Expression of conformationally constrained adhesion peptide in an antibody CDR loop and inhibition of natural killer cell cytotoxic activity by an antibody antigenized with the RGD motif

Maurizio Zanetti, Gilberto Filaci, Richard H. Lee, Paolo Del Guercio, Françoise Rossi, Rosa Bacchetta, Freda Stevenson, Vincenzo Barnaba, Rosario Billetta

Research output: Contribution to journalArticlepeer-review

Abstract

We report that an antibody engineered to express three Arg-Gly-Asp (RGD) repeats in the third complementarity-determining region of the heavy chain (antigenized antibody) efficiently inhibits the lysis of human erythroleukemia K-562 cells by natural killer (NK) cells. Synthetic peptides containing RGD did not inhibit. Inhibition was specific for the (RGD)3-containing loop and required simultaneous occupancy of the Fc receptor (CD16) on effector cells. The antigenized antibody inhibited other forms of cytotoxicity mediated by NK cells but not cytotoxicity mediated by major histocompatibility complex-restricted cytotoxic T lymphocytes (CTL). A three-dimensional model of the engineered antibody loop shows the structure and physicochemical characteristics probably required for the ligand activity. The results indicate that an RGD motif is involved in the productive interaction between NK and target cells. Moreover, they show that peptide expression in the hypervariable loops of an antibody molecule is an efficient procedure for stabilizing oligopeptides within a limited spectrum of tertiary structures. This is a new approach towards imparting ligand properties to antibody molecules and can be used to study the biological function and specificity of short peptide motifs, including those involved in cell adhesion.

Original languageEnglish
Pages (from-to)4375-4384
Number of pages10
JournalEMBO Journal
Volume12
Issue number11
Publication statusPublished - 1993

Keywords

  • Antibody engineering
  • Antigenized antibody
  • Cytotoxicity
  • NK cells
  • RGD

ASJC Scopus subject areas

  • Cell Biology
  • Genetics

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