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Laurent, S.A.* ; Hoffmann, F.S.* ; Kuhn, P.H.* ; Cheng, Q.* ; Chu, Y.* ; Schmidt-Supprian, M.* ; Hauck, S.M. ; Schuh, E.* ; Krumbholz, M.* ; Rübsamen, H.* ; Wanngren, J.* ; Khademi, M.* ; Olsson, T.* ; Alexander, T.* ; Hiepe, F.* ; Pfister, H.W.* ; Weber, F.* ; Jenne, D. ; Wekerle, H.* ; Hohlfeld, R.* ; Lichtenthaler, S.F.* ; Meinl, E.*

γ-secretase directly sheds the survival receptor BCMA from plasma cells.

Nat. Commun. 6:7333 (2015)
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Open Access Gold
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Survival of plasma cells is regulated by B-cell maturation antigen (BCMA), a membrane-bound receptor activated by its agonist ligands BAFF and APRIL. Here we report that γ-secretase directly cleaves BCMA, without prior truncation by another protease. This direct shedding is facilitated by the short length of BCMA's extracellular domain. In vitro, γ-secretase reduces BCMA-mediated NF-κB activation. In addition, γ-secretase releases soluble BCMA (sBCMA) that acts as a decoy neutralizing APRIL. In vivo, inhibition of γ-secretase enhances BCMA surface expression in plasma cells and increases their number in the bone marrow. Furthermore, in multiple sclerosis, sBCMA levels in spinal fluid are elevated and associated with intracerebral IgG production; in systemic lupus erythematosus, sBCMA levels in serum are elevated and correlate with disease activity. Together, shedding of BCMA by γ-secretase controls plasma cells in the bone marrow and yields a potential biomarker for B-cell involvement in human autoimmune diseases.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Memory B-cells; Central-nervous-system; Multiple-sclerosis; Maturation Antigen; Humoral Immunity; Member April; Bone-marrow; Nzb/w Mice; Tnf Family; Baff
ISSN (print) / ISBN 2041-1723
e-ISSN 2041-1723
Quellenangaben Volume: 6, Issue: , Pages: , Article Number: 7333 Supplement: ,
Publisher Nature Publishing Group
Publishing Place London
Reviewing status Peer reviewed