Skip to main content

Advertisement

Log in

Prophylactic Effects of 1,24,25-Trihydroxyvitamin D3 on Ovariectomy-Induced Cancellous Bone Loss in the Rat

  • Published:
Calcified Tissue International Aims and scope Submit manuscript

Abstract.

Vitamin D metabolites can prevent estrogen depletion-induced bone loss in ovariectomized (OVX) rats. In this study, we investigated the bone-sparing effects of oral 1α,24R,25-trihydroxyvitamin D3 (1,24,25(OH)3D3) in a wide dose range in aged OVX rats. Fifty-three female Fischer-344 rats (6 months old, 170 g BW) were either ovariectomized or sham-operated (SHAM). Eight rats served as baseline controls. Groups of OVX rats (n= 7–8 each) received vehicle alone or graded oral doses of 1,24,25(OH)3D3 (0.05, 0.1, 0.2, and 0.3 μg/kg BW/day), starting five days after surgery. Urine and blood samples were collected one, two, three, and four months after surgery. Serum samples were analyzed for total calcium and alkaline phosphatase. Calcium, hydroxyproline, and collagen crosslinks (HPLC) were determined in urine. After fluorochrome double labeling, the rats were sacrificed four months postsurgery and the first lumbar vertebrae and the proximal tibiae were processed undecalcified for bone histomorphometry. Ovariectomy induced a 28% and a 69% reduction in vertebral and tibial cancellous bone area, respectively. Osteopenia in OVX rats was associated with increased histomorphometric and biochemical indices of bone turnover. The administration of 1,24,25(OH)3D3 to OVX rats dose-dependently increased vertebral and tibial cancellous bone mass, serum calcium, and urinary calcium excretion, and reduced histomorphometric and biochemical indices of bone resorption. 1,24,25(OH)3D3 at doses of 0.2 and 0.3 μg/kg/day produced strong anabolic effects, especially on vertebral cancellous bone in OVX rats, and increased mineral apposition rate and wall width of completed remodeling units relative to vehicle-treated OVX rats. Even at high doses, 1,24,25(OH)3D3 did not impair bone mineralization. We conclude that oral administration of 1,24,25(OH)3D3 can effectively prevent estrogen depletion-induced cancellous bone osteopenia in the aged OVX rat model. The therapeutic window for 1,24,25(OH)3D3 in OVX rats, however, is also narrow, comparable to that for calcitriol.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Author information

Authors and Affiliations

Authors

Additional information

Received: 29 March 1996 / Accepted: 23 September 1996

Rights and permissions

Reprints and permissions

About this article

Cite this article

Erben, R., Bante, U., Birner, H. et al. Prophylactic Effects of 1,24,25-Trihydroxyvitamin D3 on Ovariectomy-Induced Cancellous Bone Loss in the Rat. Calcif Tissue Int 60, 434–440 (1997). https://doi.org/10.1007/s002239900259

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s002239900259

Navigation