Back to Search
Start Over
Changes in the contents of enzymatic immature, mature, and non-enzymatic senescent cross-links of collagen after once-weekly treatment with human parathyroid hormone (1-34) for 18 months contribute to improvement of bone strength in ovariectomized monkeys
- Source :
- Osteoporosis International; Aug2011, Vol. 22 Issue 8, p2373-2383, 11p, 4 Charts, 2 Graphs
- Publication Year :
- 2011
-
Abstract
- Summary: Improvements in total content of enzymatic cross-linking, the ratio of hydroxylysine-derived enzymatic cross-links, and non-enzymatic advanced glycation end product cross-link formation from once-weekly administration of hPTH(1-34) for 18 months in OVX cynomolgus monkeys contributed to the improvement of bone strength. Introduction: Parathyroid hormone (PTH) is used for the treatment of osteoporosis. To elucidate the contribution of material properties to bone strength after once-weekly treatment with hPTH(1-34) in an ovariectomized (OVX) primate model, the content of collagen and enzymatic immature, mature, and non-enzymatic cross-links, collagen maturity, trabecular architecture, and mineralization in vertebrae were simultaneously estimated. Methods: Adult female cynomolgus monkeys were divided into four groups ( n = 18-20 each) as follows: SHAM group, OVX group, and OVX monkeys given once-weekly subcutaneous injections of hPTH(1-34) either at 1.2 or 6.0 μg/kg (low- or high-PTH groups) for 18 months. The content of collagen, enzymatic and non-enzymatic cross-linking pentosidine, collagen maturity, trabecular architecture, mineralization, and cancellous bone strength of vertebrae were analyzed. Results: Low-PTH and high-hPTH treatments increased the content of enzymatic immature and mature cross-links, bone volume (BV/TV), and trabecular thickness, and decreased pentosidine, compared with the OVX group. Stepwise logistic regression analysis revealed that BV/TV, the content of total enzymatic cross-links, and calcium content independently affected ultimate load (model R = 0.748, p < 0.001) and breaking energy (model R = 0.702, p < 0.001). BV/TV was the most powerful and enzymatic cross-link content was the second powerful determinant of both ultimate load and breaking energy. The most powerful determinant of stiffness was the enzymatic cross-link content (model R = 0.270, p < 0.001). Conclusion: Once-weekly preventive administration of hPTH(1-34) increased the total contents of immature and mature enzymatic cross-links, which contributed significantly to vertebral cancellous bone strength. [ABSTRACT FROM AUTHOR]
- Subjects :
- BONE physiology
COLLAGEN
ANALYSIS of variance
ANIMAL experimentation
BIOPSY
COMPUTER software
MULTIVARIATE analysis
OVARIECTOMY
PARATHYROID hormone
PRIMATES
STATISTICS
T-test (Statistics)
TOMOGRAPHY
X-ray densitometry in medicine
LOGISTIC regression analysis
DATA analysis
EQUIPMENT & supplies
PHYSIOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 0937941X
- Volume :
- 22
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Osteoporosis International
- Publication Type :
- Academic Journal
- Accession number :
- 62519657
- Full Text :
- https://doi.org/10.1007/s00198-010-1454-4