Human breast milk exosomes attenuate intestinal damage
Human breast milk (HBM), which contains an abundant supply of exosomes, is known to prevent necrotizing enterocolitis (NEC). Preterm infants are commonly given pasteurized donor milk when HBM is unavailable. However, pasteurization can disrupt its components. This study investigates the effects of both raw and pasteurized HBM-derived exosomes on intestinal inflammation.
HBM exosomes were isolated and characterized by positive CD63 and negative calnexin markers from western blot, nanoparticle tracking analysis and transmission electron microscopy. Mouse intestine organoids were established and treated with exosomes from raw or pasteurized HBM in healthy and injury conditions. Following ethical approval (#44032), mice pups were randomly assigned to (1) breastfed control; (2) NEC; (3) NEC receiving raw HBM exosomes; (4) NEC receiving pasteurized HBM exosomes. NEC was induced by hypoxia, gavage feeding and lipopolysaccharide (LPS). Ileum was evaluated. Data were analyzed using one-way ANOVA with Bonferroni post-test.
Both raw and pasteurized HBM exosomes decreased inflammation in hypoxia and LPS-treated organoids compared to control. In vivo, NEC-induced mucosal injury, inflammation and mucous production were improved by raw and pasteurized HBM-derived exosomes.
Exosomes derived from raw and pasteurized HBM equally reduced intestinal damage. Exosome administration in clinical practice requires further investigation.
KeywordsHuman milk Exosomes Inflammation Pasteurization Necrotizing enterocolitis
HM, CL, SC, and MB: conception and design, collection and/or assembly of data, data analysis and interpretation, manuscript writing, and final approval of manuscript. MP, BL, SS, and DO: collection and/or assembly of data, data analysis and interpretation, and final approval of manuscript. AP: conception and design, financial support, and final approval of manuscript.
Dr. Agostino Pierro was funded by Canadian Institutes of Health Research (CIHR) Foundation Grant (Grant number 353857) and the endowment of the Robert M. Filler Chair of Surgery.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants performed by any of the authors. All procedures performed in studies involving animals were in accordance with the ethical standards of the Animal Care Protocol of the Hospital for Sick Children at which the studies were conducted (Animal Care Committee AUP #44032). All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
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