Diabetes, Vol 44, Issue 10 1227-1232, Copyright © 1995 by American Diabetes Association
Differential immunogenetic determinants of polyclonal insulin autoimmune syndrome (Hirata's disease) and monoclonal insulin autoimmune syndrome
Y Uchigata, K Tokunaga, G Nepom, M Bannai, S Kuwata, N Dozio, EA Benson, KS Ronningen, GA Spinas, K Tadokoro and al. et
Diabetes Center, Tokyo Women's Medical College, Japan.
The insulin autoimmune syndrome (IAS), or Hirata's disease, is
characterized by the combination of fasting hypoglycemia, high
concentration of total serum immunoreactive insulin, and presence of
autoantibodies to native human insulin in serum. Autoantibody production is
classified as monoclonal or polyclonal, with the majority of IAS cases
classified as polyclonal. Previously, we observed a striking association
between the human leukocyte antigen (HLA) class II alleles DRB1*0406/DQA1*
0301/DQB1*0302 and Japanese IAS patients with polyclonal insulin
autoantibodies (IAAs) and T-cell recognition of human insulin in the
context of DRB1*0406 molecules. Because of such a strong HLA association in
IAS, we performed intra- and interethnic studies on IAS-associated DRB1
alleles and searched for the critical amino acid residue(s) for IAS
pathogenesis. Glutamate at position 74 in the HLA-DR4 beta 1-chain was
presumed to be essential to the production of polyclonal IAA in IAS,
whereas alanine at the same position of the HLA-DR beta 1-chain might be
important in the production of monoclonal IAA.