Ruminant Milk-Derived Extracellular Vesicles: History
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Subjects: Nutrition & Dietetics
Contributor:
Siew Ling Ong

Milk has been shown to contain a specific fraction of extracellular particles that are reported to resist digestion and are purposefully packaged with lipids, proteins, and nucleic acids to exert specific biological effects. These findings suggest that these particles may have a role in the quality of infant nutrition, particularly in the early phase of life when many of the foundations of an infant’s potential for health and overall wellness are established. However, much of the current research focuses on human or cow milk only, and there is a knowledge gap in how milk from other species, which may be more commonly consumed in different regions, could also have these reported biological effects.

  • milk
  • extracellular vesicle
  • exosome
  • ruminant
  • MISEV

1. Introduction

Milk is the only food that has evolved to meet the nutritional needs of newborns, supporting growth and development while also being a significant source of nutrients in adults [1][2][3]. The domestication of livestock was a pivotal step in the consumption of non-human milk which has become a substantial source of essential nutrients in many diets globally [4][5][6]. To meet this demand, the production of milk increased from 708 million tonnes in 2009 to 883 million tonnes in 2019, with cow and buffalo milk accounting for 81% and 15% of production, respectively ( Supplementary Table S1 ) [7].

In early life, major milk components such as lactose (energy source), minerals (musculoskeletal development), and high-value biological proteins provide essential nutrition [8][9]. Milk consumption throughout life can also address malnutrition and can represent a significant proportion of overall nutrient intake in developing nations [10].

While the milk macro- and micronutrient composition is largely well established, there is considerable interest in milk-derived extracellular vesicles (EVs) and their cargoes as a source of nutrients in the classical sense, such as nucleosides, and amino acids, or as a nutritional component that influences biological functions by regulating biochemical pathways and/or interactions with the host’s gut microbiome [11][12][13][14][15][16][17][18]. Evolutionary theory suggests that milk-derived EVs and their cargoes must have a biological purpose to justify the metabolic cost required to produce them during lactation.

Our review covers the following: a summary of the nutritional composition of the types of milk that have been used to study milk-derived EVs, the nature and composition of these vesicles and their cargoes, the evidence for their stability and uptake in the gastrointestinal tract, their reported biological effects, and some of the key challenges in using them for studies. Methods used to identify peer-reviewed studies are shown in Figure 1 . Our review excludes any studies on plant-derived milk alternatives.

Nutrients 13 02505 g001 550
Figure 1. Schematic diagram for selection of included studies.

2. Milk-Derived EVs

Characterisation of isolated EVs still largely uses immunochemical (e.g., ELISA, Western blot), MS-based, and optical (e.g., nanoparticle tracking analysis (NTA), microscopy, and flow cytometry) methods. However, any of the single aforesaid detection approaches may not be sufficient to address the issues of specificity, efficiency, and consistency in EV detection. More often, multiple detection approaches are employed within the research community when it comes to EV characterisation. The progression in analytical sciences has pushed for the development of new and innovative instruments to meet the abovementioned challenges. Recent review articles have summarised the emerging new technologies available that are specifically developed for EV characterisation [19][20][21][22][23].

There are particular challenges in isolating lipids from milk-derived EVs due to the co-isolation of milk lipids (i.e., MFGs), and in milk EV isolates with a high triacylglycerol content (TAG), since MFGs contain a greater amount of TAGs in their core than EVs [24][25], potentially interfering with accurate EV lipidomic studies. In this review, MFG lipidomic studies are not included because the biophysical properties (tri-layered membrane) and cargoes of MFGs are distinctly different from those of EVs.

Major findings of nucleic acid studies conducted on EVs of different mammalian milk used to characterise the RNA composition of milk-derived EVs and exosomes.

The terminology used is based on the reference cited, and this division reflects older thinking and it is a “pool” of EVs that are responsible for the effects (circRNA, circular RNA; lncRNA, long non-coding RNA; miRNA, micro-RNA; NGS, next-generation sequencing; qPCR, quantitative PCR).

