Abstract
We evaluated the effects of suppressed bone remodeling caused by bisphosphonate on microdamage accumulation and degree of mineralization of bone (DMB) for the dog rib in two independent studies. Study 1: 36 female beagles, 1-2 years old, were treated daily for 1 year with saline vehicle, risedronate at 0.5 mg/kg/day, or alendronate at 1.0 mg/kg/day. Study 2: 29 beagles, 1 year old, were given lactose, or incadronate at 0.3 mg/kg/day or 0.6 mg/kg/day for 3 years. In both studies, the ninth rib was harvested. Intracortical remodeling was significantly suppressed following either 1 year or 3 years of bisphosphonate treatment without impairment of primary mineralization, although the remodeling rate was obviously lower in study 2 than in study 1 because of the aging of animals. Microdamage accumulation was significantly increased following any bisphosphonate treatment in response to the extent of remodeling suppression. One-year treatment with risedronate or alendronate did not significantly affect the mean DMB or osteonal distribution based on DMB. In contrast, mean DMB was significantly increased following 3 years of incadronate treatments, and osteonal distributions based on DMB showed a dose-dependent shift toward the higher values in incadronate-treated animals when compared with controls. Our results demonstrated that DMB was increased following only 3 years but not 1 year of bisphosphonate treatment. This finding suggests that suppressed remodeling induced by long-term bisphosphonate treatment increased DMB by increasing the population of old, highly mineralized osteons; however, the expression of this phenomenon depends on duration of the treatment because the secondary mineralization is a very slow process.
| Original language | English |
|---|---|
| Pages (from-to) | 36-42 |
| Number of pages | 7 |
| Journal | Journal of Bone and Mineral Metabolism |
| Volume | 23 |
| Issue number | SUPPL. 1 |
| DOIs | |
| State | Published - Jan 2005 |
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Keywords
- Bisphosphonate
- Cortical bone
- Degree of mineralization
- Microdamage
- Remodeling
ASJC Scopus subject areas
- Endocrinology
- Endocrinology, Diabetes and Metabolism
- Orthopedics and Sports Medicine
Cite this
THe effects of suppressed bone remodeling by bisphosphonates on microdamage accumulation and degree of mineralization in the cortical bone of dog rib. / Mashiba, T.; Mori, S.; Komatsubara, S.; Cao, Y.; Manabe, T.; Norimatsu, H.; Burr, David.
In: Journal of Bone and Mineral Metabolism, Vol. 23, No. SUPPL. 1, 01.2005, p. 36-42.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - THe effects of suppressed bone remodeling by bisphosphonates on microdamage accumulation and degree of mineralization in the cortical bone of dog rib
AU - Mashiba, T.
AU - Mori, S.
AU - Komatsubara, S.
AU - Cao, Y.
AU - Manabe, T.
AU - Norimatsu, H.
AU - Burr, David
PY - 2005/1
Y1 - 2005/1
N2 - We evaluated the effects of suppressed bone remodeling caused by bisphosphonate on microdamage accumulation and degree of mineralization of bone (DMB) for the dog rib in two independent studies. Study 1: 36 female beagles, 1-2 years old, were treated daily for 1 year with saline vehicle, risedronate at 0.5 mg/kg/day, or alendronate at 1.0 mg/kg/day. Study 2: 29 beagles, 1 year old, were given lactose, or incadronate at 0.3 mg/kg/day or 0.6 mg/kg/day for 3 years. In both studies, the ninth rib was harvested. Intracortical remodeling was significantly suppressed following either 1 year or 3 years of bisphosphonate treatment without impairment of primary mineralization, although the remodeling rate was obviously lower in study 2 than in study 1 because of the aging of animals. Microdamage accumulation was significantly increased following any bisphosphonate treatment in response to the extent of remodeling suppression. One-year treatment with risedronate or alendronate did not significantly affect the mean DMB or osteonal distribution based on DMB. In contrast, mean DMB was significantly increased following 3 years of incadronate treatments, and osteonal distributions based on DMB showed a dose-dependent shift toward the higher values in incadronate-treated animals when compared with controls. Our results demonstrated that DMB was increased following only 3 years but not 1 year of bisphosphonate treatment. This finding suggests that suppressed remodeling induced by long-term bisphosphonate treatment increased DMB by increasing the population of old, highly mineralized osteons; however, the expression of this phenomenon depends on duration of the treatment because the secondary mineralization is a very slow process.
AB - We evaluated the effects of suppressed bone remodeling caused by bisphosphonate on microdamage accumulation and degree of mineralization of bone (DMB) for the dog rib in two independent studies. Study 1: 36 female beagles, 1-2 years old, were treated daily for 1 year with saline vehicle, risedronate at 0.5 mg/kg/day, or alendronate at 1.0 mg/kg/day. Study 2: 29 beagles, 1 year old, were given lactose, or incadronate at 0.3 mg/kg/day or 0.6 mg/kg/day for 3 years. In both studies, the ninth rib was harvested. Intracortical remodeling was significantly suppressed following either 1 year or 3 years of bisphosphonate treatment without impairment of primary mineralization, although the remodeling rate was obviously lower in study 2 than in study 1 because of the aging of animals. Microdamage accumulation was significantly increased following any bisphosphonate treatment in response to the extent of remodeling suppression. One-year treatment with risedronate or alendronate did not significantly affect the mean DMB or osteonal distribution based on DMB. In contrast, mean DMB was significantly increased following 3 years of incadronate treatments, and osteonal distributions based on DMB showed a dose-dependent shift toward the higher values in incadronate-treated animals when compared with controls. Our results demonstrated that DMB was increased following only 3 years but not 1 year of bisphosphonate treatment. This finding suggests that suppressed remodeling induced by long-term bisphosphonate treatment increased DMB by increasing the population of old, highly mineralized osteons; however, the expression of this phenomenon depends on duration of the treatment because the secondary mineralization is a very slow process.
KW - Bisphosphonate
KW - Cortical bone
KW - Degree of mineralization
KW - Microdamage
KW - Remodeling
UR - http://www.scopus.com/inward/record.url?scp=23844478623&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=23844478623&partnerID=8YFLogxK
U2 - 10.1007/BF03026321
DO - 10.1007/BF03026321
M3 - Article
VL - 23
SP - 36
EP - 42
JO - Journal of Bone and Mineral Metabolism
JF - Journal of Bone and Mineral Metabolism
SN - 0910-0067
IS - SUPPL. 1
ER -