Affiliation:
1. Teagasc Food Research Centre, Moorepark, Fermoy Co. Cork P61C996 Ireland
2. School of Pharmacy and Pharmaceutical Sciences & Trinity Biomedical Sciences Institute Trinity College Dublin Dublin 2 Ireland
3. Animal and Grassland Research and Innovation Centre Teagasc Moorepark, Fermoy Co. Cork P61 P302 Ireland
4. Trinity St. James's Cancer Institute Trinity College Dublin Dublin 2 Ireland
Abstract
ScopeMilk extracellular vesicles (EVs) are nanosized particles with potential immune bioactivities. This study examines their fate during in vitro infant gastrointestinal digestion (GI).Methods and resultsBovine milk is digested using the in vitro INFOGEST method, adjusted for the infant. To unravel the contribution of digestive enzymes from bile, milk is treated with digestive enzymes, bile, or a combination of both. EVs are collected posttreatment using differential ultracentrifugation. EVs characterization includes electrophoresis, immunoblotting, nanoparticle tracking analysis, and atomic force microscopy. EVs protein markers programmed cell death 6‐interacting protein (ALIX), tumor susceptibility gene 101 (TSG101), cluster of differentiation 9 (CD9), and xanthine dehydrogenase (XDH) are detected after gastric digestion (G60), but their signal intensity is significantly reduced by intestinal conditions (p < 0.05). Enzyme digestion, compared to bile treatment (I60 + bile), results in a significant reduction of signal intensities for TSG101 and CD9 (p < 0.05). Nanoparticle tracking analysis shows a significant reduction (p < 0.05) of EV numbers at the end of the intestinal phase. EVs are detected by atomic force microscopy at the end of the intestinal phase, showing that intact EVs can survive upper gut digestion.ConclusionIntact EVs can be found at the end of the intestinal phase. However, digestive enzymes and bile reduce the quantity and characteristics of EVs, with digestive enzymes playing a larger role.
Funder
Department of Agriculture, Food and the Marine, Ireland
Science Foundation Ireland
Cited by
1 articles.
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