Vaccination with chemokine genetransfected tumor cells may be a new apporach to cancer treatment. Macrohage inflammatory protein1α (MIP1α) is a new type of chemokines which has chemotactic activity on effector cells...Vaccination with chemokine genetransfected tumor cells may be a new apporach to cancer treatment. Macrohage inflammatory protein1α (MIP1α) is a new type of chemokines which has chemotactic activity on effector cells. In the present study, the B16 melanoma cells were transfected with recombinant adenovirus harboring murine MIP1α gene. The biological characteristics of the MIP1α gene transfected B16 melanoma cells were investigated. The level of MIP1α in the supernatant of genetransfected melanoma cells was 368±24 ng/ml/106/24hr. This supernatant showed strong chematactic activity for NK cells, CD4+ T cells, CD8+ T cells or the freshly isolated peritoneal macrophages. Though the in vitro growth were not altered, the tumorigenicity of the genetransfected B16 melanoma cells decreased signicantly. The infiltration of inflammatory cells into the tumor mass formed by MIP1α genetransfected B16 cells were much more obvious than that by wildtype B16 cells or B16 cells transfected with the control gene. However, the survival time of the mice bearing B16 melanoma cells transfected with MIP1α gene was not prolonged and the NK, CTL activity remianed unchanged. We suggested that the in vivo phenomenon may be related to the high toxicity of the MIP1 α as a strong nonspecific inflammatory mediator.展开更多
Mice with homologous disruption of the interferon γ(IFN-γ) gene on the C57BL/6 background were infected witly Leishmania major and the immune response assessed. In contrast to wild-type or heterozygous knockout mice...Mice with homologous disruption of the interferon γ(IFN-γ) gene on the C57BL/6 background were infected witly Leishmania major and the immune response assessed. In contrast to wild-type or heterozygous knockout mice,deficient animals were unable to restrict growth of the parasite and suffered lethal infection over 6￣8 wk.Although wild-type and heterozygous littermates developed CD4+ cells that contained transcripts for IFN-γ and lymphotoxin,tipical of T helper type 1(Th1) cells, the knockout mice developed CD+4 cells that contained transcripts for interleukin 4(IL-4),IL-5,and IL13,typical of Th2 cells. ELISPOT assays confirmed the reciprocal patterns of IFN-γ or IL-4 production by T cells in similar frequencies in the respective groups of mice,and antibody analysis confirmed the presence of Th2-mediated isotype switching in the knockout mice. These data suggest that CD4+ T cells that normally respond to antigens by differentiation to Th1 cells default to the Th2 pathway in the absence of endogenous IFN-γ.展开更多
Infections in infants and children under five years of age are a public health in México and are one of the major causes of death. Methods In this study, lymphocyte immunophenotyping for CD3+ (T-cells), CD3+CD4+,...Infections in infants and children under five years of age are a public health in México and are one of the major causes of death. Methods In this study, lymphocyte immunophenotyping for CD3+ (T-cells), CD3+CD4+, CD3+CD8+, CD3+CD19+, CD3+CD16/56+, CD45RA+, CD45RO+, CD62L- and CD28- were determined in the whole blood of gastrointestinal and respiratory bacterial infected children, using a four-color flow cytometry technique. Results: Our data showed that the percentages and the absolute numbers of monocytes and granulocytes are increased in infected children, when compared to the control group. Similarly, we observed increases in the percentages of B lymphocytes, CD8+ cells, memory T cells (CD4+CD45RO+ and CD8+CD45RO+) and effector lymphocytes (CD4+CD62L? and CD8+CD28?) in infected children compared with the control group. In contrast, naive T cells were decreased in the bacterial infected children relative to the control group. Additionally, we used ELISA assays to identify the pathogen agent in gastrointestinal