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Maintaining bone mass by bisphosphonate incadronate disodium (YM175) sequential treatment after discontinuation of intermittent human parathyroid hormone (1-34) administration in ovariectomized rats.
J Bone Miner Res. 1996 Feb; 11(2):169-77.JB

Abstract

Intermittent treatment with human parathyroid hormone (1-34) [hPTH(1-34)] stimulates bone formation and increases cancellous bone mass in ovariectomized (OVX) rats. But PTH-induced cancellous bone rapidly disappears upon cessation of treatment. The fate of cortical bone treated by PTH has not been well characterized. Incadronate disodium (disodium cycloheptylaminomethylenedisphosphonate monohydrate, YM175) was expected to be antiresorptive without inhibiting bone formation. The purposes of this study were to determine (1) whether PTH treatment increases new cancellous and cortical bone mass and bone formation, (2) whether the new bone could be maintained by YM175 sequential treatment, and (3) whether the maintenance effect is persistent after YM175 withdrawal. Eighty-eight 11-week-old Sprague-Dawley rats were divided into sham operation and OVX groups. The OVX rats were treated for 8 weeks with the subcutaneous intermittent injection of 30 micrograms/kg of hPTH(1-34) three times a week beginning 4 weeks after surgery, then PTH treatment was withdrawn and YM175 (10 micrograms/kg) was injected subcutaneously three times a week for 4 weeks. YM175 treatment was withdrawn for the last 8 weeks of the protocol. The results of microstructural assessment in proximal tibial metaphysis and bone mineral density in distal and proximal femur demonstrated that PTH treatment for 8 weeks restored bone mass to the sham control level. However, after cessation of PTH treatment, the PTH-induced tibial cancellous bone mass showed a decrease at 4 weeks and almost totally disappeared after 12 weeks. Conversely, YM175 treatment maintained the PTH-induced tibial cancellous bone mass, and the bone continued to be maintained after 8 weeks of withdrawal of the YM175. Cortical bone was not lost during PTH treatment. YM175 maintained the PTH-induced new tibial cancellous bone in OVX rats by suppressing remodeling.

Authors+Show Affiliations

Department of Orthopaedic Surgery, Niigata University School of Medicine, Japan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8822340

Citation

Takano, Y, et al. "Maintaining Bone Mass By Bisphosphonate Incadronate Disodium (YM175) Sequential Treatment After Discontinuation of Intermittent Human Parathyroid Hormone (1-34) Administration in Ovariectomized Rats." Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research, vol. 11, no. 2, 1996, pp. 169-77.
Takano Y, Tanizawa T, Mashiba T, et al. Maintaining bone mass by bisphosphonate incadronate disodium (YM175) sequential treatment after discontinuation of intermittent human parathyroid hormone (1-34) administration in ovariectomized rats. J Bone Miner Res. 1996;11(2):169-77.
Takano, Y., Tanizawa, T., Mashiba, T., Endo, N., Nishida, S., & Takahashi, H. E. (1996). Maintaining bone mass by bisphosphonate incadronate disodium (YM175) sequential treatment after discontinuation of intermittent human parathyroid hormone (1-34) administration in ovariectomized rats. Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research, 11(2), 169-77.
Takano Y, et al. Maintaining Bone Mass By Bisphosphonate Incadronate Disodium (YM175) Sequential Treatment After Discontinuation of Intermittent Human Parathyroid Hormone (1-34) Administration in Ovariectomized Rats. J Bone Miner Res. 1996;11(2):169-77. PubMed PMID: 8822340.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Maintaining bone mass by bisphosphonate incadronate disodium (YM175) sequential treatment after discontinuation of intermittent human parathyroid hormone (1-34) administration in ovariectomized rats. AU - Takano,Y, AU - Tanizawa,T, AU - Mashiba,T, AU - Endo,N, AU - Nishida,S, AU - Takahashi,H E, PY - 1996/2/1/pubmed PY - 1996/2/1/medline PY - 1996/2/1/entrez SP - 169 EP - 77 JF - Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research JO - J Bone Miner Res VL - 11 IS - 2 N2 - Intermittent treatment with human parathyroid hormone (1-34) [hPTH(1-34)] stimulates bone formation and increases cancellous bone mass in ovariectomized (OVX) rats. But PTH-induced cancellous bone rapidly disappears upon cessation of treatment. The fate of cortical bone treated by PTH has not been well characterized. Incadronate disodium (disodium cycloheptylaminomethylenedisphosphonate monohydrate, YM175) was expected to be antiresorptive without inhibiting bone formation. The purposes of this study were to determine (1) whether PTH treatment increases new cancellous and cortical bone mass and bone formation, (2) whether the new bone could be maintained by YM175 sequential treatment, and (3) whether the maintenance effect is persistent after YM175 withdrawal. Eighty-eight 11-week-old Sprague-Dawley rats were divided into sham operation and OVX groups. The OVX rats were treated for 8 weeks with the subcutaneous intermittent injection of 30 micrograms/kg of hPTH(1-34) three times a week beginning 4 weeks after surgery, then PTH treatment was withdrawn and YM175 (10 micrograms/kg) was injected subcutaneously three times a week for 4 weeks. YM175 treatment was withdrawn for the last 8 weeks of the protocol. The results of microstructural assessment in proximal tibial metaphysis and bone mineral density in distal and proximal femur demonstrated that PTH treatment for 8 weeks restored bone mass to the sham control level. However, after cessation of PTH treatment, the PTH-induced tibial cancellous bone mass showed a decrease at 4 weeks and almost totally disappeared after 12 weeks. Conversely, YM175 treatment maintained the PTH-induced tibial cancellous bone mass, and the bone continued to be maintained after 8 weeks of withdrawal of the YM175. Cortical bone was not lost during PTH treatment. YM175 maintained the PTH-induced new tibial cancellous bone in OVX rats by suppressing remodeling. SN - 0884-0431 UR - https://www.unboundmedicine.com/medline/citation/8822340/Maintaining_bone_mass_by_bisphosphonate_incadronate_disodium__YM175__sequential_treatment_after_discontinuation_of_intermittent_human_parathyroid_hormone__1_34__administration_in_ovariectomized_rats_ L2 - https://doi.org/10.1002/jbmr.5650110205 DB - PRIME DP - Unbound Medicine ER -