Genome-wide Expression Profiles of Necrotizing Enterocolitis Versus Spontaneous Intestinal Perforation in Human Intestinal Tissues
2013/12/24 by Kathy Yuen Yee Chan, Kam Tong Leung, Yuk Him Tam +9 · 25 citations
Nursing · Medicine · Immunology and Microbiology · #Infant Nutrition and Health #Preterm Birth and Chorioamnionitis #Inflammation biomarkers and pathways
paper · doi:10.1097/sla.0000000000000374
Abstract
In Brief Objective: To provide a comprehensive database of gene regulation and compare differentially regulated molecular networks in human tissues of necrotizing enterocolitis (NEC) and spontaneous intestinal perforation (SIP). Background: Both NEC and SIP are devastating surgical emergencies associated with high morbidity and mortality in preterm infants. Their pathophysiology and molecular mechanisms remain unclear. Methods: Differential whole genome microarray analysis was performed on intestinal tissues collected from NEC (n = 15) and SIP (n = 12) infants and compared with tissues collected from surgical-control patients with noninflammatory intestinal conditions (n = 14). Validation of 52 target gene expressions was performed by quantitative polymerase chain reaction. Regulatory networks of significantly affected genes were constructed according to functional pathways. Results: Extensive and significant changes of gene expression were observed in NEC tissues, which comprised multiple pathways of angiogenesis, arginine metabolism, cell adhesion and chemotaxis, extracellular matrix remodeling, hypoxia and oxidative stress, inflammation, and muscle contraction. These dysregulated genes could be networked downstream of key receptors, TLR2, TLR4, and TREM1, and mediated via NF-κB, AP-1, and HIF1A transcription factor pathways, indicating predominant microbial and inflammatory involvement. In contrast, SIP tissues exhibited much milder and less diversified expressional changes, with target genes significantly associated with G-protein–mediated muscle contraction and extracellular matrix remodeling. Conclusions: The molecular evidence suggests that NEC and SIP are likely 2 different diseases caused by distinct etiology and pathophysiology. This first comprehensive database on differential gene expression profiles of human NEC and SIP tissues could lead to development of disease-specific diagnostic and prognostic biomarkers and new therapeutic strategies for improving outcomes. This study presented the first microarray profiles of human necrotizing enterocolitis (NEC) and spontaneous intestinal perforation (SIP) tissues and validated 52 genes that were differentially expressed. Network analysis demonstrated interacting pathways downstream of key receptors and transcription factors. The molecular evidence revealed that NEC and SIP are likely different diseases with distinct etiology and pathophysiology.
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