Abstract
We reported that p62 (sequestosome 1) serves as a signaling hub in bone marrow stromal cells (BMSCs) for the formation of signaling complexes, including NFκB, p38MAPK and JNK, that are involved in the increased osteoclastogenesis and multiple myeloma (MM) cell growth induced by BMSCs that are key contributors to multiple myeloma bone disease (MMBD), and demonstrated that the ZZ domain of p62 (p62-ZZ) is required for BMSC enhancement of MMBD. We recently identified a novel p62-ZZ inhibitor, XRK3F2, which inhibits MM cell growth and BMSC growth enhancement of human MM cells. In the current study, we evaluate the relative specificity of XRK3F2 for p62-ZZ, characterize XRK3F2’s capacity to inhibit growth of primary MM cells and human MM cell lines, and test the in vivo effects of XRK3F2 in the immunocompetent 5TGM1 MM model. We found that XRK3F2 induces dramatic cortical bone formation that is restricted to MM containing bones and blocked the effects and upregulation of tumor necrosis factor alpha (TNFα), an osteoblast (OB) differentiation inhibitor that is increased in the MM bone marrow microenvironment and utilizes signaling complexes formed on p62-ZZ, in BMSC. Interestingly, XRK3F2 had no effect on non-MM bearing bone. These results demonstrate that targeting p62 in MM models has profound effects on MMBD.
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Acknowledgements
We thank Drs Rosen, Oyajobi, Giuliani, Stancato and Jelinek for MM cell lines. This project used the University of Pittsburgh Cancer Institute (UPCI) Clinical Pharmacology Analytical Facility (CPAF) and UPCI Small Animal Facility, supported, in part, with funding from NIH-NCI Cancer Center Support Grant P30 CA047904. Services and products in support of the research project were also generated by the VCU Massey Cancer Center Transgenic/Knock-out Mouse Facility, supported, in part, with funding from NIH-NCI Cancer Center Support Grant P30 CA016059. Funding was also received from the Multiple Myeloma Research Foundation (NK and GDR), the NIH R21CA141426, 5R01 AR059679-05, 5R21CA179017-02 (GDR) and R01DA025612, R21HL109654 (XQX), and VA Merit Review Grant 5101CX000623-04 (GDR).
Author contributions
JT and NK designed and performed in vitro research and analyzed and interpreted data; PY, RF, KM and XQX designed, synthesized and characterized XRK3F2; RS and WZ performed μCT analysis to characterize new bone formation; KSM performed histology and immunohistochemistry; NM interpreted radiographs; JG, JHB and JLE designed, performed and analyzed in vivo pharmacokinetic and pharmacodynamic experiments; JJW provided C57BL/KaLwRij mice; and RS and GDR designed the research, analyzed and interpreted data, and wrote the manuscript.
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GDR is a consultant for Amgen. XQX is a consultant for Oxis Biotech. The remaining authors declare no competing financial interests.
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Supplementary Information accompanies this paper on the Leukemia website
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Teramachi, J., Silbermann, R., Yang, P. et al. Blocking the ZZ domain of sequestosome1/p62 suppresses myeloma growth and osteoclast formation in vitro and induces dramatic bone formation in myeloma-bearing bones in vivo. Leukemia 30, 390–398 (2016). https://doi.org/10.1038/leu.2015.229
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DOI: https://doi.org/10.1038/leu.2015.229