and respiratory infection. Comparing different types of infection, we found that the children with respiratory bacterial infections had higher percentages of B lymphocytes, and cytotoxic lymphocytes (CD8+CD28-);and the children with gastrointestinal infections had higher percentages of CD3+ lymphocytes and effector cells (CD4+CD62L-). Conclusions The increase in B lymphocytes and CD8+CD28- cells in the children with respiratory infections and the increase of T lymphocytes and CD4+CD62L- cells in the children with gastrointestinal bacterial infections indicate that both cellular and humoral responses coincide, and both responses are necessary for eliminating the pathogen.展开更多
Multiple sclerosis （MS） is a chronic inflammatory and neurodegenerative disorder that is thought to be mediated by autoreactive T lymphocytes that find their way into the central nervous system （CNS）. The patholog...Multiple sclerosis （MS） is a chronic inflammatory and neurodegenerative disorder that is thought to be mediated by autoreactive T lymphocytes that find their way into the central nervous system （CNS）. The pathological mechanism of MS is still being elucidated but it involves complex interactions between infiltrating immune cells and resi- dent glial cells within the CNS that culminate into strong neuroinflammation and axonal damage.展开更多
Stem cell-like memory T(TSCM)cells possess stem cell properties including multipotency and self-renewal and are being recognized as emerging players in various human diseases.Advanced technologies such as multiparamet...Stem cell-like memory T(TSCM)cells possess stem cell properties including multipotency and self-renewal and are being recognized as emerging players in various human diseases.Advanced technologies such as multiparametric flowcytometry and single cell sequencing have enabled their identification and molecular characterization.In case of chronic viral diseases such as human immunodeficiency virus-1,CD4+T_(SCM) cells,serve as major reservoirs of the latent virus.However,during immune activation and functional exhaustion of effector T cells,these cells also possess the potential to replenish the pool of functional effector cells to curtail the infection.More recently,these cells are speculated to play important role in protective immunity following acute viral infections such as coronavirus disease 2019 and might be amenable for therapeutics by ex vivo expansion.Similarly,studies are also investigating their pathological role in driving autoimmune responses.However,there are several gaps in the understanding of the role of T_(SCM) cells in viral and autoimmune diseases to make them potential therapeutic targets.In this minireview,we have attempted an updated compilation of the dyadic role of these complex T_(SCM) cells during such human diseases along with their biology and transcriptional programs.展开更多
原发性中枢神经系统淋巴瘤(primary central nervous system lymphoma,PCNSL)是罕见类型的结外非霍奇金淋巴瘤,病灶只累及中枢神经系统。既往研究显示,嵌合抗原受体T(chimeric antigen receptor T,CAR-T)细胞治疗可改善PCNSL患者的缓解...原发性中枢神经系统淋巴瘤(primary central nervous system lymphoma,PCNSL)是罕见类型的结外非霍奇金淋巴瘤,病灶只累及中枢神经系统。既往研究显示,嵌合抗原受体T(chimeric antigen receptor T,CAR-T)细胞治疗可改善PCNSL患者的缓解深度和生存。CD19 CAR-T细胞疗法已成功治疗多种B细胞谱系恶性肿瘤,但其在中枢神经系统(central nervous system,CNS)表现的B细胞非霍奇金淋巴瘤中的应用尚有限,主要因为潜在的毒性。本文报告1例接受CD19 CAR-T细胞治疗后未出现任何级别的细胞因子释放综合征和免疫效应细胞相关神经毒性综合征且获完全缓解的难治性PCNSL患者,以期为该类患者的临床治疗提供借鉴。展开更多
目的探讨吉兰-巴雷综合征(Guillain-Barrésyndrome,GBS)患者外周血记忆性T细胞和记忆性B细胞亚群的变化及其临床意义。方法选取2018年6月至2020年12月于徐州医科大学附属医院神经内科住院的16例GBS患者作为研究组,并选取同期16名...目的探讨吉兰-巴雷综合征(Guillain-Barrésyndrome,GBS)患者外周血记忆性T细胞和记忆性B细胞亚群的变化及其临床意义。方法选取2018年6月至2020年12月于徐州医科大学附属医院神经内科住院的16例GBS患者作为研究组,并选取同期16名来院的健康体检者作为对照组。流式细胞术检测两组入选者的外周血T细胞亚群,包括CD4^(+)初始T细胞(naive T cells,TN)、CD4^(+)中央记忆性T细胞(central memory T cells,TCM)、CD4^(+)效应记忆性T细胞(effector memory T cells,TEM)和CD4^(+)终末分化效应记忆性T细胞(terminally differentiated effector memory T cells,TEMRA)及记忆性B细胞、浆母细胞的占比并分析其临床价值。结果与对照组相比,研究组患者的CD4^(+)TN及CD8^(+)TN均明显下降(P<0.05),CD4^(+)TEM及CD8^(+)TEM均明显升高(P<0.05),TCM及TEMRA在CD4和CD8上的比例比较,差异无统计学意义(P>0.05)。与对照组相比,研究组记忆性B细胞比例明显升高(P<0.05),两组患者间浆母细胞占比比较,差异无统计学意义(P>0.05)。GBS患者外周血CD4^(+)TEM及CD8^(+)TEM占比与Hughes残疾评分、脑脊液蛋白、脑脊液免疫球蛋白G及记忆性B细胞占比均呈正相关(P<0.05)。结论GBS患者存在记忆性T细胞和记忆性B细胞亚群免疫紊乱,CD4^(+)TEM细胞、CD8^(+)TEM细胞及记忆性B细胞占比升高,这很可能是GBS发病过程中重要的外周免疫机制。展开更多
