52 These variable

results of TGF-β on osteoclast development could be due, in part, to differing actions of TGF-β on osteoclast precursor cells vs. the bone marrow stromal cells that support osteoclastogenesis. see more Osteoclastogenesis is mainly controlled by two cytokines, receptor activator of nuclear factor kappa B ligand (RANKL) and macrophage colonystimulating factor (M-CSF).55 RANKL is a member of the tumour necrosis factor super family that activates osteoclast differentiation, stimulates osteoclast activation and increases osteoclast survival.53, 54, 55 and 56 Walker CG and Yoshinaga Y, found that RANKL contribute to the stimulation of alveolar resorption in more than 24 h hyperocclusive state.21 and 24 While, in this experiment, the expressive change of RANKL and M-CSF were not significant(data not shown). It seems that in this experiment osteoclast differentiation has not been included in the early reactions of alveolar bone to occlusal trauma stimulation, only some

osteoclast inhibitory factors show expression decrease. Our study is the Baf-A1 first time microarray data has been provided for an opportunity to gain a better understanding of the basis for the impacts of hyperocclusion in rat on bone resorption and to identify the related signal transduction pathway. The results of our experiment show that the magnitude of osteoblast-specific genes were down-regulated in the early response of alveolar bone to traumatic occlusion, whilst the change of the osteoclast-specific genes was not shown, only some osteoclast inhibitory factors show expression decrease. Our experiment indicate that the influence of occlusal trauma to alveolar Urease bone in early stage mainly lies in the decrease of anabolic effect of osteoblast and the effect of bone resorption by osteoclast is not significant.

However, it is necessary to obtain further confirmation at the protein level and with functional analysis. This research was supported by the grant (ZR2010HM035) for Natural Science fund of Shandong Province in China. There is no conflict of interests amongst the authors. All experimental procedures were approved by the Animal Ethics and Research Committee and were conducted in accordance with the Guidelines for the Care and Use of Laboratory Animals of Shandong University. We express our gratitude to Prof. Jie Pan, director of the Key Laboratory of Animal Resistant Biology of Shandong Province in the College of Life Sciences of Shandong Normal University for valuable assistance with the treatment of the samples of animals, and to the Beijin Capitalbio Corporation in China for microarray analysis. “
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