The Effect of Human and Bovine Milk Osteopontin on Intestinal Caco-2 Cells: A Transcriptome Comparison

Brian Christensen, Albert J Buitenhuis, Lotte N Jacobsen, Marie S Ostenfeld, Esben S Sørensen*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Osteopontin (OPN) is a multifunctional protein abundantly present in human milk, whereas the concentration is significantly lower in bovine milk. Human and bovine milk OPN are structurally similar and both proteins resist gastric digestion and reach the intestines in a bioactive form. Intervention studies have indicated the beneficial effects of supplementing infant formula with bovine milk OPN and several in vivo and in vitro studies have shown that bovine milk OPN positively influences intestinal development. To investigate the functional relationship, we compared the effect of simulated gastrointestinal digested human and bovine milk OPN on gene expression in Caco-2 cells. After incubation, total RNA was extracted and sequenced and transcripts were mapped to the human genome. Human and bovine milk OPN regulated the expression of 239 and 322 genes, respectively. A total of 131 genes were similarly regulated by the OPNs. As a control, a whey protein fraction with a high content of alpha-lactalbumin had a very limited transcriptional impact on the cells. Enrichment data analysis showed that biological processes related to the ubiquitin system, DNA binding, and genes associated with transcription and transcription control pathways were affected by the OPNs. Collectively, this study shows that human and bovine milk OPN have a significant and highly comparable effect on the intestinal transcriptome.

Original languageEnglish
Article number1166
JournalNutrients
Volume15
Issue5
ISSN2072-6643
DOIs
Publication statusPublished - 25 Feb 2023

Keywords

  • Animals
  • Humans
  • Caco-2 Cells
  • Intestines/chemistry
  • Milk/chemistry
  • Milk, Human/chemistry
  • Osteopontin/metabolism
  • Transcriptome
  • Caco-2 cell line
  • osteopontin
  • transcriptome
  • gastrointestinal digestion
  • bovine
  • human

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