RelB regulates human dendritic cell subset development by promoting monocyte intermediates.
In humans, epithelial Langerhans cells (LCs) and monocyte-derived/interstitial dendritic cells (DCs) constitute 2 myeloid DC sublineages. Molecular mechanisms involved in their development from common myeloid progenitors remain poorly defined. Here we demonstrate that the nuclear factor-kappaB (NF-kappaB) transcription factor RelB regulates the generation of monocytic CD14(+)CD11b(+) precursors of interstitial DCs from human hematopoietic progenitors. RelB overexpression promoted, whereas endogenous RelB inhibition (by p100DeltaN) blocked, precursor cell development along this DC subset pathway. RelB inhibition specifically arrested precursor progression from CD14(lo)CD11b(-) to CD14(+)CD11b(+) stages. Precursors were still capable of LC and granulocyte differentiation but were defective in macrophage-colony-stimulating factor (M-CSF)-dependent monocyte/macrophage differentiation. RelB inhibition markedly differed from classical NF-kappaB signaling inhibition because IkappaBalpha superrepressor (IkappaBalpha-SR), but not p100DeltaN, impaired LC/DC differentiation, DC adhesion, and progenitor cell proliferation. Although RelB up-regulation and nuclear translocation are regarded as hallmarks of human myeloid DC maturation, ectopic RelB overexpression failed to promote DC maturation. Our results suggest that RelB regulates human monopoiesis and monocyte-derived DC subset development.
Institute of Immunology, University of Vienna, A-1235, Brunnerstrasse 59, Vienna, Austria.
Barbara
B
Platzer
Almut
A
Jörgl
Sabine
S
Taschner
Bernhard
B
Höcher
Herbert
H
Strobl
D002448:Cell Adhesion; D002454:Cell Differentiation; D019070:Cell Lineage; D049109:Cell Proliferation; D003713:Dendritic Cells / Q000166:cytology*; D006412:Hematopoietic Stem Cells / Q000166:cytology; D006801:Humans; D020672:I-kappa B Proteins / Q000494:pharmacology; D009000:Monocytes / Q000166:cytology*; D023461:Myeloid Progenitor Cells / Q000166:cytology; D000072000:NF-KappaB Inhibitor alpha; D011518:Proto-Oncogene Proteins / Q000502:physiology*; D051841:Transcription Factor RelB; D014157:Transcription Factors / Q000502:physiology*
D020672:I-kappa B Proteins; C000606204:NFKBIA protein, human; D011518:Proto-Oncogene Proteins; C497593:RELB protein, human; D014157:Transcription Factors; D000072000:NF-KappaB Inhibitor alpha; D051841:Transcription Factor RelB