C/EBPß regulates lipid metabolism and Pparg isoform 2 expression in alveolar macrophages.
Sci Immunol
; 7(75): eabj0140, 2022 09 16.
Article
in En
| MEDLINE
| ID: mdl-36112694
Pulmonary alveolar proteinosis (PAP) is a syndrome characterized by accumulation of surfactant lipoproteins within the lung alveoli. Alveolar macrophages (AMs) are crucial for surfactant clearance, and their differentiation depends on colony-stimulating factor 2 (CSF2), which regulates the establishment of an AM-characteristic gene regulatory network. Here, we report that the transcription factor CCAAT/enhancer binding protein ß (C/EBPß) is essential for the development of the AM identity, as demonstrated by transcriptome and chromatin accessibility analysis. Furthermore, C/EBPß-deficient AMs showed severe defects in proliferation, phagocytosis, and lipid metabolism, collectively resulting in a PAP-like syndrome. Mechanistically, the long C/EBPß protein variants LAP* and LAP together with CSF2 signaling induced the expression of Pparg isoform 2 but not Pparg isoform 1, a molecular regulatory mechanism that was also observed in other CSF2-primed macrophages. These results uncover C/EBPß as a key regulator of AM cell fate and shed light on the molecular networks controlling lipid metabolism in macrophages.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pulmonary Surfactants
/
Macrophages, Alveolar
Language:
En
Journal:
Sci Immunol
Year:
2022
Document type:
Article