RRC ID 39036
Author Kania JR, Kehat-Stadler T, Kupfer SR.
Title CD44 antibodies inhibit osteoclast formation.
Journal J Bone Miner Res
Abstract Osteoclast differentiation is a complex process requiring multiple factors and sequential regulation. We have determined that CD44, a cell surface glycoprotein that is known to function as an adhesion receptor, is involved in this process. By immunocytochemistry, we show that CD44 is expressed in mouse osteoclasts that develop in primary cultures of bone marrow cells treated with 1 alpha, 25-dihydroxyvitamin D3. Monoclonal antibodies to CD44 inhibit osteoclast formation in bone marrow cultures in a dose- and time-dependent manner. In contrast, CD44 Fab monomer antibodies have no effect on osteoclast development, suggesting that the inhibition of differentiation by the whole antibodies is facilitated by cross-linking of CD44 molecules. Cocultures of spleen cells and ST2 bone marrow stromal cells indicate that hematopoietic cells mediate the CD44 antibody inhibitory effect. CD44 antibodies do not inhibit osteoclast resorption of calcified matrix, indicating that CD44 is not absolutely required for resorption activity. These observations demonstrate that CD44 may play a role in osteoclast formation and suggest mechanisms by which CD44 antibody effects are mediated.
Volume 12(8)
Pages 1155-64
Published 1997-8-1
DOI 10.1359/jbmr.1997.12.8.1155
PMID 9258745
MeSH Acid Phosphatase / chemistry Acid Phosphatase / metabolism Analysis of Variance Animals Antibodies, Monoclonal / administration & dosage Antibodies, Monoclonal / immunology* Antibodies, Monoclonal / therapeutic use Antibody Specificity Antigen-Antibody Complex Biomarkers, Tumor / chemistry Biomarkers, Tumor / metabolism Bone Marrow Cells / cytology Bone Marrow Cells / immunology Bone Resorption / drug therapy Calcitriol / pharmacology Cell Differentiation / immunology Cells, Cultured Hematopoietic Stem Cells / cytology Hematopoietic Stem Cells / immunology Hyaluronan Receptors / immunology* Immunohistochemistry Isoenzymes / chemistry Isoenzymes / metabolism Male Membrane Proteins / immunology Mice Mice, Inbred C57BL Osteoclasts / cytology Osteoclasts / immunology* Spleen / cytology Spleen / drug effects Stem Cells / cytology Tartrate-Resistant Acid Phosphatase
IF 5.854
Times Cited 25
Human and Animal Cells