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Cell Che Biol:艾滋病可以说是有救了,科学实验显示出希望

2017-10-28 佚名 medicalxpress

马里兰大学(UniversityofMaryland)和杜克大学(DukeUniversity)的研究人员设计了一种新型的蛋白质-糖疫苗候选疫苗,在一种动物模型中,它刺激了免疫系统对HIV病毒的免疫反应。有朝一日,这种分子可能成为成功的艾滋病疫苗的一部分。

马里兰大学(UniversityofMaryland)和杜克大学(DukeUniversity)的研究人员设计了一种新型的蛋白质-糖疫苗候选疫苗,在一种动物模型中,它刺激了免疫系统对HIV病毒的免疫反应。有朝一日,这种分子可能成为成功的艾滋病疫苗的一部分。

UMD化学与生物化学教授王丽喜说:“创造有效的艾滋病毒疫苗的障碍是使免疫系统难以产生针对多种艾滋病毒毒素的糖盾的抗体。“我们的方法通过设计一种模拟蛋白质糖部分的疫苗组件来解决这个问题。”

王教授和合作者设计了一种疫苗候选疫苗,使用的是与糖基有关的HIV蛋白片段。当注射到兔子体内时,疫苗的候选抗体在四种不同的HIV病毒株中刺激了抗体对糖盾的反应。研究结果于2017年10月26日发表在《细胞化学生物学》杂志上。

候选疫苗的蛋白质片段来自gp120,它是一种蛋白质,可以像保护的信封一样覆盖艾滋病毒。糖盾覆盖了gp120的外壳,增强了艾滋病毒的防御能力。在没有药物治疗的情况下,感染hiv病毒的极少数人通常有攻击gp120的抗体。

研究人员试图制造一种针对gp120的艾滋病毒疫苗,但由于两个原因而收效甚微。首先,糖盾上的HIV类似于人体中发现的糖,因此不会刺激强烈的免疫反应。第二,有60多种HIV病毒存在,而且病毒经常变异。因此,从一种HIV病毒株体内对抗gp120的抗体将不能保护其他菌株或突变株。

为了克服这些挑战,王教授和他的合作者们专注于在HIV病毒株中常见的一小部分gp120蛋白质。研究人员使用了一种合成化学方法,他们之前开发的一种方法是将gp120片段与一种糖分子结合在一起,这种糖分子也在艾滋病毒株中共享,以模仿HIV包膜上的糖盾。

接下来,研究人员将蛋白-糖疫苗的候选对象注射到兔子体内,并发现兔子的免疫系统产生了抗体,这些抗体与gp120在今天的血液循环中发现的四种主要的HIV病毒有一定的联系。在没有糖组的情况下,用含有蛋白质片段的疫苗注射兔子,抗体主要从一个HIV病毒株中得到gp120的抗体。

王教授说:“这一结果很重要,因为产生直接攻击防御性糖盾的抗体是对目标免疫的重要一步,因此是开发真正有效疫苗的第一步。”

尽管这些兔子的抗体与gp120结合在一起,但它们并没有阻止艾滋病毒感染细胞。这一结果并不让王教授感到惊讶,他指出,人类通常需要长达两年的时间才能对HIV病毒建立免疫系统,而动物实验只持续了两个月。

“我们还没有使出全部的手段,”王教授说。“但是,在仅仅两个月的时间里,候选疫苗就能在糖盾上产生大量抗体,这是令人鼓舞的。”其他的研究也花了4年时间来达到类似的结果。这意味着我们的分子是一个相对较强的免疫反应的诱导物。

研究人员的后续步骤将是与其他疫苗候选者结合进行长期研究,了解抗体与gp120的哪些区域相关,并确定如何增加抗体在中和HIV方面的有效性。

原始出处:

Hui Cai, Jared Orwenyo, John P. Giddens, et.al. Synthetic Three-Component HIV-1 V3 Glycopeptide Immunogens Induce Glycan-Dependent Antibody Responses. Cell Chemical Biology

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    2017-12-01 维他命
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    2018-03-12 sunylz
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    2017-11-06 虈亣靌

    学习一下谢谢分享

    0

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    2017-10-30 lucycici

    很好的研究

    0

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    2017-10-29 虈亣靌

    优质资源.共同学习

    0

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    2017-10-28 1dd8c52fm63(暂无匿称)

    学习学习.了解了解

    0

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