Survival of activated B cell-subtype (ABC) of diffuse large B cell lymphoma (DLBCL) is driven by chronic B cell receptor (BCR) signaling that activates the canonical NF-κB pathway. Inhibition of BTK by Ibrutinib has been shown to kill ABC DLBCL cells that carry activating mutations in the BCR adaptor CD79. However, mutations in BTK or in downstream components such as CARMA1/CARD11 can render ly...

The immunodeficiency disorder, X-linked agammaglobulinemia (XLA), results from mutations in the gene encoding Bruton tyrosine kinase (Btk). Btk is required for pre-B cell clonal expansion and B-cell antigen receptor signaling. XLA patients lack mature B cells and immunoglobulin and experience recurrent bacterial infections only partially mitigated by life-long antibody replacement therapy. In p...

BACKGROUND Malignant glioma is the most common primary brain tumor in adults and has a poor prognosis. However, there are no effective targeted therapies for glioma patients. Thus, the development of novel targeted therapeutics for glioma is urgently needed. METHODS In this study, we examined the prognostic significance BTK expression in patients with glioma. Furthermore, we investigated the ...

X-linked agammaglobulinemia (XLA) is one of the most frequent inherited immunodeficiency diseases in man and is characterized by an almost complete arrest of B cell differentiation at the pre-B cell stage. The gene defective in XLA encodes the cytoplasmic signaling molecule Bruton's tyrosine kinase (Btk). Next to the CBA/N strain of mice, carrying a single amino acid substitution mutation in th...

Submit Manuscript | http://medcraveonline.com (BCR) signalling [6-8], CXCR4 and CXCR5 chemokine receptors, adhesion molecules (integrin), collagen GPVI-FCR gamma chain, GPIB-IX-V complex, CLEC-2 signalling and Toll receptor signalling. BTK is primarily expressed in haematopoietic cells, particularly in B cells, but also in monocytes/macrophages, platelets, neutrophils but not T cells and plasma...

Pre-B cells undergo apoptosis unless they are rescued by pre-B cell receptor-dependent survival signals. We previously showed that the BCR-ABL1 kinase that is expressed in pre-B lymphoblastic leukemia bypasses selection for pre-B cell receptor-dependent survival signals. Investigating possible interference of BCR-ABL1 with pre-B cell receptor signaling, we found that neither SYK nor SLP65 can b...

Bruton's tyrosine kinase (Btk) has been shown to play a role in normal B-lymphocyte development. Defective expression of Btk leads to human and murine immunodeficiencies. However, the exact role of Btk in the cytoplasmic signal transduction in B cells is still unclear. This study represents a search for the substrate for Btk in vivo. We identified one of the major phosphoproteins associated wit...

The oncogene BCR–ABL1 hijacks a B cell signaling protein by inducing the synthesis of a linker protein, according to Feldhahn and colleagues on page 1837. This study helps explain how BCR–ABL1 causes B cell leukemias in humans and identifies a potential new target for drug development. Translocation events that combine unrelated chromosomal sequences are found in up to 65% of human acute leukem...

Deletion of genes encoding the E26 transformation-specific transcription factors PU.1 and Spi-B in B cells (CD19-CreΔPB mice) leads to impaired B cell development, followed by B cell acute lymphoblastic leukemia at 100% incidence and with a median survival of 21 wk. However, little is known about the target genes that explain leukemogenesis in these mice. In this study we found that immature B ...

The triggering receptor expressed on myeloid cells 1 (TREM-1) has been implicated in the production of proinflammatory cytokines and chemokines during bacterial infection and sepsis. For downstream signal transduction, TREM-1 is coupled to the ITAM-containing adaptor DAP12. Here, we demonstrate that Bruton tyrosine kinase (Btk), a member of the Tec kinases, becomes phosphorylated upon TREM-1 tr...