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- W1994432093 abstract "Bisphosphonates (BP) are antiresorptive drugs with a high affinity for bone. Despite the therapeutic success in treating osteoporosis and metabolic bone diseases, chronic BP usage has been associated with reduced repair of microdamage and atypical femoral fracture (AFF). The latter has a poor prognosis, and although anabolic interventions such as teriparatide (PTH(1-34) ) have been suggested as treatment options, there is a limited evidence base in support of their efficacy. Because PTH(1-34) acts to increase bone turnover, we hypothesized that it may be able to increase BP in turnover in the skeleton, which, in turn, may improve bone healing. To test this, we employed a mixture of fluorescent Alexa647-labelled pamidronate (Pam) and radiolabeled (14) C-ZA (zoledronic acid). These traceable BPs were dosed to Wistar rats in models of normal growth and closed fracture repair. Rats were cotreated with saline or 25 μg/kg/d PTH(1-34) , and the effects on BP liberation and bone healing were examined by X-ray, micro-CT, autoradiography, and fluorescent confocal microscopy. Consistent with increased BP remobilization with PTH(1-34) , there was a significant decrease in fluorescence in both the long bones and in the fracture callus in treated animals compared with controls. This was further confirmed by autoradiography for (14) C-ZA. In this model of acute BP treatment, callus bone volume (BV) was significantly increased in fractured limbs, and although we noted significant decreases in callus-bound BP with PTH(1-34) , these were not sufficient to alter this BV. However, increased intracellular BP was noted in resorbing osteoclasts, confirming that, in principle, PTH(1-34) increases bone turnover as well as BP turnover." @default.
- W1994432093 created "2016-06-24" @default.
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- W1994432093 date "2015-05-18" @default.
- W1994432093 modified "2023-10-05" @default.
- W1994432093 title "PTH<sub>(1-34)</sub>Treatment Increases Bisphosphonate Turnover in Fracture Repair in Rats" @default.
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- W1994432093 doi "https://doi.org/10.1002/jbmr.2424" @default.
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