Production of new trabecular bone in osteopenic ovariectomized rats by prostaglandin E2

Calcif Tissue Int. 1992 Jan;50(1):80-7. doi: 10.1007/BF00297302.

Abstract

Serum chemistry and bone morphometry of the proximal tibial metaphysis were performed in 3-month-old double fluorescent-labeled, female Sprague-Dawley rats subjected to bilateral ovariectomy or sham surgery for 4 months prior to treatment with 0, 0.3, 1, 3, or 6 mg of prostaglandin E2 (PGE2)/kg/day subcutaneously for 30 days. The 4-month postovariectomized rats possessed an osteopenic proximal tibial metaphysis with 7% trabecular area compared with controls (19%). PGE2 treatment elevated osteocalcin levels and augmented proximal tibial metaphyseal bone area in ovariectomized and sham-operated rats. Osteopenic, ovariectomized rats treated with 6 mg PGE2/kg/day for 30 days restored bone area to levels of age-matched sham-operated rats. Morphometric analyses showed increased woven and lamellar bone area, fluorescent-labeled perimeter (osteoblastic recruitment), mineral apposition rate (osteoblastic activity), bone formation rate (BFR/BV), and longitudinal bone growth. These dramatic bone changes were all significantly increased at the dose-response manner. This study showed that in vivo PGE2 is a powerful activator of bone remodeling, it increases both bone resorption and bone formation, and produces an anabolic effect by shifting bone balance to the positive direction. Furthermore, PGE2-induced augmentation of metaphyseal bone area in ovariectomized rats was at least two times greater than in sham-operated rats.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Alkaline Phosphatase / blood
  • Animals
  • Body Weight / drug effects
  • Bone Density / drug effects
  • Bone Development / drug effects
  • Bone Diseases, Metabolic / physiopathology*
  • Bone Remodeling / drug effects*
  • Bone and Bones / drug effects
  • Bone and Bones / metabolism
  • Calcium Phosphates / blood
  • Dinoprostone / administration & dosage
  • Dinoprostone / pharmacology*
  • Female
  • Microscopy, Fluorescence
  • Organ Size / drug effects
  • Osteocalcin / blood
  • Ovariectomy
  • Radioimmunoassay
  • Rats
  • Rats, Inbred Strains
  • Tibia

Substances

  • Calcium Phosphates
  • alpha-tricalcium phosphate
  • tetracalcium phosphate
  • Osteocalcin
  • calcium phosphate, monobasic, anhydrous
  • calcium phosphate
  • Alkaline Phosphatase
  • Dinoprostone
  • calcium phosphate, dibasic, anhydrous