Involvement of ADAM9 in multinucleated giant cell formation of blood monocytes - PubMed (original) (raw)
. 2001 Nov 1;213(2):104-13.
doi: 10.1006/cimm.2001.1873.
Affiliations
- PMID: 11831872
- DOI: 10.1006/cimm.2001.1873
Involvement of ADAM9 in multinucleated giant cell formation of blood monocytes
K Namba et al. Cell Immunol. 2001.
Abstract
Monocytes-macrophages are converted to multinucleated giant cells by stimulation with various cytokines, and osteoclasts are the multinucleated giant cells derived from a monocyte-macrophage lineage. However, at present, the fusion peptides have not been clearly identified in monocytes-macrophages. The ADAM are a family of transmembrane glycoproteins that have a role in various biological functions. Interestingly, fertilin-alpha, ADAM9, and ADAM11 have potential fusion peptides. In this study, which ADAM was specifically expressed in monocytes stimulated with anti-CD98 antibody or RANKL and which factor(s) was functioning in monocytes as a fusion protein were investigated. ADAM1, 8, 10, 12, 15, 17, 20, and 21 mRNAs are expressed in blood monocytes incubated with control antibody, anti-FRP-1/CD98 antibody, or RANKL + M-CSF, while ADAM2, 7, 11, 13, 19, 23, 29, and 30 mRNAs could not be detected in these blood monocytes. Expression of ADAM9 and ADAM10 mRNAs are enhanced by either RANKL + M-CSF or anti-CD98 antibody. The expression of ADAM9 and ADAM10 is also induced in blood monocytes by anti-CD98 mAb. An anti-ADAM9 antibody enhances CD98-mediated cell aggregation, while it blocks CD98-mediated and RANKL-mediated multinucleated giant cell formation. A hydroxamate-based metalloprotease inhibitor, SI-27, which is found to suppress ADAM9 activity, suppresses multinucleated giant cell formation. New protein synthesis is necessary for the expression of ADAM9 mRNA and genistein suppresses induction of ADAM9 mRNA. This is the first report that ADAM9 is involved in monocyte fusion, such as CD98-mediated and RANKL-mediated cell fusion of blood monocytes. Furthermore, AMAM9 is one candidate for a fusion peptide in blood monocytes.
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