Professional Education
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Doctor of Philosophy, University of California Berkeley (2015)
Daniel Isaac Benjamin
Postdoctoral Research Fellow, Neurology and Neurological Sciences
Bio
Publications
All Publications
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Exercise rejuvenates quiescent skeletal muscle stem cells in old mice through restoration of Cyclin D1
NATURE METABOLISM
2020; 2 (4): 307-+
View details for DOI 10.1038/s42255-020-0190-0
View details for Web of Science ID 000536044100005
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Exercise rejuvenates quiescent skeletal muscle stem cells in old mice through restoration of Cyclin D1.
Nature metabolism
2020; 2 (4): 307?17
Abstract
Aging impairs tissue repair. This is pronounced in skeletal muscle, whose regeneration by muscle stem cells (MuSCs) is robust in young adult animals but inefficient in older organisms. Despite this functional decline, old MuSCs are amenable to rejuvenation through strategies that improve the systemic milieu, such as heterochronic parabiosis. One such strategy, exercise, has long been appreciated for its benefits on healthspan, but its effects on aged stem cell function in the context of tissue regeneration are incompletely understood. Here we show that exercise in the form of voluntary wheel running accelerates muscle repair in old animals and improves old MuSC function. Through transcriptional profiling and genetic studies, we discovered that the restoration of old MuSC activation ability hinges on restoration of Cyclin D1, whose expression declines with age in MuSCs. Pharmacologic studies revealed that Cyclin D1 maintains MuSC activation capacity by repressing TGF? signaling. Taken together, these studies demonstrate that voluntary exercise is a practicable intervention for old MuSC rejuvenation. Furthermore, this work highlights the distinct role of Cyclin D1 in stem cell quiescence.
View details for DOI 10.1038/s42255-020-0190-0
View details for PubMedID 32601609
View details for PubMedCentralID PMC7323974
