B‐cell receptor signalling and its crosstalk with other pathways in normal and malignant cells

European Journal of Haematology - Tập 94 Số 3 - Trang 193-205 - 2015
Václav Šeda1, Marek Mráz1,2,3
1Central European Institute of Technology, Masaryk University, Brno, Czech Republic
2Department of Internal Medicine, Hematology and Oncology, University Hospital Brno
3Faculty of Medicine, Masaryk University, Brno, Czech Republic

Tóm tắt

Abstract

The physiology of B cells is intimately connected with the function of their B‐cell receptor (BCR). B‐cell lymphomas frequently (dys)regulate BCR signalling and thus take advantage of this pre‐existing pathway for B‐cell proliferation and survival. This has recently been underscored by clinical trials demonstrating that small molecules (fosfamatinib, ibrutinib, idelalisib) inhibiting BCR‐associated kinases (SYK, BTK, PI3K) have an encouraging clinical effect. Here we describe the current knowledge of the specific aspects of BCR signalling in diffuse large B‐cell lymphoma (DLBCL), follicular lymphoma, chronic lymphocytic leukaemia (CLL) and normal B cells. Multiple factors can contribute to BCR pathway (dys)regulation in these malignancies and the activation of ‘chronic’ or ‘tonic’ BCR signalling. In lymphoma B cells, the balance of initiation, amplitude and duration of BCR activation can be influenced by a specific immunoglobulin structure, the expression and mutations of adaptor molecules (like GAB1, BLNK, GRB2, CARD11), the activity of kinases (like LYN, SYK, PI3K) or phosphatases (like SHIP‐1, SHP‐1 and PTEN) and levels of microRNAs. We also discuss the crosstalk of BCR with other signalling pathways (NF‐κB, adhesion through integrins, migration and chemokine signalling) to emphasise that the ‘BCR inhibitors’ target multiple pathways interconnected with BCR, which might explain some of their clinical activity.

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