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Changes in chemical composition of cortical bone associated with bone fragility in rat model with chronic kidney disease.
Bone. 2011 Jun 01; 48(6):1260-7.BONE

Abstract

Bone fragility is a complication of chronic kidney disease (CKD). Patients on dialysis have higher risk of fracture than the general population, but the reason remains obscure. Bone strength is determined by bone mass and bone quality. Although factors affecting bone quality include microarchitecture, remodeling activity, mineral content, and collagen composition, it remains unclear which factor is critically important for bone strength in CKD. We conducted an in vivo study to elucidate the factors that reduce bone mechanical property in CKD. Rats underwent thyroparathyroidectomy and progressive partial nephrectomy (TPTx-Nx). Bone mechanical property, bone mineral density (BMD), and cortical bone chemical composition (all in femur) as well as histomorphometry (in tibia) were determined. The storage modulus, which is a mechanical factor, was reduced in CKD model rats compared with controls that underwent thyroparathyroidectomy alone (TPTx). There were no differences in BMD and histomorphometric parameters between groups. However, cortical bone chemical composition differed: mineral to matrix ratio and carbonate substitution increased whereas crystallinity decreased in TPTx-Nx. In addition, enzymatic crosslinks ratio and pentosidine to matrix ratio also increased. These changes were significant in TPTx-Nx rats with most impaired renal function. Stepwise multiple regression analysis identified mature to immature crosslink ratio and crystallinity as independent contributors to storage modulus. Deteriorated bone mechanical properties in CKD may be caused by changes in chemical composition of the cortical bone, and is independent of BMD or cancellous bone microarchitecture.

Authors+Show Affiliations

Department of Health Sciences, Oita University of Nursing and Health Sciences, Oita, 870-1201, Japan. iwasaki@oita-nhs.ac.jpNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21397740

Citation

Iwasaki, Yoshiko, et al. "Changes in Chemical Composition of Cortical Bone Associated With Bone Fragility in Rat Model With Chronic Kidney Disease." Bone, vol. 48, no. 6, 2011, pp. 1260-7.
Iwasaki Y, Kazama JJ, Yamato H, et al. Changes in chemical composition of cortical bone associated with bone fragility in rat model with chronic kidney disease. Bone. 2011;48(6):1260-7.
Iwasaki, Y., Kazama, J. J., Yamato, H., & Fukagawa, M. (2011). Changes in chemical composition of cortical bone associated with bone fragility in rat model with chronic kidney disease. Bone, 48(6), 1260-7. https://doi.org/10.1016/j.bone.2011.03.672
Iwasaki Y, et al. Changes in Chemical Composition of Cortical Bone Associated With Bone Fragility in Rat Model With Chronic Kidney Disease. Bone. 2011 Jun 1;48(6):1260-7. PubMed PMID: 21397740.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Changes in chemical composition of cortical bone associated with bone fragility in rat model with chronic kidney disease. AU - Iwasaki,Yoshiko, AU - Kazama,Junichiro James, AU - Yamato,Hideyuki, AU - Fukagawa,Masafumi, Y1 - 2011/03/21/ PY - 2010/09/18/received PY - 2011/02/10/revised PY - 2011/03/04/accepted PY - 2011/3/15/entrez PY - 2011/3/15/pubmed PY - 2011/9/29/medline SP - 1260 EP - 7 JF - Bone JO - Bone VL - 48 IS - 6 N2 - Bone fragility is a complication of chronic kidney disease (CKD). Patients on dialysis have higher risk of fracture than the general population, but the reason remains obscure. Bone strength is determined by bone mass and bone quality. Although factors affecting bone quality include microarchitecture, remodeling activity, mineral content, and collagen composition, it remains unclear which factor is critically important for bone strength in CKD. We conducted an in vivo study to elucidate the factors that reduce bone mechanical property in CKD. Rats underwent thyroparathyroidectomy and progressive partial nephrectomy (TPTx-Nx). Bone mechanical property, bone mineral density (BMD), and cortical bone chemical composition (all in femur) as well as histomorphometry (in tibia) were determined. The storage modulus, which is a mechanical factor, was reduced in CKD model rats compared with controls that underwent thyroparathyroidectomy alone (TPTx). There were no differences in BMD and histomorphometric parameters between groups. However, cortical bone chemical composition differed: mineral to matrix ratio and carbonate substitution increased whereas crystallinity decreased in TPTx-Nx. In addition, enzymatic crosslinks ratio and pentosidine to matrix ratio also increased. These changes were significant in TPTx-Nx rats with most impaired renal function. Stepwise multiple regression analysis identified mature to immature crosslink ratio and crystallinity as independent contributors to storage modulus. Deteriorated bone mechanical properties in CKD may be caused by changes in chemical composition of the cortical bone, and is independent of BMD or cancellous bone microarchitecture. SN - 1873-2763 UR - https://www.unboundmedicine.com/medline/citation/21397740/Changes_in_chemical_composition_of_cortical_bone_associated_with_bone_fragility_in_rat_model_with_chronic_kidney_disease L2 - https://linkinghub.elsevier.com/retrieve/pii/S8756-3282(11)00774-5 DB - PRIME DP - Unbound Medicine ER -