Antiretroviral therapy(ART)can effectively inhibit human immunodeficiency virus-1(HIV-1)replication,but is not curative due to the existence of a stable viral latent reservoir harboring replication-competent proviruse...Antiretroviral therapy(ART)can effectively inhibit human immunodeficiency virus-1(HIV-1)replication,but is not curative due to the existence of a stable viral latent reservoir harboring replication-competent proviruses.In order to reduce or eliminate the HIV-1 latent reservoir,characteristics of the latently infected cells need to be intensively studied,and a comprehensive understanding of the heterogenous nature of the latent reservoir will be critical to develop novel therapeutic strategies.Here,we discuss the different cell types and mechanisms contributing to the complexity and heterogeneity of HIV-1 latent reservoirs,and summarize the key challenges to the development of cure strategies for acquired immunodeficiency syndrome(AIDS).展开更多
Background:Total human immunodeficiency virus(HIV)DNA and integrated HIV DNA are widely used markers of HIV persistence.Droplet digital polymerase chain reaction(ddPCR)can be used for absolute quantification without n...Background:Total human immunodeficiency virus(HIV)DNA and integrated HIV DNA are widely used markers of HIV persistence.Droplet digital polymerase chain reaction(ddPCR)can be used for absolute quantification without needing a standard curve.Here,we developed duplex ddPCR assays to detect and quantify total HIV DNA and integrated HIV DNA.Methods:The limit of detection,dynamic ranges,sensitivity,and reproducibility were evaluated by plasmid constructs containing both the HIV long terminal repeat(LTR)and human CD3 gene(for total HIV DNA)and ACH-2 cells(for integrated HIV DNA).Forty-two cases on stable suppressive antiretroviral therapy(ART)were assayed in total HIV DNA and integrated HIV DNA.Correlation coefficient analysis was performed on the data related to DNA copies and cluster of differentiation 4 positive(CD4^(+))T-cell counts,CD8^(+)T-cell counts and CD4/CD8 T-cell ratio,respectively.The assay linear dynamic range and lower limit of detection(LLOD)were also assessed.Results:The assay could detect the presence of HIV-1 copies 100%at concentrations of 6.3 copies/reaction,and the estimated LLOD of the ddPCR assay was 4.4 HIV DNA copies/reaction(95%confidence intervals[CI]:3.6-6.5 copies/reaction)with linearity over a 5-log_(10)-unit range in total HIV DNA assay.For the integrated HIV DNA assay,the LLOD was 8.0 copies/reaction(95%CI:5.8-16.6 copies/reaction)with linearity over a 3-log 10-unit range.Total HIV DNA in CD4^(+)T cells was positively associated with integrated HIV DNA(r=0.76,P<0.0001).Meanwhile,both total HIV DNA and integrated HIV DNA in CD4^(+)T cells were inversely correlated with the ratio of CD4/CD8 but positively correlated with the CD8^(+)T-cell counts.Conclusions:This ddPCR assay can quantify total HIV DNA and integrated HIV DNA efficiently with robustness and sensitivity.It can be readily adapted for measuring HIV DNA with non-B clades,and it could be beneficial for testing in clinical trials.展开更多
干细胞样记忆型T细胞(Stem memory T cells,Tscm)是最早期分化的、存活时间最长的一类记忆型T细胞。这类细胞具有自我更新及多能分化等干细胞特性,其在抗肿瘤中具有重要的作用,在HIV-1感染中的作用也开始成为研究热点。本文对Tscm细胞...干细胞样记忆型T细胞(Stem memory T cells,Tscm)是最早期分化的、存活时间最长的一类记忆型T细胞。这类细胞具有自我更新及多能分化等干细胞特性,其在抗肿瘤中具有重要的作用,在HIV-1感染中的作用也开始成为研究热点。本文对Tscm细胞的特点、CD4+Tscm细胞在HIV-1病毒储藏库中的重要性及CD8+Tscm细胞抗病毒作用的最新研究进行介绍。了解并充分利用Tscm细胞的特性及其在HIV-1感染中的作用,将有助于开发以Tscm为靶点的HIV-1疫苗及免疫治疗新方法,为HIV-1的防控及功能性治愈提供新的策略。展开更多
艾滋病(AIDS)是由人类免疫缺陷病毒(HIV)引起的获得性机体免疫缺陷综合征。高效抗反转录病毒治疗是目前治疗AIDS患者最有效的方法,其虽可降低病人体内病毒载量,但却不能彻底清除病毒。2012年“shock and kill”治疗策略被提出,该策略利...艾滋病(AIDS)是由人类免疫缺陷病毒(HIV)引起的获得性机体免疫缺陷综合征。高效抗反转录病毒治疗是目前治疗AIDS患者最有效的方法,其虽可降低病人体内病毒载量,但却不能彻底清除病毒。2012年“shock and kill”治疗策略被提出,该策略利用HIV潜伏激活剂(LRA)激活潜伏在CD4+T细胞内的HIV-1使其暴露,随后通过增强免疫系统或采用抗病毒药物消灭携带有病毒的宿主细胞,从而逐渐清除病毒潜伏库,最终实现艾滋病的功能性治愈。HIV-1潜伏机制主要有5种:表观遗传学调控、转录因子对基因的调控、免疫信号通路的调节、前病毒基因整合位点的影响和微RNA的影响。基于HIV-1的潜伏机制,目前有潜力作为LRA的药物主要包括表观遗传修饰剂、转录因子调节剂和免疫激活剂等。本文对以上几类药物的作用机制、代表性药物以及研究进展进行综述,以期为LRA研发提供思路。展开更多
基金This work was supported by grants from the National Special Research Program of China for Important Infectious Diseases(No.2018ZX10302103 and No.2017ZX10202102)National Natural Science Foundation of China(No.81672024)+1 种基金Natural Science Foundation of Guangdong Province of China(No.2017A030306005)Guangdong Innovative and Entrepreneurial Research Team Program(No.2016ZT06S638)。
文摘Antiretroviral therapy(ART)can effectively inhibit human immunodeficiency virus-1(HIV-1)replication,but is not curative due to the existence of a stable viral latent reservoir harboring replication-competent proviruses.In order to reduce or eliminate the HIV-1 latent reservoir,characteristics of the latently infected cells need to be intensively studied,and a comprehensive understanding of the heterogenous nature of the latent reservoir will be critical to develop novel therapeutic strategies.Here,we discuss the different cell types and mechanisms contributing to the complexity and heterogeneity of HIV-1 latent reservoirs,and summarize the key challenges to the development of cure strategies for acquired immunodeficiency syndrome(AIDS).
