Angiogenin Defines Heterogeneity at the Core of the Hematopoietic Niche

Successful hematopoietic regeneration demands preservation of stemness while enabling expansion and differentiation into blood lineages. Now, Silberstein et al. (2016) and Goncalves et al. (2016) identify a ribonuclease secreted by proximal niche cells that simultaneously drives quiescence of HSCs and proliferation of myeloid progenitors and dramatically enhances hematopoietic recovery after HSC transplantation. Successful hematopoietic regeneration demands preservation of stemness while enabling expansion and differentiation into blood lineages. Now, Silberstein et al. (2016) and Goncalves et al. (2016) identify a ribonuclease secreted by proximal niche cells that simultaneously drives quiescence of HSCs and proliferation of myeloid progenitors and dramatically enhances hematopoietic recovery after HSC transplantation.