Reproduction Differentially Affects Trabecular Bone Depending on Its Mechanical Versus Metabolic Role
| Autor: | Yong-Hoon Jeong, Lin Han, Chantal M.J. de Bakker, Yihan Li, Wei Ju Tseng, X. Sherry Liu, Juhanna Robberts, Hongbo Zhao, Allison R. Altman-Singles, Do-Gyoon Kim |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Bone density Finite Element Analysis Biomedical Engineering Physiology 030209 endocrinology & metabolism Lumbar vertebrae Biology Bone remodeling 03 medical and health sciences 0302 clinical medicine Bone Density Physiology (medical) Lactation medicine Animals Weaning Tibia Mechanical Phenomena Pregnancy Reproduction medicine.disease Research Papers Skeleton (computer programming) Spine Biomechanical Phenomena Rats 030104 developmental biology medicine.anatomical_structure Cancellous Bone Female Bone Remodeling |
| Zdroj: | Journal of Biomechanical Engineering. 139 |
| ISSN: | 1528-8951 0148-0731 |
| DOI: | 10.1115/1.4038110 |
| Popis: | During pregnancy and lactation, the maternal skeleton provides calcium for fetal/infant growth, resulting in substantial bone loss, which partially recovers after weaning. However, the amount of bone that is lost and the extent of post-weaning recovery are highly variable among different skeletal sites, and, despite persistent alterations in bone structure at some locations, reproductive history does not increase postmenopausal fracture risk. To explain this phenomenon, we hypothesized that the degree of reproductive bone loss/recovery at trabecular sites may vary depending on the extent to which the trabecular compartment is involved in the bone’s load-bearing function. Using a rat model, we quantified the proportion of the load carried by the trabeculae, as well as the extent of reproductive bone loss and recovery, at two distinct skeletal sites: the tibia and lumbar vertebra. Both sites underwent significant bone loss during pregnancy and lactation, which was partially recovered post-weaning. However, the extent of the deterioration and the resumption of trabecular load-bearing capacity after weaning varied substantially. Tibial trabecular bone, which bore a low proportion of the total applied load, underwent dramatic and irreversible microstructural deterioration during reproduction. Meanwhile, vertebral trabecular bone bore a greater fraction of the load, underwent minimal deterioration in microarchitecture, and resumed its full load-bearing capacity after weaning. Because pregnancy and lactation are physiological processes, the distinctive responses to these natural events among different skeletal sites may help to elucidate the extent of the trabecular bone’s structural versus metabolic functions. |
| Databáze: | OpenAIRE |
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