赫克逊基马基腺病毒血清型5载体绕过了先前存在的抗载体免疫力
Diane M Roberts1, Anjali Nanda, Menzo J E Havenga
1Division of Viral Pathogenesis, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
Nature
|April 21, 2006
概括
工程化腺病毒载体克服了先前存在的免疫力. 基因载体具有改变的表面蛋白质逃避中和抗体,使得有效的基因治疗和疫苗接种.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 基因治疗 基因治疗
背景情况:
- 病毒免疫逃避通常涉及突变的表面蛋白质以避免抗体.
- 腺病毒血清型5 (Ad5) 载体对疫苗有希望,但面临着先前存在的免疫挑战.
- 新型病毒基因传递载体需要规避抗载体免疫力的策略.
研究的目的:
- 为了设计复合的Ad5载体来规避先前存在的抗Ad5免疫力.
- 调查六合体高变区 (HVRs) 在Ad5免疫性和中和中的作用.
- 证明虚构病毒载体的潜力,以改善疫苗接种和基因治疗.
主要方法:
- 通过将Ad5 六边形HVRs与Ad48.8的HVRs替换成构造的rAd5虚拟向量.
- 在原始和前免疫动物模型中评估了载体的产生,稳定性和免疫性.
- 评估了先前存在的抗Ad5免疫对仿真载体免疫性的影响.
主要成果:
- 化学HVR-rAd5载体在高位数产生,并且稳定.
- 在原始动物中,化学载体显示出与父母rAd5相比的免疫性.
- 化学载体在具有先前存在的抗Ad5免疫力的情况下保持了免疫性,而不是父母载体.
- 数据表明,中和抗体在Ad5六子HVR中的标表位.
结论:
- 再组合病毒载体可以通过修改表面囊蛋白来设计绕过先前存在的抗载体免疫力.
- 化学Ad5载体与改变的六子HVR有效地绕过Ad5特异性中和抗体.
- 这一战略对在不同的人群中开发有效的疫苗和基因疗法具有重大前景.
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