Internalization and degradation of anti-CD4 monoclonal antibodies bound to human peripheral blood lymphocytes

内化 单克隆抗体 外周血 降级(电信) 抗体 单克隆 免疫学 化学 病毒学 生物 受体 计算机科学 生物化学 电信
作者
P Morel,Claude Vincent,John Wijdenes,Jean‐Pierre Revillard
出处
期刊:Molecular Immunology [Elsevier]
卷期号:30 (7): 649-657 被引量:12
标识
DOI:10.1016/0161-5890(93)90076-n
摘要

Treatment of patients with anti-CD4 mAbs induces both functional alterations of CD4+ cells and depletion of circulating CD4+ lymphocytes. Some of these effects depend on the amount of mAb molecules bound per CD4+ cell and on the properties of the Fc part of the mAb (isotype specificity). We have investigated the fate of anti-CD4 monoclonal antibodies (mAbs) after their interaction with CD4 protein on the surface of peripheral blood lymphocytes (PBL). We used seven anti-CD4 mAbs whose epitope specificity, equilibrium constant and kinetics of binding are reported. Lymphocytes were saturated with anti-CD4 mAbs either at +4 degrees C or 37 degrees C then washed and incubated in antibody-free medium. At different time intervals cells were processed for analysis. By indirect immunofluorescence, it was shown that the amount of surface-bound mAb decreased rapidly when cells were incubated at 37 degrees C, but not at 4 degrees C. With 125I-mAbs, we demonstrate that there was a rapid internalization of the molecules followed by the re-expression on the cell surface of a part of initially bound mAbs and by the release of partially degraded antibody in the cell supernatant. In the presence of sodium azide (10 mM) only a slow dissociation of intact antibody occurred, without internalization. The radioactive material eluted in the 100-200 kDa zone from supernatants was only partly adsorbed on protein A and hardly on CD4+ cells, indicating that alterations of the Fc region and loss of antigen binding activity, possibly by formation of CD4-anti-CD4 complexes, had occurred during the process of internalization and release into the extracellular medium. These data may be important to consider for adjusting the dosage of anti-CD4 mAbs to be administered.

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