3. Stability and Uptake of Milk-Derived EVs

The studies reported in the previous sections described how EVs contain a range of lipids, proteins, and nucleic acids. The stability, i.e., resistance to degradation due to processing or digestion, of milk EVs and cargoes, and how they are taken up by the recipient cells have been studied in cows [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42], humans [43][44][45][46][47][48], goats [49], and buffaloes [50]. These studies are summarised in Table 1 .

Table 1. Major findings of studies on the general stability and uptake of mammalian milk-derived EVs.
Species Findings Ref.
  Extracellular vesicle
Human Stability and uptake of natural and synthetic EVs loaded with locked nucleic acid anti-sense oligonucleotides in vitro (PHH, NCI-H460 cell line, and hPSC) and in vivo (mice). [47]
Cow The impact of industrial processing on milk EVs’ structural integrity and molecular composition. [51]
Cow Cellular internalisation of EVs in vitro (hPAEC and NRCM). [52]
Cow Development of non-invasive fluorescent labelling of EVs in vitro (Caco-2 cell line), demonstrating internalisation and co-localisation of labelled EVs. [53]
Cow Time-dependent uptake of colostral miRNA, EV proteins, and isomiRs after feeding in vivo (calves). [54]
Cow Demonstrated that microwaving, but not autoclaving, agitation, or freezing, reduced miR-220c abundance. [34]
  Exosome
Human Resistance of exosomes isolated from preterm human milk to in vitro digestion and internalisation in vitro (HIEC). [28]
Human Exosomal protein markers resist degradation by in vitro digestion, pH 4.5, and the uptake of digested and undigested exosomes, based on immunofluorescence imaging of exosomal protein markers in vitro (HIEC). [44]
Human Resistance of miRNA to degradation caused by incubation at 26 °C over 24 h, six freeze–thaw cycles at −20 °C, treatment with RNase A and RNase T1, and incubation at 100 °C for 10 min. [45]
Human Demonstrated the uptake of RNA ex vivo (macrophages). [48]
Human + Cow Storage at 4 °C substantially reduced the exosome content, especially miRNA, of human milk over time, and the infant formulae tested had no detectable miRNA. [43]
Cow Assessed the accumulation and effects of milk exosomes and miRNA cargoes on embryo development in C57BL/6 mice. [55]
Cow Resistance of lncRNA to degradation by in vitro digestion. [29]
Cow Resistance of paclitaxel (chemotherapeutic), encapsulated in these exosomes, to degradation and loss of efficacy from long-term storage at −80 °C for 4 weeks. [40]
Cow Resistance of 5 miRNAs to degradation by an in vitro digestion method and in vitro internalisation of exosomes. [26]
Cow Uptake of exosomes and exosome-encapsulated siRNA (both digested and undigested) in vitro (Caco-2 cell line). [35]
Cow Fermentation of milk exosomes with probiotic Streptococcus thermophiles, Lactobacilli, and Bifidobacteria reduces miR-29b and miR-21 abundance and total protein concentration. [31]
Cow Challenged the findings from a previous study [27] regarding the dietary transfer of cow milk-derived miRNA in humans. [41]
Cow Demonstrated that miR-223 and miR-125b persist in high abundance after simulated in vitro digestion (TNO TIM-1 model). Authors found that exosomes may not be the only carrier of these miRNAs in milk. [38]
Cow Uptake and bioavailability of fluorescent-labelled exosomes and their miRNA cargoes via endocytosis in vivo (C57BL/6 mice) and in vitro (HUVEC). [37]
Cow Resistance of native miRNA and anticancer compounds encapsulated in these exosomes to degradation from long-term storage at −80 °C for 6 months. [39]
Cow Uptake of miRNA in differentiated and undifferentiated THP-1 cells. [30]
Cow Uptake and transport of miRNA by endocytosis in vitro (Caco-2 and IEC-6 cell lines). [36]
Cow Uptake of miR-29b and miR-200c in a randomised crossover feeding study, in C57BL/6J mice (± miRNA depletion), and human peripheral blood mononuclear cells (PBMCs). [27]
Cow + Pig + Mice Cross-species biodistribution profile of miRNAs in mice and pig model. [56]
Goat + cancer cell lines A novel approach of covalently labelled exosomes with commercial fluorophores in vitro (U87 and B16F10 cell lines) and in vivo (C57BL/6 mice). [57]
Goat Uptake, bioavailability, and tissue distribution of radiolabelled (reduced technetium, 99mTc (IV)) exosomes using non-invasive single-photon emission computed tomography imaging in Balb/C mice. [49]
  Microvesicles/Nanovesicles/Other
Human Presence of immune-related miRNA in human milk, two of which were present in exosomes. miR-21 and miR-181a were resistant to degradation by RNase, pH 1, and freeze–thaw, indicating an extracellular protective mechanism. [46]
Cow Pasteurisation and homogenisation, but not 4 °C storage, substantially reduce the abundance of miR-200c and miR29b in four types of milk tested. Somatic cells in the milk accounted for <1% of the abundance of these miRNAs in milk, consistent with these miRNAs packaged in extracellular structures such as EVs. [42]
Cow Presence of mRNA and miRNA which were resistant to degradation by RNase, pH 2, incubation at 37 °C, but not Triton X-100, indicating an extracellular protective mechanism. [33]
Cow Presence of mRNA and miRNA in both samples. These RNAs were resistant to degradation by pH 2, indicating an extracellular protective mechanism. [32]
Buffalo Demonstrated that 4 °C storage and multiple freeze–thaws reduced the abundance of miR-21 and miR-500. [50]
The terminology used is based on the reference cited, and this division reflects older thinking and is a “pool” of EVs that are responsible for the effects (HIEC, human intestinal epithelial crypt-like cell; hPAEC, human pulmonary artery endothelial cell; hPSC, human pluripotent stem cell; HUVEC, human umbilical vein endothelial cell; NRCM, neonatal rat cardiomyocyte; PBMC, peripheral blood mononuclear cell; PHH, primary human hepatocyte).

