B Cell Abnormalities in Wegeners Granulomatosis and Microscopic Polyangiitis: Role of CD25+-expressing B Cells
2010 (English)In: JOURNAL OF RHEUMATOLOGY, ISSN 0315-162X, Vol. 37, no 10, 2086-2095 p.Article in journal (Refereed) Published
Objective. The use of rituximab in vasculitis has increased interest in B cell biology. A subpopulalion of B cells expressing CD25 shows antigen-presenting properties and may have regulatory functions. We assessed subpopulations of B cell maturation (Bm) and markers related to activity and antigen presentation, and related the findings to disease activity. Methods. Multiparameter flow cytometry was used to assess numbers and proportions of circulating lymphocytes from 34 patients with vasculitis (16 remission, 18 active) and 20 controls. Results. Active vasculitis samples showed decreased proportions of Bm1 (7.8% vs 11%; p = 0.041), Bm2 (0.2% vs 0.7%; p = 0.002), and Bm3/Bm4 (0.1% vs 0.3%; p = 0.006), compared with controls; Bm2 cells were the most frequently occurring B cells but they were not significantly different in active vasculitis (74% vs 62%; p = 0.083). In patients with remission the proportion of CD25+ B cells was increased compared to controls (48% vs 29%, respectively; p = 0.006) and also compared to active vasculitis (23%; p = 0.006). The proportion of CD86+ B cells was also increased (31%) compared to active vasculitis (8%; p = 0.001), and to controls (6%; p = 0.0003). In multivariate analysis. Bm2 cells and CD25+27- B cells were independently influencing the patient group. Conclusion. In active vasculitis, a lower proportion of Bm I cells may indicate activated B cells. Patients in remission had higher proportions of CD25+ (a-chain of interleukin 2 receptor) and CD86+ (costimulatory molecule) B cells. We suggest that these B cells may have a regulatory role, or alternatively may result from previous treatment.
Place, publisher, year, edition, pages
Journal of Rheumatology , 2010. Vol. 37, no 10, 2086-2095 p.
VASCULITIS, ANTINEUTROPHIL CYTOPLASMIC ANTIBODIES, B CELLS, CD25
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-60883DOI: 10.3899/jrheum.100074ISI: 000282864400018OAI: oai:DiVA.org:liu-60883DiVA: diva2:359779