Ribosomal P autoantibodies in systemic lupus erythematosus. Frequencies in different ethnic groups and clinical and immunogenetic associations

Arthritis Rheum. 1996 Nov;39(11):1833-9. doi: 10.1002/art.1780391109.

Abstract

Objective: To determine the frequencies and clinical associations of antiribosomal P antibodies (anti-P) in a large multiethnic cohort of patients with systemic lupus erythematosus (SLE), and to assess whether anti-P was associated with any major histocompatibility complex (MHC) class II alleles or shared amino acid sequences.

Methods: Sera from 394 SLE patients were studied for anti-P using an enzyme-linked immunosorbent assay, and MHC class II alleles (HLA-DRB1, DQA1, and DQB1) were determined by DNA oligotyping.

Results: Anti-P antibodies were found in 13-20% of patients in the majority of ethnic groups, but were perhaps more frequent in Chinese patients (36%) and less common in Bulgarian patients (6%). Neuropsychiatric lupus (psychosis and/or depression) was significantly associated with anti-P. The HLA-DR2, DQ6 haplotypes DRB1*1501 or *1503, DQA1*0102, and DQB1*0602 were increased in anti-P-positive whites, blacks, and Mexican Americans. The HLA-DQB1*0602 allele showed the strongest association with anti-P when these 3 ethnic groups were combined and compared with both race-matched anti-P-negative SLE patients and normal controls. The HLA-DQ8 specificity (DQB1*0302) was increased both in whites and in Mexican-Americans with anti-P who were negative for HLA-DQB1*0602, and perhaps also increased in Greeks, but not in blacks, in whom HLA-DQB1*0301 was increased. A shared amino acid sequence in HLA-DQB1 (at position 26 of leucine and position 30 of tyrosine) was strongly associated with anti-P positivity (70%) versus anti-P negativity (42%) across ethnic lines.

Conclusion: The anti-P response in SLE patients, occurring in approximately 15% of patients, was strongly influenced by certain MHC class II alleles and was correlated with diffuse neuropsychiatric dysfunction.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • African Americans
  • Autoantibodies
  • European Continental Ancestry Group
  • HLA-DR Antigens / genetics
  • Haplotypes
  • Histocompatibility Antigens Class II / genetics
  • Humans
  • Lupus Erythematosus, Systemic / epidemiology
  • Lupus Erythematosus, Systemic / ethnology
  • Lupus Erythematosus, Systemic / immunology*
  • Mexican Americans
  • Polymorphism, Genetic
  • Prevalence
  • Protozoan Proteins*
  • Ribosomal Proteins / immunology*

Substances

  • Autoantibodies
  • HLA-DR Antigens
  • Histocompatibility Antigens Class II
  • L12E protein, Trypanosoma cruzi
  • Protozoan Proteins
  • Ribosomal Proteins