Abstract
Mucosa-associated lymphoid tissue (MALT) lymphoma is characterized by t(11;18)(q21;q21)/API2-MALT1, t(1;14)(p22;q32)/BCL10-IGH and t(14;18)(q32;q21)/IGH-MALT1, which commonly activate the nuclear factor (NF)-κB pathway. Gastric MALT lymphomas harboring such translocations usually do not respond to Helicobacter pylori eradication, while most of those without translocation can be cured by antibiotics. To understand the molecular mechanism of these different MALT lymphoma subgroups, we performed gene expression profiling analysis of 21 MALT lymphomas (13 translocation-positive, 8 translocation-negative). Gene set enrichment analysis (GSEA) of the NF-κB target genes and 4394 additional gene sets covering various cellular pathways, biological processes and molecular functions have shown that translocation-positive MALT lymphomas are characterized by an enhanced expression of NF-κB target genes, particularly toll like receptor (TLR)6, chemokine, CC motif, receptor (CCR)2, cluster of differentiation (CD)69 and B-cell CLL/lymphoma (BCL)2, while translocation-negative cases were featured by active inflammatory and immune responses, such as interleukin-8, CD86, CD28 and inducible T-cell costimulator (ICOS). Separate analyses of the genes differentially expressed between translocation-positive and -negative cases and measurement of gene ontology term in these differentially expressed genes by hypergeometric test reinforced the above findings by GSEA. Finally, expression of TLR6, in the presence of TLR2, enhanced both API2-MALT1 and BCL10-mediated NF-κB activation in vitro. Our findings provide novel insights into the molecular mechanism of MALT lymphomas with and without translocation, potentially explaining their different clinical behaviors.
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Acknowledgements
We would like to thank Professor Ahmet Dogan and Dr Ellen Remstein, Department of Pathology, Mayo Clinic for sharing their pulmonary MALT lymphoma gene expression microarray data; Dr Ian McFarlane, the Microarray CoreLab, National Institute of Health Research, Cambridge Comprehensive Biomedical Research Centre for his technical assistance, Dr Koichi Kuwano, Department of Infectious Medicine, Kurume University School of Medicine, Japan for providing TLR1, TLR2 and TLR6 expression constructs and both previous and present members of Du lab for helpful discussion and assistance. The research in Du lab was supported by research grants from Leukemia Research, UK and the National Institute for Health Research Cambridge Biomedical Research Center. BS was supported by Grant FWF (P19346-B12). LdL is a senior research associate of the FRS-FNRS.
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RAH designed the experiment, collected and analyzed the data. AA, HY and LG contributed to the design and experimental data collection and analysis; ARF, BS, AC, MR, IW, CDWP, KAM, LdL and PGI provided lymphoma cases; MQD designed, analyzed the data and wrote the paper.
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Hamoudi, R., Appert, A., Ye, H. et al. Differential expression of NF-κB target genes in MALT lymphoma with and without chromosome translocation: insights into molecular mechanism. Leukemia 24, 1487–1497 (2010). https://doi.org/10.1038/leu.2010.118
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DOI: https://doi.org/10.1038/leu.2010.118
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