Browsing by Author "Jeon, Hyeji"

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    MiR-9 Controls Chemotactic Activity of Cord Blood CD34⁺ Cells by Repressing CXCR4 Expression
    (Korean Society for Stem Cell Research, 2018-11-30) Ha, Tae Won; Kang, Hyun Soo; Kim, Tae-Hee; Kwon, Ji Hyun; Kim, Hyun Kyu; Ryu, Aeli; Jeon, Hyeji; Han, Jaeseok; Broxmeyer, Hal E.; Hwang, Yongsung; Lee, Yun Kyung; Lee, Man Ryul; Microbiology and Immunology, School of Medicine
    Improved approaches for promoting umbilical cord blood (CB) hematopoietic stem cell (HSC) homing are clinically important to enhance engraftment of CB-HSCs. Clinical transplantation of CB-HSCs is used to treat a wide range of disorders. However, an improved understanding of HSC chemotaxis is needed for facilitation of the engraftment process. We found that ectopic overexpression of miR-9 and antisense-miR-9 respectively down- and up-regulated C-X-C chemokine receptor type 4 (CXCR4) expression in CB-CD34＋ cells as well as in 293T and TF-1 cell lines. Since CXCR4 is a specific receptor for the stromal cell derived factor-1 (SDF-1) chemotactic factor, we investigated whether sense miR-9 and antisense miR-9 influenced CXCR4-mediated chemotactic mobility of primary CB CD34＋ cells and TF-1 cells. Ectopic overexpression of sense miR-9 and antisense miR-9 respectively down- and up-regulated SDF-1-mediated chemotactic cell mobility. To our knowledge, this study is the first to report that miR-9 may play a role in regulating CXCR4 expression and SDF-1-mediated chemotactic activity of CB CD34＋ cells.