Double-Negative (Dn) B Cells: An Under-Recognized Effector Memory B Cell Subset In Autoimmunity
CLINICAL AND EXPERIMENTAL IMMUNOLOGY(2021)
Abstract
Human B cells could be divided into four classical subsets based on CD27 and immunoglobulin (Ig)D expression. Distinct from the other three well-studied subsets, CD27(-)IgD(-) B cells, also termed as double-negative (DN) B cells, have long been neglected. However, in recent years emerging evidence shows that DN B cells are unique memory B cells with important functions. They are expanded in a variety of diseases, especially in autoimmune diseases, contributing to the disease pathogenesis. Here, we briefly review the studies on DN B cells, including their origins, characteristics, subsets and roles in diseases, to try to bring new insights into this under-recognized B cell subset.
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Key words
autoimmunity, CD27, double-negative B cells, IgD, memory B cells
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