HLA-DR m RNA及Th17和CD4^+CD25^+Treg细胞水平的变化及其意义。方法本研究纳入肝衰竭患者50例,其中乙型肝炎肝衰竭15例,药物性肝损伤12例,酒精性肝病13例,自身免疫性肝炎10例;慢性乙型肝炎患者17例和正常人10例。采用PCR法检测PBMCs中HLA-DR m RNA水平,使用流式细胞仪检测CD4^+CD25^+Treg和Th17细胞百分比。结果乙型肝炎肝衰竭患者HLA-DR m RNA水平为(134.5±15.2),显著高于药物性肝损伤组的(17.9±1.2)、酒精性肝病组的(19.6±2.0)和自身免疫性肝炎组的[(11.2±1.2),P<0.05];不同病因肝衰竭患者Th17和CD4^+CD25^+Treg细胞百分比[分别为(4.4±0.6)%和(3.9±0.6)%左右]的差异无统计学意义(P>0.05),但与慢性乙型肝炎[分别为(3.7±0.2)%和(6.1±0.4)%和正常人(2.1±0.7)%和(7.0±0.9)%比,均有显著性差异(P<0.05);对不同病因肝衰竭患者进行动态观察发现,19例死亡患者CD4^+CD25^+Treg细胞百分比呈持续下降,直至死亡,而31例生存患者则逐渐恢复至接近正常水平。结论外周血单个核细胞HLA-DR m RNA水平及Th17和CD4^+CD25^+Treg细胞百分比的变化与肝衰竭患者的病情密切相关,可作为判断肝衰竭严重程度及预后的指标。展开更多
目的:探讨慢性乙型肝炎(乙肝)患者外周血CD4^(+)Th细胞内赖氨酸特异性组蛋白去甲基化酶1(histone lysine specific demethylase 1,LSD1)表达水平与Th1/Th2平衡的关系,初步探讨LSD1介导的组蛋白修饰对慢性乙肝患者CD4^(+)Th细胞分化的作...目的:探讨慢性乙型肝炎(乙肝)患者外周血CD4^(+)Th细胞内赖氨酸特异性组蛋白去甲基化酶1(histone lysine specific demethylase 1,LSD1)表达水平与Th1/Th2平衡的关系,初步探讨LSD1介导的组蛋白修饰对慢性乙肝患者CD4^(+)Th细胞分化的作用。方法:选择2017年6月至12月在南通大学附属医院感染科住院的慢性乙肝患者65例,分为丙氨酸转氨酶(ALT)高水平[>4×ULN(正常上限)]组与低水平(≤4×ULN)组,HBV-DNA高载量(≥10^(6)拷贝/mL)组与低载量(<106拷贝/mL)组。以同期在该院体检的30例健康人为对照。采用密度梯度离心法分离外周血单个核细胞,免疫磁珠法分选CD4^(+)Th细胞;提取CD4^(+)Th细胞总蛋白,以Western印迹法检测LSD1表达水平。采用ELISA法检测血清中干扰素γ(IFN-γ)、白细胞介素4(IL-4)含量;用微粒子化学发光法检测血清乙型肝炎表面抗原(HBsAg)含量;用实时定量PCR法检测血清HBV-DNA载量。结果:慢性乙肝组患者外周血CD4^(+)Th细胞中LSD1表达水平高于健康人(0.52±0.21 vs 0.28±0.09,t=-7.49,P<0.001)。慢性乙肝患者中,CD4^(+)Th细胞中LSD1表达量在ALT高水平组(n=38)低于低水平组(n=27,0.39±0.18 vs 0.64±0.16;t=-5.79,P<0.001),在HBV-DNA高载量组(n=32)高于HBV-DNA低载量组(n=33,0.69±0.08 vs 0.35±0.16;t=10.80,P<0.001)。与健康人相比,慢性乙肝组血清IFN-γ含量降低、IL-4含量增高、IFN-γ/IL-4比值减小(P<0.05)。慢性乙肝患者外周血CD4^(+)Th细胞中LSD1表达量与其血清ALT水平(r=-0.590)、IFN-γ水平(r=-0.379)及IFN-γ/IL-4(-0.285)负相关(P<0.01),与HBV-DNA载量正相关(r=0.880,P<0.001),与血清IL-4水平无相关性(r=0.169,P=0.102)。结论:LSD1高表达可能是慢性乙肝患者体内Th1/Th2失衡、Th1反应水平下降的原因之一,并导致机体清除HBV能力减弱或抑制HBV复制能力减弱。展开更多
目的:探讨用Th/Tr淋巴细胞比值评估乳腺癌患者的抗肿瘤免疫状态。方法:采用流式细胞术检测53例不同分期的乳腺癌患者化疗前外周血中CD4+Th细胞、CD4+CD25+Tr细胞水平,计算Th/Tr比值,并与30例健康志愿者进行比较。结果:有转移与无转移的...目的:探讨用Th/Tr淋巴细胞比值评估乳腺癌患者的抗肿瘤免疫状态。方法:采用流式细胞术检测53例不同分期的乳腺癌患者化疗前外周血中CD4+Th细胞、CD4+CD25+Tr细胞水平,计算Th/Tr比值,并与30例健康志愿者进行比较。结果:有转移与无转移的乳腺癌患者Tr细胞绝对值差异无统计学意义(103±75vs 109±70,P=0.722)。有转移的乳腺癌患者Th/Tr淋巴细胞比值小于无转移者(3.83±1.37 vs 6.11±2.93,P<0.001),无转移患者小于健康志愿者(6.11±2.93 vs 11.24±1.84,P<0.001)。结论:Th/Tr比值对乳腺癌患者抗肿瘤免疫状态的评估优于Tr细胞计数,Th/Tr比值在乳腺癌患者尤其是有转移的乳腺癌患者中显著降低,其水平变化可作为评估乳腺癌患者免疫状态的有效指标。展开更多