BACKGROUND:Patients with sepsis often exhibit an acute inflammatory response,followed by an immunosuppressive phase with a poor immune response.However,the underlying mechanisms have not been fully elucidated.METHODS:...BACKGROUND:Patients with sepsis often exhibit an acute inflammatory response,followed by an immunosuppressive phase with a poor immune response.However,the underlying mechanisms have not been fully elucidated.METHODS:We sought to comprehensively characterize the transcriptional changes in neutrophils of patients with sepsis by transcriptome sequencing.Additionally,we conducted a series of experiments,including real-time quantitative polymerase chain reaction(RT-qPCR)and flow cytometry to investigate the role of arginase-1 signaling in sepsis.RESULTS:Through the analysis of gene expression profiles,we identified that the negative regulation of T cell activation signaling was enriched,and the expression of arginase-1 was high in neutrophils from patients with sepsis.Furthermore,we conducted flow cytometry and found that the function of CD8^(+)T cells in septic patients was impaired.Moreover,neutrophils from septic patients inhibited the percentage of polyfunctional effector CD8^(+)T cells through arginase-1.Additionally,the proportions of granzyme B^(+)IFN^(-)γ^(+)CD8^(+)T and TNF^(-)α^(+)IFN^(-)γ^(+)CD8^(+)T cells increased after inhibition of arginase-1 signaling.CONCLUSION:The impaired effector function of CD8^(+)T cells could be restored by blocking arginase-1 signaling in patients with sepsis.展开更多
In recent years,immune checkpoint inhibitors(ICIs)have made significant breakthroughs in the treatment of various tumors,greatly improving clinical efficacy.As the fifth most common antitumor treatment strategy for pa...In recent years,immune checkpoint inhibitors(ICIs)have made significant breakthroughs in the treatment of various tumors,greatly improving clinical efficacy.As the fifth most common antitumor treatment strategy for patients with solid tumors after surgery,chemotherapy,radiotherapy and targeted therapy,the therapeutic response to ICIs largely depends on the number and spatial distribution of effector T cells that can effectively identify and kill tumor cells,features that are also important when distinguishing malignant tumors from“cold tumors”or“hot tumors”.At present,only a small proportion of colorectal cancer(CRC)patients with deficient mismatch repair(dMMR)or who are microsatellite instability-high(MSI-H)can benefit from ICI treatments because these patients have the characteristics of a“hot tumor”,with a high tumor mutational burden(TMB)and massive immune cell infiltration,making the tumor more easily recognized by the immune system.In contrast,a majority of CRC patients with proficient MMR(pMMR)or who are microsatellite stable(MSS)have a low TMB,lack immune cell infiltration,and have almost no response to immune monotherapy;thus,these tumors are“cold”.The greatest challenge today is how to improve the immunotherapy response of“cold tumor”patients.With the development of clinical research,immunotherapies combined with other treatment strategies(such as targeted therapy,chemotherapy,and radiotherapy)have now become potentially effective clinical strategies and research hotspots.Therefore,the question of how to promote the transformation of“cold tumors”to“hot tumors”and break through the bottleneck of immunotherapy for cold tumors in CRC patients urgently requires consideration.Only by developing an in-depth understanding of the immunotherapy mechanisms of cold CRCs can we screen out the immunotherapy-dominant groups and explore the most suitable treatment options for individuals to improve therapeutic efficacy.展开更多
