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Glycine Enhances Satellite Cell Proliferation, Cell Transplantation, and Oligonucleotide Efficacy in Dystrophic Muscle.
Molecular Therapy ( IF 12.1 ) Pub Date : 2020-03-10 , DOI: 10.1016/j.ymthe.2020.03.003
Caorui Lin 1 , Gang Han 2 , Hanhan Ning 1 , Jun Song 1 , Ning Ran 1 , Xianfu Yi 3 , Yiqi Seow 4 , HaiFang Yin 1
Affiliation  

The need to distribute therapy evenly systemically throughout the large muscle volume within the body makes Duchenne muscular dystrophy (DMD) therapy a challenge. Cell and exon-skipping therapies are promising but have limited effects, and thus enhancing their therapeutic potency is of paramount importance to increase the accessibility of these therapies to DMD patients. In this study, we demonstrate that co-administered glycine improves phosphorodiamidate morpholino oligomer (PMO) potency in mdx mice with marked functional improvement and an up to 50-fold increase of dystrophin in abdominal muscles compared to PMO in saline. Glycine boosts satellite cell proliferation and muscle regeneration by increasing activation of mammalian target of rapamycin complex 1 (mTORC1) and replenishing the one-carbon unit pool. The expanded regenerating myofiber population then results in increased PMO uptake. Glycine also augments the transplantation efficiency of exogenous satellite cells and primary myoblasts in mdx mice. Our data provide evidence that glycine enhances satellite cell proliferation, cell transplantation, and oligonucleotide efficacy in mdx mice, and thus it has therapeutic utility for cell therapy and drug delivery in muscle-wasting diseases.

中文翻译:

甘氨酸增强营养不良性肌肉中的卫星细胞增殖,细胞移植和寡核苷酸功效。

在全身的大块肌肉中均匀分布治疗方法的需求使Duchenne肌营养不良症(DMD)治疗成为一个挑战。细胞和外显子跳过疗法是有前途的,但作用有限,因此提高其治疗效力对于增加这些疗法对DMD患者的可及性至关重要。在这项研究中,我们证明,与盐水中的PMO相比,共同给药的甘氨酸可改善mdx小鼠中的二氨基磷酸吗啉代吗啉代低聚物(PMO)效能,并具有显着的功能性改善和肌营养不良蛋白的最高50倍增加。甘氨酸通过增加哺乳动物对雷帕霉素复合物1(mTORC1)的激活并补充单碳单位池来促进卫星细胞增殖和肌肉再生。然后,再生的肌纤维群体的扩大导致PMO摄取增加。甘氨酸还提高了外源卫星细胞和原代成肌细胞在mdx小鼠中的移植效率。我们的数据提供了证据,表明甘氨酸增强了mdx小鼠的卫星细胞增殖,细胞移植和寡核苷酸功效,因此,它在肌肉萎缩性疾病的细胞治疗和药物递送中具有治疗作用。
更新日期:2020-03-10
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