Janneke A Eken, Marvyn T Koning, Kristyna Kupcova, Julieta H Sepúlveda Yáñez, Ruben A L de Groen, Edwin Quinten, Jurriaan Janssen, Cornelis A M van Bergen, Joost S P Vermaat, Arjen Cleven, Marcelo A Navarrete, Bauke Ylstra, Daphne de Jong, Ondrej Havranek, Hassan Jumaa, Hendrik Veelken
Diffuse large B cell lymphoma of activated B cell type (ABC-DLBCL), a major cell-of-origin DLBCL subtype, is characterized by chronic active B cell receptor (BCR) signaling and NF-κB activation, which can be explained by activating mutations of the BCR signaling cascade in a minority of cases. We demonstrate that autonomous BCR signaling, akin to its essential pathogenetic role in chronic lymphocytic leukemia (CLL), can explain chronic active BCR signaling in ABC-DLBCL. 13 of 18 tested DLBCL-derived BCR, including 12 cases selected for expression of IgM, induced spontaneous calcium flux and increased phosphorylation of the BCR signaling cascade in murine triple knockout pre-B cells without antigenic stimulation or external BCR crosslinking...
May 6, 2024: Journal of Experimental Medicine