CD4+ helper T (Th) cells play pivotal roles in induction of CD8+ CTL immunity. However, the mechanism of CD4+ T cell help delivery to CD8+ T cells in vivo is still elusive. In this study, we used ovalbumin (OVA...CD4+ helper T (Th) cells play pivotal roles in induction of CD8+ CTL immunity. However, the mechanism of CD4+ T cell help delivery to CD8+ T cells in vivo is still elusive. In this study, we used ovalbumin (OVA)-pulsed dendritic cells (DCovA) to activate OT-II mouse CD4+ T cells, and then studied the help effect of these CD4+ T cells on CD8+ cytotoxic T lymphocyte (CTL) responses+ We also examined CTL mediated islet β cell destruction which leaded to diabetes in wild-type C57BL/6 mice and transgenic rat insulin promoter (RIP)-mOVA mice expressing β cell antigen OVA with self OVA-specific tolerance, respectively. In adoptive transfer experiments, we demonstrated that help, in the form of peptide/major histocompatibility complex (pMHC) I acquired from DCovA by DCovA activation, was required for induction of OVA-specific CTL responses in C57BL/6 mice. However, in combination + + + with TCR transgenlc OT-I mouse CD8 T ceils, the tolerogenic dosage of CD4+ Th cells with acquired pMHC I, but not CD4+ (Kb-/-) Th cells without acquired pMHC I were able to cause diabetes in 8/10 (80%) RIP-mOVA mice. This study thus expands the current knowledge in T cell-mediated autoimmunity and provides insight into the nature of CD4+ T cell-mediated help in CD8+ CTL induction. Cellular & Molecular Immunology. 2008;5(6):407-415.展开更多
文摘目的探讨不同病因所致肝衰竭患者外周血单个核细胞(PBMCs)HLA-DR m RNA及Th17和CD4^+CD25^+Treg细胞水平的变化及其意义。方法本研究纳入肝衰竭患者50例,其中乙型肝炎肝衰竭15例,药物性肝损伤12例,酒精性肝病13例,自身免疫性肝炎10例;慢性乙型肝炎患者17例和正常人10例。采用PCR法检测PBMCs中HLA-DR m RNA水平,使用流式细胞仪检测CD4^+CD25^+Treg和Th17细胞百分比。结果乙型肝炎肝衰竭患者HLA-DR m RNA水平为(134.5±15.2),显著高于药物性肝损伤组的(17.9±1.2)、酒精性肝病组的(19.6±2.0)和自身免疫性肝炎组的[(11.2±1.2),P<0.05];不同病因肝衰竭患者Th17和CD4^+CD25^+Treg细胞百分比[分别为(4.4±0.6)%和(3.9±0.6)%左右]的差异无统计学意义(P>0.05),但与慢性乙型肝炎[分别为(3.7±0.2)%和(6.1±0.4)%和正常人(2.1±0.7)%和(7.0±0.9)%比,均有显著性差异(P<0.05);对不同病因肝衰竭患者进行动态观察发现,19例死亡患者CD4^+CD25^+Treg细胞百分比呈持续下降,直至死亡,而31例生存患者则逐渐恢复至接近正常水平。结论外周血单个核细胞HLA-DR m RNA水平及Th17和CD4^+CD25^+Treg细胞百分比的变化与肝衰竭患者的病情密切相关,可作为判断肝衰竭严重程度及预后的指标。
文摘目的:探讨慢性乙型肝炎(乙肝)患者外周血CD4^(+)Th细胞内赖氨酸特异性组蛋白去甲基化酶1(histone lysine specific demethylase 1,LSD1)表达水平与Th1/Th2平衡的关系,初步探讨LSD1介导的组蛋白修饰对慢性乙肝患者CD4^(+)Th细胞分化的作用。方法:选择2017年6月至12月在南通大学附属医院感染科住院的慢性乙肝患者65例,分为丙氨酸转氨酶(ALT)高水平[>4×ULN(正常上限)]组与低水平(≤4×ULN)组,HBV-DNA高载量(≥10^(6)拷贝/mL)组与低载量(<106拷贝/mL)组。以同期在该院体检的30例健康人为对照。采用密度梯度离心法分离外周血单个核细胞,免疫磁珠法分选CD4^(+)Th细胞;提取CD4^(+)Th细胞总蛋白,以Western印迹法检测LSD1表达水平。