A role for IL-34 in osteolytic disease of multiple myeloma

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A role for IL-34 in osteolytic disease of multiple myeloma by Muhammad Baghdadi, Kozo Ishikawa, Sayaka Nakanishi, Tomoki Murata, Yui Umeyama, Takuto Kobayashi, Yosuke Kameda, Hiraku Endo, Haruka Wada, Bjarne Bogen, Satoshi Yamamoto, Keisuke Yamaguchi, Ikumi Kasahara, Hiroshi Iwasaki, Mutsumi Takahata, Makoto Ibata, Shuichiro Takahashi, Hideki Goto, Takanori Teshima, and Ken-ichiro Seino BloodAdv Volume 3(4):541-551 February 26, 2019 © 2019 by The American Society of Hematology

Muhammad Baghdadi et al. Blood Adv 2019;3:541-551 © 2019 by The American Society of Hematology

IL-34 expression in MOPC315.BM cells. IL-34 expression in MOPC315.BM cells. (A) PCR analysis of Il34, Cd138, and Gapdh expression in MOPC315.BM cells compared with normal plasma cells. (B) Relative expression of Il34 expression in MOPC315.BM cells compared with normal plasma cells (normalized to Gapdh). (C) Enzyme-linked immunosorbent assay (ELISA) measurement of IL-34 in the supernatants of MOPC315.BM cells stimulated for 7 days with IL-1β, IL-6, TGFβ, or TNFα (100 ng/mL) compared with PBS. (D) qRT-PCR analysis of Il34 expression in MOPC315.BM cells purified directly from the BM (day 30 after IV injection) or cultured in vitro compared with plasma cells (normalized to Gapdh). (E) Individual variability of MOPC315.BM cells homing to the bones. Top panel, The bioluminescence signals in representative BALB/c mice challenged with Luc+GFP+ MOPC315.BM cells compared with healthy controls. Bottom panel, Populations of CD138+GFP+ cells (MOPC315.BM) in the BM of femurs as analyzed by flow cytometry (day 30 after IV injection). (F) The correlation between frequencies of Luc+GFP+ MOPC315.BM cells with bioluminescence signals in femurs. (G) The correlation between frequencies of Luc+GFP+ MOPC315.BM cells with protein levels of IL-34 in the BMF of femurs. Red dots indicate levels of normal IL-34 levels in healthy controls. Data are mean ± standard error of the mean (SEM); *P < .05. ddCt, delta-delta cycle threshold; P/S, photon/second. Muhammad Baghdadi et al. Blood Adv 2019;3:541-551 © 2019 by The American Society of Hematology

Knocking down Il34 expression in MOPC315.BM cells. Knocking down Il34 expression in MOPC315.BM cells. (A) Knockdown efficiency of Il34 expression in MOPC315.BM cells that stably express Il34-specific siRNA compared with control as evaluated by qRT-PCR (control = 100%). (B) Cellular morphology of MOPC315.BMControl (top: hematoxylin and eosin stain; original magnification ×20) or MOPC315.BMIl34KD (bottom: hematoxylin and eosin stain; original magnification ×20) cells. (C) Cell proliferation as compared between MOPC315.BMControl and MOPC315.BMIl34KD cells. (D) ELISA measurement of M315 protein in the supernatants of MOPC315.BMControl or MOPC315.BMIl34KD cell cultures. (E) qRT-PCR analysis of Il34 expression in MOPC315.BMControl or MOPC315.BMIl34KD cells collected from bones of mice (n = 3) at day 30 or day 45 postinjection (normalized to Gapdh). (F-G) Bioluminescence imaging in representative BALB/c mice challenged with MOPC315.BMControl (F) or MOPC315.BMIl34KD cells (G) at day 45 postinjection. Ventral and dorsal views are shown in the top and bottom panels, respectively. Data are mean ± SEM; *P < .05. OD, optical density. Muhammad Baghdadi et al. Blood Adv 2019;3:541-551 © 2019 by The American Society of Hematology

IL-34 accelerates MM-induced osteoclast formation in vitro. IL-34 accelerates MM-induced osteoclast formation in vitro. (A) Relative expression of Csf1r, Il34, or Rankl mRNA in the CD45+ myeloid compartment, CD45− stromal compartment, or MOPC315.BM cells (normalized to Gapdh). (B) Protein levels of IL-3, IL-6, IL-34, and TNFα in the supernatants of the indicated cultures. (C) qRT-PCR analysis of Trap, Dc-stamp, Oc-stamp, or Cathepsin K in BM cells differentiated in the presence of the indicated cultures. (D) Representative photomicrographs (TRAP stain; original magnification ×5) of BM cells differentiated for 10 days in the presence of supernatants of BMSCs-MOPC315.BMControl or BMSCs-MOPC315.BMIl34KD cocultures. Yellow arrows indicate TRAP+ multinucleated cells. Data are mean ± SEM; *P < .05. N.D., not determined; N.S., not significant. Muhammad Baghdadi et al. Blood Adv 2019;3:541-551 © 2019 by The American Society of Hematology

IL-34 accelerates MM-induced osteolysis in mice. IL-34 accelerates MM-induced osteolysis in mice. (A) Transmission radiographs of the skull of mice IV injected with MM cells (MOPC315.BMControl or MOPC315.BMIl34KD) at day 45 postinjection, compared with age-matched healthy controls. Red circles refer to regions with severe bone lesions. (B) Quantitation of cortical bone thickness (centimeters), bone densities (milligrams per centimeter-cubed), and mineral volumes (milligrams) of regions described in panel A. (C) Transmission radiographs of the fifth and sixth lumbar vertebrae of mice described in panel A. (D) Quantitation of bone densities (milligrams per centimeter-cubed) and mineral volumes (milligrams) of regions described in panel C. (E) Transmission radiographs of femurs of mice described in panel A. (F) Quantitation of bone densities (milligrams per centimeter-cubed) and mineral volumes (milligrams) of regions described in panel E. Blue bars, cortical structures; red bars, trabecular structures. (G) Measurement of serum Ca2+ levels in mice described in panel A at the indicated days after injection. Data are mean ± SEM; *P < .05. Muhammad Baghdadi et al. Blood Adv 2019;3:541-551 © 2019 by The American Society of Hematology

Human MM cell–derived IL-34 accelerates osteoclast formation. Human MM cell–derived IL-34 accelerates osteoclast formation. (A) ELISA measurement of IL-34 in the supernatants of IM-9, KMS-11, OPC, OPM-2, and U226B1 human MM cell lines stimulated with IL-1β, IL-6, TGFβ, or TNFα (100 ng/mL) for 7 days. (B) Intracellular staining of IL-34 in CD19−CD138+ populations in BM aspirates collected from MM patients (Pt.). Gray histogram, isotype; red line, IL-34. (C) Fold induction of DC-STAMP (top) or OC-STAMP (bottom) expression in human CD14+ monocytes cocultured with MM cells or stimulated with BMF from IL-34High or IL-34Absent patients in the presence or absence of RANKL (referred to as R). A neutralizing antibody against IL-34 (αIL-34) or an isotype control antibody (immunoglobulin G [IgG]) was added to the culture. Unstimulated monocytes were considered as 1. Data are mean ± SEM; *P < .05. Muhammad Baghdadi et al. Blood Adv 2019;3:541-551 © 2019 by The American Society of Hematology