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HLA molecules in autoimmune diseases.

W E Braun1

  • 1Department of Hypertension and Nephrology, Cleveland Clinic Foundation, OH 44195.

Clinical Biochemistry
|June 1, 1992
PubMed
Summary

Human Leukocyte Antigen (HLA) associations with autoimmune diseases like diabetes and rheumatoid arthritis are becoming more precise, revealing specific molecular features linked to disease susceptibility. Molecular mimicry is a key mechanism explaining these HLA-disease links.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Autoimmune Diseases

Background:

  • Human Leukocyte Antigen (HLA) molecules play a critical role in immune responses and are strongly associated with various autoimmune diseases.
  • Previous associations focused on HLA Class I and Class II antigens, but recent advances allow for more refined molecular-level analysis.

Purpose of the Study:

  • To detail the evolving understanding of HLA associations with autoimmune diseases.
  • To explore the molecular basis of these associations, including specific amino acid sequences and potential mechanisms like molecular mimicry.

Main Methods:

  • Sequence-specific oligonucleotide probes for HLA typing.
  • Amino acid sequencing of HLA molecules.
  • Analysis of structural and functional features of HLA molecules.
  • Investigation of cross-reactivity between HLA peptides and microbial sequences.

Main Results:

  • Refined associations for insulin-dependent diabetes mellitus with specific Human Leukocyte Antigen DQ (HLA-DQ) beta and alpha chain amino acid positions.
  • Identified shared amino acid sequences between Human Leukocyte Antigen (HLA)-DR antigens in rheumatoid arthritis and Epstein-Barr virus proteins.
  • Demonstrated antibody cross-reactivity supporting molecular mimicry in ankylosing spondylitis associated with Human Leukocyte Antigen B27 (HLA-B27).

Conclusions:

  • Specific amino acid variations in HLA molecules are crucial for disease association.
  • Molecular mimicry, where microbial sequences resemble self-antigens, is a significant mechanism in HLA-associated autoimmune diseases.
  • Advanced molecular techniques are essential for dissecting complex HLA-disease relationships.

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