These studies show that the structure of EVs protects them against harsh conditions, such as low pH, temperature variations, or high concentrations of RNase. This capacity to resist degradation and digestion underpins the study of their potential biological effects, either as nutrient delivery or as drug delivery vehicles.

4. Biological Effects of Milk-Derived EVs

The previous sections indicate that milk-derived EVs may contain bioactive components, which are protected against degradation and digestion. The studies to date that have focused on the biological effects of milk-derived EVs are highlighted in Table 7. The majority of these studies used human or cow milk EVs, and there is a clear knowledge gap regarding whether milk from other species has similar or different effects.

The studies researched the effects of EVs and exosomes on the gut microbiota [31][56][58], on the use of a delivery vehicle [59][26][60][35][40][61][62][63][64][65][66], in the immune response [67][30][68][69][48][70][71][72][73][74][75], in diseases such as cancer, [76][77][36][63][66][74][78][79][80][81][82][83][84][85][86][87], and in other aspects of cell biology [88][89][90][91][92][93][94][95]. These studies show that milk-derived EVs can have meaningful biological effects in the model systems used, forming a basis for future research.

Major findings of studies on the biological effects of mammalian milk-derived EVs.

The terminology used is based on the reference cited, and this division reflects older thinking and is a “pool” of EVs that are responsible for the effects (ASC, adipose-derived stem cell; DSS, dextran sulphate sodium; hPAEC: human pulmonary artery endothelial cell; MDC, monocyte-derived dendritic cell; MSC, mesenchymal stem cell; NEC, necrotising enterocolitis; NRCM, neonatal rate cardiac myocyte; PBMC, peripheral blood mononuclear cell; SCFA, short-chain fatty acid; LPS, lipopolysaccharide).

This entry is adapted from the peer-reviewed paper 10.3390/nu13082505

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