Prospective Isolation of Skeletal Muscle Stem Cells with a Pax7 Reporter

被引:121
作者
Bosnakovski, Darko [1 ,2 ]
Xu, Zhaohui [3 ]
Li, Wei [3 ]
Thet, Suwannee [3 ]
Cleaver, Ondine [4 ]
Perlingeiro, Rita C. R. [1 ,2 ]
Kyba, Michael [1 ,2 ]
机构
[1] Univ Minnesota, Lillehei Heart Inst, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Pediat, Minneapolis, MN 55455 USA
[3] Univ Texas SW Med Ctr Dallas, Dept Dev Biol, Dallas, TX 75390 USA
[4] Univ Texas SW Med Ctr Dallas, Dept Mol Biol, Dallas, TX 75390 USA
关键词
Pax7; Experimental models; Muscle stem cells; Muscular dystrophy;
D O I
10.1634/stemcells.2007-1017
中图分类号
Q813 [细胞工程];
学科分类号
摘要
Muscle regeneration occurs through activation of quiescent satellite cells whose progeny proliferate, differentiate, and fuse to make new myofibers. We used a transgenic Pax7-ZsGreen reporter mouse to prospectively isolate stem cells of skeletal muscle by flow cytometry. We show that Pax7-expressing cells (satellite cells) in the limb, head, and diaphragm muscles are homogeneous in size and granularity and uniformly labeled by certain cell surface markers, including CD34 and CD29. The frequency of the satellite cells varies between muscle types and with age. Clonal analysis demonstrated that all colonies arising from single cells within the Pax7-sorted fraction have myogenic potential. In response to injury, Pax7(+) cells reduce CD34, CD29, and CXCR4 expression, increase in size, and acquire Sca-1. When directly isolated and cultured in vitro, Pax7(+) cells display the hallmarks of activation and proliferate, initially as suspension aggregates and later distributed between suspension and adherence. During in vitro expansion, Pax7 (ZsGreen) and CD34 expression decline, whereas expression of PSA-NCAM is acquired. The nonmyogenic, Pax7(neg) cells expand as Sca1(+) PDGR alpha(+) PSA-NCAM(neg) cells. Satellite cells expanded exclusively in suspension can engraft and produce dystrophin(+) fibers in mdx(-/-) mice. These results establish a novel animal model for the study of muscle stem cell physiology and a culture system for expansion of engraftable muscle progenitors. STEM CELLS 2008;26:3194-3204
引用
收藏
页码:3194 / 3204
页数:11
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