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Preventive effects of intermittent administration of human parathyroid hormone on steroid-induced osteopenia in rats

  • Original Articles
  • Published:
Journal of Orthopaedic Science

Abstract

The purpose of this study was to determine the preventive effect of intermittent administration of human parathyroid hormone (h-PTH) on bone change in steroid-treated rats; this was done by histomorphometric and biochemical analysis. Seven-month-old female Wistar rats were divided into four groups; in-each of the four groups one subgroup was treated for 4 weeks and one for 8 weeks. The groups consisted of: untreated controls, a steroid group (receiving prednisolone), a steroid + PTH group (predniso-lone and h-PTH administered simultaneously), and a steroid + PTH vehicle group. Prednisolone (2.5 mg/kg) and h-PTH (1–34) (6.0 μg/kg) were administered six times a week during the experimental period. At necropsy, bilateral tibiae were collected: one was used for preparing undecalcified sections after Villanueva bone staining, and the other for decalcified tartrate-resistant acid phosphatase (TRAP) stained sections. Biochemical analysis showed that steroids increased urinary calcium at the 8th week; however, such bone metabolic markers as serum 1,25-(OH)2D and urinary deoxypyridinoline did not change in any treatment group. Histomorphometrically, steroid-induced osteopenia was established at the 8th week by inhibition of both bone formation and bone resorption. The simultaneous intermittent administration of PTH plus steroid, however, increased both bone formation and bone resorption, resulting in increases in bone volume beginning at 4 weeks. These results suggest that the simultaneous intermittent administration of PTH with steroid prevents steroid-induced low-turnover osteopenia by stimulating bone turnover.

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  1. Department of Orthopedic Surgery, Akita University School of Medicine, 1-1-1 Hondo, 010, Akita, Japan

    Naohisa Miyakoshi

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  1. Naohisa Miyakoshi
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Miyakoshi, N. Preventive effects of intermittent administration of human parathyroid hormone on steroid-induced osteopenia in rats. J Orthop Sci 1, 318–328 (1996). https://doi.org/10.1007/BF02348842

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  • DOI: https://doi.org/10.1007/BF02348842

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