title: A novel synthetic naïve human antibody library allows the isolation of antibodies against a new epitope of oncofetal fibronectin.
abstract: Human monoclonal antibodies (mAbs) can routinely be isolated from phage display libraries against virtually any protein available in sufficient purity and quantity, but library design can influence epitope coverage on the target antigen. Here we describe the construction of a novel synthetic human antibody phage display library that incorporates hydrophilic or charged residues at position 52 of the CDR2 loop of the variable heavy chain domain, instead of the serine residue found in the corresponding germline gene. The novel library was used to isolate human mAbs to various antigens, including the alternatively-spliced EDA domain of fibronectin, a marker of tumor angiogenesis. In particular, the mAb 2H7 was proven to bind to a novel epitope on EDA, which does not overlap with the one recognized by the clinical-stage F8 antibody. F8 and 2H7 were used for the construction of chelating recombinant antibodies (CRAbs), whose tumor-targeting properties were assessed in vivo in biodistribution studies in mice bearing F9 teratocarcinoma, revealing a preferential accumulation at the tumor site.
authors.affiliation: Philochem AG, c/o ETH Zürich, Zurich, Switzerland.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Villa
authors.forename: Valeria
authors.initials: V
authors.lastname: Lovato
authors.forename: Emil
authors.initials: E
authors.lastname: Bujak
authors.forename: Sarah
authors.initials: S
authors.lastname: Wulhfard
authors.forename: Nadine
authors.initials: N
authors.lastname: Pasche
authors.forename: Dario
authors.initials: D
authors.lastname: Neri
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D018033:Antibodies, Bispecific / Q000235:genetics / Q000276:immunology / Q000493:pharmacokinetics; D000911:Antibodies, Monoclonal / Q000235:genetics* / Q000276:immunology* / Q000493:pharmacokinetics; D000918:Antibody Specificity / Q000276:immunology; D001483:Base Sequence; D016466:CHO Cells; D045744:Cell Line, Tumor; D006224:Cricetinae; D003412:Cricetulus; D000939:Epitopes / Q000276:immunology*; D005260:Female; D005353:Fibronectins / Q000276:immunology*; D006801:Humans; D051379:Mice; D057507:Mice, 129 Strain; D008969:Molecular Sequence Data; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D019151:Peptide Library; D057127:Single-Chain Antibodies / Q000235:genetics / Q000276:immunology / Q000493:pharmacokinetics; D014018:Tissue Distribution
chemical_list: D018033:Antibodies, Bispecific; D000911:Antibodies, Monoclonal; D000939:Epitopes; D005353:Fibronectins; D019151:Peptide Library; D057127:Single-Chain Antibodies; C121542:oncofetal fibronectin