Efficient hematopoietic stem cell (HSC) homing is important for hematopoietic cell transplantation (HCT), especially when HSC numbers are limited, as in the use of cord blood (CB). In a screen of small-molecule compounds, we identified glucocorticoid (GC) hormone signaling as an activator of CXCR4 expression in human CB HSCs and hematopoietic progenitor cells (HPCs). Short-term GC pretreatment of human CB HSCs and HPCs promoted SDF-1–CXCR4-axis-mediated chemotaxis, homing, and long-term engraftment when these cells were transplanted into primary- and secondary-recipient NSG mice. Mechanistically, activated glucocorticoid receptor binds directly to a glucocorticoid response element in the CXCR4 promoter and recruits the SRC-1–p300 complex to promote H4K5 and H4K16 histone acetylation, facilitating transcription of CXCR4. These results suggest a new and readily available means to enhance the clinical efficacy of CB HCT.
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We thank other members in the Broxmeyer laboratory for helpful discussion and assistance and A.L. Sinn from the In vivo Therapeutics Core of the Indiana University School of Medicine for transplantation assistance. This work was supported by US Public Health Service Grants from the NIH to H.E.B. (R01 HL112669, R01 HL056416, U54 DK106846).
H.E.B. is a member of the Medical Scientific Advisory Board of CordUse, a cord blood banking company based in Orlando, Florida.
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