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A novel blocking monoclonal antibody recognizing a distinct epitope of human CD40 molecule.

Authors
  • Zhuang, Y
  • Huang, J
  • Zhou, Z
  • Ge, Y
  • Fan, Y
  • Qi, C
  • Zhen, L
  • Monchatre, E
  • Edelman, L
  • Zhang, X
Type
Published Article
Journal
Tissue antigens
Publication Date
Jan 01, 2005
Volume
65
Issue
1
Pages
81–87
Identifiers
PMID: 15663744
Source
Medline
License
Unknown

Abstract

CD40, a member of the tumor necrosis factor receptor superfamily, is an important costimulatory molecule during the immune response. Here, we report a blocking mouse antihuman CD40 monoclonal antibody, mAb 3G3, of which the specificity was verified by flow cytometry and Western blot. It was shown by competition test that 3G3 bound to a different site (epitope) of CD40 from the reported CD40 mAbs, including clone mAb89, 3B2, and 5C11. It was also found that mAb 3G3 could inhibit homotypic aggregation of Daudi cells induced by the agonistic anti-CD40 mAb 5C11. Furthermore, mAb 3G3 effectively inhibited the proliferation of peripheral blood mononuclear cells in mixed lymphocyte reaction assay. Finally, a sensitive and specific soluble CD40 (sCD40) ELISA kit was established by matching mAb 3G3 with 5C11, and it was found that the levels of sCD40 in sera from patients with immune disorders such as hyperthyroidism, chronic nephritis, and rheumatoid arthritis were obviously higher than those from normal individuals. Thus, this blocking anti-CD40 mAb provides a novel tool for the study of CD40.

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