Substrate elasticity regulates skeletal muscle stem cell self-renewal in culture.

Substrate elasticity regulates skeletal muscle stem cell self-renewal in culture.
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DOI:
10.1126/science.1191035
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发表时间:
2010-08-27
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Blau HM
Blau HM
中科院分区:
其他
文献类型:
--
作者:
Gilbert PM;Havenstrite KL;Magnusson KE;Sacco A;Leonardi NA;Kraft P;Nguyen NK;Thrun S;Lutolf MP;Blau HM

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新鲜分离的肌肉干细胞(MuSCs)在体内表现出强大的再生能力,但在培养过程中会迅速丧失。使用生物工程底物来概括关键的生物物理和生化生态位特征,结合一种新的高度自动化的单细胞跟踪算法,我们证明了底物弹性是MUSC在培养中命运的有效调节因素。与硬质塑料培养皿(~106kPa)上的MuSCs不同,在软水凝胶基质上培养的MuSCs可以模拟肌肉(12kPa)的弹性在体外自我更新,并在随后移植到小鼠体内时对肌肉再生做出广泛贡献,并通过非侵入性生物发光成像进行组织学和定量检测。我们的研究提供了新的证据,表明通过概括生理组织刚性,成年肌肉干细胞的繁殖是可能的,从而使未来基于细胞的治疗肌肉萎缩疾病成为可能。
Freshly isolated muscle stem cells (MuSCs) exhibit robust regenerative capacity in vivo that is rapidly lost in culture. Using a bioengineered substrate to recapitulate key biophysical and biochemical niche features in conjunction with a novel highly automated single cell tracking algorithm, we show that substrate elasticity is a potent regulator of MuSC fate in culture. Unlike MuSCs on rigid plastic dishes (~106kPa), MuSCs cultured on soft hydrogel substrates that mimic the elasticity of muscle (12kPa) self-renew in vitro and contribute extensively to muscle regeneration when subsequently transplanted into mice and assayed histologically and quantitatively by non-invasive bioluminescence imaging. Our studies provide novel evidence that by recapitulating physiological tissue rigidity, propagation of adult muscle stem cells is possible, enabling future cell-based therapies for muscle wasting diseases.
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