Cited by 341Bone Metabolism and DiseasesProtease and Inhibitor MechanismsBone and Dental Protein Studies

Matrix metalloproteinases (MMP) and cathepsin K contribute differently to osteoclastic activities

Delaissé, Jean‐Marie, Andersen, Thomas L., Engsig, Michael T., Henriksen, Kim, Troen, Tine, Blavier, Laurence·2003·Microscopy Research and Technique

Abstract

The best established proteolytic event of osteoclasts is bone matrix solubilization by the cysteine proteinase cathepsin K. Here, however, we draw the attention on osteoclastic activities depending on matrix metalloproteinases (MMPs). We discuss the observations supporting that MMPs contribute significantly to bone matrix solubilization in specific areas of the skeleton and in some developmental and pathological situations. Our discussion takes into account (1) the characteristics of the bone remodeling persisting in the absence of cathepsin K, (2) the ultrastructure of the resorption zone in response to inactivation of MMPs and of cathepsin K in different bone types, (3) bone resorption levels in MMP knockout mice compared to wild‐type mice, (4) the identification of MMPs in osteoclasts and surrounding cells, and (5) the effect of different bone pathologies on the serum concentrations of specific collagen fragments believed to discriminate between cathepsin K and MMP cleavage. Next, we provide evidence that MMPs are very critical for osteoclast migration, thereby controlling also the cell‐matrix interactions required for cell attachment/detachment. The evidence supporting this role is based on a model of osteoclast recruitment in primitive long bones, an assay of osteoclast invasion through collagen gel, and the effect of proteinase inhibitors/knockouts in these models. Furthermore, we mention observations indicating a role of MMPs in initiation of bone resorption. Finally, we emphasize the many distinct ways MMPs may alter focally the extracellular environment thereby regulating the osteoclast behavior. Although the understanding of MMPs in osteoclast biology is rapidly expanding, it is suspected that important roles remain to be discovered. Microsc. Res. Tech. 61:504–513, 2003. © 2003 Wiley‐Liss, Inc.

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Crossref · 10.1002/jemt.10374

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  • While osteoclasts express both cathepsin K and MMPs, which contribute differently to bone resorption, BLCs do not express cathepsin K but can efficiently remove nonmineralized fibrillary collagen mediated through their highly active MMPs.

    “While osteoclasts express both of these enzymes types, which contribute differently to bone resorption,120 BLCs do not express cathepsin K but can efficiently remove nonmineralized fibrillary collagen (present either on the quiescent bone surface or in resorption lacunae after osteoclastic activity)113 mediated through their highly active MMPs.121”
  • Osteoclasts initiate osteoprogenitor cell expansion by activating osteoprogenitor reservoirs located in proximity to the eroded bone surface consisting of BLCs, canopy cells and pericytes.

    “A study by Matic et al.137 led to the development of a model in which osteoclasts initiate osteoprogenitor cell expansion (see following section) by activating osteoprogenitor reservoirs located in proximity to the eroded bone surface consisting of BLCs, canopy cells and pericytes.120”

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Authors
Delaissé, J., Andersen, T. L., Engsig, M. T., Henriksen, K., Troen, T., & Blavier, L.
Affiliations
Center for Clinical & Basic Research (DK)
Corresponding author
Andersen, Thomas L.
Venue
Microscopy Research and Technique
Publisher
Wiley
Published
2003-07-18
Volume
61
Issue
6
Pages
504-513
ISSN
  • 1059-910X (ISSN-L)
  • 1097-0029
OpenAlex
W2005603603
Cited by
341
References
109
Citations by year
2026: 6 · 2025: 7 · 2024: 11 · 2023: 10 · 2022: 15 · 2021: 18 · 2020: 14 · 2019: 12 · 2018: 10 · 2017: 10 · 2016: 11 · 2015: 25 · 2014: 22 · 2013: 16 · 2012: 25
FWCI
1.35
Type
journal article
Language
en
Open access
closed
Locations
  • Microscopy Research and Technique (publishedVersion)
  • PubMed (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
matrix metalloproteinases, cathepsin K, osteoclasts, bone resorption, bone remodeling, osteoclast migration, cell-matrix interactions, bone pathology
MeSH terms
Animals, Cathepsins, Cell Movement, Humans, Osteoclasts, Signal Transduction, Bone Remodeling, Matrix Metalloproteinases, Cathepsin K

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