文摘Vaccination with chemokine genetransfected tumor cells may be a new apporach to cancer treatment. Macrohage inflammatory protein1α (MIP1α) is a new type of chemokines which has chemotactic activity on effector cells. In the present study, the B16 melanoma cells were transfected with recombinant adenovirus harboring murine MIP1α gene. The biological characteristics of the MIP1α gene transfected B16 melanoma cells were investigated. The level of MIP1α in the supernatant of genetransfected melanoma cells was 368±24 ng/ml/106/24hr. This supernatant showed strong chematactic activity for NK cells, CD4+ T cells, CD8+ T cells or the freshly isolated peritoneal macrophages. Though the in vitro growth were not altered, the tumorigenicity of the genetransfected B16 melanoma cells decreased signicantly. The infiltration of inflammatory cells into the tumor mass formed by MIP1α genetransfected B16 cells were much more obvious than that by wildtype B16 cells or B16 cells transfected with the control gene. However, the survival time of the mice bearing B16 melanoma cells transfected with MIP1α gene was not prolonged and the NK, CTL activity remianed unchanged. We suggested that the in vivo phenomenon may be related to the high toxicity of the MIP1 α as a strong nonspecific inflammatory mediator.
文摘Mice with homologous disruption of the interferon γ(IFN-γ) gene on the C57BL/6 background were infected witly Leishmania major and the immune response assessed. In contrast to wild-type or heterozygous knockout mice,deficient animals were unable to restrict growth of the parasite and suffered lethal infection over 6￣8 wk.Although wild-type and heterozygous littermates developed CD4+ cells that contained transcripts for IFN-γ and lymphotoxin,tipical of T helper type 1(Th1) cells, the knockout mice developed CD+4 cells that contained transcripts for interleukin 4(IL-4),IL-5,and IL13,typical of Th2 cells. ELISPOT assays confirmed the reciprocal patterns of IFN-γ or IL-4 production by T cells in similar frequencies in the respective groups of mice,and antibody analysis confirmed the presence of Th2-mediated isotype switching in the knockout mice. These data suggest that CD4+ T cells that normally respond to antigens by differentiation to Th1 cells default to the Th2 pathway in the absence of endogenous IFN-γ.
文摘Infections in infants and children under five years of age are a public health in México and are one of the major causes of death. Methods In this study, lymphocyte immunophenotyping for CD3+ (T-cells), CD3+CD4+, CD3+CD8+, CD3+CD19+, CD3+CD16/56+, CD45RA+, CD45RO+, CD62L- and CD28- were determined in the whole blood of gastrointestinal and respiratory bacterial infected children, using a four-color flow cytometry technique. Results: Our data showed that the percentages and the absolute numbers of monocytes and granulocytes are increased in infected children, when compared to the control group. Similarly, we observed increases in the percentages of B lymphocytes, CD8+ cells, memory T cells (CD4+CD45RO+ and CD8+CD45RO+) and effector lymphocytes (CD4+CD62L? and CD8+CD28?) in infected children compared with the control group. In contrast, naive T cells were decreased in the bacterial infected children relative to the control group. Additionally, we used ELISA assays to identify the pathogen agent in gastrointestinal and respiratory infection. Comparing different types of infection, we found that the children with respiratory bacterial infections had higher percentages of B lymphocytes, and cytotoxic lymphocytes (CD8+CD28-);and the children with gastrointestinal infections had higher percentages of CD3+ lymphocytes and effector cells (CD4+CD62L-). Conclusions The increase in B lymphocytes and CD8+CD28- cells in the children with respiratory infections and the increase of T lymphocytes and CD4+CD62L- cells in the children with gastrointestinal bacterial infections indicate that both cellular and humoral responses coincide, and both responses are necessary for eliminating the pathogen.
