title: Hyaluronan-CD44 interaction hampers migration of osteoclast-like cells by down-regulating MMP-9.
abstract: Osteoclast (OC) precursors migrate to putative sites of bone resorption to form functionally active, multinucleated cells. The preOC FLG 29.1 cells, known to be capable of irreversibly differentiating into multinucleated OC-like cells, displayed several features of primary OCs, including expression of specific integrins and the hyaluronan (HA) receptor CD44. OC-like FLG 29.1 cells adhered to and extensively migrated through membranes coated with fibronectin, vitronectin, and laminins, but, although strongly binding to HA, totally failed to move on this substrate. Moreover, soluble HA strongly inhibited OC-like FLG 29.1 cell migration on the permissive matrix substrates, and this behavior was dependent on its engagement with CD44, as it was fully restored by function-blocking anti-CD44 antibodies. HA did not modulate the cell-substrate binding affinity/avidity nor the expression levels of the corresponding integrins. MMP-9 was the major secreted metalloproteinase used by OC-like FLG 29.1 cells for migration, because this process was strongly inhibited by both TIMP-1 and GM6001, as well as by MMP-9-specific antisense oligonucleotides. After HA binding to CD44, a strong down-regulation of MMP-9 mRNA and protein was detected. These findings highlight a novel role of the HA-CD44 interaction in the context of OC-like cell motility, suggesting that it may act as a stop signal for bone-resorbing cells.
authors.affiliation: Divisione di Oncologia Sperimentale 2, CRO-IRCCS, National Cancer Institute, 33081 Aviano, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Spessotto
authors.forename: Francesca Maria
authors.initials: FM
authors.lastname: Rossi
authors.forename: Massimo
authors.initials: M
authors.lastname: Degan
authors.forename: Raffaele
authors.initials: R
authors.lastname: Di Francia
authors.forename: Roberto
authors.initials: R
authors.lastname: Perris
authors.forename: Alfonso
authors.initials: A
authors.lastname: Colombatti
authors.forename: Valter
authors.initials: V
authors.lastname: Gattei
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000378:metabolism; D002452:Cell Count; D002465:Cell Movement; D002478:Cells, Cultured; D004151:Dipeptides / Q000494:pharmacology; D015536:Down-Regulation; D005109:Extracellular Matrix / Q000378:metabolism; D000091344:Filaggrin Proteins; D006801:Humans; D018960:Hyaluronan Receptors / Q000378:metabolism / Q000502:physiology*; D006820:Hyaluronic Acid / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D008666:Metalloendopeptidases / Q000037:antagonists & inhibitors / Q000235:genetics; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D010010:Osteoclasts / Q000166:cytology / Q000502:physiology*; D011480:Protease Inhibitors / Q000494:pharmacology; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000494:pharmacology
chemical_list: D000911:Antibodies, Monoclonal; D015815:Cell Adhesion Molecules; D004151:Dipeptides; C000717249:FLG protein, human; D000091344:Filaggrin Proteins; D018960:Hyaluronan Receptors; C078131:N-(2(R)-2-(hydroxamidocarbonylmethyl)-4-methylpentanoyl)-L-tryptophan methylamide; D016376:Oligonucleotides, Antisense; D011480:Protease Inhibitors; D019715:Tissue Inhibitor of Metalloproteinase-1; D006820:Hyaluronic Acid; D008666:Metalloendopeptidases; D020780:Matrix Metalloproteinase 9