Microbiome:金黄色葡萄球菌产物引发自身性免疫

2019-04-08 佚名 生物通

南卡罗莱纳的研究人员在《Microbiome》报告,接受抗逆转录病毒治疗的HIV阳性患者的自身抗体生产与血液中葡萄球菌产物水平有关。

南卡罗莱纳的研究人员在《Microbiome》报告,接受抗逆转录病毒治疗的HIV阳性患者的自身抗体生产与血液中葡萄球菌产物水平有关。

人类免疫缺陷病毒(HIV)攻击免疫系统,使人更容易受到感染。当HIV患者接受抗逆转录病毒治疗(ART)时,他们的免疫系统可以恢复,但其中有一些会产生自毁性蛋白质或自身抗体。

一些自身抗体不攻击细菌或病毒等外来入侵物,专门攻击人体自己的细胞。这被称为自身免疫。我们人体都可以产生低水平的自身抗体,然而,当它们持续高水平产生时,身体就受不了了。

南卡罗莱纳医科大学微生物学和免疫学副教授Wei Jiang博士和她的团队在《Microbiome》一篇文章中报告说,经ART的高水平自身抗体患者血液中细菌(金黄色葡萄球菌)产物含量也有所增加。

比较HIV阳性患者和接种流感疫苗的健康人前后一周和两周的血液样本的自身抗体阵列,HIV阳性患者的自身免疫反应与血液中存在的金黄色葡萄球菌产物有关。这种细菌是导致皮肤葡萄球菌感染的罪魁祸首。一些HIV阳性患者体内这些细菌产物的基线水平较高。

研究小组还检测了其他细菌株,但只有金黄色葡萄球菌与HIV阳性患者的自身抗体产生有关。

“肠漏”可以解释HIV阳性患者血液中葡萄球菌产物增加

“肠漏”患者的肠壁非常弱,肠道中的细菌和有毒物质可以进入血液,在血液中这些物质很容易受到免疫系统攻击。免疫系统对这些细菌的攻击也会损害人体组织。“肠漏”与持续性炎症和一些慢性疾病有关,包括AIDS、肠易激综合征、腹腔疾病和I型糖尿病

为了验证他们的发现,Jing团队将灭活的葡萄球菌注射到健康小鼠体内,发现它们确实刺激了自身抗体的产生。

“我们用动物来验证在人类身上发生的东西,”Jiang解释。“葡萄球菌产物水平与HIV患者自身抗体的产生有关,我们假设这些细菌诱导了自身抗体,所以我们在小鼠身上做了测试。”

在动物模型身上进一步探索临床发现对本研究至关重要。“我们现在正在研究哪些葡萄球菌产物对小鼠自身抗体产生有激活性,”Jiang说。“以此来设计一种抑制剂阻止这些细菌激活免疫细胞。”

展望未来,Jiang和她的团队希望设计一种抑制葡萄球菌的药物,以帮助预防接受ART的HIV阳性患者产生自身性免疫。

原始出处:Luo Z, Li M, Wu Y, et al. Systemic translocation of Staphylococcus drives autoantibody production in HIV disease.. Microbiome. 2019 Feb 14;7(1):25.

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    2019-10-19 sunylz
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    2019-05-20 pyaili
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