Abstract
Multiple myeloma (MM) is an incurable B-cell malignancy characterized by accumulation of malignant plasma cells in bone marrow (BM) and recurrent or persistent infections. Toll-like receptors (TLRs) are essential in the host defense against infections and today 10 human TLRs (TLR1-TLR10) and one TLR-homolog (RP105) have been characterized. B cells express several TLRs (mainly TLR1, 6, 7, 9, 10 and RP105) and TLR-initiated responses in B cells include proliferation, anti-apoptosis effect and plasma cell (PC) differentiation. The present study was designed to analyze the role of TLRs in MM. We show that frequent expressions of TLRs were detected in cell lines from MM patients (minimum six TLRs in each). In comparison, only few TLRs (mainly TLR1 and or RP105) were found expressed in PCs from BM of healthy donors. In addition, TLR-specific ligands induce increased proliferation and survival of the MM cell lines, partially due to an autocrine interleukin-6 production. Importantly, we demonstrate that also PC from MM patients proliferates in response to TLR-specific ligands. In conclusion, TLR-ligands may contribute to increased growth and survival of MM cells in MM patients.
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Acknowledgements
We thank Marianne Lodahl at Herlev Hospital, University of Copenhagen, Denmark for technical assistance and Dr med. Anders Waage at St Olavs Hospital, Trondheim University Hospital, Norway for providing some of the patient material. This work was supported by grants from the Central Norway Regional Health Authority, Norwegian University of Science and Technology, the Norwegian Cancer Society and the Norwegian Research Council.
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Supplementary Information accompanies the paper on the Leukemia website (http://www.nature.com/leu)
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Bohnhorst, J., Rasmussen, T., Moen, S. et al. Toll-like receptors mediate proliferation and survival of multiple myeloma cells. Leukemia 20, 1138–1144 (2006). https://doi.org/10.1038/sj.leu.2404225
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DOI: https://doi.org/10.1038/sj.leu.2404225
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