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J. Exp. Med.,
Volume 189, Number 11, June 7, 1999 1747-1756
By



From the * Institute of Biochemistry, University of Lausanne and Members of the tumor necrosis factor (TNF) family induce pleiotropic biological responses, including cell growth, differentiation, and even death. Here we describe a novel member of the
TNF family, designated BAFF (for B cell activating factor belonging to the TNF family),
which is expressed by T cells and dendritic cells. Human BAFF was mapped to chromosome
13q32-34. Membrane-bound BAFF was processed and secreted through the action of a protease whose specificity matches that of the furin family of proprotein convertases. The expression of BAFF receptor appeared to be restricted to B cells. Both membrane-bound and soluble
BAFF induced proliferation of anti-immunoglobulin M-stimulated peripheral blood B lymphocytes. Moreover, increased amounts of immunoglobulins were found in supernatants of
germinal center-like B cells costimulated with BAFF. These results suggest that BAFF plays an
important role as costimulator of B cell proliferation and function.
Swiss Institute for Experimental
Cancer Research, BIL Research Centre, CH-1066 Epalinges, Switzerland; the § Division for Clinical
Onco-Immunology, Ludwig Institute for Cancer Research, CHUV, CH-1011 Lausanne,
Switzerland; the
Division of Haematology, Geneva University Hospital, CMU, 1211 Geneva 14, Switzerland; and ¶ Biogen, Inc., Department of Immunology and Inflammation, Cambridge,
Massachusetts 02142
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