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Hypergravity and microgravity exhibited reversal effects on the bone and muscle mass in mice

机译:超高提升性和微再生表现出对小鼠骨骼和肌肉质量的逆转作用

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Spaceflight is known to induce severe systemic bone loss and muscle atrophy of astronauts due to the circumstances of microgravity. We examined the influence of artificially produced 2G hypergravity on mice for bone and muscle mass with newly developed centrifuge device. We also analyzed the effects of microgravity (mostly 0G) and artificial produced 1G in ISS (international space station) on mouse bone mass. Experiment on the ground, the bone mass of humerus, femur and tibia was measured using micro-computed tomography (μCT), and the all bone mass was significantly increased in 2G compared with 1G control. In tibial bone, the mRNA expression of bone formation related genes such as Osx and Bmp2 was elevated. The volume of triceps surae muscle was also increased in 2G compared with 1G control, and the mRNA expression of myogenic factors such as Myod and Myh1 was elevated by 2G. On the other hand, microgravity in ISS significantly induced the loss of bone mass on humerus and tibia, compared with artificial 1G induced by centrifugation. Here, we firstly report that bone and muscle mass are regulated by the gravity with loaded force in both of positive and negative on the ground and in the space.
机译:众所周知,由于微匍匐的情况,众所周知,众所周知,诱导严重的全身骨质损失和宇航员肌肉萎缩。我们研究了新开发的离心机装置对骨骼和肌肉质量小鼠的人工产生的2G超高起的影响。我们还分析了小鼠(国际空间站)在小鼠骨质量上的微匍匐(大多数0G)和人工产生的1G的影响。使用微计算断层扫描(μCT)测量肱骨,肱骨,股骨和胫骨的骨质量的实验,与1G对照相比,2g的所有骨质量显着增加。在胫骨中,升高了骨形成相关基因的mRNA表达,例如osx和BMP2。与1G对照相比,2g的肱三头肌Surae肌肉的体积也增加,肌源性因子如Myod和MyH1的mRNA表达升高2g。另一方面,与离心诱导的人工1G相比,在ISS中的微匍匐显着诱导肱骨和胫骨的骨质损失。在这里,我们首先报告说,骨骼和肌肉质量受到在地面和空间中的正面和负载的负载力的重力调节。

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