Cited by 76Bone Metabolism and DiseasesBone health and osteoporosis researchBone and Dental Protein Studies

Early reversal cells in adult human bone remodeling: osteoblastic nature, catabolic functions and interactions with osteoclasts

Abdelgawad, Mohamed Essameldin, Delaisse, Jean-Marie, Hinge, Maja, Jensen, Pia Rosgaard, Alnaimi, Ragad Walid, Rolighed, Lars, Engelholm, Lars H., Marcussen, Niels +1 more·2016·Histochemistry and Cell Biology

Abstract

The mechanism coupling bone resorption and formation is a burning question that remains incompletely answered through the current investigations on osteoclasts and osteoblasts. An attractive hypothesis is that the reversal cells are likely mediators of this coupling. Their nature is a big matter of debate. The present study performed on human cancellous bone is the first one combining in situ hybridization and immunohistochemistry to demonstrate their osteoblastic nature. It shows that the Runx2 and CD56 immunoreactive reversal cells appear to take up TRAcP released by neighboring osteoclasts. Earlier preclinical studies indicate that reversal cells degrade the organic matrix left behind by the osteoclasts and that this degradation is crucial for the initiation of the subsequent bone formation. To our knowledge, this study is the first addressing these catabolic activities in adult human bone through electron microscopy and analysis of molecular markers. Periosteoclastic reversal cells show direct contacts with the osteoclasts and with the demineralized resorption debris. These early reversal cells show (1) ¾-collagen fragments typically generated by extracellular collagenases of the MMP family, (2) MMP-13 (collagenase-3) and (3) the endocytic collagen receptor uPARAP/Endo180. The prevalence of these markers was lower in the later reversal cells, which are located near the osteoid surfaces and morphologically resemble mature bone-forming osteoblasts. In conclusion, this study demonstrates that reversal cells colonizing bone surfaces right after resorption are osteoblast-lineage cells, and extends to adult human bone remodeling their role in rendering eroded surfaces osteogenic.

Integrity signals

Registry

Crossref · 10.1007/s00418-016-1414-y

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58 of 58 references verified0 citation errors · 0 not checkable

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  • Early reversal cells, located in close proximity to resorbing osteoclasts and forming direct cellular contacts with neighboring osteoclasts through short cytoplasmic extensions, are osteoblast progenitors with the capacity to digest fibrillar collagen remnants, similar to BLCs.

    “Moreover, Abdelgawad et al.266 observed that early reversal cells, located in close proximity to resorbing osteoclasts and forming direct cellular contacts with neighboring osteoclasts through short cytoplasmic extensions, are osteoblast progenitors with the capacity to digest fibrillar collagen remnants, similar to BLCs.113”
  • Immunoreactivity of reversal cells for osteoclast-derived TRAcP is attributable to TRAcP taken up by osteoblast lines from neighboring osteoclasts and does not represent acquisition of an osteoclastic phenotype.

    “Abdelgawad et al.266 showed that the immunoreactivity of these cells for osteoclast-derived TRAcP is attributable to TRAcP taken up by osteoblast lines from neighboring osteoclasts and does not represent the acquisition of an osteoclastic phenotype.”

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Authors
Abdelgawad, M. E., Delaisse, J.-M., Hinge, M., Jensen, P. R., Alnaimi, R. W., Rolighed, L., Engelholm, L. H., Marcussen, N., & Andersen, T. L.
Affiliations
  • University of Southern Denmark (DK)
  • Aarhus University Hospital (DK)
  • University of Copenhagen (DK)
  • Odense University Hospital (DK)
Corresponding author
Andersen, Thomas Levin
Venue
Histochemistry and Cell Biology
Published
2016-02-09
Volume
145
Issue
6
Pages
603-615
ISSN
  • 0948-6143 (ISSN-L)
  • 1432-119X
OpenAlex
W2254323254
Cited by
76
References
58
Citations by year
2026: 1 · 2025: 6 · 2024: 7 · 2023: 9 · 2022: 7 · 2021: 10 · 2020: 10 · 2019: 9 · 2018: 5 · 2017: 7 · 2016: 4
FWCI
4.33
Type
journal article
Language
en
Open access
closed
Locations
  • Histochemistry and Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Funders
Danish Soutern region research grant (09/13570)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
bone remodeling, osteoclasts, osteoblasts, bone resorption, bone formation, Runx2, CD56, tartrate-resistant acid phosphatase, MMP-13, collagenase-3, collagen degradation, extracellular matrix, trabecular bone, osteoblast-osteoclast interaction
MeSH terms
Adult, Aged, Female, Humans, Male, Middle Aged, Osteoblasts, Osteoclasts, Bone Remodeling, Microscopy, Electron, Transmission, Hyperparathyroidism, Primary

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