目的研究细胞程序性死亡配体-1(programmed cell death protein ligand-1,PD-L1)功能抑制调控免疫活化影响ApoE^(-/-)小鼠动脉粥样硬化发生发展的机制。方法将24只ApoE^(-/-)小鼠随机分为正常组,高脂组和高脂^(+)抗PD-L1单抗组,通过高...目的研究细胞程序性死亡配体-1(programmed cell death protein ligand-1,PD-L1)功能抑制调控免疫活化影响ApoE^(-/-)小鼠动脉粥样硬化发生发展的机制。方法将24只ApoE^(-/-)小鼠随机分为正常组,高脂组和高脂^(+)抗PD-L1单抗组,通过高胆固醇饲料喂养建立动脉粥样硬化(atherosclerosis)模型。实验动物饲养70 d后,分离各组实验动物血管(主动脉根部至腹主动脉)及肝脏组织,进行油红O染色;HE染色检测肝组织病理改变;ELISA检测血清中总胆固醇(CHO)、甘油三酯(TG)、高密度脂蛋白(HDL-c)、低密度脂蛋白(LDL-c)和炎症因子(IFN-γ、TNF-α、IL-1β)含量。流式细胞计数检测肝脏淋巴细胞(CD4^(+)、CD8^(+)、CD4^(+)IFN-γ^(+)和CD8^(+)IFN-γ^(+)T细胞)。RT-PCR检测肝脏组织IFN-γ、TNF-α、IL-1β、CD4和CD8表达。结果与高脂组比较,给予抗PD-L1单抗后促血管壁及肝脏脂质累积并上调血清及肝组织CHO、TG、LDL-c和HDL-c含量。高脂饲养条件下给予抗PD-L1单抗促血清和肝组织谷丙转氨酶(GPT)和谷草转氨酶(GOT)含量升高,但是对碱性磷酸酶(AKP)含量没有影响。高脂饲养条件下给予抗PD-L1单抗促血清和肝脏组织IFN-γ、TNF-α和IL-1β含量升高。高脂饲养条件下给予抗PD-L1单抗抑制CD4表达及促CD8表达。高脂饲养条件下给予抗PD-L1单抗促肝脏CD8^(+)T和CD8^(+)IFN-γ^(+)T细胞活化,但是对CD4^(+)IFN-γ^(+)T细胞活化没有影响。结论高脂饲养条件下给予抗PD-L1单抗通过活化肝脏CD8^(+)IFN-γ^(+)T细胞损伤肝脏功能加重动脉粥样硬化。展开更多
A novel coronavirus, severe acute respiratory syndrome (SA RS)-associated coronavirus (SARS-CoV), has been identified as the causal agent of SARS. Spike (S) protein is a major structural glycoprotein of the SARS virus...A novel coronavirus, severe acute respiratory syndrome (SA RS)-associated coronavirus (SARS-CoV), has been identified as the causal agent of SARS. Spike (S) protein is a major structural glycoprotein of the SARS virus and a potential target for SARS-specific cell-mediated immune responses. A pa nel of S protein-derived peptides was tested for their binding affinity to HLA -A *0201 molecules. Peptides with high affinity for HLA-A *0201 were then as se ssed for their capacity to elicit specific immune responses mediated by cytotoxi c T lymphocytes (CTLs) both in vivo, in HLA-A2.1/K b transgenic mice, a nd in vitro, from peripheral blood lymphocytes (PBLs) harvested from healthy HLA-A 2.1 + donors. SARS-CoV protein-derived peptide-1 (SSp-1 RLNEVAKNL), induced pepti de-specific CTLs both in vivo (transgenic mice) and in vitro (human PBL s), which specifically released interferon-gamma (IFN-gamma) upon stimulation with SSp-1-pulsed autologous dendritic cells (DCs) or T2 cells. SSp-1-specif ic CTLs also lysed major histocompatibility complex (MHC)-matched tumor cell lines engineered to express S proteins. HLA-A *0201-SSp-1 tetramer staining re vealed the presence of significant populations of SSp-1-specific CTLs in SSp- 1-induced CD8 + T cells. We propose that the newly identified epitope SSp-1 w ill help in the characterization of virus control mechanisms and immunopathology in SARS-CoV infection, and may be relevant to the development of immunotherape utic approaches for SARS.展开更多
