Production and Characterization of High-Affinity Human Monoclonal Antibodies to Human Immunodeficiency Virus Type 1 Envelope Glycoproteins in a Mouse Model Expressing Human Immunoglobulins

Production and Characterization of High-Affinity Human Monoclonal Antibodies to Human Immunodeficiency Virus Type 1 Envelope Glycoproteins in a Mouse Model Expressing Human Immunoglobulins
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在表达人免疫球蛋白的小鼠模型中针对人免疫缺陷病毒 1 型包膜糖蛋白的高亲和力人单克隆抗体的产生和表征

DOI:
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发表时间:
2006
影响因子:
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通讯作者:
Q. Sattentau
Q. Sattentau
中科院分区:
生物3区
文献类型:
--
作者:
N. Sheppard;S. Davies;S. Jeffs;Sueli M. Vieira;Q. Sattentau

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摘要针对人类免疫缺陷病毒1型(HIV-1)包膜糖蛋白(Env)的人(Hu)单克隆抗体(MAb)是Env结构和功能分析的有用工具,正在开发中,可作为潜在的预防和治疗方法已确定的HIV-1感染,并在指导预防性疫苗的设计方面发挥关键作用。尽管占全球感染的50%以上,但在任何物种中都没有产生针对C进化枝HIV-1 Env的MAb。为了产生针对新的中国C进化枝Env疫苗候选物(初级分离株HIV-197 CN 54)的HuMAb,我们使用表达人免疫球蛋白(IG)M抗体库的BAB 5小鼠代替内源性鼠免疫球蛋白。当用HIV-197 CN 54 Env免疫时,这些小鼠产生抗原特异性IgM抗体。使用来自这些小鼠的脾细胞的杂交瘤融合使得能够分离两种Env特异性IgM HuMAb:N3 C5和N 03 B11。N3 C5结合来自进化枝A和C的HIV-1 Env,而N 03 B11结合两个地理上遥远的进化枝C分离株,但不结合来自其他进化枝的Env。这些HuMAb结合gp 41胞外域的免疫显性区域内的构象表位。N3 C5在不存在补体的情况下弱中和自体分离物,并且在存在补体的情况下弱增强感染。N 03 B11在存在或不存在补体的情况下对感染性均无影响。这些新的HuMAb是用于研究与全球大流行相关的HIV-1 Env的有用试剂,并且产生人免疫球蛋白的小鼠提供了用于产生此类抗体的工具。
ABSTRACT Human (Hu) monoclonal antibodies (MAbs) against the human immunodeficiency virus type 1 (HIV-1) envelope glycoproteins (Env) are useful tools in the structural and functional analysis of Env, are under development both as potential prophylaxis and as therapy for established HIV-1 infection, and have crucial roles in guiding the design of preventative vaccines. Despite representing more than 50% of infections globally, no MAbs have been generated in any species against C clade HIV-1 Env. To generate HuMAbs to a novel Chinese C clade Env vaccine candidate (primary isolate strain HIV-197CN54), we used BAB5 mice that express a human immunoglobulin (Ig) M antibody repertoire in place of endogenous murine immunoglobulins. When immunized with HIV-197CN54 Env, these mice developed antigen-specific IgM antibodies. Hybridoma fusions using splenocytes from these mice enabled the isolation of two Env-specific IgM HuMAbs: N3C5 and N03B11. N3C5 bound to HIV-1 Env from clades A and C, whereas N03B11 bound two geographically distant clade C isolates but not Env from other clades. These HuMAbs bind conformational epitopes within the immunodominant region of the gp41 ectodomain. N3C5 weakly neutralized the autologous isolate in the absence of complement and weakly enhanced infection in the presence of complement. N03B11 has no effect on infectivity in either the presence or the absence of complement. These novel HuMAbs are useful reagents for the study of HIV-1 Env relevant to the global pandemic, and mice producing human immunoglobulin present a tool for the production of such antibodies.
HIV-1 感染的补体介导的抗体依赖性增强需要 CD4 和补体受体。
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