Universidade Federal de Minas Gerais - UFMG, Belo Horizonte, Brazil; Universidade Federal de Lavras - UFLA, Lavras, Brazil.
Universidade Federal de Minas Gerais - UFMG, Belo Horizonte, Brazil.
Bone. 2020 Sep;138:115496. doi: 10.1016/j.bone.2020.115496. Epub 2020 Jun 23.
The direct effects of physical activity on long bones are already recognized. However, little information is available regarding distant osseous sites, such as maxillary bone. We evaluated the influence of physical training on alveolar bone quality, with and without mechanically-induced load during orthodontic tooth movement in mice. Forty-two C57BL/6 mice were divided into sedentary, resistance and aerobic training groups. Training period lasted for eight weeks and mechanical loads (orthodontic tooth movement - OTM) were applied during the last 14 days of training. Both types of training enhanced the quality of maxillary bone, increasing bone mineral density (BMD), trabecular bone volume (BV) and bone volume/total volume ratio (BV/TV). OTM significantly reduced in trained groups. Consistently, the number of osteoblasts increased whereas the number of osteoclasts decreased on the OTM side in trained groups in comparison to the sedentary group. IGF-1, RUNX2 and OPG genes expression were also increased. The RANKL/OPG ratio and IL-6 expression were reduced in the maxillary bone. Similar results were verified in the femoral bone. In line with these findings, physical training resulted in a decrease of osteoclast differentiation from femoral bone marrow; as well as the force required to fracture the tibia of trained animals increased. Physical training also caused EDL muscle hypertrophy and increased expression of IGF-1 and IGF-1/Myostatin ratio in the gastrocnemius muscle, whereas FNDC5 gene expression was similar among groups in femur, but decreased in alveolar bone submitted to OTM. In conclusion, physical training increased bone quality, not only on long bones, but also in a distant site such as the maxilla. Differences were more evident in the course of maxillary mechanical loading. Mechanisms involve systemic and local effects on bone cells and target molecules as RANKL, OPG, IL-6 and IGF-1.
身体活动对长骨的直接影响已得到认可。然而,关于诸如上颌骨等远处骨骼部位的信息却很少。我们评估了身体训练对牙槽骨质量的影响,包括在小鼠正畸牙齿移动期间有无机械负荷。42 只 C57BL/6 小鼠被分为久坐、阻力和有氧训练组。训练期持续八周,在训练的最后 14 天施加机械负荷(正畸牙齿移动 - OTM)。两种类型的训练都增强了上颌骨的质量,增加了骨矿物质密度(BMD)、小梁骨体积(BV)和骨体积/总体积比(BV/TV)。OTM 在训练组中显著减少。一致地,与久坐组相比,训练组中 OTM 侧的成骨细胞数量增加,而破骨细胞数量减少。IGF-1、RUNX2 和 OPG 基因的表达也增加了。上颌骨中的 RANKL/OPG 比值和 IL-6 表达减少。在股骨中也验证了类似的结果。与这些发现一致,身体训练导致从股骨骨髓中分化的破骨细胞减少;以及训练动物胫骨断裂所需的力增加。身体训练还导致 EDL 肌肉肥大,并增加了腓肠肌中 IGF-1 和 IGF-1/Myostatin 比值的表达,而 FNDC5 基因在上肢骨中的表达在各组之间相似,但在上颌骨中 OTM 后减少。总之,身体训练不仅在上肢骨,而且在远处的上颌骨部位增加了骨质量。在上颌机械负荷过程中差异更为明显。机制涉及对骨细胞和靶向分子(如 RANKL、OPG、IL-6 和 IGF-1)的全身和局部影响。
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