What is the role of BCR signaling in the molecular biology of DLBCL?

Updated: Jun 12, 2019
  • Author: Shipra Gandhi, MBBS; Chief Editor: Emmanuel C Besa, MD  more...
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Activation of NFkB has also been described in ABC-DLBCL with wild-type CARD11. In this subtype of DLBCL, BCR signaling appears to play a key regulatory role. BCRs present in the surface of B cells are responsible for downstream proliferation and survival signals. [65] The BCR affects B-cell development, antigen-driven clonal selection, and humoral immunity. Structurally, the BCR consists of antigen-binding IgH and immunoglobulin L (IgL) chains noncovalently coupled to CD79A and CD79B subunits. [66] Upon antigen stimulation, clustering of the BCRs occurs, leading to signal transduction via the CD79A and B subunits. [67] CD79A or B mutations have been described in 20% of patients with ABC-DLBCL and lead to the over-expression of CD79 and over-amplification of BCR signaling. [68]

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