The Role of GPX Enzymes, Lipid Profiles, and Iron Accumulation in Necrotizing Enterocolitis

Abstract

Necrotizing enterocolitis (NEC) is a serious GI disease of premature infants, marked by intestinal inflammation and necrosis. Recent research has highlighted the potential role of oxidative stress (OS) and ferroptosis in its pathogenesis. We previously identified a deficiency in Glutathione Peroxidase (GPX) 4 and lipid radical accumulation, prompting further investigation. Human intestinal tissue from a prior study was processed, and it underwent RNA and protein isolation, Immunohistochemistry, Immunofluorescence, and acid digestion for iron and selenium analysis via Inductively coupled mass spectrometry (ICP-MS). NEC was induced in human enteroids using lipopolysaccharide (LPS) and hypoxia, followed by RNA/protein isolation and lipidomic analysis. Humans with NEC had significantly higher levels of GPX2 (p = 0.0003). Enteroids exposed to NEC conditions had significantly decreased amounts of NADPH compared to initial controls (p = 0.0091), but similar levels compared to post-24 h controls (p = 0.3520). Patients with NEC had significantly higher levels of iron compared to controls via the bathophenanthroline-based assay (p = 0.0102) and with ICP-MS (p = 0.0148). There were several significant alterations in lipid distribution between NEC and control patients, but not in the fatty acid profiles. Our study suggests that oxidative stress, iron dysregulation, and altered lipid metabolism contribute to NEC pathogenesis.