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RNA Biol. 2013 Jul;10(7):1080-6. doi: 10.4161/rna.25246. Epub 2013 Jun 3.

Real-time quantitative PCR and droplet digital PCR for plant miRNAs in mammalian blood provide little evidence for general uptake of dietary miRNAs: limited evidence for general uptake of dietary plant xenomiRs.

Author information

1
Department of Molecular and Comparative Pathobiology; The Johns Hopkins University School of Medicine; Baltimore, ME USA.

Abstract

Evidence that exogenous dietary miRNAs enter the bloodstream and tissues of ingesting animals has been accompanied by an indication that at least one plant miRNA, miR168, participates in "cross-kingdom" regulation of a mammalian transcript. If confirmed, these findings would support investigation of miRNA-based dietary interventions in disease. Here, blood was obtained pre- and post-prandially (1, 4, 12 h) from pigtailed macaques that received a miRNA-rich plant-based substance. Plant and endogenous miRNAs were measured by RT-qPCR. Although low-level amplification was observed for some plant miRNA assays, amplification was variable and possibly non-specific, as suggested by droplet digital PCR. A consistent response to dietary intake was not observed. While our results do not support general and consistent uptake of dietary plant miRNAs, additional studies are needed to establish whether or not plant or animal xenomiRs are transferred across the gut in sufficient quantity to regulate endogenous genes.

KEYWORDS:

RT-qPCR; diet; digital PCR; exosome; extracellular vesicle; microRNA; nutrition; plant; xenomiR

PMID:
23770773
PMCID:
PMC3849155
DOI:
10.4161/rna.25246
[Indexed for MEDLINE]
Free PMC Article

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