The relationship between amniotic fluid miRNAs and congenital obstructive nephropathy

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Exosomes, small vesicles in bodily fluids, contain proteins and RNA.
• Exosomal contents, including microRNAs (miRNAs), are potential biomarkers for diagnostics.

Purpose of the Study:

• To investigate exosomal miRNAs in amniotic fluid as biomarkers for prenatal diagnosis of congenital hydronephrosis.
• To evaluate fetal kidney function using exosomal miRNA profiles.

Main Methods:

• Exosomes isolated from amniotic fluid of fetuses with and without congenital hydronephrosis.
• Transmission electron microscopy, flow cytometry, and western blot for exosome identification (CD24, CD9 expression).
• Microarray analysis of exosomal miRNA, followed by qPCR validation and bioinformatic target analysis (KEGG pathways).

Main Results:

• Four miRNAs (has-miR-942, has-miR-4289, has-miRPlus-A1073, has-miR-195-3p) were upregulated; 35 miRNAs were downregulated in congenital hydronephrosis cases.
• hsa-miR-300 and hsa-miR-299-5p target genes are involved in the Wnt signaling pathway.
• Specific target genes (DVL2, PP2R5A, SRFP2, SIAH1) identified for hsa-miR-300 and hsa-miR-299-5p.

Conclusions:

• Exosomal miRNAs in amniotic fluid can serve as potential biomarkers for prenatal diagnosis of congenital hydronephrosis.
• Reduced expression of hsa-miR-300 and hsa-miR-299-5p may indicate kidney fibrosis in congenital obstructive nephropathy.