采用ELISA法检测血清中干扰素γ(IFN-γ)、白细胞介素4(IL-4)含量;用微粒子化学发光法检测血清乙型肝炎表面抗原(HBsAg)含量;用实时定量PCR法检测血清HBV-DNA载量。结果:慢性乙肝组患者外周血CD4^(+)Th细胞中LSD1表达水平高于健康人(0.52±0.21 vs 0.28±0.09,t=-7.49,P<0.001)。慢性乙肝患者中,CD4^(+)Th细胞中LSD1表达量在ALT高水平组(n=38)低于低水平组(n=27,0.39±0.18 vs 0.64±0.16;t=-5.79,P<0.001),在HBV-DNA高载量组(n=32)高于HBV-DNA低载量组(n=33,0.69±0.08 vs 0.35±0.16;t=10.80,P<0.001)。与健康人相比,慢性乙肝组血清IFN-γ含量降低、IL-4含量增高、IFN-γ/IL-4比值减小(P<0.05)。慢性乙肝患者外周血CD4^(+)Th细胞中LSD1表达量与其血清ALT水平(r=-0.590)、IFN-γ水平(r=-0.379)及IFN-γ/IL-4(-0.285)负相关(P<0.01),与HBV-DNA载量正相关(r=0.880,P<0.001),与血清IL-4水平无相关性(r=0.169,P=0.102)。结论:LSD1高表达可能是慢性乙肝患者体内Th1/Th2失衡、Th1反应水平下降的原因之一,并导致机体清除HBV能力减弱或抑制HBV复制能力减弱。
文摘目的:探讨用Th/Tr淋巴细胞比值评估乳腺癌患者的抗肿瘤免疫状态。方法:采用流式细胞术检测53例不同分期的乳腺癌患者化疗前外周血中CD4+Th细胞、CD4+CD25+Tr细胞水平,计算Th/Tr比值,并与30例健康志愿者进行比较。结果:有转移与无转移的乳腺癌患者Tr细胞绝对值差异无统计学意义(103±75vs 109±70,P=0.722)。有转移的乳腺癌患者Th/Tr淋巴细胞比值小于无转移者(3.83±1.37 vs 6.11±2.93,P<0.001),无转移患者小于健康志愿者(6.11±2.93 vs 11.24±1.84,P<0.001)。结论:Th/Tr比值对乳腺癌患者抗肿瘤免疫状态的评估优于Tr细胞计数,Th/Tr比值在乳腺癌患者尤其是有转移的乳腺癌患者中显著降低,其水平变化可作为评估乳腺癌患者免疫状态的有效指标。
基金supported by research funds from Canadian Institute of Health Research (MOP 79415, 81228 and 89713)
文摘CD4+ helper T (Th) cells play pivotal roles in induction of CD8+ CTL immunity. However, the mechanism of CD4+ T cell help delivery to CD8+ T cells in vivo is still elusive. In this study, we used ovalbumin (OVA)-pulsed dendritic cells (DCovA) to activate OT-II mouse CD4+ T cells, and then studied the help effect of these CD4+ T cells on CD8+ cytotoxic T lymphocyte (CTL) responses+ We also examined CTL mediated islet β cell destruction which leaded to diabetes in wild-type C57BL/6 mice and transgenic rat insulin promoter (RIP)-mOVA mice expressing β cell antigen OVA with self OVA-specific tolerance, respectively. In adoptive transfer experiments, we demonstrated that help, in the form of peptide/major histocompatibility complex (pMHC) I acquired from DCovA by DCovA activation, was required for induction of OVA-specific CTL responses in C57BL/6 mice. However, in combination + + + with TCR transgenlc OT-I mouse CD8 T ceils, the tolerogenic dosage of CD4+ Th cells with acquired pMHC I, but not CD4+ (Kb-/-) Th cells without acquired pMHC I were able to cause diabetes in 8/10 (80%) RIP-mOVA mice. This study thus expands the current knowledge in T cell-mediated autoimmunity and provides insight into the nature of CD4+ T cell-mediated help in CD8+ CTL induction. Cellular & Molecular Immunology. 2008;5(6):407-415.