防变异的高亲和度ACE2抗剂限制了SARS-CoV-2在上下呼吸道的复制
Matthew Gagne1, Barbara J Flynn1, Christopher Cole Honeycutt1
1Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
Nature communications
|August 12, 2024
概括
一种新型蛋白质,RBD-62,有效地抑制了的SARS-CoV-2Delta变体复制. 这种变异无关的治疗剂在不妨碍免疫反应的情况下预防了严重的疾病,这为对抗不断演变的病毒提供了有希望的方法.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 生物医学工程 生物医学工程
背景情况:
- 严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 迅速演变,发展出对疫苗,先前感染免疫力和抗病毒药物产生抵抗力的突变.
- 新的SARS-CoV-2变种的出现需要开发无变种的治疗剂,这些治疗剂可以维持对各种病毒菌株的有效性,并避免施加选择性压力.
- 一种可以预防严重疾病的治疗药物,而不会促进病毒耐药性,将是管理正在进行的流行病的重大进展.
研究的目的:
- 为了评估气溶液RBD-62的疗效,这种蛋白质是为加强与SARS-CoV-2受体结合域 (RBD) 的结合而设计的,用于预防由Delta变种引起的严重疾病.
- 评估RBD-62治疗是否影响病毒特异性T细胞和B细胞反应的发展或引起抗药免疫力.
- 证明RBD-62的概念验证,作为对高毒性SARS-CoV-2变种的潜在治疗干预.
主要方法:
- 雄性 rhesus 被挑战了 SARS-CoV-2 德尔塔变种,一种高度致病性菌株.
- 在挑战时,被用气溶RBD-62治疗,这种蛋白质与野生类型RBD相比,具有1000倍增强的ACE2结合亲和力.
- 病毒复制在上空气道和下空气道中进行了评估,并监测了特定于病毒的T细胞和B细胞反应. 还评估了抗药性免疫力.
主要成果:
- 透气RBD-62治疗有效地抑制了SARS-CoV-2Delta变体在的上空和下空气道中的复制.
- 观察到这种病毒复制的抑制在两个通气道区内都是相当的,这是以前未经临床批准的疫苗记录的发现.
- 重要的是,RBD-62治疗没有阻碍病毒特异性T细胞和B细胞反应的发展,也没有诱导治疗动物的抗药性免疫力.
结论:
- RBD-62显示出作为一种针对SARS-CoV-2的无变异治疗剂的显著潜力.
- 在不影响宿主免疫反应或诱导药物耐药性的情况下,RBD-62抑制复制的能力是一个关键优势.
- 这些发现提供了强有力的临床前证据,支持开发RBD-62以预防严重的COVID-19,即使面对新兴的病毒变种.
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