Re-entry into quiescence protects hematopoietic stem cells from the killing effect of chronic exposure to type I interferons.

ABSTRACT: Type I interferons (IFN-1s) are antiviral cytokines that suppress blood production while paradoxically inducing hematopoietic stem cell (HSC) proliferation. Here, we clarify the relationship between the proliferative and suppressive effects of IFN-1s on HSC function during acute and chronic IFN-1 exposure. We show that IFN-1-driven HSC proliferation is a transient event resulting from a brief relaxation of quiescence-enforcing mechanisms in response to acute IFN-1 exposure, which occurs exclusively in vivo. We find that this proliferative burst fails to exhaust the HSC pool, which rapidly returns to quiescence in response to chronic IFN-1 exposure. Moreover, we demonstrate that IFN-1-exposed HSCs with reestablished quiescence are largely protected from the killing effects of IFNs unless fo

SUBMITTER: Pietras EM 

PROVIDER: S-EPMC3920566 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature