目的研究胃癌患者外周血记忆性干细胞样T细胞(memory stem cell T cells,TSCM)的分布特征,分析TSCM与临床病理特征的关系,探讨其临床应用价值。方法选取2018年7—12月在我院住院的胃癌患者32例为病例组,同期健康志愿者23例作为对照组。...目的研究胃癌患者外周血记忆性干细胞样T细胞(memory stem cell T cells,TSCM)的分布特征,分析TSCM与临床病理特征的关系,探讨其临床应用价值。方法选取2018年7—12月在我院住院的胃癌患者32例为病例组,同期健康志愿者23例作为对照组。流式细胞术检测胃癌患者外周血TSCM、初始T细胞(naive T cells,TN)、记忆性T细胞(memory T cells,TM)的比例,并比较其与对照组的差异,分析TN、TSCM、TSCM/TN值、TM与临床病理特征的关系。结果病例组患者外周血TN比例、TSCM比例均明显低于健康对照组,TSCM/TN值明显高于健康对照组,差异均有统计学意义(P<0.05)。TN比例与肿瘤TNM分期、浸润深度呈负相关,与组织分化程度呈正相关;TSCM/TN值与肿瘤TNM分期、浸润深度、淋巴结转移呈正相关。结论胃癌患者外周血TN、TSCM/TN值与肿瘤分期、浸润深度等临床病理特征密切相关,可作为一种新的方式用于评价患者的免疫状态;TSCM在胃癌的过继细胞免疫治疗中可能有重要的临床应用价值,但需大规模多中心临床研究进一步评价。展开更多
Background Adoptive cell transfer （ACT） immunotherapy has been used clinically for years to treat malignancies.Improving the killing efficiency of effector cells,such as tumor-specific cytotoxic T lymphocytes （CTLs...Background Adoptive cell transfer （ACT） immunotherapy has been used clinically for years to treat malignancies.Improving the killing efficiency of effector cells,such as tumor-specific cytotoxic T lymphocytes （CTLs）,is an important component for enhancing the clinical response of cancer immunotherapy.Hence,we explored a novel method for preparing cancer-specific CTLs using naive T lymphocytes.Methods C57BL/6 mice bearing B16 melanoma tumors were pretreated with cyclophosphamide （CTX） by peritoneal injection.The immunosuppressive influence of CTX on tumor regression and the tumor microenvironment was assessed.Naive T cells and T cell pools were isolated via negative selection using immunomagnetic beads.The proliferative potential and cytokine production of different T cell subpopulations were evaluated in vitro.Tumor-specific CTLs derived from naive T cells （naive CD4＋ T cells：naive CD8＋ T cells=2：1） and pooled T cells were generated in vitro,respectively.B16 melanoma-bearing C57BL/6 mice were pretreated with CTX,followed by ACT immunotherapy using dendritic cell-induced CTLs.The homing abilities of the effector cells and interleukin-2 （IL-2）,interferon-y,granzyme B,and perforin mRNA levels in tumor tissues were evaluated,and the change in tumor volume was measured.Results Mice receiving CTX peritoneal pretreatment injections did not display tumor regression compared with control mice.However,a significant downregulation of splenic Tregs and tumor growth factor-β1 （TGF-β1） and interleukin-10 （IL-10） serum levels was observed （P ＜0.05）.Naive T cells showed a stronger proliferative capacity and elevated cytokine production than did pooled T cells （P ＜0.05）.In addition,effector cells generated from naive T cells displayed more potent antitumor activity in vivo than those derived from pooled T cells （P ＜0.05）.Conclusion Effector cells derived from the naive T cells possess a stronger proliferative potential,homing capacity,and enhanced cytokine production,which l展开更多
虽然球虫激发宿主产生的保护性免疫应答机制已有很多相关研究,但是保护记忆性免疫应答机制这一关键点常常被忽视。高效保护记忆性免疫应答是球虫感染宿主和球虫病疫苗设计的基础。本研究对该领域50年的相关研究进行系统性回顾和分析,提...虽然球虫激发宿主产生的保护性免疫应答机制已有很多相关研究,但是保护记忆性免疫应答机制这一关键点常常被忽视。高效保护记忆性免疫应答是球虫感染宿主和球虫病疫苗设计的基础。本研究对该领域50年的相关研究进行系统性回顾和分析,提出开发高效球虫疫苗的设想和评估候选球虫病疫苗产生高效免疫保护的新策略,该设想和新策略基于产生高效保护性记忆免疫应答的三大关键点,即产生免疫水平的阈值、效应部位以及时间。结果表明:1)球虫病活卵囊疫苗与球虫重组蛋白疫苗、DNA疫苗、以病毒或细菌为载体的球虫病活载体疫苗免疫鸡群激发宿主产生的免疫应答存在本质区别,活卵囊疫苗免疫过的鸡对球虫的感染处于“Primed”免疫状态(即免疫系统可快速高效地识别球虫百余个抗原,抵抗球虫再次感染的能力更高。),而非活卵囊疫苗对球虫的感染仍处于“Naive”状态(即免疫系统仅能识别特定的1个或几个球虫抗原,抵抗球虫再次感染的能力较弱。)。这也是目前研发的基于一个或几个抗原的球虫“死”疫苗效果不佳的根本原因。2)高效的保护性记忆免疫应答的主要机制是多种效应机制协同发挥作用,如肠道微环境中的组织常驻记忆细胞(Tissue resident memory cells,T_(RM))、循环的效应记忆细胞(Effector memory T cells,TEM)、中心记忆性T细胞(Central memory T cell,T_(CM)),尤其是T_(RM)的量和质起关键作用。在疫苗设计中可以将抗原靶向可激发宿主产生针对鸡球虫高效保护性记忆免疫应答的重要部位—肠道。3)抑制球虫早期裂殖生殖是记忆性免疫应答抵抗球虫感染最重要的特征,为评估高效球虫疫苗提供了新思路。综上,对鸡球虫感染过程中产生高效免疫保护的机制有清晰的认识和理解,是实现基于免疫学理论的球虫病科学防控的基础。展开更多
