Gcn2 deficiency alters the balance between T-cell activation and suppression leading to inflammation

The article discusses the role of the GCN2 gene in hereditary pulmonary veno-occlusive disease (hPVOD), a severe form of pulmonary hypertension. The study involved generating rat lines with biallelic Gcn2 mutations, which were found to be phenotypically normal and did not spontaneously develop PVOD-related disease. The researchers then subjected these rats to amino acid deprivation to observe the molecular and cellular response of the lungs and to identify phenotypic changes that could be involved in PVOD pathophysiology. The results showed that Gcn2-deficient rats displayed molecular and cellular signatures in the lungs that may indicate a role for Gcn2 in immune homeostasis and provide further clues to the mechanisms of hPVOD development. Specifically, under basal and asparagine and glutamine deprivation induced by asparaginase administration, Gcn2-deficient rats showed increases in proinflammatory and innate immunity genes, as well as T cell populations and neutrophil infiltration.