A novel coronavirus, severe acute respiratory syndrome (SARS)-associated coronavirus (SARS-CoV), has been identified as the causal agent of SARS. Spike (S) protein is a major structural glycoprotein of the SARS virus ...A novel coronavirus, severe acute respiratory syndrome (SARS)-associated coronavirus (SARS-CoV), has been identified as the causal agent of SARS. Spike (S) protein is a major structural glycoprotein of the SARS virus and a potential target for SARS-specific cell-mediated immune responses. A panel of S protein-derived peptides was tested for their binding affinity to HLA-A*0201 molecules. Peptides with high affinity for HLA-A*0201 were then assessed for their capacity to elicit specific immune responses mediated by cytotoxic T lymphocytes (CTLs) both in vivo, in HLA-A2.1/K b transgenic mice, and in vitro, from peripheral blood lymphocytes (PBLs) harvested from healthy HLA-A2.1(+) donors. SARS-CoV protein-derived peptide-1 (SSp-1 RLNEVAKNL), induced peptide-specific CTLs both in vivo (transgenic mice) and in vitro (human PBLs), which specifically released interferon-gamma (IFN-γ) upon stimulation with SSp-1-pulsed autologous dendritic cells (DCs) or T2 cells. SSp-1-specific CTLs also lysed major histocompatibility complex (MHC)-matched tumor cell lines engineered to express S proteins. HLA-A*0201-SSp-1 tetramer staining revealed the presence of significant populations of SSp-1-specific CTLs in SSp-1-induced CD8+ T cells. We propose that the newly identified epitope SSp-1 will help in the characterization of virus control mechanisms and immunopathology in SARS-CoV infection, and may be relevant to the development of immunotherapeutic approaches for SARS.展开更多
目的以雌性和雄性非肥胖糖尿病(nonobese diabetic,NOD)小鼠以及健康对照癌症研究所(institute for cancer research,ICR)小鼠为研究对象,比较分析初始、效应、记忆、耗竭以及调节性CD8^(+)T细胞分化亚群差异,探讨1型糖尿病(type 1 diab...目的以雌性和雄性非肥胖糖尿病(nonobese diabetic,NOD)小鼠以及健康对照癌症研究所(institute for cancer research,ICR)小鼠为研究对象,比较分析初始、效应、记忆、耗竭以及调节性CD8^(+)T细胞分化亚群差异,探讨1型糖尿病(type 1 diabetes,T1D)背景下的性别因素对CD8^(+)T细胞分化命运的影响。方法采用流式细胞术检测雌雄NOD小鼠脾脏、胰腺引流淋巴结(pancreatic draining lymph nodes,pLN)、胰腺浸润淋巴细胞(pancreas-infiltrating lymphocytes,PIL)、初始T细胞(naive T cells,T_(N))、中枢记忆T细胞(central memory T cells,T_(CM))、效应T细胞(effector T cells,T_(EFF))、效应前体样T细胞(effector precursor T cells,T_(EP))、耗竭T细胞(exhausted T cells,T_(EX))、耗竭前体T细胞(precursor exhausted T cells,T_(PEX))以及调节性T细胞(regulatory T cells,Tregs)等CD8^(+)T细胞分化亚群的频率和表型差异。结果与雄性NOD小鼠比较,雌性NOD小鼠pLN及PIL中IFN-γ^(+)、CD107a^(+)和CCL5^(+)CD8^(+)T_(EFF)频率显著升高(P<0.01,P<0.05,P<0.05),同时脾脏中CD8^(+)T_(N)、CD8^(+)T_(CM)、CD8^(+)T_(EX)、CD8^(+)T_(PEX)和CD122^(+)CD8^(+)Tregs亚群的频率均显著降低(P<0.01,P<0.01,P<0.01,P<0.01,P<0.001);而雌性和雄性ICR小鼠体内除CD122^(+)CD8^(+)Tregs差异变化与NOD小鼠一致(P<0.05),其余上述各CD8^(+)T细胞分化亚群无显著差异。结论雄激素可能通过抑制记忆T细胞向效应T细胞分化,同时促进效应T细胞功能耗竭,导致雌雄发病率差异。展开更多
