Modeling the interactions between osteoblast and osteoclast activities in bone remodeling
Abstract
We propose a mathematical model explaining the interactions between osteoblasts and osteoclasts, two cell types specialized in the maintenance of the bone integrity. Bone is a dynamic, living tissue whose structure and shape continuously evolves during life. It has the ability to change architecture by removal of old bone and replacement with newly formed bone in a localized process called remodeling. The model described here is based on the idea that the relative proportions of immature and mature osteoblasts control the degree of osteoclastic activity. In addition, osteoclasts control osteoblasts differentially depending on their stage of differentiation. Despite the tremendous complexity of the bone regulatory system and its fragmentary understanding, we obtain surprisingly good correlations between the model simulations and the experimental observations extracted from the literature. The model results corroborate all behaviors of the bone remodeling system that we have simulated, including the tight coupling between osteoblasts and osteoclasts, the catabolic effect induced by continuous administration of PTH, the catabolic action of RANKL, as well as its reversal by soluble antagonist OPG. The model is also able to simulate metabolic bone diseases such as estrogen deficiency, vitamin D deficiency, senescence and glucocorticoid excess. Conversely, possible routes for therapeutic interventions are tested and evaluated. Our model confirms that anti-resorptive therapies are unable to partially restore bone loss, whereas bone formation therapies yield better results. The model enables us to determine and evaluate potential therapies based on their efficacy. In particular, the model predicts that combinations of anti-resorptive and anabolic therapies provide significant benefits compared with monotherapy, especially for certain type of skeletal disease. Finally, the model clearly indicates that increasing the size of the pool of preosteoblasts is an essential ingredient for the therapeutic manipulation of bone formation. This model was conceived as the first step in a bone turnover modeling platform. These initial modeling results are extremely encouraging and lead us to proceed with additional explorations into bone turnover and skeletal remodeling.
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The QSP model used by FDA was built on two earlier published models: a model of systemic calcium homeostasis and a cellular model of the behavior of bone morphogenic units.
“This QSP model was built on two earlier published models: a model of systemic calcium homeostasis13 and a cellular model of the behavior of bone morphogenic units.14”
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A physiologically based mathematical model of integrated calcium homeostasis and bone remodeling
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MethodA review of mathematical modeling of bone remodeling from a systems biology perspective
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- Authors
- Lemaire, V., Tobin, F. L., Greller, L. D., Cho, C. R., & Suva, L. J.
- Affiliations
- GlaxoSmithKline (United States) (US)
- Corresponding author
- Lemaire, Vincent
- Tobin, Frank L.
- Venue
- Journal of Theoretical Biology
- Publisher
- Elsevier BV
- Published
- 2004-08
- Volume
- 229
- Issue
- 3
- Pages
- 293-309
- ISSN
- 0022-5193 (ISSN-L)
- OpenAlex
- W2168376037
- Cited by
- 452
- References
- 94
- Citations by year
- 2026: 13 · 2025: 18 · 2024: 21 · 2023: 18 · 2022: 17 · 2021: 32 · 2020: 26 · 2019: 34 · 2018: 17 · 2017: 16 · 2016: 28 · 2015: 21 · 2014: 30 · 2013: 32 · 2012: 37
- FWCI
- 2.01
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Theoretical Biology (publishedVersion)
- PubMed (publishedVersion)
- 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 › Oncology › Bone health and treatments
- Keywords
- bone remodeling, osteoblasts, osteoclasts, bone turnover, mathematical model, osteoclastogenesis, parathyroid hormone, RANKL, osteoprotegerin, estrogen deficiency, vitamin D deficiency, glucocorticoid excess, bone loss, antiresorptive therapy, anabolic therapy, combination therapy
- MeSH terms
- Bone Diseases, Metabolic, Cell Communication, Humans, Models, Biological, Osteoblasts, Osteoclasts, Parathyroid Hormone, Bone Remodeling
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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