Cited by 9Bone Metabolism and DiseasesBone health and osteoporosis researchParathyroid Disorders and Treatments

No Role of Osteocytic Osteolysis in the Development and Recovery of the Bone Phenotype Induced by Severe Secondary Hyperparathyroidism in Vitamin D Receptor Deficient Mice

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Misof, Barbara M., Blouin, Stéphane, Hofstaetter, Jochen G., Roschger, Paul, Zwerina, Jochen, Erben, Reinhold G.·2020·International Journal of Molecular Sciences

Abstract

Osteocytic osteolysis/perilacunar remodeling is thought to contribute to the maintenance of mineral homeostasis. Here, we utilized a reversible, adult-onset model of secondary hyperparathyroidism to study femoral bone mineralization density distribution (BMDD) and osteocyte lacunae sections (OLS) based on quantitative backscattered electron imaging. Male mice with a non-functioning vitamin D receptor (VDRΔ/Δ) or wild-type mice were exposed to a rescue diet (RD) (baseline) and subsequently to a low calcium challenge diet (CD). Thereafter, VDRΔ/Δ mice received either the CD, a normal diet (ND), or the RD. At baseline, BMDD and OLS characteristics were similar in VDRΔ/Δ and wild-type mice. The CD induced large cortical pores, osteomalacia, and a reduced epiphyseal average degree of mineralization in the VDRΔ/Δ mice relative to the baseline (−9.5%, p < 0.05 after two months and −10.3%, p < 0.01 after five months of the CD). Switching VDRΔ/Δ mice on the CD back to the RD fully restored BMDD to baseline values. However, OLS remained unchanged in all groups of mice, independent of diet. We conclude that adult VDRΔ/Δ animals on an RD lack any skeletal abnormalities, suggesting that VDR signaling is dispensable for normal bone mineralization as long as mineral homeostasis is normal. Our findings also indicate that VDRΔ/Δ mice attempt to correct a calcium challenge by enhanced osteoclastic resorption rather than by osteocytic osteolysis.

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  • The efficiency of this additional and independent component of bone remodeling in calcium homeostasis under PTH regulation remains unclear because of the lack of a relationship between serum PTH and osteocyte lacuna characteristics.

    “The efficiency of this additional and independent component of bone remodeling in calcium homeostasis under PTH regulation remains unclear because of the lack of a relationship between serum PTH and osteocyte lacuna characteristics.87”

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Authors
Misof, B. M., Blouin, S., Hofstaetter, J. G., Roschger, P., Zwerina, J., & Erben, R. G.
Affiliations
  • Hanusch Hospital (AT)
  • University of Veterinary Medicine Vienna (AT)
Corresponding author
Misof, Barbara M.
Venue
International Journal of Molecular Sciences
Publisher
MDPI AG
Published
2020-10-27
Volume
21
Issue
21
Pages
7989
ISSN
1422-0067 (ISSN-L)
OpenAlex
W3097786706
Cited by
9
References
32
Citations by year
2026: 1 · 2025: 1 · 2023: 2 · 2022: 1 · 2021: 4
FWCI
0.57
Type
journal article
Language
en
Open access
Locations
  • International Journal of Molecular Sciences (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Allgemeine Unfallversicherungsanstalt
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 › Nephrology › Parathyroid Disorders and Treatments
Keywords
secondary hyperparathyroidism, osteocyte lacunae, low calcium diet, osteomalacia, osteoclast resorption, mineral homeostasis
MeSH terms
Animals, Calcium, Dietary, Disease Models, Animal, Homeostasis, Hyperparathyroidism, Secondary, Male, Osteocytes, Osteolysis, Phenotype, Signal Transduction, Bone Density, Receptors, Calcitriol, Mice

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