Affiliation:
1. From the Division of Clinical Sciences, University of Sheffield Medical School, Sheffield, United Kingdom; Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Department of Health and Human Services, Bethesda, MD; and Department of Biochemistry, Faculty of Medicine, Adnan Menderes University, Aydin, Turkey.
Abstract
AbstractADAM-9, a member of the adisintegrin and metalloproteinase family, contains both metalloproteinase and disintegrin domains. Myeloma cell lines express ADAM-9; however, its function and role in the pathophysiology of multiple myeloma is unknown. The aim of this study was to establish whether primary myeloma cells express ADAM-9, whether ADAM-9 regulates IL-6 production in human osteoblasts (hOBs), whether ADAM-9 interacts with specific integrin heterodimers, and the identity of downstream signaling pathways. Primary myeloma cells demonstrated increased expression of ADAM-9 (P < .01). ADAM-9 promoted a 5-fold increase in IL-6, but not IL-1β mRNA, and a dose- and time-dependent increase in IL-6 production by hOBs (P < .01). IL-6 induction was inhibited by an antibody to the αvβ5 integrin (P < .01) but not by antibodies to other integrin heterodimers. ADAM-9 was shown to bind directly to the αvβ5 integrin on hOBs. Antibodies to ADAM-9 and αvβ5 integrin inhibited myeloma cell–induced IL-6 production by hOBs (P < .01). Furthermore, inhibitors of p38 MAPK and cPLA2, but not NF-κB and JAK2, signaling pathways inhibited ADAM-9–induced IL-6 production by hOBs (P < .01). These data demonstrate that ADAM-9, expressed by myeloma cells, stimulates IL-6 production in hOBs by binding the αvβ5 integrin. This may have important consequences for the growth and survival of myeloma cells in bone.
Publisher
American Society of Hematology
Subject
Cell Biology,Hematology,Immunology,Biochemistry
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