Tendon-derived stem/progenitor cell aging: Defective self-renewal and altered fate

Zuping Zhou, Takintope Akinbiyi, Lili Xu, Melissa Ramcharan, Daniel J. Leong, Stephen J. Ros, Alexis C. Colvin, Mitchell B. Schaffler, Robert J. Majeska, Evan L. Flatow, Hui B. Sun

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

Aging is a major risk factor for tendon injury and impaired tendon healing, but the basis for these relationships remains poorly understood. Here we show that rat tendon-derived stem/progenitor cells (TSPCs) differ in both self-renewal and differentiation capability with age. The frequency of TSPCs in tendon tissues of aged animals is markedly reduced based on colony formation assays. Proliferation rate is decreased, cell cycle progression is delayed and cell fate patterns are also altered in aged TSPCs. In particular, expression of tendon lineage marker genes is reduced while adipocytic differentiation increased. Cited2, a multi-stimuli responsive transactivator involved in cell growth and senescence, is also downregulated in aged TSPCs while CD44, a matrix assembling and organizing protein implicated in tendon healing, is upregulated, suggesting that these genes participate in the control of TSPC function.

Original languageEnglish (US)
Pages (from-to)911-915
Number of pages5
JournalAging cell
Volume9
Issue number5
DOIs
StatePublished - Oct 2010

Keywords

  • Aging
  • CD44
  • Cited2
  • Differentiation
  • Self-renewal
  • Tendon-derived stem/progenitor cells

ASJC Scopus subject areas

  • Aging
  • Cell Biology

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