基金supported by the Helmholtz-Gemeinschaft,“Zukunft-sthema”Immunology and inflammation”(ZT-0027)supported by the Pertermax-Müller-Stiftung and the Niedersachsen Research Network on Neuroinfectiology(N-RENNT)of the Ministry of Science and Culture of Lower Saxony
文摘Multiple sclerosis （MS） is a chronic inflammatory and neurodegenerative disorder that is thought to be mediated by autoreactive T lymphocytes that find their way into the central nervous system （CNS）. The pathological mechanism of MS is still being elucidated but it involves complex interactions between infiltrating immune cells and resi- dent glial cells within the CNS that culminate into strong neuroinflammation and axonal damage.
文摘Stem cell-like memory T(TSCM)cells possess stem cell properties including multipotency and self-renewal and are being recognized as emerging players in various human diseases.Advanced technologies such as multiparametric flowcytometry and single cell sequencing have enabled their identification and molecular characterization.In case of chronic viral diseases such as human immunodeficiency virus-1,CD4+T_(SCM) cells,serve as major reservoirs of the latent virus.However,during immune activation and functional exhaustion of effector T cells,these cells also possess the potential to replenish the pool of functional effector cells to curtail the infection.More recently,these cells are speculated to play important role in protective immunity following acute viral infections such as coronavirus disease 2019 and might be amenable for therapeutics by ex vivo expansion.Similarly,studies are also investigating their pathological role in driving autoimmune responses.However,there are several gaps in the understanding of the role of T_(SCM) cells in viral and autoimmune diseases to make them potential therapeutic targets.In this minireview,we have attempted an updated compilation of the dyadic role of these complex T_(SCM) cells during such human diseases along with their biology and transcriptional programs.
文摘目的探讨吉兰-巴雷综合征(Guillain-Barrésyndrome,GBS)患者外周血记忆性T细胞和记忆性B细胞亚群的变化及其临床意义。方法选取2018年6月至2020年12月于徐州医科大学附属医院神经内科住院的16例GBS患者作为研究组,并选取同期16名来院的健康体检者作为对照组。流式细胞术检测两组入选者的外周血T细胞亚群,包括CD4^(+)初始T细胞(naive T cells,TN)、CD4^(+)中央记忆性T细胞(central memory T cells,TCM)、CD4^(+)效应记忆性T细胞(effector memory T cells,TEM)和CD4^(+)终末分化效应记忆性T细胞(terminally differentiated effector memory T cells,TEMRA)及记忆性B细胞、浆母细胞的占比并分析其临床价值。结果与对照组相比,研究组患者的CD4^(+)TN及CD8^(+)TN均明显下降(P<0.05),CD4^(+)TEM及CD8^(+)TEM均明显升高(P<0.05),TCM及TEMRA在CD4和CD8上的比例比较,差异无统计学意义(P>0.05)。与对照组相比,研究组记忆性B细胞比例明显升高(P<0.05),两组患者间浆母细胞占比比较,差异无统计学意义(P>0.05)。GBS患者外周血CD4^(+)TEM及CD8^(+)TEM占比与Hughes残疾评分、脑脊液蛋白、脑脊液免疫球蛋白G及记忆性B细胞占比均呈正相关(P<0.05)。结论GBS患者存在记忆性T细胞和记忆性B细胞亚群免疫紊乱,CD4^(+)TEM细胞、CD8^(+)TEM细胞及记忆性B细胞占比升高,这很可能是GBS发病过程中重要的外周免疫机制。
基金This work was supported by the Research Fund for the Key Laboratory of Anhui Province(KLICD-2022-Z2)the Scientific Research Fund of Anhui Medical University(2011×kj083)the Scientific Research Fund of the First People's Hospital of Hefei(201642).
