Neutralizing antibodies are recognized to be one of the essential elements of the adaptive immune response that must be induced by an effective vaccine against HIV. However, only a limited number of antibodies have be...Neutralizing antibodies are recognized to be one of the essential elements of the adaptive immune response that must be induced by an effective vaccine against HIV. However, only a limited number of antibodies have been identified to neutralize a broad range of primary isolates of HIV-1 and attempts to induce such antibodies by inununization were unsuccessful. The difficulties to generate such antibodies are mainly due to intrinsic properties of HIV-1 envelope spikes, such as high sequence diversity, heavy glycosylation, and inducible and transient nature of certain epitopes. In vitro neutralizing antibodies are identified using ＂conventional＂ neutralization assay which uses phytohemagglutinin （PHA）-stimulated human PBMCs as target cells. Thus, in essence the assay evaluates HIV-1 replication in CD4^＋T cells. Recently, several laboratories including us demonstrated that some monoclonal antibodies and HIV-1-specific polyclonal IgG purified from patient sera, although they do not have neutralizing activity when tested by the ＂conventional＂ neutralization assay, do exhibit potent and broad neutralizing activity in ＂unconventional＂ ways. The neutralizing activity of these antibodies and IgG fractions is acquired through post-translational modifications, through opsonization of virus particles into macrophages and inunature dendritic cells （iDCs）, or through expression of antibodies on the surface of HIV-1-susceptible cells. This review will focus on recent findings of this area and point out their potential applications in the development of preventive strategies against HIV.展开更多
目的:了解我国四川和重庆地区在校大中学生男男性接触者(men who have sex with men,MSM)的艾滋病病毒(human immunodeficiency virus,HIV)感染状态、艾滋病相关危险性行为、最近6个月多性伴(性伴数≥2个)行为的影响因素。方法:在重庆...目的:了解我国四川和重庆地区在校大中学生男男性接触者(men who have sex with men,MSM)的艾滋病病毒(human immunodeficiency virus,HIV)感染状态、艾滋病相关危险性行为、最近6个月多性伴(性伴数≥2个)行为的影响因素。方法:在重庆和四川采用非概率抽样,共招募200名在校大中学生参与问卷调查和现场HIV检测。采用频率描述HIV感染率,采用Logistic回归模型分析最近6个月多性伴行为(性伴数≥2个)的影响因素。结果:本研究共回收调查问卷200份,有效问卷193份(96.50%)。HIV抗体阳性检出率为8.29%,在读学校是中学(高中/中专/职高)、大专、大学本科及以上的HIV阳性检出率分别为17.95%、8.33%、5.08%;户口是农村的和在此之前未做过HIV检测阳性检出率分别为12.70%、11.11%。最近1个月内82.47%(127人)发生插入性行为时未每次使用安全套;最近6个月内51.81%(100人)有多性伴行为(性伴数≥2个)。多因素logistic回归显示最近6个月内多性伴行为(性伴数≥2个)的独立因素有:在读学校是大专(OR=4.270,P=0.0083)、在读学校是大学及以上(OR=3.523,P=0.0043)、最近6个月通过互联网寻找男性性伴(OR=5.622,P<0.0001)、最近1个月内无保护插入式性行为(OR=2.255,P=0.0201)。结论:我国四川和重庆地区大中学生MSM的HIV感染率高,尤其是中学生MSM和农村户口的学生MSM的HIV感染率高,同时四川和重庆地区大中学生MSM危险性行为发生率高,多性伴行为普遍,应及时开展科学适用的干预方式,遏制艾滋病毒在学生MSM中的流行。展开更多
基金Chinese Ministry of Science and Technology 973 program grant awarded to Paul Zhou(2006CB504308).
