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Generation and molecular characterisation of monoclonal IgG4 rheumatoid factor from a patient with rheumatoid arthritis
  1. Masayuki Hakoda,
  2. Naoyuki Kamatani,
  3. Atsuo Taniguchi,
  4. Hiroyuki Ueda,
  5. Hisashi Yamanaka,
  6. Chihiro Terai,
  7. Sadao Kashiwazaki
  1. Institute of Rheumatology, Tokyo Women’s Medical College, KS BLDG, 9-12 Wakamatsu-cho, Shinjuku-ku, Tokyo 162, Japan
  1. Dr M Hakoda MD, Institute of Rheumatology, Tokyo Women’s Medical College, KS BLDG, 9-12 Wakamatsu-cho, Shinjuku-ku, Tokyo 162, Japan.

Abstract

OBJECTIVE To characterise IgG4 rheumatoid factor (RF) at the molecular level from a patient with rheumatoid arthritis.

METHODS B cells were cloned from the peripheral blood of a patient with rheumatoid arthritis, using EB virus transformation. The supernatants of the clones were screened for IgG RF activity by elisa. Nucleotide sequences of the expressed immunoglobulin heavy and light chain genes of one IgG RF producing clone were determined by direct sequencing of the products of a polymerase chain reaction.

RESULTS One clone producing monospecific IgG4 RF was obtained. Sequence analysis of the heavy and light chain genes suggested the accumulation of somatic mutations resulting in amino acid replacement in complementarity determining regions.

CONCLUSIONS The results may suggest an antigen driven response in the generation of IgG4 RF in rheumatoid arthritis disease processes.

  • rheumatoid factor
  • IgG4
  • monoclonal antibody
  • somatic mutation.

https://doi.org/10.1136/ard.56.1.74

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