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Sci Rep. 2017 Jan 17;7:40601. doi: 10.1038/srep40601.

Urinary Exosomes Contain MicroRNAs Capable of Paracrine Modulation of Tubular Transporters in Kidney.

Author information

1
Department of Medical Genetics, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, UK.
2
Department of Pathology, University of Cambridge, Cambridge, UK.
3
Department of Veterinary Medicine University of Cambridge, Cambridge, UK.
4
Departments of Genetic, University of Cambridge, Cambridge, UK.

Abstract

Exosomes derived from all nephron segments are present in human urine, where their functionality is incompletely understood. Most studies have focused on biomarker discovery rather than exosome function. Through sequencing we identified the miRNA repertoire of urinary exosomes from healthy volunteers; 276 mature miRNAs and 345 pre-miRNAs were identified (43%/7% of reads). Among the most abundant were members of the miR-10, miR-30 and let-7 families. Targets for the identified miRNAs were predicted using five different databases; genes encoding membrane transporters and their regulators were enriched, highlighting the possibility that these miRNAs could modulate key renal tubular functions in a paracrine manner. As proof of concept, cultured renal epithelial cells were exposed to urinary exosomes and cellular exosomal uptake was confirmed; thereafter, reduced levels of the potassium channel ROMK and kinases SGK1 and WNK1 were observed in a human collecting duct cell line, while SPAK was unaltered. In proximal tubular cells, mRNA levels of the amino acid transporter gene SLC38A2 were diminished and reflected in a significant decrement of its encoded protein SNAT2. Protein levels of the kinase SGK1 did not change. Thus we demonstrated a novel potential function for miRNA in urinary exosomes.

PMID:
28094285
PMCID:
PMC5240140
DOI:
10.1038/srep40601
[Indexed for MEDLINE]
Free PMC Article

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