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Mimicking the tumour microenvironment of chronic lymphocytic leukaemia in vitro critically depends on the type of B-cell receptor stimulation

Ans Rombout (UGent) , Sofie Lust (UGent) , Fritz Offner (UGent) , Evelien Naessens (UGent) , Bruno Verhasselt (UGent) and Jan Philippé (UGent)
(2016) BRITISH JOURNAL OF CANCER. 114(6). p.704-712
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Abstract
Background: The B-cell receptor (BCR) has a key role in the cross-talk between chronic lymphocytic leukaemia (CLL) cells and the tissue microenvironment, which favours disease progression by promoting proliferation and drug resistance. In vitro studies on downstream signalling and functional effects of CLL BCR ligation often report contradictory results, in part owing to the lack of a standardised stimulation protocol. Our aim was to define a biologically relevant and robust in vitro stimulation method with regard to cellular phenotypic and transcriptional responses. Methods: We evaluated mRNA (FOS, MYC, LPL) and protein (CD54, CD19, CD62L, CD184) expression of genes modulated by BCR triggering in immunoglobulin heavy-chain variable region genes (IGHV)-mutated and -unmutated CLL cells, after stimulation using soluble or immobilised anti-IgM antibodies from different suppliers. Results: The effect of BCR stimulation on gene and protein expression was comparable in all CLL patients, irrespective of IGHV mutation status. However, immobilised anti-IgM stimulation elicited clear and robust changes in gene and protein expression, whereas the response to soluble anti-IgM was far less obvious. Conclusions: These data indicate that the method of BCR stimulation is of major importance regarding responsiveness of CLL cells in the context of the tumour microenvironment, whereas genetic differences in the BCR pathway are less critical.
Keywords
MUTATION STATUS, SURVIVAL, ZAP-70 EXPRESSION, GENE-EXPRESSION, LIPOPROTEIN-LIPASE, IGHV mutation status, microenvironment, stimulation, CLL, B-cell receptor, INHIBITOR, DISEASE, CLL, LIGATION, ANTIGEN

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Chicago
Rombout, Ans, SOFIE LUST, Fritz Offner, Evelien Naessens, Bruno Verhasselt, and Jan Philippé. 2016. “Mimicking the Tumour Microenvironment of Chronic Lymphocytic Leukaemia in Vitro Critically Depends on the Type of B-cell Receptor Stimulation.” British Journal of Cancer 114 (6): 704–712.
APA
Rombout, A., LUST, S., Offner, F., Naessens, E., Verhasselt, B., & Philippé, J. (2016). Mimicking the tumour microenvironment of chronic lymphocytic leukaemia in vitro critically depends on the type of B-cell receptor stimulation. BRITISH JOURNAL OF CANCER, 114(6), 704–712.
Vancouver
1.
Rombout A, LUST S, Offner F, Naessens E, Verhasselt B, Philippé J. Mimicking the tumour microenvironment of chronic lymphocytic leukaemia in vitro critically depends on the type of B-cell receptor stimulation. BRITISH JOURNAL OF CANCER. 2016;114(6):704–12.
MLA
Rombout, Ans, SOFIE LUST, Fritz Offner, et al. “Mimicking the Tumour Microenvironment of Chronic Lymphocytic Leukaemia in Vitro Critically Depends on the Type of B-cell Receptor Stimulation.” BRITISH JOURNAL OF CANCER 114.6 (2016): 704–712. Print.
@article{7274572,
  abstract     = {Background: The B-cell receptor (BCR) has a key role in the cross-talk between chronic lymphocytic leukaemia (CLL) cells and the tissue microenvironment, which favours disease progression by promoting proliferation and drug resistance. In vitro studies on downstream signalling and functional effects of CLL BCR ligation often report contradictory results, in part owing to the lack of a standardised stimulation protocol. Our aim was to define a biologically relevant and robust in vitro stimulation method with regard to cellular phenotypic and transcriptional responses. 
Methods: We evaluated mRNA (FOS, MYC, LPL) and protein (CD54, CD19, CD62L, CD184) expression of genes modulated by BCR triggering in immunoglobulin heavy-chain variable region genes (IGHV)-mutated and -unmutated CLL cells, after stimulation using soluble or immobilised anti-IgM antibodies from different suppliers. 
Results: The effect of BCR stimulation on gene and protein expression was comparable in all CLL patients, irrespective of IGHV mutation status. However, immobilised anti-IgM stimulation elicited clear and robust changes in gene and protein expression, whereas the response to soluble anti-IgM was far less obvious. 
Conclusions: These data indicate that the method of BCR stimulation is of major importance regarding responsiveness of CLL cells in the context of the tumour microenvironment, whereas genetic differences in the BCR pathway are less critical.},
  author       = {Rombout, Ans and Lust, Sofie and Offner, Fritz and Naessens, Evelien and Verhasselt, Bruno and Philipp{\'e}, Jan},
  issn         = {0007-0920},
  journal      = {BRITISH JOURNAL OF CANCER},
  keyword      = {MUTATION STATUS,SURVIVAL,ZAP-70 EXPRESSION,GENE-EXPRESSION,LIPOPROTEIN-LIPASE,IGHV mutation status,microenvironment,stimulation,CLL,B-cell receptor,INHIBITOR,DISEASE,CLL,LIGATION,ANTIGEN},
  language     = {eng},
  number       = {6},
  pages        = {704--712},
  title        = {Mimicking the tumour microenvironment of chronic lymphocytic leukaemia in vitro critically depends on the type of B-cell receptor stimulation},
  url          = {http://dx.doi.org/10.1038/bjc.2016.35},
  volume       = {114},
  year         = {2016},
}

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