Cited by 37Protease and Inhibitor MechanismsBone Metabolism and DiseasesBone and Dental Protein Studies

Membrane Localization of Membrane Type 1 Matrix Metalloproteinase by CD44 Regulates the Activation of Pro-Matrix Metalloproteinase 9 in Osteoclasts

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Chellaiah, Meenakshi A., Ma, Tao·2013·BioMed Research International

Abstract

CD44, MT1-MMP, and MMP9 are implicated in the migration of osteoclast and bone resorption. This study was designed to determine the functional relationship between CD44 and MT1-MMP in the activation of pro-MMP9. We used osteoclasts isolated from wild-type and CD44-null mice. Results showed that MT1-MMP is present in multiple forms with a molecular mass ~63, 55, and 45 kDa in the membrane of wild-type osteoclasts. CD44-null osteoclasts demonstrated a 55 kDa active MT1-MMP form in the membrane and conditioned medium. It failed to activate pro-MMP9 because TIMP2 binds and inhibits this MT1-MMP (~55 kDa) in CD44-null osteoclasts. The role of MT1-MMP in the activation of pro-MMP9, CD44 expression, and migration was confirmed by knockdown of MT1-MMP in wild-type osteoclasts. Although knockdown of MMP9 suppressed osteoclast migration, it had no effects on MT1-MMP activity or CD44 expression. These results suggest that CD44 and MT1-MMP are directly or indirectly involved in the regulation of pro-MMP9 activation. Surface expression of CD44, membrane localization of MT1-MMP, and activation of pro-MMP9 are the necessary sequence of events in osteoclast migration.

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Authors
Chellaiah, M. A., & Ma, T.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
Chellaiah, Meenakshi A.
Venue
BioMed Research International
Publisher
Wiley
Published
2013
Volume
2013
Pages
1-13
ISSN
  • 1110-7243 (ISSN-L)
  • 2314-6133
  • 2314-6141
OpenAlex
W2097648368
Cited by
37
References
59
Citations by year
2025: 1 · 2024: 3 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 6 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 6 · 2015: 5 · 2014: 4
FWCI
1.76
Type
journal article
Language
en
Open access
Locations
  • BioMed Research International (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
National Institutes of Health (AR46292)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
CD44, MT1-MMP, osteoclasts, osteoclast migration, bone resorption, TIMP-2, membrane localization
MeSH terms
Animals, Bone Resorption, Cell Membrane, Cell Movement, Enzyme Activation, Extracellular Matrix, Mice, Inbred C57BL, Molecular Weight, Osteoclasts, Protein Binding, Immunoblotting, Cell Polarity, Hyaluronan Receptors, Tissue Inhibitor of Metalloproteinase-2, Matrix Metalloproteinase 9, Protein Transport, RNA, Small Interfering, Mice, Matrix Metalloproteinase 14, Cell Migration Assays, Gene Knockdown Techniques

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