文摘BACKGROUND:Patients with sepsis often exhibit an acute inflammatory response,followed by an immunosuppressive phase with a poor immune response.However,the underlying mechanisms have not been fully elucidated.METHODS:We sought to comprehensively characterize the transcriptional changes in neutrophils of patients with sepsis by transcriptome sequencing.Additionally,we conducted a series of experiments,including real-time quantitative polymerase chain reaction(RT-qPCR)and flow cytometry to investigate the role of arginase-1 signaling in sepsis.RESULTS:Through the analysis of gene expression profiles,we identified that the negative regulation of T cell activation signaling was enriched,and the expression of arginase-1 was high in neutrophils from patients with sepsis.Furthermore,we conducted flow cytometry and found that the function of CD8^(+)T cells in septic patients was impaired.Moreover,neutrophils from septic patients inhibited the percentage of polyfunctional effector CD8^(+)T cells through arginase-1.Additionally,the proportions of granzyme B^(+)IFN^(-)γ^(+)CD8^(+)T and TNF^(-)α^(+)IFN^(-)γ^(+)CD8^(+)T cells increased after inhibition of arginase-1 signaling.CONCLUSION:The impaired effector function of CD8^(+)T cells could be restored by blocking arginase-1 signaling in patients with sepsis.
基金Supported by National Natural Science Foundation of China,No.82073338Sichuan Science and Technology Support Project,No.2021YFSY0039 and No.22ZDYF0499+1 种基金The 1·3·5 Project for Disciplines of Excellence-Clinical Research Incubation Project West China Hospital,Sichuan University,No.2020HXFH002The 1.3.5 Project for Disciplines of Excellence,West China Hospital,Sichuan University,No.ZYJC21059.
文摘In recent years,immune checkpoint inhibitors(ICIs)have made significant breakthroughs in the treatment of various tumors,greatly improving clinical efficacy.As the fifth most common antitumor treatment strategy for patients with solid tumors after surgery,chemotherapy,radiotherapy and targeted therapy,the therapeutic response to ICIs largely depends on the number and spatial distribution of effector T cells that can effectively identify and kill tumor cells,features that are also important when distinguishing malignant tumors from“cold tumors”or“hot tumors”.At present,only a small proportion of colorectal cancer(CRC)patients with deficient mismatch repair(dMMR)or who are microsatellite instability-high(MSI-H)can benefit from ICI treatments because these patients have the characteristics of a“hot tumor”,with a high tumor mutational burden(TMB)and massive immune cell infiltration,making the tumor more easily recognized by the immune system.In contrast,a majority of CRC patients with proficient MMR(pMMR)or who are microsatellite stable(MSS)have a low TMB,lack immune cell infiltration,and have almost no response to immune monotherapy;thus,these tumors are“cold”.The greatest challenge today is how to improve the immunotherapy response of“cold tumor”patients.With the development of clinical research,immunotherapies combined with other treatment strategies(such as targeted therapy,chemotherapy,and radiotherapy)have now become potentially effective clinical strategies and research hotspots.Therefore,the question of how to promote the transformation of“cold tumors”to“hot tumors”and break through the bottleneck of immunotherapy for cold tumors in CRC patients urgently requires consideration.Only by developing an in-depth understanding of the immunotherapy mechanisms of cold CRCs can we screen out the immunotherapy-dominant groups and explore the most suitable treatment options for individuals to improve therapeutic efficacy.
