Journal
IMMUNITY
Volume 32, Issue 5, Pages 628-641Publisher
CELL PRESS
DOI: 10.1016/j.immuni.2010.05.005
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Funding
- National Health and Medical Research Council (NHMRC) of Australia
- Australian Research Council
- Leukaemia Foundation
- University of Melbourne
- Pfizer
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The transcription factor PU.1 plays multiple context and concentration dependent roles in lymphoid and myeloid cell development. Here we showed that PU.1 (encoded by Sfpi1) was essential for dendritic cell (DC) development in vivo and that conditional ablation of PU.1 in defined precursors, including the common DC progenitor, blocked Flt3 ligand-induced DC generation in vitro. PU.1 was also required for the parallel granulocyte-macrophage colony stimulating factor-induced DC pathway from early hematopoietic progenitors. Molecular studies demonstrated that PU.1 directly regulated Flt3 in a concentration-dependent manner, as Sfpi1(+/-) cells displayed reduced expression of Flt3 and impaired DC formation. These studies identify PU.1 as a critical regulator of both conventional and plasmacytoid DC development and provide one mechanism how altered PU.1 concentration can have profound functional consequences for hematopoietic cell development.
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