Sci Immunol:中外科学家合作揭示中东呼吸综合征病人的细胞免疫特征

2017-08-07 BioArt BioArt

MERS-CoV是一种新型冠状病毒,2012年首发于沙特,2013年被世界卫生组织(WHO)正式命名为中东呼吸综合征冠状病毒(Middle East Respiratory Syndrome coronavirus, MERS-CoV)。截止2017年8月,共感染2040人,712人死亡,病死率近35%,目前疫情仍处于流行状态,已传播到包括我国在内共27个国家和地区,尚无有效的治疗药物和预防疫苗。

MERS-CoV是一种新型冠状病毒,2012年首发于沙特,2013年被世界卫生组织(WHO)正式命名为中东呼吸综合征冠状病毒(Middle East Respiratory Syndrome coronavirus, MERS-CoV)。截止2017年8月,共感染2040人,712人死亡,病死率近35%,目前疫情仍处于流行状态,已传播到包括我国在内共27个国家和地区,尚无有效的治疗药物和预防疫苗。目前MERS疫苗开发的难点主要在于MERS-CoV感染后在人体诱导的免疫应答规律尚不清楚。8月4日,广州医科大学呼吸疾病国家重点实验室赵金存教授团队与美国爱荷华大学Stanley Perlman博士以及沙特阿拉伯利雅得费萨尔国王专科医院和研究中心的Abeer N. Alshukairi博士合作,在Science Immunology杂志上发表了题为“Recovery from the Middle East respiratory syndrome is associated with antibody and T-cell responses”的重要研究成果,首次阐明中东呼吸综合征冠状病毒感染人体后诱导特异性T细胞免疫应答特征,填补了MERS研究领域空白。更为重要的是该研究鉴定出多个人类MERS-CoV特异性T细胞表位,可以作为人类疫苗设计的靶点。此外,利用本研究成果不但可以协助预测感染病人的预后,发现漏诊病人,还可协助后期抗MERS疫苗设计及疫苗效率的监测。

论文解读

MERS-CoV是一种新型冠状病毒,2012年首发于沙特,2013年被世界卫生组织(WHO)正式命名为中东呼吸综合征冠状病毒(MERS-CoV)。截止2017年8月,共感染2040人,712人死亡,病死率近35%,目前疫情仍处于流行状态。2015年4-5月间,MERS-CoV输入性传入韩国,由于防控不力,在韩国爆发性流行,共隔离逾16000人,其中确认感染186人,死亡36人,造成严重的社会恐慌和国民经济损失。期间有一病例由韩国输入性传入我国,后经国家疾控中心确诊并进行全基因组测序,确认为中国首例输入性MERS-CoV 病例。

日前,据呼吸疾病国家重点实验室网站介绍,赵金存团队与广东出入境检验检疫局技术中心(国家生物安全检测重点实验室)合作,成功分离中国首例中东呼吸综合征冠状病毒(MERS-CoV)毒株ChinaGD01,并通过RT-PCR(图A、免疫荧光、全基因组测序等方法进行了验证,确定分离成功。此外团队成员还对毒株进行了空斑纯化和滴度确定初步了解病毒特性。

毒株的分离对病毒学监测,及时发现病毒的基因特性、抗原性、致病性和耐药性变异和制订该病毒大流行的应对策略、调整防控措施具有重要意义。因此,我国首例MERS病人MERS-CoV毒株ChinaGD01的分离将进一步促进我国MERS-CoV研究,并为MERS疫情防控提供关键技术材料支撑。
由于机体在病毒感染后主要通过天然免疫应答和获得性免疫应答发挥抗病毒作用,且病毒特异性抗体和T细胞为获得性免疫应答最重要的两个主要组分,然而目前MERS疫苗开发的难点主要在于MERS-CoV感染后在人体诱导的免疫应答规律尚不清楚。

在这项研究中,研究人员前期大部分研究主要采用血清学的方法来监测MERS-CoV在人群中的流行以及病人体内抗病毒抗体水平,然而近期研究发现MERS-CoV感染后,病人的抗体应答持续时间很短,且水平很低。赵金存团队及其合作者利用MERS病人外周血单个核细胞样本,在国际上首次报道了MERS-CoV感染后,在病人体内诱导产生了抗病毒T细胞应答。并发现MERS-CoV特异性CD8+T细胞应答可以在大多数低抗体水平的病人体内被检测到;进一步研究发现MERS病人体内抗体和T细胞应答水平与疾病严重程度相关;更为重要的是此研究鉴定出多个人类MERS-CoV特异性T细胞表位,可以作为人类疫苗设计的靶点。利用本研究成果不但可以协助预测感染病人的预后,发现漏诊病人,还可协助后期抗MERS疫苗设计及疫苗效率的监测。

据悉,这篇论文还将作为封面论文正式刊出。

Science Immunology杂志为Science近期推出的高水平免疫学期刊(月刊),2016年7月正式上线,其定位大概与Cell旗下的Immunity和Nature旗下的Nature Immunology杂志相伯仲。据了解,赵金存教授团队的这篇论文是国内在Science Immunology杂志上发表的第一篇研究论文。

原始出处:
Zhao J, Alshukairi AN, Baharoon SA, et al.Recovery from the Middle East respiratory syndrome is associated with antibody and T-cell responses.Sci Immunol. 2017 Aug 4;2(14). pii: eaan5393. doi: 10.1126/sciimmunol.aan5393. Epub 2017 Aug 4.

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    2017-08-08 130****4638

    学习了谢谢分享

    0

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    2017-08-07 qingfengqishi5

    学习了,学习了

    0

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