Tissue-resident macrophages promote multiple myeloma early dissemination and progression via IL-6 and TNFa
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ABSTRACT: Multiple myeloma (MM) is a plasma cell malignancy characterized by the presence of multiple foci in the skeleton. These distinct tumor foci indicate cycles of tumor growth and dissemination that seed new clusters and drives disease progression. Utilizing an intra-tibial Vk*MYC murine myeloma, we found that CD169 + radiation-resistant, tissue-resident macrophages (MPs) were critical for myeloma early dissemination and disease progression. While depletion of these MPs had no effect on tumor proliferation, it reduced myeloma BM egress and spreading to other bones, which improved overall survival as a single therapy and in combination with BM transplantation. Myeloma dissemination correlated with an increased inflammatory signature in BM MPs, as well as production of IL-6 and TNFα by tumor-associated MPs (TAMs). Exogenous i.v. IL-6 and TNFa could trigger myeloma intravasation in the BM by increasing vascular leakiness in the BM, and by enhancing myeloma motility by reducing CD138 adhesion. Moreover, mice lacking IL-6 had defects in myeloma dissemination as in MP-depleted recipients. While in TNFa or TNFaR deficient mice had defects in MM dissemination, engraftment was also impaired. These effects on myeloma dissemination required production of cytokines in the radiation-resistant compartment, containing these radiation-resistant BM MPs. Taken together, we propose BM egress of myeloma cells is regulated by localized inflammation in foci, driven in part by CD169 + MPs.
ORGANISM(S): Mus musculus
PROVIDER: GSE176385 | GEO | 2021/06/09
REPOSITORIES: GEO
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