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Related Experiment Videos

Major histocompatibility complex class II and complement polymorphisms in postpartum thyroiditis

A B Parkes1, C Darke, S Othman

  • 1Department of Medicine, University of Wales College of Medicine, Heath Park, Cardiff, UK.

European Journal of Endocrinology
|April 1, 1996
PubMed
Summary
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This study re-evaluated the link between HLA class II antigens and postpartum thyroiditis (PPT), finding a weak association. Disturbances in complement allotypes (Bf and C4A) were also observed in PPT patients.

Area of Science:

  • Immunogenetics
  • Endocrinology
  • Autoimmune Diseases

Background:

  • Postpartum thyroiditis (PPT) is an autoimmune condition affecting women after childbirth.
  • The role of Human Leukocyte Antigen (HLA) class II antigens and complement system in PPT pathogenesis requires further investigation.

Purpose of the Study:

  • To re-evaluate the association between HLA class II (DR and DQ) antigens and PPT.
  • To determine the prevalence of class III complement allotypes (Properdin factor B, C4A, and C4B) in women with PPT.

Main Methods:

  • HLA class II and complement typing were performed on blood samples from pregnant women screened for thyroid autoantibodies.
  • Phenotypes were assigned using restriction fragment length polymorphism and immunofixation after electrophoresis.
  • PPT severity was assessed by monitoring thyroid function postpartum.

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Main Results:

  • A weak association between HLA class II antigens and PPT was confirmed, with altered frequencies of DR15, DQ6, DR5, and DQ7.
  • The increased frequency of DR5 remained significant after correction (p < 0.05).
  • PPT was associated with frequency disturbances in Bf and C4A allotypes, but not C4B.

Conclusions:

  • While no strong genetic marker for PPT was identified, the involvement of Major Histocompatibility Complex (MHC) class II region molecules (MIIC) is not precluded.
  • Observed disturbances in complement allotype frequencies suggest the class III region warrants further study in PPT.