HIF-1α-stabilizing agent FG-4497 rescues human CD34+ cell mobilization in response to G-CSF in immunodeficient mice.

Abstract:

:Granulocyte colony-stimulating factor (G-CSF) is used routinely in the clinical setting to mobilize hematopoietic stem progenitor cells (HSPCs) into the patient's blood for collection and subsequent transplantation. However, a significant proportion of patients who have previously received chemotherapy or radiotherapy and require autologous HSPC transplantation cannot mobilize the minimal threshold of mobilized HSPCs to achieve rapid and successful hematopoietic reconstitution. Although several alternatives to the G-CSF regime have been tested, few are used in the clinical setting. We have shown previously in mice that administration of prolyl 4-hydroxylase domain enzyme (PHD) inhibitors, which stabilize hypoxia-inducible factor (HIF)-1α, synergize with G-CSF in vivo to enhance mouse HSPC mobilization into blood, leading to enhanced engraftment via an HSPC-intrinsic mechanism. To evaluate whether PHD inhibitors could be used to enhance mobilization of human HSPCs, we humanized nonobese, diabetic severe combined immune-deficient Il2rg-/- mice by transplanting them with human umbilical cord blood CD34+ HSPCs and then treating them with G-CSF with and without co-administration of the PHD inhibitor FG-4497. We observed that combination treatment with G-CSF and FG-4497 resulted in significant mobilization of human lineage-negative (Lin-) CD34+ HSPCs and more primitive human Lin-CD34+CD38- HSPCs into blood and spleen, whereas mice treated with G-CSF alone did not mobilize human HSPCs significantly. These results suggest that the PHD inhibitor FG-4497 also increases human HSPC mobilization in a xenograft mouse model, suggesting the possibility of testing PHD inhibitors to boost HSPC mobilization in response to G-CSF in humans.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Nowlan B,Futrega K,Brunck ME,Walkinshaw G,Flippin LE,Doran MR,Levesque JP

doi

10.1016/j.exphem.2017.05.004

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

50-55.e6

eissn

0301-472X

issn

1873-2399

pii

S0301-472X(17)30147-9

journal_volume

52

pub_type

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