Immune opsonins modulate BLyS/BAFF release in a receptor-specific fashion

Academic Article


  • TNF ligand superfamily member 13B (B lymphocyte stimulator (BLyS), B cell activating factor (BAFF)) promotes primary B cell proliferation and Ig production. While the soluble form of BLyS/BAFF is thought to be the primary biologically active form, little is known about the regulation of its cleavage and processing. We provide evidence that Fcγ receptor cross-linking triggers a rapid release of soluble, biologically active BLyS/BAFF from myeloid cells. Surprisingly, this function is primarily mediated by FcγRI, but not FcγRIIa as defined by specific mAb, and can be initiated by both IgG and C reactive protein as ligands. The generation of a B cell proliferation and survival factor by both innate and adaptive immune opsonins through engagement of an Fcγ receptor, which can also enhance Ag uptake and presentation, provides a unique opportunity to facilitate Ab production. These results provide a mechanism by which Fcγ receptors can elevate circulating BLyS levels and promote autoantibody production in immune complex-mediated autoimmune diseases. Copyright © 2008 by The American Association of Immunologists, Inc.
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Li X; Su K; Ji C; Szalai AJ; Wu J; Zhang Y; Zhou T; Kimberly RP; Edberg JC
  • Start Page

  • 1012
  • End Page

  • 1018
  • Volume

  • 181
  • Issue

  • 2