Cited by 116Bone Metabolism and DiseasesProteoglycans and glycosaminoglycans researchBone and Dental Protein Studies

Heparin enhances osteoclastic bone resorption by inhibiting osteoprotegerin activity.

Irie, Atsushi, Takami, Masamichi, Kubo, Hideo, Sekino-Suzuki, Naoko, Kasahara, Kohji, Sanai, Yutaka·2007·Bone

Abstract

Heparin is a highly sulfated glycosaminoglycan and has been shown to activate osteoclastic bone resorption though how is not yet clear. Here we investigate the molecule involved in heparin-induced activation of osteoclasts using an in vitro osteoclast culture assay. The formation and activation of osteoclasts are induced by receptor activator of NFkappaB ligand (RANKL) on osteoblasts, and inhibited by osteoprotegerin (OPG), a decoy receptor of RANKL, which is secreted from osteoblasts. In a coculture of mouse bone marrow cells and osteoblasts treated with 1,25-dihydroxyvitamin D(3) and prostaglandin E(2) on dentin slices, the bone marrow cells differentiate into osteoclasts, and resorption pits are formed on the dentin slices. Addition of heparin, various glycosaminoglycans, and chemically modified heparins to the coculture reveals that heparin enhances the pit-forming activity of osteoclasts, and this effect of heparin on the activation of osteoclasts is dependent on its sugar chain structure. By contrast, mRNA expression levels of RANKL, RANK, and OPG in the coculture are not altered by heparin treatment. Furthermore, neither RANK nor RANKL binds to heparin, suggesting that heparin does not directly interact with these proteins. Instead, heparin specifically binds to OPG and prevents OPG-mediated inhibition of osteoclastic bone resorption in the coculture. Heparin treatment does not enhance osteoclastic bone resorption in a monoculture of osteoclasts derived from bone marrow cells, and in the coculture using osteoblasts from OPG-deficient mice. A (125)I-OPG binding assay showed that OPG binds to osteoblasts and that this binding is inhibited by the addition of heparin, suggesting that OPG binds to RANKL on the osteoblast membrane and that heparin blocks this interaction. These results demonstrate that heparin enhances osteoclastic bone resorption by inhibiting OPG activity.

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Crossref · 10.1016/j.bone.2007.04.190

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Authors
Irie, A., Takami, M., Kubo, H., Sekino-Suzuki, N., Kasahara, K., & Sanai, Y.
Affiliations
  • Tokyo Metropolitan Institute of Medical Science (JP)
  • SHOWA Medical University (JP)
  • Takasaki University of Health and Welfare (JP)
Corresponding author
Irie, Atsushi
Venue
Bone
Publisher
Elsevier BV
Published
2007-08
Volume
41
Issue
2
Pages
165-174
ISSN
  • 1873-2763 (ISSN-L)
  • 8756-3282
OpenAlex
W2036679520
Cited by
116
References
53
Citations by year
2026: 2 · 2025: 3 · 2024: 5 · 2023: 4 · 2022: 4 · 2021: 7 · 2020: 12 · 2019: 5 · 2018: 5 · 2017: 5 · 2016: 7 · 2015: 5 · 2013: 12 · 2012: 5
FWCI
3.44
Type
journal article
Language
en
Open access
closed
Locations
  • Bone (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Proteoglycans and glycosaminoglycans research
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
heparin, osteoclast resorption, osteoprotegerin, RANKL, RANK, glycosaminoglycans, osteoblasts, osteoclastogenesis
MeSH terms
Animals, Bone Marrow Cells, Bone Resorption, Cells, Cultured, Heparin, Humans, Mice, Inbred C57BL, Osteoblasts, Osteoclasts, Molecular Structure, Mice, Knockout, Coculture Techniques, Cell Culture Techniques, Mice, Osteoprotegerin, RANK Ligand, Receptor Activator of Nuclear Factor-kappa B

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