A high dimensionality approach reveals immunopathogenic responses driving severe pediatric acute respiratory distress syndrome - PubMed
2 days ago
- #pediatric acute respiratory distress syndrome
- #immune dysregulation
- #interferon-driven pathology
- Severe pediatric acute respiratory distress syndrome (PARDS) involves three key immune abnormalities in the lung: CD8+ T cells show an interferon-driven cytotoxic profile with exhaustion and apoptosis genes, T cells and myeloid cells exhibit strong interferon-stimulated gene expression, and distinct macrophage subsets have high interferon but suppressed IL-1 pathway genes, linked to impaired functions like phagocytosis.
- In PARDS patients, pulmonary IL-1α/β levels are reduced while IFN-γ is elevated; systemic IL-1 signatures are dampened, but interferon responses are compartmentalized to the lung.
- In vitro modeling demonstrates that IFN-γ priming suppresses TLR7-induced IL-1β production by inhibiting downstream inflammatory pathways, mirroring the immune signature observed in severe PARDS.
- The findings highlight interferon-driven immune dysregulation and IL-1 suppression as central features of severe PARDS, emphasizing differences from adult ARDS and the need for pediatric-specific therapeutic strategies.