文摘目的研究细胞程序性死亡配体-1(programmed cell death protein ligand-1,PD-L1)功能抑制调控免疫活化影响ApoE^(-/-)小鼠动脉粥样硬化发生发展的机制。方法将24只ApoE^(-/-)小鼠随机分为正常组,高脂组和高脂^(+)抗PD-L1单抗组,通过高胆固醇饲料喂养建立动脉粥样硬化(atherosclerosis)模型。实验动物饲养70 d后,分离各组实验动物血管(主动脉根部至腹主动脉)及肝脏组织,进行油红O染色;HE染色检测肝组织病理改变;ELISA检测血清中总胆固醇(CHO)、甘油三酯(TG)、高密度脂蛋白(HDL-c)、低密度脂蛋白(LDL-c)和炎症因子(IFN-γ、TNF-α、IL-1β)含量。流式细胞计数检测肝脏淋巴细胞(CD4^(+)、CD8^(+)、CD4^(+)IFN-γ^(+)和CD8^(+)IFN-γ^(+)T细胞)。RT-PCR检测肝脏组织IFN-γ、TNF-α、IL-1β、CD4和CD8表达。结果与高脂组比较,给予抗PD-L1单抗后促血管壁及肝脏脂质累积并上调血清及肝组织CHO、TG、LDL-c和HDL-c含量。高脂饲养条件下给予抗PD-L1单抗促血清和肝组织谷丙转氨酶(GPT)和谷草转氨酶(GOT)含量升高,但是对碱性磷酸酶(AKP)含量没有影响。高脂饲养条件下给予抗PD-L1单抗促血清和肝脏组织IFN-γ、TNF-α和IL-1β含量升高。高脂饲养条件下给予抗PD-L1单抗抑制CD4表达及促CD8表达。高脂饲养条件下给予抗PD-L1单抗促肝脏CD8^(+)T和CD8^(+)IFN-γ^(+)T细胞活化,但是对CD4^(+)IFN-γ^(+)T细胞活化没有影响。结论高脂饲养条件下给予抗PD-L1单抗通过活化肝脏CD8^(+)IFN-γ^(+)T细胞损伤肝脏功能加重动脉粥样硬化。
文摘A novel coronavirus, severe acute respiratory syndrome (SA RS)-associated coronavirus (SARS-CoV), has been identified as the causal agent of SARS. Spike (S) protein is a major structural glycoprotein of the SARS virus and a potential target for SARS-specific cell-mediated immune responses. A pa nel of S protein-derived peptides was tested for their binding affinity to HLA -A *0201 molecules. Peptides with high affinity for HLA-A *0201 were then as se ssed for their capacity to elicit specific immune responses mediated by cytotoxi c T lymphocytes (CTLs) both in vivo, in HLA-A2.1/K b transgenic mice, a nd in vitro, from peripheral blood lymphocytes (PBLs) harvested from healthy HLA-A 2.1 + donors. SARS-CoV protein-derived peptide-1 (SSp-1 RLNEVAKNL), induced pepti de-specific CTLs both in vivo (transgenic mice) and in vitro (human PBL s), which specifically released interferon-gamma (IFN-gamma) upon stimulation with SSp-1-pulsed autologous dendritic cells (DCs) or T2 cells. SSp-1-specif ic CTLs also lysed major histocompatibility complex (MHC)-matched tumor cell lines engineered to express S proteins. HLA-A *0201-SSp-1 tetramer staining re vealed the presence of significant populations of SSp-1-specific CTLs in SSp- 1-induced CD8 + T cells. We propose that the newly identified epitope SSp-1 w ill help in the characterization of virus control mechanisms and immunopathology in SARS-CoV infection, and may be relevant to the development of immunotherape utic approaches for SARS.
