Chimeric and humanized antibodies with specificity for the CD33 antigen

Man Sung Co, Nevenka M. Avdalovic, Philip C. Caron, Mark V Avdalovic, David A. Scheinberg, Cary Queen

Research output: Contribution to journalArticlepeer-review

128 Scopus citations


L and H chain cDNAs of M195, a murine mAb that binds to the CD33 Ag on normal and leukemic myeloid cells, were cloned. The cDNAs were used in the construction of mouse/human IgG1 and IgG3 chimeric antibodies. In addition, humanized antibodies were constructed which combined the complementarity-determining regions of the M195 antibody with human framework and constant regions. The human framework was chosen to maximize homology with the M195 V domain sequence. Moreover, a computer model of M195 was used to identify several framework amino acids that are likely to interact with the complementarity-determining regions, and these residues were also retained in the humanized antibodies. Unexpectedly, the humanized IgG1 and IgG3 M195 antibodies, which have reshaped V regions, have higher apparent binding affinity for the CD33 Ag than the chimeric or mouse antibodies.

Original languageEnglish (US)
Pages (from-to)1149-1154
Number of pages6
JournalJournal of Immunology
Issue number4
StatePublished - Feb 15 1992
Externally publishedYes

ASJC Scopus subject areas

  • Immunology


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