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KMID : 0366220170520010025
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Korean Journal of Hematology
2017 Volume.52 No. 1 p.25 ~ p.30
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Elevated expression of DNMT1 is associated with increased expansion and proliferation of hematopoietic stem cells co-cultured with human MSCs
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Ahmadnejad Moharram
Amirizadeh Naser
Mehrasa Roya
Karkhah Ahmad
Nikougoftar Mahin
Oodi Arezoo
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Abstract
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Background: Mesenchymal stem cells (MSCs) play an important role in hematopoietic stem cell (HSC) maintenance, proliferation, and apoptosis. DNA methyltransferase 1 (DNMT1) is considered an essential factor in the maintenance of HSCs in mammalian cells. Therefore, this study was conducted to evaluate the mRNA expression level of DNMT1 during cord blood (CB)-HSC ex vivo expansion with MSCs.
Methods: Ex vivo cultures of CB-HSCs were performed in three culture conditions for 7 days: cytokines, cytokines with MSCs, and only MSCs. Total and viable cell numbers were counted after 5 and 7 days using trypan blue stain, and the stem cell percentage was then evaluated by flow cytometry. Moreover, in vitro colony-forming unit assay was carried out to detect clonogenic potential of HSCs at days 0 and 7 using MethoCult H4434. Finally, DNMT1 mRNA expression level was evaluated by real-time polymerase chain reaction.
Results: Maximum CB-CD34+ cell expansion was observed on day 7 in all the three cultures. After 7 days, ex vivo expansion of CB-CD34+ cells indicated a significant decrease in DNMT1 expression in the cytokine cultures, whereas in the two co-culture conditions DNMT1 expression was increased. A significant difference between the number of CD34+ and CD34? cells in the cytokine co-culture system was observed.
Conclusion: These data indicated that an elevated expression of DNMT1 is associated with increased expansion and proliferation of HSCs co-cultured with human MSCs. Hence, DNMT1 may be a potential factor in the maintenance of expanded HSCs co-cultured with human MSCs.
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KEYWORD
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DNA methyltransferase 1, HSCs, MSCs, Co-culture, Ex vivo expansion, Cytokines
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