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Secretory immunoglobulin A from human milk hydrolyzes microRNA
- Source :
- Journal of Dairy Science. 103:6782-6797
- Publication Year :
- 2020
- Publisher :
- American Dairy Science Association, 2020.
-
Abstract
- For breast-fed infants, human milk is a source of various nutrients (e.g., proteins, peptides, antibodies) and bioactive components that promote neonatal growth and protect infants from viral and bacterial infection. Moreover, in terms of infant nutrition and protection the functions of many human milk components are very different from those of blood and other biological fluids of healthy adults. For example, catalytic antibodies ("abzymes") with synthetic activities (protein, oligosaccharide, and lipid kinase activities) have been found in human breast milk that are absent in the blood of healthy people. Abzymes with hydrolyzing functions have been detected not only in milk, but also in the blood of patients with autoimmune diseases. Obviously, feeding newborns human milk has a very specific role and it is a unique aspect of mammalian nutrition. Ribonuclease and DNase autoantibodies or abzymes are found in milk and blood of lactating women, but not in blood sera of healthy men and nonpregnant woman. Here, we present the first evidence that human milk secretory IgA molecules (sIgA) can effectively hydrolyze ribooligonucleotides containing 23 different bases [(pN)23 ribooligonucleotides] and 4 microRNAs: miR-9-5p, miR-219-2-3p, miR-137, and miR-219a-5p. Ribonuclease activity is an inherent property of sIgAs. We showed that 7 individual sIgAs hydrolyzed the ribooligonucleotides (pA)23, (pU)23, and (pC)23 nonspecifically and with comparable efficiency, whereas hydrolysis of the 4 microRNAs by sIgAs was site-specific. Sites of hydrolysis of 4 microRNAs by IgG from blood of patients with schizophrenia have been previously identified. The sites of hydrolysis of 4 microRNAs by sIgA-abzymes were very different from the previously identified sites of hydrolysis by IgG in patients with schizophrenia. In addition, in contrast to IgG, milk sIgAs efficiently hydrolyzed microRNAs in their loop and duplex regions.
- Subjects :
- Adult
Oligosaccharides
Antibodies, Catalytic
03 medical and health sciences
fluids and secretions
Genetics
Animals
Humans
Lactation
Ribonuclease
Kinase activity
030304 developmental biology
chemistry.chemical_classification
0303 health sciences
Milk, Human
biology
Kinase
Hydrolysis
0402 animal and dairy science
Autoantibody
food and beverages
RNA
04 agricultural and veterinary sciences
Ribonucleotides
Oligosaccharide
040201 dairy & animal science
Abzyme
MicroRNAs
chemistry
Biochemistry
Immunoglobulin A, Secretory
biology.protein
Female
Animal Science and Zoology
Antibody
Food Science
Subjects
Details
- ISSN :
- 00220302
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Journal of Dairy Science
- Accession number :
- edsair.doi.dedup.....a5cc6ca237fe4110b8fcf5de0f79a05e