CD32 (FcγRIIB) expression is low on CD21 B cells from systemic sclerosis patients with digital ulcers, interstitial lung disease, and anti-topoisomerase I autoantibodies.

CD21 B cells have recently been found increased in SSc-associated digital ulcers (DUs) or interstitial lung disease (ILD). To further characterize CD21 B cells which encompass autoreactive cells, we analyzed their expression of the inhibitory CD32 receptor in SSc. Peripheral blood mononuclear cells from 27 patients with SSc and 15 age-and sex-matched healthy controls (HCs) were analyzed with multicolor flow cytometry.