One of the major obstacles in the successful clinical application of monoclonal antibodies has been the development of host immune responses to murine Ig constant and variable regions. While the CDR grafting of MAbs may alleviate many of these problems, the potential remains that one or more murine CDRs on the human Ig backbone of a "humanized" MAb may still be immunogenic. Studies were undertaken employing a MAb of potential clinical utility, CC49, to define those CDRs that are essential for antigen binding and those that may be immunogenic in humans. We previously developed a humanized CC49 (HuCC49) by grafting the MAb CC49 hypervariable regions onto frameworks of human MAbs. To identify those CDRs essential for binding, a panel of variant HuCC49 MAbs was generated here by systematically replacing each of the murine CDRs with their human counterparts. The relative affinity constant of each variant was determined. Serum from a patient who received murine CC49 was used to determine the potential immunogenicity of each CDR in humans. The serum was shown to react with the anti-CC49 variable region. Results showed that patients' anti-idiotypic responses are directed mainly against LCDR3 and moderately against LCDR1 and HCDR2. These studies demonstrate for the first time that variants containing individual CDR substitutions of a humanized MAb can be constructed, and each CDR can be defined for the two most important properties for potential clinical utility: antigen binding and immunogenicity. Published by Elsevier Science Ltd.

Iwahashi, M., Milenic, D.e., Padlan, E.a., Bei, R., Schlom, J., Kashmiri, S.v. (1999). CDR substitutions of a humanized monoclonal antibody (CC49): contributions of individual CDRs to antigen binding and immunogenicity. MOLECULAR IMMUNOLOGY, 36(15-16), 1079-1091 [10.1016/s0161-5890(99)00094-2].

CDR substitutions of a humanized monoclonal antibody (CC49): contributions of individual CDRs to antigen binding and immunogenicity

Bei, R;
1999

Abstract

One of the major obstacles in the successful clinical application of monoclonal antibodies has been the development of host immune responses to murine Ig constant and variable regions. While the CDR grafting of MAbs may alleviate many of these problems, the potential remains that one or more murine CDRs on the human Ig backbone of a "humanized" MAb may still be immunogenic. Studies were undertaken employing a MAb of potential clinical utility, CC49, to define those CDRs that are essential for antigen binding and those that may be immunogenic in humans. We previously developed a humanized CC49 (HuCC49) by grafting the MAb CC49 hypervariable regions onto frameworks of human MAbs. To identify those CDRs essential for binding, a panel of variant HuCC49 MAbs was generated here by systematically replacing each of the murine CDRs with their human counterparts. The relative affinity constant of each variant was determined. Serum from a patient who received murine CC49 was used to determine the potential immunogenicity of each CDR in humans. The serum was shown to react with the anti-CC49 variable region. Results showed that patients' anti-idiotypic responses are directed mainly against LCDR3 and moderately against LCDR1 and HCDR2. These studies demonstrate for the first time that variants containing individual CDR substitutions of a humanized MAb can be constructed, and each CDR can be defined for the two most important properties for potential clinical utility: antigen binding and immunogenicity. Published by Elsevier Science Ltd.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore MED/04
English
Con Impact Factor ISI
antigen binding
tumor immunity
anti-idiotypic antibodies
immunochemistry
Amino Acid Sequence
Amino Acid Substitution
Animals
Antibodies, Anti-Idiotypic
Antibodies, Monoclonal
Antibody Affinity
Antigen-Antibody Reactions
Baculoviridae
Binding Sites
Binding, Competitive
Cell Line
Humans
Immunoglobulin Variable Region
Kinetics
Mice
Molecular Sequence Data
Recombinant Proteins
Spodoptera
Iwahashi, M., Milenic, D.e., Padlan, E.a., Bei, R., Schlom, J., Kashmiri, S.v. (1999). CDR substitutions of a humanized monoclonal antibody (CC49): contributions of individual CDRs to antigen binding and immunogenicity. MOLECULAR IMMUNOLOGY, 36(15-16), 1079-1091 [10.1016/s0161-5890(99)00094-2].
Iwahashi, M; Milenic, De; Padlan, Ea; Bei, R; Schlom, J; Kashmiri, Sv
Articolo su rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/279815
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