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논문 기본 정보

자료유형
학술저널
저자정보
Moharram Ahmadnejad (Blood Transfusion Research Center) Naser Amirizadeh (Blood Transfusion Research Center) Roya Mehrasa (Blood Transfusion Research Center) Ahmad Karkhah (Babol University of Medical Sciences) Mahin Nikougoftar (Blood Transfusion Research Center) Arezoo Oodi (Blood Transfusion Research Center)
저널정보
대한혈액학회 Blood Research Blood Research Vol.52 No.1
발행연도
2017.1
수록면
25 - 30 (6page)

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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 consid-ered 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: cyto-kines, 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 ex-pression 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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