Abstract
The scientific perception of the biological functions of milk, mammal’s secretory product of mammary gland epithelial cells during lactation, has dramatically changed in recent years from a simple food for the newborn mammal to a most sophisticated signaling system between the mother and her infant, in addition to nourishment, protection, and development it provides. From the wide range of extracellular vesicles found in milk, this review focuses primarily on milk exosomes and exosome-delivered microRNAs that emerge as an epigenetic regulatory software of milk decreasing genome methylation of the milk recipient. Thus, milk-derived exosomes are regarded as critical signalosomes for mother-to-child transmission of microRNAs that affect epigenetic regulatory circuits of the milk recipient. Evidence accumulates that epigenetic signaling of milk promotes the development of the infant’s gastrointestinal tract, immune system, osteogenesis, myogenesis, adipogenesis, and neurogenesis. According to the functional hypothesis, milk exosomal microRNAs may reach the systemic circulation of the infant and the adult human milk consumer. Human and bovine milk exosomes and their associated microRNAs are found in the fat fraction of milk and in skim milk. microRNAs are also present in large numbers in the cellular fraction of milk, making it a microRNA-rich medium, likely the richest microRNA source of all body fluids in humans. Human milk and commercial cow’s milk provides abundant amounts of microRNA-148a, microRNA-152, microRNA-29b, and microRNA-21, which all target DNA methyltransferases (DNMTs) that potentially affect whole genome DNA methylation patterns. DNA CpG demethylation upregulates the expression of many genes including the m6A RNA demethylase fat mass- and obesity-associated protein (FTO). In this regard, milk exosomal microRNAs may function as potential epigenetic modifiers of DNA- and RNA methylation of the milk recipient, who under physiological conditions is the suckling infant, but also the human consumer of commercial cow’s milk. Whereas milk exosome-driven epigenetic signaling appears to be indispensable for adequate postnatal growth and programming of the infant, this microRNA transmitter is almost absent in artificial formula, potentially leading to faulty or immature epigenetic programming of formula-fed infants. Furthermore, persistent consumption of commercial cow’s milk that still contains bioactive microRNAs, some of which exhibit high complementarity to human milk microRNAs, has currently unknown consequences to human health and may bear a health risk for humans of developed milk-consuming civilizations.
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Abbreviations
- AGO2:
-
Argonaute 2
- AKT:
-
V-AKT murine thymoma viral oncogene homolog
- CMA:
-
Cow’s milk allergy
- D2R:
-
Dopamine receptor type 2
- DNMT:
-
DNA methyltransferase
- EV:
-
Extracellular vesicle
- FoxP3:
-
Forkhead box P3
- FTO:
-
Fat mass- and obesity-associated gene
- GLUT1:
-
Glucose transporter 1
- IEC:
-
Intestinal epithelial cell
- IgE:
-
Immunoglobulin E
- IGF-1:
-
Insulin-like growth factor-1
- IGF1R:
-
Insulin-like growth factor-1 receptor
- IL:
-
Interleukin
- ILV:
-
Intralumial vesicle
- IκBα:
-
Nuclear factor κB inhibitor α
- KO:
-
Knockout
- LCT:
-
Lactase gene
- m6A:
-
N6-methyladenosine
- MEC:
-
Mammary epithelial cell
- MEF:
-
Mouse embryonic fibroblast
- MFG:
-
Milk fat globule
- MFGM:
-
Milk fat globule membrane
- microRNA:
-
Micro-ribonucleic acid
- mTORC1:
-
Mechanistic target of rapamycin complex 1
- MVB:
-
Multi-vesicular body
- NEC:
-
Necrotizing enterocolitis
- NFKBI:
-
Nuclear factor of κ light chain gene enhancer in B cells inhibitor α
- NF-κB:
-
Nuclear factor κB
- NR4A3:
-
Nuclear receptor subfamily 4, group A, member 3
- NRF2:
-
Nuclear factor erythroid 2-related factor 2
- p53:
-
Transformation-related protein 53
- PBMCs:
-
Peripheral blood mononuclear cells
- PGC1α:
-
PPAR-γ coactivator 1-α
- PI3K:
-
Phosphatidylinositol 3-kinase
- PPARγ:
-
Peroxisome proliferator-activated receptor-γ
- RASGRP1:
-
Ras guanyl nucleotide-releasing protein-1
- RISC:
-
RNA silencing complex
- RNA:
-
Ribonucleic acid
- ROCK1:
-
Rho-associated coiled-coil containing protein kinase 1
- RUNX1T1:
-
Runt-related transcription factor 1, translocated to, 1
- S6 K1:
-
Ribosomal protein S6 kinase
- SIDT1:
-
Systemic RNA interference-defective-1 transmembrane family member 1
- SNP:
-
Single nucleotide polymorphisms
- SREBP-1:
-
Sterol regulatory element-binding protein 1
- SRSF2:
-
Serine/arginine-rich splicing factor-2
- TCR:
-
T cell receptor
- TGFβ:
-
Transforming growth factor-β
- TNF:
-
Tumor necrosis factor
- TSDR:
-
Treg-specific demethylated region
- UTR:
-
Untranslated region
- VEC:
-
Vascular endothelial cell
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Melnik, B.C., Kakulas, F. (2019). Milk Exosomes and MicroRNAs: Potential Epigenetic Regulators. In: Patel, V., Preedy, V. (eds) Handbook of Nutrition, Diet, and Epigenetics. Springer, Cham. https://doi.org/10.1007/978-3-319-55530-0_86
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