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[HLA system and rhizomelic pseudopolyarthritis].
La Semaine Des Hopitaux : Organe Fonde Par L'Association D'Enseignement Medical Des Hopitaux De Paris
|September 1, 1977
Summary
Human Leukocyte Antigen (HLA) B5 and Bw38 antigen frequencies are elevated in patients with pseudo-polyarthritis, suggesting a distinct genetic link for this joint disease. Temporal arteritis shows a separate association with HLA-B14.
Area of Science:
- Immunogenetics
- Rheumatology
- Molecular Biology
Background:
- Pseudo-polyarthritis and temporal arteritis are inflammatory conditions that can affect joints and blood vessels.
- Human Leukocyte Antigen (HLA) genes play a crucial role in immune responses and have been associated with various autoimmune and inflammatory diseases.
- Previous research suggests potential links between specific HLA antigens and certain rheumatic conditions, but the associations in pseudo-polyarthritis and temporal arteritis require further clarification.
Purpose of the Study:
- To investigate the association of specific Human Leukocyte Antigen (HLA) antigens of the A and B loci with pseudo-polyarthritis.
- To compare HLA antigen frequencies in patients with isolated pseudo-polyarthritis versus those with polyarthritis associated with temporal arteritis and temporal arteritis alone.
- To determine if pseudo-polyarthritis and temporal arteritis represent distinct disease entities based on HLA antigen associations.
Main Methods:
- A case-control study was conducted involving 50 patients diagnosed with pseudo-polyarthritis and 300 healthy control subjects.
- HLA typing was performed for HLA antigens of the A and B loci in all study participants.
- Statistical analysis, including calculation of P values and corrected P values (Pc), was used to assess the significance of HLA antigen frequency differences between groups.
Main Results:
- Significantly increased frequencies of HLA-B5 (24% vs. 13% in controls, P=0.05) and HLA-Bw38 (18% vs. 5.33% in controls, p=0.002, Pc=0.05) were observed in patients with pseudo-polyarthritis.
- Elevated frequencies of HLA-B5 and HLA-Bw38 were also noted in a subgroup of patients with both polyarthritis and temporal arteritis.
- Patients with temporal arteritis alone showed a significant association with HLA-B14 (22.9% vs. 8.6% in controls).
Conclusions:
- The findings suggest a genetic predisposition to pseudo-polyarthritis linked to specific HLA antigens, namely HLA-B5 and HLA-Bw38.
- The distinct HLA antigen associations observed in pseudo-polyarthritis and temporal arteritis indicate that these are likely separate diseases, despite occasional co-occurrence.
- Further research into the immunogenetic mechanisms underlying these conditions is warranted.