Journal
EXPERT REVIEW OF MOLECULAR DIAGNOSTICS
Volume 18, Issue 7, Pages 675-683Publisher
TAYLOR & FRANCIS AS
DOI: 10.1080/14737159.2018.1470929
Keywords
Btz; PMN-MDSC; arginase; nor-NOHA; refractoriness; multiple myeloma
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Funding
- 2017 Brian D. Novis Research Award by the International Myeloma Foundation
- Fondazione Veronesi
- SIES (Societa Italiana Ematologia Sperimentale
- Collegio Ghislieri
- Italian Ministry of Health [RF 10/PE-2011-02350147]
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Objectives: Despite improvement in overall response due to the introduction of the first-in-class proteasome inhibitor bortezomib (btz), multiple myeloma (MM) is still an incurable disease due to the immune-suppressive bone marrow (BM) environment. Thus, the authors aimed to identify the role of CD11b(+)CD15(+)CD14(-)HLA-DR- granulocytic-like myeloid-derived suppressor cells (PMN-MDSC) in MM patients treated up-front with novel agents.Methods: In MM cell lines and primary cells derived by patients affected by MGUS and MM, we investigated sensitivity to bortezomib and lenalidomide in presence of Arg-1 and PMN-MDSC.Results: The authors found that PMN-MDSC and their function through increased arginase-1 (Arg-1) are associated with MM progression. When the authors assessed cell viability of the human myeloma cell lines MM1.s, OPM2 and U266 treated with 5-20nM btz for 24h in PMN-MDSC conditioned media, they disclosed that amount of Arg-1 and Arg-1 inhibition could affect btz sensitivity in-vitro.PMN-MDSC and Arg-1 were increased in peripheral blood of newly diagnosed MM patients compared to healthy subjects. PMN-MDSC and arginase were reduced after exposure to lenalidomide-based regimen but increased after btz-based treatment.Conclusion: In MM, Arg-1 is mainly expressed by PMN-MDSC. PMN-MDSC and Arg-1 are reduced in vivo after lenalidomide but not bortezomib treatment.
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