B cells not only play a pivotal role in humoral immunity, but also are involved in a broad spectrum of immune responses, including antigen presentation and T-cell function regulation. The identification of cell-surface CD molecules derived from a series of Human Leukocyte Differentiation Antigens (HLDA) Workshops has been instrumental to the discovery and functional characterization of human B-cell populations. Moreover, many events regulating B-cell development, activation, and effector functions are orchestrated by these cell-surface molecules. During the Ninth HLDA Workshop (HLDA9) eighteen new CDs were allocated to cell-surface molecules expressed on B cells: CD210a (IL10RA), CD215 (IL15RA), CD270 (TNFRSF14), CD307a (FCRL1), CD307b (FCRL2), CD307c (FCRL3), CD307d (FCRL4), CD351 (FCAMR), CD352 (SLAMF6), CD353 (SLAMF8), CD354 (TREM1), CD355 (CRTAM), CD357 (TNFRSF18), CD358 (TNFRSF21), CD360 (IL21RA), CD361 (EVI2B), CD362 (SDC2), and CD363 (S1PR1). Here we present their expression patterns on leukocytes, including T lymphocytes, NK cells, granulocytes, monocytes, plasmacytoid and monocyte-derived dendritic cells, and several B-cell subsets. These new CD molecules are expressed on B cells at various stages of differentiation; from bone marrow precursor pro-B cells to plasma cells. Three of them, CD307a, CD307b and CD307d, exhibit a B-cell restricted expression pattern, whereas the rest are also present on other leukocytes. In this paper we also review the structural characteristics, expression, and function of these new CD molecules. The availability of monoclonal antibodies directed against novel B cell-surface molecules will have broad implications not only for B-cell biology, but also for the development of new diagnostic and therapeutic tools.
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