Abstract
Introduction: Since the 1980s, adipose-derived stem cells (ASCs) have become a powerful and potential source for stem cell-based therapy, regenerative medicine, and even drug delivery in cancer treatment. The development of off-the-shelf mesenchymal stem cells (MSCs), including ASCs, has rapidly advanced in recent years with several clinical trials and approved products. In this technology, ASCs should be expanded long term in order to harvest higher cell number. In this study, senescence of ASCs after long-term expansion was evaluated. Methods: Human ASCs (hASCs) were isolated and cultured continuously at a density of 103 cells/cm2 up to passage 15. The cells were assessed for aging via changes in the following: characteristics of MSCs, mitochondrial activity, accumulation of beta-galactosidase, and expression of tumor suppressor genes. Results: The results showed that following in vitro expansion to the 15th passage, ASCs did not show changes in immunophenotype, except for decreased expression of CD105. However, the cells increased in size and in shape and complexity (toward the “fried egg” morphology). They also almost ceased to proliferate in passage 15. Nonetheless, they maintained in vitro differentiation potential toward osteoblasts, chondrocytes, and adipocytes. Expression of tumor suppressor genes p53 and p16 did not significantly change, while p27 was significantly downregulated. Mitochondrial activities also decreased slightly in culture from passage 5 to passage 10 and remained stable to passage 15. ASCs also showed increased accumulation of beta-galactosidase in culture, but it was negligible. Conclusion: In conclusion, hASCs exhibited some particular characteristics of aged stem cells when the number of subculture cells increased. However, up to passage 10, ASCs also retained almost all of the characteristics of MSCs.
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Abbreviations
- ASCs::
-
Adipose-derived stem cells
- BM-MSCs::
-
Bone marrow-derived mesenchymal stem cells
- CFU-F::
-
Fibroblast colony-forming units
- DE::
-
Germany
- FBS::
-
Fetal bovine serum
- FCM::
-
Flow cytometry
- FSC::
-
Forward scatter
- hASCs::
-
Human adipose-derived stem cells
- iPSCs::
-
Induced pluripotent stem cells
- KR::
-
Korean
- MSCs::
-
Mesenchymal stem cells
- PBS::
-
Phosphate-buffered saline
- ROS::
-
Reactive oxygen species
- SA-β-gal::
-
Senescence-associated β-galactosidase enzyme
- SSC::
-
Side scatter
- SVF::
-
Stromal vascular fraction
- UK::
-
United Kingdom
- USA::
-
United States
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Acknowledgment
This research was supported by Viet Nam National University Ho Chi Minh City via projects Grant No. C2016-18-18 and TX2017-18-02 and by VNUHCM-University of Science via project Grant No. T2017-43.
Authors’ Contributions
NCT, PVP, and KHTB designed the study and read and corrected the manuscript. NCT wrote the manuscript, proliferated hASC samples, and evaluated gene expression, mitochondrial activity, and beta-galactosidase accumulation. NCT, PVP, and KHTB evaluated mesenchymal characteristics. All authors read and approved the final manuscript.
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Truong, N.C., Bui, K.HT., Van Pham, P. (2018). Characterization of Senescence of Human Adipose-Derived Stem Cells After Long-Term Expansion. In: Pham, P. (eds) Tissue Engineering and Regenerative Medicine. Advances in Experimental Medicine and Biology(), vol 1084. Springer, Cham. https://doi.org/10.1007/5584_2018_235
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