Evidence of delayed beta-cell destruction in type 1 (insulin-dependent) diabetic patients with persisting complement-fixing cytoplasmic islet cell antibodies

Diabetologia. 1984 Oct;27(4):421-6. doi: 10.1007/BF00273904.

Abstract

Forty-four children with Type 1 (insulin-dependent) diabetes (aged 0.7-16.7 years) were observed from diagnosis for cytoplasmic islet cell antibodies and serum C-peptide concentrations. Islet cell antibodies were analysed by indirect immunofluorescence for both conventional IgG and complement-fixing antibodies. Thirty-seven children (84%) were found to be positive for conventional islet cell antibodies at diagnosis, and 21 (48%) remained positive over the observation period. Twenty-six patients (59%) were positive for complement-fixing antibodies at diagnosis and eight remained so during the follow-up period. The serum C-peptide concentrations increased significantly during the first 3 months after diagnosis, after which there was a gradual decrease in the levels. Those children who remained positive for complement-fixing antibodies over the observation period had significantly higher serum C-peptide concentrations on several occasions during the second year and had also a higher integrated serum C-peptide concentration over the initial 2 years than those who became negative for complement-fixing antibodies. These observations suggest that the continuous production of complement-fixing islet cell antibodies in those patients who are positive for these antibodies at diagnosis presupposes the preservation of a sufficient amount of functioning beta cells for antigenic stimulation. These results support the view that the complement-fixing islet cell antibodies reflect ongoing destructive processes in the beta cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • C-Peptide / blood*
  • Child
  • Child, Preschool
  • Complement Fixation Tests
  • Diabetes Mellitus, Type 1 / blood
  • Diabetes Mellitus, Type 1 / immunology*
  • Diabetes Mellitus, Type 1 / pathology
  • Female
  • Follow-Up Studies
  • Humans
  • Immunoglobulin A / analysis
  • Infant
  • Insulin Antibodies / analysis*
  • Islets of Langerhans / immunology*
  • Islets of Langerhans / pathology
  • Male

Substances

  • C-Peptide
  • Immunoglobulin A
  • Insulin Antibodies