Endothelin receptor B affects the perfusion of newborn intestine: possible mechanism of necrotizing enterocolitis development
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In brief
In brief
Study demonstrates that partial knockout of endothelin receptor B (EDNRB) in mice reduces NEC severity and tissue hypoxia, suggesting EDNRB plays a key role in regulating intestinal perfusion during neonatal intestinal injury. Findings provide mechanistic insight into NEC pathophysiology and potential therapeutic targets.
Written by the GCMD Library team from the article.
Abstract
Background
Necrotizing enterocolitis (NEC) is one of the most severe gastrointestinal diseases in infancy. Hypoxia is known as one of the major risk factors for the development of NEC. Endothelin, known to regulate vasoconstriction, has two receptors (A and B). However, the role of endothelin receptor B (EDNRB) in neonatal intestinal injury remains unclear. We aimed to investigate whether EDNRB is involved in NEC pathophysiology.
Methods
Following ethical approval (#44032), EDNRB hetero knockout mice pups (EDNRB±) and their wild-type (WT) littermates were studied. NEC was induced from postnatal day 5–9 (P5–P9) by hypoxia, gavage feeding of formula and administration of lipopolysaccharide. On P9, the ileum was harvested.
Results
NEC induction in WT mice was associated with mucosal injury. However, EDNRB± NEC mice had reduced mucosal injury. Similarly, EDNRB± mice had significantly lower expression of IL-6 mRNA compared to WT NEC mice. Pimonidazole immunostaining was also significantly lower in EDNRB± compared to WT NEC, suggesting reduced tissue hypoxia.
Conclusions
Partial knockout of EDNRB results in reduced NEC severity and reduced tissue hypoxia. Intestinal perfusion and hypoxia are important elements of NEC pathogenesis. These findings are relevant to the understanding of NEC pathophysiology and to the development of novel preventive strategies for NEC.