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ABSTRACT: Human Milk Peptide Reduces Necrotizing Enterocolitis

PROVIDER: PRJNA1199133 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR31763040_1.fastq.gz	Fastqsanger.gz
	SRR31763040_2.fastq.gz	Fastqsanger.gz
	SRR31763041_1.fastq.gz	Fastqsanger.gz
	SRR31763041_2.fastq.gz	Fastqsanger.gz
	SRR31763042_1.fastq.gz	Fastqsanger.gz

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Project description:Human Milk Peptide Reduces Necrotizing Enterocolitis mRNA

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Project description:Preterm neonates are susceptible to gastrointestinal (GI) disorders such as necrotizing enterocolitis (NEC). Maternal milk, and especially colostrum, protects against NEC via growth promoting, immunomodulatory and antimicrobial factors. The fetal enteral diet, amniotic fluid (AF), contains similar bioactive components and we hypothesized that postnatal AF administration would reduce inflammatory responses and NEC in preterm neonates. Thirty preterm pigs (92% gestation) were delivered by caesarean section and fed total parental nutrition (TPN) for 48 h followed by enteral porcine colostrum (COLOS, n=7), infant formula (FORM, n=13) or formula + porcine AF (AF, n=10). Using a previously validated model of NEC in preterm pigs, we determined the structural, functional, microbiological and immunological responses to AF when administered prior to and after introduction of a suboptimal enteral formula diet. Keywords: Healthy versus inflammed tissues in relation to necrotizing enterocolitis Pigs from each treatment group (COLOS, n=4; FORM, n=6; and AF, n=7) were randomly selected for microarray analysis of frozen distal small intestine samples. The FORM group was further divided into formula-fed healthy pigs (F-HEA, n=3) and formula-fed NEC pigs (F-NEC, n=3) in order to compare sick versus healthy formula fed pigs. Equal amounts of total distal small intestinal RNA from all pigs were pooled to make the reference sample. Samples and reference pool were labelled with Oyster 550 and 650, respectively. The in-house spotted porcine oligonucleotide microarray version 4 (POM4) is a low density microarray consisting of 384 different oligonucleotide probes representing more than 200 different immune related genes.

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Project description:Necrotizing enterocolitis (NEC) is a severe gastrointestinal complication of prematurity. Using small intestinal organoids derived from fetal tissue of a gestational age similar to an extremely preterm infant, this study aims to assess the effect of diet on intestinal epithelial growth and differentiation to elucidate the role nutrition type plays in intestinal development and modifies the risk for NEC. Organoids were cultured for 5 days in growth media and 5 days in differentiation media supplemented 1:40 with four different diets: maternal milk (MM), donor human milk (DHM), standard formula, or extensively hydrolyzed formula. Images were captured daily and organoids were quantified. Organoids were preserved for RNA sequencing and immunofluorescence staining with Ki67, cleaved caspase 3, and chromogranin-A. Media was saved for cytokine/chemokine and growth factor analysis.Human milk supplementation improved growth and differentiation of intestinal organoids generating larger organoids during the growth phase and organoids with longer and wider buds during differentiation compared to formula. Ki67 staining confirmed the proliferative nature of milk-supplemented organoids and chromogranin A staining proved that MM-supplemented organoids induced highest enteroendocrine differentiation. Human milk supplementation also upregulated genes involved in proliferation and promoted a homeostatic immune landscape while those supplemented with formula had a downregulation of cell-cycle-promoting genes and a more inflammatory immune signature. Our results show that MM, and to a lesser extent DHM, support robust intestinal epithelial proliferation and differentiation, suggesting a critical role for factors enriched in human milk in intestinal epithelial health.

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