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.
BAFF, a Novel Ligand of the Tumor Necrosis Factor Family, Stimulates B Cell Growth
Address correspondence to Jürg Tschopp, Institute of Biochemistry, University of Lausanne, Ch. des Boveresses 155, CH-1066 Epalinges, Switzerland. Phone: 41-21-692-5738; Fax: 41-21-692-5705; E-mail: [email protected]
P. Schneider and F. MacKay contributed equally to this work.
Pascal Schneider, Fabienne MacKay, Véronique Steiner, Kay Hofmann, Jean-Luc Bodmer, Nils Holler, Christine Ambrose, Pornsri Lawton, Sarah Bixler, Hans Acha-Orbea, Danila Valmori, Pedro Romero, Christiane Werner-Favre, Rudolph H. Zubler, Jeffrey L. Browning, Jürg Tschopp; BAFF, a Novel Ligand of the Tumor Necrosis Factor Family, Stimulates B Cell Growth . J Exp Med 7 June 1999; 189 (11): 1747–1756. doi: https://doi.org/10.1084/jem.189.11.1747
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