文摘目的研究胃癌患者外周血记忆性干细胞样T细胞(memory stem cell T cells,TSCM)的分布特征,分析TSCM与临床病理特征的关系,探讨其临床应用价值。方法选取2018年7—12月在我院住院的胃癌患者32例为病例组,同期健康志愿者23例作为对照组。流式细胞术检测胃癌患者外周血TSCM、初始T细胞(naive T cells,TN)、记忆性T细胞(memory T cells,TM)的比例,并比较其与对照组的差异,分析TN、TSCM、TSCM/TN值、TM与临床病理特征的关系。结果病例组患者外周血TN比例、TSCM比例均明显低于健康对照组,TSCM/TN值明显高于健康对照组,差异均有统计学意义(P<0.05)。TN比例与肿瘤TNM分期、浸润深度呈负相关,与组织分化程度呈正相关;TSCM/TN值与肿瘤TNM分期、浸润深度、淋巴结转移呈正相关。结论胃癌患者外周血TN、TSCM/TN值与肿瘤分期、浸润深度等临床病理特征密切相关,可作为一种新的方式用于评价患者的免疫状态;TSCM在胃癌的过继细胞免疫治疗中可能有重要的临床应用价值,但需大规模多中心临床研究进一步评价。
文摘Background Adoptive cell transfer （ACT） immunotherapy has been used clinically for years to treat malignancies.Improving the killing efficiency of effector cells,such as tumor-specific cytotoxic T lymphocytes （CTLs）,is an important component for enhancing the clinical response of cancer immunotherapy.Hence,we explored a novel method for preparing cancer-specific CTLs using naive T lymphocytes.Methods C57BL/6 mice bearing B16 melanoma tumors were pretreated with cyclophosphamide （CTX） by peritoneal injection.The immunosuppressive influence of CTX on tumor regression and the tumor microenvironment was assessed.Naive T cells and T cell pools were isolated via negative selection using immunomagnetic beads.The proliferative potential and cytokine production of different T cell subpopulations were evaluated in vitro.Tumor-specific CTLs derived from naive T cells （naive CD4＋ T cells：naive CD8＋ T cells=2：1） and pooled T cells were generated in vitro,respectively.B16 melanoma-bearing C57BL/6 mice were pretreated with CTX,followed by ACT immunotherapy using dendritic cell-induced CTLs.The homing abilities of the effector cells and interleukin-2 （IL-2）,interferon-y,granzyme B,and perforin mRNA levels in tumor tissues were evaluated,and the change in tumor volume was measured.Results Mice receiving CTX peritoneal pretreatment injections did not display tumor regression compared with control mice.However,a significant downregulation of splenic Tregs and tumor growth factor-β1 （TGF-β1） and interleukin-10 （IL-10） serum levels was observed （P ＜0.05）.Naive T cells showed a stronger proliferative capacity and elevated cytokine production than did pooled T cells （P ＜0.05）.In addition,effector cells generated from naive T cells displayed more potent antitumor activity in vivo than those derived from pooled T cells （P ＜0.05）.Conclusion Effector cells derived from the naive T cells possess a stronger proliferative potential,homing capacity,and enhanced cytokine production,which l
文摘虽然球虫激发宿主产生的保护性免疫应答机制已有很多相关研究,但是保护记忆性免疫应答机制这一关键点常常被忽视。高效保护记忆性免疫应答是球虫感染宿主和球虫病疫苗设计的基础。本研究对该领域50年的相关研究进行系统性回顾和分析,提出开发高效球虫疫苗的设想和评估候选球虫病疫苗产生高效免疫保护的新策略,该设想和新策略基于产生高效保护性记忆免疫应答的三大关键点,即产生免疫水平的阈值、效应部位以及时间。结果表明:1)球虫病活卵囊疫苗与球虫重组蛋白疫苗、DNA疫苗、以病毒或细菌为载体的球虫病活载体疫苗免疫鸡群激发宿主产生的免疫应答存在本质区别,活卵囊疫苗免疫过的鸡对球虫的感染处于“Primed”免疫状态(即免疫系统可快速高效地识别球虫百余个抗原,抵抗球虫再次感染的能力更高。),而非活卵囊疫苗对球虫的感染仍处于“Naive”状态(即免疫系统仅能识别特定的1个或几个球虫抗原,抵抗球虫再次感染的能力较弱。)。这也是目前研发的基于一个或几个抗原的球虫“死”疫苗效果不佳的根本原因。2)高效的保护性记忆免疫应答的主要机制是多种效应机制协同发挥作用,如肠道微环境中的组织常驻记忆细胞(Tissue resident memory cells,T_(RM))、循环的效应记忆细胞(Effector memory T cells,TEM)、中心记忆性T细胞(Central memory T cell,T_(CM)),尤其是T_(RM)的量和质起关键作用。在疫苗设计中可以将抗原靶向可激发宿主产生针对鸡球虫高效保护性记忆免疫应答的重要部位—肠道。3)抑制球虫早期裂殖生殖是记忆性免疫应答抵抗球虫感染最重要的特征,为评估高效球虫疫苗提供了新思路。综上,对鸡球虫感染过程中产生高效免疫保护的机制有清晰的认识和理解,是实现基于免疫学理论的球虫病科学防控的基础。
