1. p16(INK4A) mediates age-related changes in mesenchymal stem cells derived from human dental pulp through the DNA damage and stress response.
- Author
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Feng X, Xing J, Feng G, Huang D, Lu X, Liu S, Tan W, Li L, and Gu Z
- Subjects
- Adolescent, Adult, Aging pathology, Child, Child, Preschool, Dental Pulp pathology, Female, Gene Expression Regulation, Humans, Male, Mesenchymal Stem Cells pathology, Middle Aged, Signal Transduction, Aging metabolism, Cellular Senescence, Cyclin-Dependent Kinase Inhibitor p16 metabolism, DNA Damage, Dental Pulp metabolism, Mesenchymal Stem Cells metabolism
- Abstract
Mesenchymal stem cells derived from human dental pulp (DP-MSCs) are characterized by self-renewal and multi-lineage differentiation, which play important roles in regenerative medicine. Autologous transfers, as non-immunogenic, constitute the safest approach in cellular transplantations. However, their use may be limited by age-related changes. In the study, we compared DP-MSCs isolated from human in five age groups: 5-12 y, 12-20 y, 20-35 y, 35-50 y, and >50 y. We tested the effect of age on proliferation, differentiation, senescence-associated β-galactosidase (SA-β-gal), cell cycle and programmed cell death. DP-MSCs showed characteristics of senescence as a function of age. Meanwhile, the expression of p16(INK4A) and γ-H2A.X significantly increased with age, whereas heat shock protein 60 (HSP60) was decreased in the senescent DP-MSCs. Reactive oxygen species (ROS) staining showed the number of ROS-stained cells and the DCFH fluorescent level were higher in the aged group. Further we examined the senescence of DP-MSCs after modulating p16(INK4A) signaling. The results indicated the dysfunction of DP-MSCs was reversed by p16(INK4A) siRNA. In summary, our study indicated p16(INK4A) pathway may play a critical role in DP-MSCs age-related changes and the DNA damage response (DDR) and stress response may be the main mediators of DP-MSCs senescence induced by excessive activation of p16(INK4A) signaling., (Copyright © 2014. Published by Elsevier Ireland Ltd.)
- Published
- 2014
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