Effect of epimedium pubescen flavonoid on bone mineral status and bone turnover in male rats chronically exposed to cigarette smoke

BMC Musculoskelet Disord. 2012 Jun 19;13:105. doi: 10.1186/1471-2474-13-105.

Abstract

Background: Epimedii herba is one of the most frequently used herbs in formulas that are prescribed for the treatment of osteoporosis in China and its main constituent is Epimedium pubescen flavonoid (EPF). However, it is unclear whether EPF during chronic exposure to cigarette smoke may have a protective influence on the skeleton. The present study investigated the effect of EPF on bone mineral status and bone turnover in a rat model of human relatively high exposure to cigarette smoke.

Methods: Fifty male Wistar rats were randomized into five groups: controls, passive smoking groups and passive smoking rats administered EPF at three dosage levels (75, 150 or 300 mg/kg/day) in drinking water for 4 months. A rat model of passive smoking was prepared by breeding male rats in a cigarette-smoking box. Bone mineral content (BMC), bone mineral density (BMD), bone turnover markers, bone histomorphometric parameters and biomechanical properties were examined.

Results: Smoke exposure decreased BMC and BMD, increased bone turnover (inhibited bone formation and stimulated its resorption), affected bone histomorphometry (increased trabecular separation and osteoclast surface per bone surface; decreased trabecular bone volume, trabecular thickness, trabecular number, cortical thickness, bone formation rate and osteoblast surface per bone surface), and reduced mechanical properties. EPF supplementation during cigarette smoke exposure prevented smoke-induced changes in bone mineral status and bone turnover.

Conclusion: The results suggest that EPF can prevent the adverse effects of smoke exposure on bone by stimulating bone formation and inhibiting bone turnover and bone resorption.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Absorptiometry, Photon
  • Animals
  • Biomarkers / metabolism
  • Biomechanical Phenomena
  • Bone Density / drug effects*
  • Bone Remodeling / drug effects*
  • Bone Resorption / etiology
  • Bone Resorption / metabolism
  • Bone Resorption / pathology
  • Bone Resorption / prevention & control
  • Epimedium* / chemistry
  • Femur / drug effects*
  • Femur / metabolism
  • Femur / ultrastructure
  • Flavones / isolation & purification
  • Flavones / pharmacology*
  • Lumbar Vertebrae / drug effects*
  • Lumbar Vertebrae / metabolism
  • Lumbar Vertebrae / ultrastructure
  • Male
  • Microscopy, Electron, Scanning
  • Nicotine / blood
  • Osteogenesis / drug effects
  • Plants, Medicinal
  • Rats
  • Rats, Wistar
  • Tobacco Smoke Pollution / adverse effects*

Substances

  • Biomarkers
  • Flavones
  • Tobacco Smoke Pollution
  • Nicotine