Abstract
Therapeutic antibodies frequently cause side effects by binding antigen in non-target tissues. Here we demonstrate a novel molecular design of antibodies that addresses this problem by reversibly "masking" antibody complementarity determining regions until they reach diseased tissues containing disease-associated proteases. Specifically, two distinct single-chain Fv (scFv) fragments derived from antibodies against the epidermal growth factor receptor (cetuximab and 425) were fused a protease susceptible linker to their epitopes, which were engineered to encourage intermolecular association. Surface plasmon resonance and flow cytometry were used to confirm that the masked complex poorly interacts with native antigen, whereas protease treatment restores antigen recognition. Minimally, the "masked" scFvs possesses an eight-fold lower association with the epitope compared with the individual scFvs unmasked by proteolytic cleavage. This molecular design may have general utility for targeted release of therapeutic antibodies at disease sites.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Antibodies, Monoclonal / administration & dosage
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Antibodies, Monoclonal / chemistry*
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Antibodies, Monoclonal / immunology
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Antibodies, Monoclonal, Humanized
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Antibody Affinity*
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Cell Line, Tumor
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Cetuximab
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Complementarity Determining Regions / chemistry
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Cross-Linking Reagents / chemistry*
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Cross-Linking Reagents / metabolism
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Dimerization
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Drug Delivery Systems
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Drug Design*
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Drug Synergism
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Epitopes / genetics
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Epitopes / immunology
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ErbB Receptors / antagonists & inhibitors
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ErbB Receptors / genetics
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ErbB Receptors / immunology*
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Humans
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Hydrolysis
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Matrix Metalloproteinase 9 / metabolism*
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Neoplasm Proteins / antagonists & inhibitors
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Neoplasm Proteins / immunology
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Neoplasm Proteins / metabolism
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Oligopeptides / chemistry*
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Oligopeptides / metabolism
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Point Mutation
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Prodrugs / administration & dosage
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Prodrugs / chemistry*
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Protein Structure, Tertiary
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Recombinant Fusion Proteins / administration & dosage
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Recombinant Fusion Proteins / chemistry*
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Recombinant Fusion Proteins / immunology
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Single-Chain Antibodies / administration & dosage
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Single-Chain Antibodies / chemistry*
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Single-Chain Antibodies / immunology
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Substrate Specificity
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Surface Plasmon Resonance
Substances
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425(scFv)-ETA'
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Antibodies, Monoclonal
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Antibodies, Monoclonal, Humanized
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Complementarity Determining Regions
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Cross-Linking Reagents
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Epitopes
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Neoplasm Proteins
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Oligopeptides
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Prodrugs
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Recombinant Fusion Proteins
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Single-Chain Antibodies
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EGFR protein, human
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ErbB Receptors
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Matrix Metalloproteinase 9
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Cetuximab