Effects of glucocorticoids on B-cell subpopulations in patients with IgG4-related disease

Marco Lanzillotta, Emanuel Della-Torre, Raffaella Milani, Enrica Bozzolo, Emanuele Bozzalla-Cassione, Lucrezia Rovati, Paolo Giorgio Arcidiacono, Stefano Partelli, Massimo Falconi, Fabio Ciceri, Lorenzo Dagna

Research output: Contribution to journalArticle

Abstract

Objective. Glucocorticoids induce prompt clinical improvement in patients with IgG4-related disease (IgG4-RD) but their mechanisms of action in this specific condition are not fully understood. B lymphocytes appear central to IgG4-RD pathogenesis because B-cell depletion with rituximab leads to swift clinical responses. In the present work we aim to assess the effects of glucocorticoids on B-cell subpopulations in patients with IgG4-RD. Methods. Fifty patients with active untreated IgG4-RD and 20 healthy controls were enrolled in the present study. Flow cytometry analysis for total circulating CD19+ and CD20+ cells, naïve B cells, memory B cells, plasmablasts, and plasma cells was performed at baseline in all patients, and after 6 months of glucocorticoid treatment in 30 patients. Correlation studies with biomarkers of disease activity were also performed. Results. At baseline, patients with IgG4-RD showed reduced CD19+ and CD20+ B cells compared to healthy controls, but increased circulating plasmablasts and plasma cells. Circulating plasmablasts and plasma cells correlated with clinical and serological biomarkers of IgG4-RD activity. Glucocorticoid-induced disease remission was accompanied by a reduction of naïve B cell count, an increase of memory B cells, and by a depletion of circulating plasmablasts and plasma cells. CD19+ and CD20+ B cells, were not affected by glucocorticoids. Conclusion. The efficacy of glucocorticoids in IgG4-RD is associated with selective effects on different B-cell subpopulations. Further studies are warranted to fully understand possible perturbations of the naïve and memory B-cell compartments in patients with IgG4-RD.

Original languageEnglish
Pages (from-to)S159-S166
JournalClinical and Experimental Rheumatology
Volume37
Publication statusPublished - Jan 1 2019

Keywords

  • B cells
  • Corticosteroid
  • Glucocorticoid
  • IgG4-related disease
  • Plasmablasts
  • Treatment

ASJC Scopus subject areas

  • Rheumatology
  • Immunology and Allergy
  • Immunology

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    Lanzillotta, M., Della-Torre, E., Milani, R., Bozzolo, E., Bozzalla-Cassione, E., Rovati, L., Arcidiacono, P. G., Partelli, S., Falconi, M., Ciceri, F., & Dagna, L. (2019). Effects of glucocorticoids on B-cell subpopulations in patients with IgG4-related disease. Clinical and Experimental Rheumatology, 37, S159-S166.