Phage display of human antibodies from a patient suffering from coeliac disease and selection of isotype-specific scFv against gliadin

Immunology. 2003 Oct;110(2):269-74. doi: 10.1046/j.1365-2567.2003.01728.x.

Abstract

Coeliac disease (CD), a gastrointestinal illness characterized by intestinal malabsorption, results from gluten intolerance accompanied with immunological responses towards gliadin, an ethanol-soluble protein fraction of wheat and other cereals. The role of gliadin in eliciting immune responses in CD is still partly unclear; however, the occurrence of anti-gliadin in the sera of patients suffering from CD correlates well with clinical symptoms. In this work we report the construction of isotype-specific, phage-displayed scFv libraries from peripheral blood lymphocytes of a patient with CD and from a healthy control individual. VH and VL chains were amplified by reverse transcription-polymerase chain reaction (RT-PCR) using a set of oligonucleotides recognizing all human variable gene families. The three scFv libraries (IgA, IgG and IgM) were selectively enriched for gliadin-binding phage. After four rounds of affinity selection, polyclonal enrichment of gliadin-binding phage was observed in all libraries from the CD patient but in none from the healthy donor. Phagemid particles generated from single clones were demonstrated to be gliadin-specific, as shown by strongly positive enzyme-linked immunosorbent assay (ELISA) and BiaCore signals. The VH and VL chains from samples of these monoclonal isotype-specific phage were sequenced to identify the most common variable regions used by the immune system to elicit antibody responses against gliadin.

MeSH terms

  • Amino Acid Sequence
  • Antibody Affinity
  • Antibody Specificity
  • Base Sequence
  • Celiac Disease / immunology*
  • Enzyme-Linked Immunosorbent Assay
  • Gliadin / immunology*
  • Humans
  • Immunoglobulin Fragments / genetics
  • Immunoglobulin Fragments / immunology
  • Immunoglobulin Isotypes / biosynthesis*
  • Immunoglobulin Isotypes / genetics
  • Immunoglobulin Variable Region / genetics
  • Immunoglobulin Variable Region / immunology
  • Molecular Sequence Data
  • Peptide Library*
  • Quality Control
  • Surface Plasmon Resonance

Substances

  • Immunoglobulin Fragments
  • Immunoglobulin Isotypes
  • Immunoglobulin Variable Region
  • Peptide Library
  • Gliadin