MedRxiv:SARS病毒抗体可长期存在

2020-02-17 生物技术君 中国生物技术网

2月15日,发表在预印本网站medRxiv(未经同行评议)的一篇论文中,来自中山大学公共卫生学院陆家海团队发表了相关研究。


图片来源:NIAID

截止到今天,新型冠状肺炎病毒(SARS-CoV-2)已导致全国的确诊病例突破七万人。鉴于SARS-CoV-2与17年前的SARS冠状病毒(SARS-CoV)具有高度相似性。因此,有关SARS-CoV的信息对当前疫情的防控也是颇具价值的。

2月15日,发表在预印本网站medRxiv(未经同行评议)的一篇论文中,来自中山大学公共卫生学院陆家海团队发表了相关研究。

2002年,SARS首次在中国广东爆发,随后演变成大流行,并迅速蔓延到31个国家和地区,造成全球性恐慌和公共卫生危机。据世界卫生组织公布的数据,SARS总病例数为8422例,病死率为10.88% (916/8422)。广东省是受影响最严重的省份之一,共报告1511例,其中22.90%(346/1511)发生在医护人员中。他们在疫情爆发的早期阶段治疗和护理SARS患者时感染了病毒。在疫情爆发的后期,虽然加强了预防感染预防措施,但仍有医护人员感染。

SARS-CoV最初于2003年被确认为通过从小型食肉动物(如果子狸)向人类进行跨物种传播而发生的。最近的研究表明,SARS-CoV可能起源于蝙蝠。蝙蝠冠状病毒分离株已被证明能够识别人类和蝙蝠的ACE2受体。冠状病毒可以利用许多细胞受体,并可能导致各种疾病,如呼吸道和肠道疾病。特别是Spike蛋白是病毒与受体相互作用、跨物种传播和宿主趋向性的重要决定因素,其突变可以促进跨物种到人际间传播。2012年,中东地区出现了中东呼吸综合征冠状病毒(MERS-CoV)。MERS-CoV已被证明可从骆驼传染给人类,这突显了SARS-CoV或SARS样冠状病毒构成的持续威胁。

SARS-CoV IgG抗体具有中和活性并提供免受感染的保护。抗病毒和核衣壳蛋白IgG抗体的存在代表保护性免疫反应。虽然以前的一些研究报道了长达5年的SARS IgG抗体的纵向变化,但在更长的时间内对体液免疫反应缺乏了解。

在本研究中,该团队对一组当年感染SARS-CoV的医护人员进行了13年的随访研究,以分析抗SARS-CoV抗体的存在和持久性。研究人员共收集了血清样本362份,包括2003年入院时从所有研究参与者那里收集的样本,以及参与者参加年度体检时(2004年4月至6月至2015年)每年收集的样本。此外,2015年从95例SARS病例中收集了另外20名受试者的血清样本,还从同一家医院选取40名未感染SARS的医护人员作为对照组,并采集血清样本,验证34名被SARS-CoV感染的医护队列在2015年的最终结果数据。



研究人员使用完整病毒和SARS-CoV重组核衣壳蛋白作为诊断抗原,通过ELISA对所有血清进行IgG抗体测试。

结果发现:抗SARS-CoV的IgG可持续长达12年以上。IgG滴度通常在2004年达到峰值,在2004-2006年间迅速下降,然后继续以较慢的速度下降。直到2015年前,感染SARS-CoV的医护人员的IgG效价一直保持在明显较高的水平。在感染时接受皮质类固醇治疗患者的IgG低于未感染者。

研究通讯作者、中山大学公共卫生学院教授陆家海说:“这也就是说,激素的大剂量使用或长期使用可能会影响患者的免疫系统,导致免疫力的下降。”

根据以上结果,该团队得出结论:SARS-CoV IgG抗体可持续至少12年,并且可能对SARS-CoV及其他β冠状病毒具有保护作用。这项研究为SARS-CoV和SARS-CoV-2的体液免疫反应提供了有价值的信息。

陆家海说:“因为SARS-CoV-2和SARS-CoV同属于冠状病毒,如果针对SARS-CoV-2的疫苗研制成功,其免疫保护作用也可能持续10年以上。同时,我们猜测SARS-CoV的抗体对SARS-CoV-2存在交叉保护作用,这还需要进一步研究证实。”

原始出处:
Xiaoqin Guo, et al. Long-Term Persistence of IgG Antibodies in SARS-CoV Infected Healthcare Workers. MedRxiv. Posted February 14, 2020.

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    2020-02-19 小刀医生
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    2020-02-17 天地飞扬

    学习了,谢谢分享!

    0

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    2020-02-17 1209e435m98(暂无昵称)

    学习了,谢谢分享

    0

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