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KMID : 1377020170140040421
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Tissue Engineering and Regenerative Medicine
2017 Volume.14 No. 4 p.421 ~ p.432
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Low-Dose Ionizing γ-Radiation Promotes Proliferation of Human Mesenchymal Stem Cells and Maintains Their Stem Cell Characteristics
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Cho Whee-Moon
Kim E Ske
Kang Chang-Mo
Ji Young-Hoon
Kim Jong-Il
Park Sang-Jun
Son Young-Sook
Kim Chun-Ho
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Abstract
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Mesenchymal stem cells (MSCs), which are multipotent and have self-renewal ability, support the regeneration of damaged normal tissue. A number of external stimuli promote migration of MSCs into peripheral blood and support their participation in wound healing. In an attempt to harness the potential beneficial effects of such external stimuli, we exposed human MSCs (hMSCs) to one such stimulus?low-dose ionizing radiation (LDIR)?and examined their biological properties. To this end, we evaluated differences in proliferation, cell cycle, DNA damage, expression of surface markers (CD29, CD34, CD90, and CD105), and differentiation potential of hMSCs before and after irradiation with γ-rays generated using a 137CS irradiator. At doses less than 50 mGy, LDIR had no significant effect on the viability or apoptosis of hMSCs. Interestingly, 10 mGy of LDIR increased hMSC viability by 8% (p < 0.001) compared with non-irradiated hMSCs. At doses less than 50 mGy, LDIR did not induce DNA damage, including DNA strand breaks, or cause cellular senescence or cell-cycle arrest. Surface marker expression and in vitro differentiation potential of hMSCs were maintained after two exposures to LDIR at 10 mGy per dose. In conclusion, a two-dose exposure to LDIR at 10 mGy per dose not only facilitates proliferation of hMSCs, it also maintains the stem cell characteristics of hMSCs without affecting their viability. These results provide evidence for the potential of LDIR as an external stimulus for in vitro expansion of hMSCs and application in tissue engineering and regenerative medicine.
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KEYWORD
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Low dose ionizing radiation, Human mesenchymal stem cells, Proliferation, DNA damages, Differentiation
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