基金supported by the National Key R&D Program of China(Nos.2021YFC2301900 and 2021YFC2301905)the National 13th Five-Year Grand Program on Key Infectious Disease Control(Nos.2018ZX10301-101 and 2018ZX10301101-001-001)+3 种基金the National Natural Science Foundation of China(Nos.82241072,82072271,and 82272319)the High-Level Public Health Specialized Talents Project of Beijing Municipal Health Commission(Nos.2022-2-018 and 2022-1-007)the Climbing the peak(Dengfeng)Talent Training Program of Beijing Hospitals Authority(No.DFL20191701)Beijing Key Laboratory for HIV/AIDS Research(No.BZ0089).
文摘Background:Total human immunodeficiency virus(HIV)DNA and integrated HIV DNA are widely used markers of HIV persistence.Droplet digital polymerase chain reaction(ddPCR)can be used for absolute quantification without needing a standard curve.Here,we developed duplex ddPCR assays to detect and quantify total HIV DNA and integrated HIV DNA.Methods:The limit of detection,dynamic ranges,sensitivity,and reproducibility were evaluated by plasmid constructs containing both the HIV long terminal repeat(LTR)and human CD3 gene(for total HIV DNA)and ACH-2 cells(for integrated HIV DNA).Forty-two cases on stable suppressive antiretroviral therapy(ART)were assayed in total HIV DNA and integrated HIV DNA.Correlation coefficient analysis was performed on the data related to DNA copies and cluster of differentiation 4 positive(CD4^(+))T-cell counts,CD8^(+)T-cell counts and CD4/CD8 T-cell ratio,respectively.The assay linear dynamic range and lower limit of detection(LLOD)were also assessed.Results:The assay could detect the presence of HIV-1 copies 100%at concentrations of 6.3 copies/reaction,and the estimated LLOD of the ddPCR assay was 4.4 HIV DNA copies/reaction(95%confidence intervals[CI]:3.6-6.5 copies/reaction)with linearity over a 5-log_(10)-unit range in total HIV DNA assay.For the integrated HIV DNA assay,the LLOD was 8.0 copies/reaction(95%CI:5.8-16.6 copies/reaction)with linearity over a 3-log 10-unit range.Total HIV DNA in CD4^(+)T cells was positively associated with integrated HIV DNA(r=0.76,P<0.0001).Meanwhile,both total HIV DNA and integrated HIV DNA in CD4^(+)T cells were inversely correlated with the ratio of CD4/CD8 but positively correlated with the CD8^(+)T-cell counts.Conclusions:This ddPCR assay can quantify total HIV DNA and integrated HIV DNA efficiently with robustness and sensitivity.It can be readily adapted for measuring HIV DNA with non-B clades,and it could be beneficial for testing in clinical trials.
文摘干细胞样记忆型T细胞(Stem memory T cells,Tscm)是最早期分化的、存活时间最长的一类记忆型T细胞。这类细胞具有自我更新及多能分化等干细胞特性,其在抗肿瘤中具有重要的作用,在HIV-1感染中的作用也开始成为研究热点。本文对Tscm细胞的特点、CD4+Tscm细胞在HIV-1病毒储藏库中的重要性及CD8+Tscm细胞抗病毒作用的最新研究进行介绍。了解并充分利用Tscm细胞的特性及其在HIV-1感染中的作用,将有助于开发以Tscm为靶点的HIV-1疫苗及免疫治疗新方法,为HIV-1的防控及功能性治愈提供新的策略。
文摘艾滋病(AIDS)是由人类免疫缺陷病毒(HIV)引起的获得性机体免疫缺陷综合征。高效抗反转录病毒治疗是目前治疗AIDS患者最有效的方法,其虽可降低病人体内病毒载量,但却不能彻底清除病毒。2012年“shock and kill”治疗策略被提出,该策略利用HIV潜伏激活剂(LRA)激活潜伏在CD4+T细胞内的HIV-1使其暴露,随后通过增强免疫系统或采用抗病毒药物消灭携带有病毒的宿主细胞,从而逐渐清除病毒潜伏库,最终实现艾滋病的功能性治愈。HIV-1潜伏机制主要有5种:表观遗传学调控、转录因子对基因的调控、免疫信号通路的调节、前病毒基因整合位点的影响和微RNA的影响。基于HIV-1的潜伏机制,目前有潜力作为LRA的药物主要包括表观遗传修饰剂、转录因子调节剂和免疫激活剂等。本文对以上几类药物的作用机制、代表性药物以及研究进展进行综述,以期为LRA研发提供思路。
