| First Author | Haffner-Luntzer M | Year | 2018 |
| Journal | Bone | Volume | 110 |
| Pages | 11-20 | PubMed ID | 29367057 |
| Mgi Jnum | J:262311 | Mgi Id | MGI:6161109 |
| Doi | 10.1016/j.bone.2018.01.017 | Citation | Haffner-Luntzer M, et al. (2018) Estrogen receptor alpha- (ERalpha), but not ERbeta-signaling, is crucially involved in mechanostimulation of bone fracture healing by whole-body vibration. Bone 110:11-20 |
| abstractText | Mechanostimulation by low-magnitude high frequency vibration (LMHFV) has been shown to provoke anabolic effects on the intact skeleton in both mice and humans. However, experimental studies revealed that, during bone fracture healing, the effect of whole-body vibration is profoundly influenced by the estrogen status. LMHFV significantly improved fracture healing in ovariectomized (OVX) mice being estrogen deficient, whereas bone regeneration was significantly reduced in non-OVX, estrogen-competent mice. Furthermore, estrogen receptors alpha (ERalpha) and beta (ERbeta) were differentially expressed in the fracture callus after whole-body vibration, depending on the estrogen status. Based on these data, we hypothesized that ERs may mediate vibration-induced effects on fracture healing. To prove this hypothesis, we investigated the effects of LMHFV on bone healing in mice lacking ERalpha or ERbeta. To study the influence of the ER ligand estrogen, both non-OVX and OVX mice were used. All mice received a femur osteotomy stabilized by an external fixator. Half of the mice were sham-operated or subjected to OVX 4weeks before osteotomy. Half of each group received LMHFV with 0.3g and 45Hz for 20min per day, 5days per week. After 21days, fracture healing was evaluated by biomechanical testing, muCT analysis, histomorphometry and immunohistochemistry. Absence of ERalpha or ERbeta did not affect fracture healing in sham-treated mice. Wildtype (WT) and ERbeta-knockout mice similarly displayed impaired bone regeneration after OVX, whereas ERalpha-knockout mice did not. Confirming previous data, in WT mice, LMHFV negatively affected bone repair in non-OVX mice, whereas OVX-induced compromised healing was significantly improved by vibration. In contrast, vibrated ERalpha-knockout mice did not display significant differences in fracture healing compared to non-vibrated animals, both in non-OVX and OVX mice. Fracture healing in ERbeta-knockout mice was similarly affected by LMHFV as in WT mice. These results suggest that ERalpha-signaling may be crucial for vibration-induced effects on fracture healing, whereas ERbeta-signaling may play a minor role. |
