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Different miRNA contents between mammary epithelial cells and milk fat globules: a random or a targeted process?

Abstract : MicroRNAs (miRNAs) are small noncoding RNAs present in milk-derived extracellular vesicles and milk fat globules (MFG). Nucleic acid content between the lactating mammary tissue (MT) and MFG are quite similar but discrepancies exist in their miRNA content. Our objective was to identify the origin of these discrepancies, and to evaluate the existence of a possible mechanism sorting miRNAs that will or will not be exported from the mammary epithelial cells (MECs) in bovine MFG.miR-125b-5p,miR-126-3p,miR-141-3p, andmiR-204-5p, chosen on the basis of their abundance in the MT, were quantified using RT-qPCR in lactating cow MT, MFG, and laser capture-microdissected MECs. Two miRNAs (miR-125b-5pandmiR-141-3p) were detected in the MT as well as in MFG and MECs.miR-204-5pwas detected only in the MT, suggesting that it is very likely expressed in a cell type other than MECs.miR-126-3pwas detected both in the MT and in MECs but not in MFG, suggesting a targeting mechanism for miRNAs in MECs. These results highlights differences in miRNA content between MECs and MFG may be due to a possibly not random mechanism for loading MFG with miRNA cargos that could involve a variable distribution in MECs or a sorting mechanism.
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https://hal.inrae.fr/hal-03151812
Contributor : Sabine Rossi <>
Submitted on : Thursday, February 25, 2021 - 9:26:44 AM
Last modification on : Tuesday, June 15, 2021 - 2:57:34 PM

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Distributed under a Creative Commons Attribution 4.0 International License

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Karol Pawlowski, Daiane Lago-Novais, Claudia Bevilacqua, Lenha Mobuchon, Nicolas Crapart, et al.. Different miRNA contents between mammary epithelial cells and milk fat globules: a random or a targeted process?. Molecular Biology Reports, Springer Verlag, 2020, 47 (10), pp.8259-8264. ⟨10.1007/s11033-020-05787-8⟩. ⟨hal-03151812⟩

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