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Muscle regeneration potential and satellite cell activation profile during recovery following hindlimb immobilization in mice

机译:肌肉再生潜力和卫星细胞在复苏后激活配置文件下肢固定在老鼠身上

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Reduced muscle activity leads to muscle atrophy and function loss in patients and animal models. Satellite cells (SCs) are postnatal muscle stem cells that play a pivotal role in skeletal muscle regeneration following injury. The regenerative potential, satellite cell numbers, and markers during recovery following immobilization of the hindlimb for 7 days were explored. In mice exposed to 7 days of hindlimb immobilization, in those exposed to recovery (7 days, splint removal), and in contralateral control muscles, muscle precursor cells were isolated from all hindlimb muscles (fluorescence‐activated cell sorting, FACS) and SCs, and muscle regeneration were identified using immunofluorescence (gastrocnemius and soleus) and electron microscopy (EM, gastrocnemius). Expression of ki67 , pax7 , myoD , and myogenin was quantified (RT‐PCR) from SC FACS yields. Body and grip strength were determined. Following 7 day hindlimb immobilization, a decline in SCs (FACS, immunofluorescence) was observed together with an upregulation of SC activation markers and signs of muscle regeneration including fusion to existing myofibers (EM). Recovery following hindlimb immobilization was characterized by a program of muscle regeneration events. Hindlimb immobilization induced a decline in SCs together with an upregulation of markers of SC activation, suggesting that fusion to existing myofibers takes place during unloading. Muscle recovery induced a significant rise in muscle precursor cells and regeneration events along with reduced SC activation expression markers and a concomitant rise in terminal muscle differentiation expression. These are novel findings of potential applicability for the treatment of disuse muscle atrophy, which is commonly associated with severe chronic and acute conditions.
机译:减少肌肉活动会导致肌肉萎缩和功能丧失的病人和动物模型。卫星细胞(SCs)产后肌肉干细胞在骨骼肌细胞发挥关键的作用再生后受伤。潜力,卫星细胞数量,和标记在复苏后的固定下肢7天进行了探讨。下肢固定的暴露于7天那些暴露于复苏(7天,夹板删除),侧控制肌肉,肌肉前体细胞是与世隔绝的后肢肌肉(荧光激活细胞排序、流式细胞仪)和SCs和肌肉再生确定了使用免疫荧光(腓肠肌和比目鱼肌)和电子显微镜(EM,腓肠肌)。ki67、pax7 myoD, myogenin量化从SC流式细胞仪(RT PCR)应承担的产量。强度测定。下肢固定,SCs下降(流式细胞仪,免疫荧光)和一个一起观察upregulation SC激活的标记和标志的肌肉再生包括融合现有的肌纤维(EM)。下肢固定由一个特征程序的肌肉再生的事件。固定诱导SCs一起下降的upregulation SC激活的标志,这表明融合到现有的肌纤维发生在卸货。诱导肌肉前体含量显著升高细胞和再生事件减少SC激活标记和一个表达式伴随的终端增加肌肉微分表达式。发现潜在的适用性停止使用的治疗肌肉萎缩,这是常伴有严重的慢性和急性条件。

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