title: Effects of 8-Prenylnaringenin and Whole-Body Vibration Therapy on a Rat Model of Osteopenia.
abstract: Background. 8-Prenylnaringenin (8-PN) is the phytoestrogen with the highest affinity for estrogen receptor-α (ER-α), which is required to maintain BMD. The osteoprotective properties of 8-PN have been demonstrated previously in tibiae. We used a rat osteopenia model to perform the first investigation of 8-PN with whole-body vertical vibration (WBVV). Study Design. Ovariectomy was performed on 52 of 64 Sprague-Dawley rats. Five weeks after ovariectomy, one group received daily injections (sc) of 8-PN (1.77 mg/kg) for 10 weeks; a second group was treated with both 8-PN and WBVV (twice a day, 15 min, 35 Hz, amplitude 0.47 mm). Other groups received either only WBVV or no treatment. Methods. The rats were sacrificed 15 weeks after ovariectomy. Lumbar vertebrae and femora were removed for biomechanical and morphological assessment. Results. 8-PN at a cancer-safe dose did not cause fundamental improvements in osteoporotic bones. Treatment with 8-PN caused a slight increase in uterine wet weight. Combined therapy using WBVV and 8-PN showed no significant improvements in bone structure and biomechanical properties. Conclusion. We cannot confirm the osteoprotective effects of 8-PN at a cancer-safe dose in primary affected osteoporotic bones. Higher concentrations of 8-PN are not advisable for safety reasons. Adjunctive therapy with WBVV demonstrates no convincing effects on bones.
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Hoffmann
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Markus H
authors.initials: MH
authors.lastname: Griesel
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Bastian
authors.initials: B
authors.lastname: Brockhusen
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Tezval
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Marina
authors.initials: M
authors.lastname: Komrakova
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Bjoern
authors.initials: B
authors.lastname: Menger
authors.affiliation: Medical Institute of General Hygiene and Environmental Health, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Marco
authors.initials: M
authors.lastname: Wassmann
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Klaus Michael
authors.initials: KM
authors.lastname: Stuermer
authors.affiliation: Department of Trauma and Reconstructive Surgery, University of Goettingen, 37075 Goettingen, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Sehmisch