Engineered B cells expressing an anti-HIV antibody enable memory retention, isotype switching and clonal expansion.

Engineered B cells expressing an anti-HIV antibody enable memory retention, isotype switching and clonal expansion.
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DOI:
10.1038/s41467-020-19649-1
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发表时间:
2020-11-17
影响因子:
16.6
通讯作者:
Barzel A
Barzel A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Nahmad AD;Raviv Y;Horovitz-Fried M;Sofer I;Akriv T;Nataf D;Dotan I;Carmi Y;Burstein D;Wine Y;Benhar I;Barzel A

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HIV病毒血症可以通过长期抗逆转录病毒治疗来控制。作为一种潜在的单次替代方案,通过 CRISPR/Cas9 改造的 B 细胞表达抗 HIV 广泛中和抗体 (bNAb),能够分泌高滴度的抗体。在这里,我们证明,在对小鼠进行免疫接种后,工程化 B 细胞会过继转移回生发中心 (GC),在那里它们在内源性反应中占主导地位,并在经历类别转换重组 (CSR) 的同时分化为记忆细胞和浆细胞。使用高亲和力抗原进行免疫可增加 GC 积累和 CSR 率。加强免疫增加了 GC 中工程 B 细胞的比率和抗体分泌,表明记忆保留。最后,脾脏中工程化 B 细胞的抗体序列显示了克隆选择的模式。因此,B 细胞可以被设计成一种活的、不断进化的药物。长期抗逆转录病毒治疗并不能根除艾滋病毒感染。在这里,作者描述了一种潜在的一次性替代方案,即通过改造 B 细胞来表达抗 HIV 抗体并进行记忆保留、同种型转换和克隆扩增
HIV viremia can be controlled by chronic antiretroviral therapy. As a potentially single-shot alternative, B cells engineered by CRISPR/Cas9 to express anti-HIV broadly neutralizing antibodies (bNAbs) are capable of secreting high antibody titers. Here, we show that, upon immunization of mice, adoptively transferred engineered B cells home to germinal centers (GC) where they predominate over the endogenous response and differentiate into memory and plasma cells while undergoing class switch recombination (CSR). Immunization with a high affinity antigen increases accumulation in GCs and CSR rates. Boost immunization increases the rate of engineered B cells in GCs and antibody secretion, indicating memory retention. Finally, antibody sequences of engineered B cells in the spleen show patterns of clonal selection. Therefore, B cells can be engineered into what could be a living and evolving drug. Chronic antiretroviral therapy does not eradicate HIV infection. Here, the authors describe a potentially one-shot alternative by engineering B cells to express anti-HIV antibodies and undergo memory retention, isotype switching and clonal expansion
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