文摘A novel coronavirus, severe acute respiratory syndrome (SARS)-associated coronavirus (SARS-CoV), has been identified as the causal agent of SARS. Spike (S) protein is a major structural glycoprotein of the SARS virus and a potential target for SARS-specific cell-mediated immune responses. A panel of S protein-derived peptides was tested for their binding affinity to HLA-A*0201 molecules. Peptides with high affinity for HLA-A*0201 were then assessed for their capacity to elicit specific immune responses mediated by cytotoxic T lymphocytes (CTLs) both in vivo, in HLA-A2.1/K b transgenic mice, and in vitro, from peripheral blood lymphocytes (PBLs) harvested from healthy HLA-A2.1(+) donors. SARS-CoV protein-derived peptide-1 (SSp-1 RLNEVAKNL), induced peptide-specific CTLs both in vivo (transgenic mice) and in vitro (human PBLs), which specifically released interferon-gamma (IFN-γ) upon stimulation with SSp-1-pulsed autologous dendritic cells (DCs) or T2 cells. SSp-1-specific CTLs also lysed major histocompatibility complex (MHC)-matched tumor cell lines engineered to express S proteins. HLA-A*0201-SSp-1 tetramer staining revealed the presence of significant populations of SSp-1-specific CTLs in SSp-1-induced CD8+ T cells. We propose that the newly identified epitope SSp-1 will help in the characterization of virus control mechanisms and immunopathology in SARS-CoV infection, and may be relevant to the development of immunotherapeutic approaches for SARS.
文摘目的以雌性和雄性非肥胖糖尿病(nonobese diabetic,NOD)小鼠以及健康对照癌症研究所(institute for cancer research,ICR)小鼠为研究对象,比较分析初始、效应、记忆、耗竭以及调节性CD8^(+)T细胞分化亚群差异,探讨1型糖尿病(type 1 diabetes,T1D)背景下的性别因素对CD8^(+)T细胞分化命运的影响。方法采用流式细胞术检测雌雄NOD小鼠脾脏、胰腺引流淋巴结(pancreatic draining lymph nodes,pLN)、胰腺浸润淋巴细胞(pancreas-infiltrating lymphocytes,PIL)、初始T细胞(naive T cells,T_(N))、中枢记忆T细胞(central memory T cells,T_(CM))、效应T细胞(effector T cells,T_(EFF))、效应前体样T细胞(effector precursor T cells,T_(EP))、耗竭T细胞(exhausted T cells,T_(EX))、耗竭前体T细胞(precursor exhausted T cells,T_(PEX))以及调节性T细胞(regulatory T cells,Tregs)等CD8^(+)T细胞分化亚群的频率和表型差异。结果与雄性NOD小鼠比较,雌性NOD小鼠pLN及PIL中IFN-γ^(+)、CD107a^(+)和CCL5^(+)CD8^(+)T_(EFF)频率显著升高(P<0.01,P<0.05,P<0.05),同时脾脏中CD8^(+)T_(N)、CD8^(+)T_(CM)、CD8^(+)T_(EX)、CD8^(+)T_(PEX)和CD122^(+)CD8^(+)Tregs亚群的频率均显著降低(P<0.01,P<0.01,P<0.01,P<0.01,P<0.001);而雌性和雄性ICR小鼠体内除CD122^(+)CD8^(+)Tregs差异变化与NOD小鼠一致(P<0.05),其余上述各CD8^(+)T细胞分化亚群无显著差异。结论雄激素可能通过抑制记忆T细胞向效应T细胞分化,同时促进效应T细胞功能耗竭,导致雌雄发病率差异。
