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Moderate exercise mitigates the detrimental effects of aging on tendon stem cells

Zhang, J and Wang, JHC (2015) Moderate exercise mitigates the detrimental effects of aging on tendon stem cells. PLoS ONE, 10 (6).

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Aging is known to cause tendon degeneration whereas moderate exercise imparts beneficial effects on tendons. Since stem cells play a vital role in maintaining tissue integrity, in this study we aimed to define the effects of aging and moderate exercise on tendon stem/progenitor cells (TSCs) using in vitro and in vivo models. TSCs derived from aging mice (9 and 24 months) proliferated significantly slower than TSCs obtained from young mice (2.5 and 5 months). In addition, expression of the stem cell markers Oct-4, nucleostemin (NS), Sca-1 and SSEA-1 in TSCs decreased in an age-dependent manner. Interestingly, moderate mechanical stretching (4%) of aging TSCs in vitro significantly increased the expression of the stem cell marker, NS, but 8% stretching decreased NS expression. Similarly, 4% mechanical stretching increased the expression of Nanog, another stem cell marker, and the tenocyte-related genes, collagen I and tenomodulin. However, 8% stretching increased expression of the non-tenocyte-related genes, LPL, Sox-9 and Runx-2, while 4% stretching had minimal effects on the expression of these genes. In the in vivo study, moderate treadmill running (MTR) of aging mice (9 months) resulted in the increased proliferation rate of aging TSCs in culture, decreased lipid deposition, proteoglycan accumulation and calcification, and increased the expression of NS in the patellar tendons. These findings indicate that while aging impairs the proliferative ability of TSCs and reduces their stemness, moderate exercise can mitigate the deleterious effects of aging on TSCs and therefore may be responsible for decreased aging-induced tendon degeneration.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Zhang, Jjianying@pitt.eduJIANYING
Wang, JHCwanghc@pitt.eduWANGHC
ContributionContributors NameEmailPitt UsernameORCID
Date: 18 June 2015
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: PLoS ONE
Volume: 10
Number: 6
DOI or Unique Handle: 10.1371/journal.pone.0130454
Institution: University of Pittsburgh
Schools and Programs: School of Medicine > Orthopaedic Surgery
Swanson School of Engineering > Bioengineering
Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
Date Deposited: 28 Jun 2016 16:35
Last Modified: 30 Mar 2021 14:55


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