Differential temporal effects of sclerostin antibody and parathyroid hormone on cancellous and cortical bone and quantitative differences in effects on the osteoblast lineage in young intact rats
Open accessAbstract
Sclerostin antibody (Scl-Ab) and parathyroid hormone (PTH) are bone-forming agents that have different modes of action on bone, although a study directly comparing their effects has not been conducted. The present study investigated the comparative quantitative effects of these two bone-forming agents over time on bone at the organ, tissue, and cellular level; specifically, at the level of the osteoblast (Ob) lineage in adolescent male and female rats. Briefly, eight-week old male and female Sprague-Dawley rats were administered either vehicle, Scl-Ab (3 or 50mg/kg/week subcutaneously), or human PTH (1-34) (75 μg/kg/day subcutaneously) for 4 or 26 weeks. The 50mg/kg Scl-Ab and the PTH dose were those used in the respective rat lifetime pharmacology studies. Using robust stereological methods, we compared the effects of these agents specifically at the level of the Ob lineage in vertebrae from female rats. Using RUNX2 or nestin immunostaining, location, and morphology, the total number of osteoprogenitor subpopulations, Ob, and lining cells were estimated using the fractionator or proportionator estimators. Density estimates were also calculated referent to total bone surface, total Ob surface, or total marrow volume. Scl-Ab generally effected greater increases in cancellous and cortical bone mass than PTH, correlating with higher bone formation rates (BFR) at 4 weeks in the spine and mid-femur without corresponding increases in bone resorption indices. The increases in vertebral BFR/BS at 4 weeks attenuated with continued treatment to a greater extent with Scl-Ab than with PTH. At 4 weeks, both Scl-Ab and PTH effected equivalent increases in total Ob number (Ob.N). Ob density on the formative surfaces (Ob.N/Ob.S) remained similar across groups while mineral apposition rate (MAR) was significantly higher with Scl-Ab at week 4, reflecting an increase in individual Ob vigor relative to vehicle and PTH. After 26 weeks, Scl-Ab maintained BFR/BS with fewer Ob and lower Ob.N/Ob.S by increasing the Ob footprint (bone surface area occupied by an Ob) and increasing MAR, compared with PTH. The lower Ob.N and Ob.N/Ob.S with Scl-Ab at 26 weeks were associated with decreased osteoprogenitor numbers compared with both vehicle and PTH, an effect not evident at week 4. Osteoprogenitor numbers were generally positively correlated with Ob.N across groups and timepoints, suggesting dynamic coordination between the progenitor and Ob populations. The time-dependent reductions in subpopulations of the Ob lineage with Scl-Ab may be integral to the greater attenuation or self-regulation of bone formation observed at the vertebra, as PTH required more Ob at the formative site with correlative increased numbers of progenitors compared with Scl-Ab indicating potentially greater stimulus for progenitor pool proliferation or differentiation.
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Anabolic responses to iPTH and sclerostin inhibitor treatments decline with time.
“Notably, anabolic responses to iPTH as well as sclerostin inhibitor treatments, decline with time,136”
From Bone remodeling: an operational process ensuring survival and bone mechanical competence (2022) · cites this paper as [136]
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- Authors
- Ominsky, M. S., Brown, D. L., Van, G., Cordover, D., Pacheco, E., Frazier, E., Cherepow, L., Higgins-Garn, M., Aguirre, J. I., Wronski, T. J., Stolina, M., Zhou, L., Pyrah, I., & Boyce, R. W.
- Affiliations
- Amgen (United States) (US)
- University of Florida (US)
- Corresponding author
- Boyce, Rogely Waite
- ORCID
- Venue
- Bone
- Publisher
- Elsevier BV
- Published
- 2015-12
- Volume
- 81
- Pages
- 380-391
- ISSN
- 1873-2763 (ISSN-L)
- 8756-3282
- OpenAlex
- W2164443365
- Cited by
- 93
- References
- 38
- Citations by year
- 2026: 6 · 2025: 5 · 2024: 12 · 2023: 6 · 2022: 10 · 2021: 9 · 2020: 16 · 2019: 7 · 2018: 7 · 2017: 5 · 2016: 9 · 2015: 1
- FWCI
- 7.55
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Bone (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Funders
- Amgen Inc.
- UCB Pharma
- Topics
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
- Health Sciences › Medicine › Nephrology › Parathyroid Disorders and Treatments
- Keywords
- sclerostin antibody, parathyroid hormone, bone formation rate, osteoblast lineage, mineral apposition rate, osteoblast number, osteoblast surface
- MeSH terms
- Animals, Antibodies, Monoclonal, Bone and Bones, Bone Resorption, Cell Differentiation, Female, Femur, Genetic Markers, Humans, Male, Osteoblasts, Osteogenesis, Parathyroid Hormone, Stem Cells, Tibia, Time Factors, Bone Density, Rats, Sprague-Dawley, Cell Lineage, Bone Morphogenetic Proteins, Cell Proliferation, Rats
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