Epigenetic alterations in gut and brain of adult rats after oral administration of miR-320-3p and miR-375-3p at mid-lactation, and preventive potential of miR-320-3p on early weaning stress.

Tavares, G. A.; Torres, A.; Le Drean, G.; Queignec, M.; Castellano, B.; Tesson, L.; Remy, S.; Anegon, I.; de Souza, S. L.; Pitard, B.; Kaeffer, B.

doi:10.1101/2022.06.20.496755

bioRxiv · 10.1101/2022.06.20.496755

Epigenetic alterations in gut and brain of adult rats after oral administration of miR-320-3p and miR-375-3p at mid-lactation, and preventive potential of miR-320-3p on early weaning stress.

Tavares, G. A.·Torres, A.·Le Drean, G.·Queignec, M.·Castellano, B.·Tesson, L.·Remy, S.·Anegon, I.·de Souza, S. L.·Pitard, B.·Kaeffer, B.

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Abstract

AimTo investigate if the artificial delivery of microRNAs naturally present in the breastmilk can impact the gut and brain of young rats according to weaning. MethodsAnimals from a new transgenic rat line expressing green-fluorescent protein in the endocrine lineage (cholecystokinin expressing cells) received at Day-12, near neural diversification, a single oral bolus of mir-320-3p or miR-375-3p, embedded in DiOleyl-Succinyl-Paromomycin (DOSP), and were further early (Day-15) or regularly (Day-30) weaned. Relevant miRNA (miR-320-3p, miR-375-3p, miR-375-5p, miR-16-5p, miR-132-3p, miR-504), polr3d, hspb6, inflammation, enteroendocrine, and circadian clock-related mRNAs, chromatin complexes, and duodenal cell density were assayed at 8h post-inoculation and at Day-45. ResultsThe miR-320-3p/DOSP induced immediate effects on H3K4me3 chromatin complexes with polr3d promoter (p<0.05) but no long-term effects. On regular weaning, at Day-45, both miR-320-3p and 375-3p were down-regulated in the stomach, up-regulated in the hypothalamus (p<0.001) but only miR-320-3p was up-regulated in the duodenum. After early weaning, the miR-320-3p and miR-375-3p levels were down-regulated in the stomach and the duodenum, but up-regulated in the hypothalamus and the hippocampus. Combining miR-320-3p/DOSP with early weaning enhanced miR-320-3p and chromogranin A expression in the duodenum. In the hippocampus, the miR-504 was down-regulated for both sexes, but in the brain stem, up regulated only for females, along with miR-320-3p and miR-16-5p levels. In the hypothalamus, clock levels were up regulated for both sexes. In the miR-375-3p/DOSP group, the density of enteroendocrine duodenal cells increased. The long-term effect of miR-375-3p/DOSP was more limited, according to the fourfold lower number of predicted targets than with miR-320-3p. ConclusionAddressing oral miRNA-320-3p loads to duodenal cell lineage is paving the way for the design of new therapeutics, manipulating long term consequences of early life stress.

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Tavares, G. A., Torres, A., Le Drean, G., Queignec, M., Castellano, B., Tesson, L., Remy, S., Anegon, I., de Souza, S. L., Pitard, B., Kaeffer, B.. 2022-06-20. Epigenetic alterations in gut and brain of adult rats after oral administration of miR-320-3p and miR-375-3p at mid-lactation, and preventive potential of miR-320-3p on early weaning stress.. https://doi.org/10.1101/2022.06.20.496755

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