文摘Neutralizing antibodies are recognized to be one of the essential elements of the adaptive immune response that must be induced by an effective vaccine against HIV. However, only a limited number of antibodies have been identified to neutralize a broad range of primary isolates of HIV-1 and attempts to induce such antibodies by inununization were unsuccessful. The difficulties to generate such antibodies are mainly due to intrinsic properties of HIV-1 envelope spikes, such as high sequence diversity, heavy glycosylation, and inducible and transient nature of certain epitopes. In vitro neutralizing antibodies are identified using ＂conventional＂ neutralization assay which uses phytohemagglutinin （PHA）-stimulated human PBMCs as target cells. Thus, in essence the assay evaluates HIV-1 replication in CD4^＋T cells. Recently, several laboratories including us demonstrated that some monoclonal antibodies and HIV-1-specific polyclonal IgG purified from patient sera, although they do not have neutralizing activity when tested by the ＂conventional＂ neutralization assay, do exhibit potent and broad neutralizing activity in ＂unconventional＂ ways. The neutralizing activity of these antibodies and IgG fractions is acquired through post-translational modifications, through opsonization of virus particles into macrophages and inunature dendritic cells （iDCs）, or through expression of antibodies on the surface of HIV-1-susceptible cells. This review will focus on recent findings of this area and point out their potential applications in the development of preventive strategies against HIV.
文摘目的评价Roche电化学发光法联合检测HIV抗原抗体试剂的检测性能。方法收集包括健康献血员、人类免疫缺陷病毒(HIV)感染者、丙型肝炎病毒(HCV)抗体阳性和高危人群在内的血清样本1 327例。购买美国BBI公司的7套HIV血清转换盘共计51份血清样本。采用Roche cobas e411(架式系统)电化学全自动免疫分析仪和相应的检测试剂、校准品和质控品以及检测参数进行测定。以Roche Elecsys HIV Combi试剂盒为评估试剂,以生物梅里埃Vironostika Uni-FormⅡplus O HIV抗体试剂盒为参比试剂。定性检测血清HIV p24抗原和HIV1/2抗体并评价检测方法分析性能、结果一致性和血清转化灵敏度。结果 Roche Elecsys HIV Combi试剂盒批内和天间不精密度良好,符合临床使用要求。血清样本检测结果和参比试剂检测结果一致性完全符合。评估试剂的血清转化灵敏度比参比试剂平均提前了5.1 d。结论 Roche Elecsys HIV Combi试剂盒具有良好的精密度和血清转换灵敏度,有利于筛查HIV早期感染,能为临床HIV早期诊断、随访监测提供有效的实验室诊断依据。
文摘目的:了解我国四川和重庆地区在校大中学生男男性接触者(men who have sex with men,MSM)的艾滋病病毒(human immunodeficiency virus,HIV)感染状态、艾滋病相关危险性行为、最近6个月多性伴(性伴数≥2个)行为的影响因素。方法:在重庆和四川采用非概率抽样,共招募200名在校大中学生参与问卷调查和现场HIV检测。采用频率描述HIV感染率,采用Logistic回归模型分析最近6个月多性伴行为(性伴数≥2个)的影响因素。结果:本研究共回收调查问卷200份,有效问卷193份(96.50%)。HIV抗体阳性检出率为8.29%,在读学校是中学(高中/中专/职高)、大专、大学本科及以上的HIV阳性检出率分别为17.95%、8.33%、5.08%;户口是农村的和在此之前未做过HIV检测阳性检出率分别为12.70%、11.11%。最近1个月内82.47%(127人)发生插入性行为时未每次使用安全套;最近6个月内51.81%(100人)有多性伴行为(性伴数≥2个)。多因素logistic回归显示最近6个月内多性伴行为(性伴数≥2个)的独立因素有:在读学校是大专(OR=4.270,P=0.0083)、在读学校是大学及以上(OR=3.523,P=0.0043)、最近6个月通过互联网寻找男性性伴(OR=5.622,P<0.0001)、最近1个月内无保护插入式性行为(OR=2.255,P=0.0201)。结论:我国四川和重庆地区大中学生MSM的HIV感染率高,尤其是中学生MSM和农村户口的学生MSM的HIV感染率高,同时四川和重庆地区大中学生MSM危险性行为发生率高,多性伴行为普遍,应及时开展科学适用的干预方式,遏制艾滋病毒在学生MSM中的流行。
