Open AccessTendon‐derived stem/progenitor cell aging: defective self‐renewal and altered fate
Author(s) -
Zhou Zuping,
Akinbiyi Takintope,
Xu Lili,
Ramcharan Melissa,
Leong Daniel J.,
Ros Stephen J.,
Colvin Alexis C.,
Schaffler Mitchell B.,
Majeska Robert J.,
Flatow Evan L.,
Sun Hui B.
Publication year - 2010
Publication title -
aging cell
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.103
H-Index - 140
eISSN - 1474-9726
pISSN - 1474-9718
DOI - 10.1111/j.1474-9726.2010.00598.x
Subject(s) - biology , progenitor cell , microbiology and biotechnology , tendon , stem cell , transactivation , senescence , progenitor , cell fate determination , genetics , anatomy , transcription factor , gene
Summary 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.