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Detection of MicroRNA Expression in the Kidneys of Immunoglobulin A Nephropathic Mice
Published on: July 8, 2020
Expression of microRNAs in the urinary sediment of patients with IgA nephropathy
Gang Wang1, Bonnie Ching-Ha Kwan, Fernand Mac-Moune Lai
1Department of Medicine & Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
Background:
Micro-RNAs (miRNAs) regulate one-third of all protein-coding genes and are fundamental in the pathophysiology of a wide range of diseases. We studied the expression of several miRNA species (miR-200 family, miR-205 and miR-192) in the urinary sediment of patients with IgA nephropathy (IgAN).
Methods:
We studied 43 patients with biopsy-proven IgAN. Urinary expression of miRNAs was determined and compared to that from 13 healthy controls.
Results:
The levels of urinary miR-200a, miR-200b and miR-429, but not miR-200c, miR-141, miR-205, or miR-192, were down-regulated in patients with IgAN. Proteinuria significantly correlated with urinary expression of miR-200a (r= -0.483, P < 0.001), miR-200b (r= -0.448, P=0.001) and miR-429 (r=-0.466, P=0.001). Baseline renal function significantly correlated with urinary expression of miR-200b (r= 0.512, P < 0.001) and miR-429 (r=0.425, P=0.005). Urinary gene expression of ZEB2 inversely correlated with miR-200b (r=-0.321, P=0.017); and vimentin expression inversely correlated with that of miR-200a (r=-0.360, P=0.007), miR-200b (r=-0.416, $P =$ 0.002) and miR-429 (r=-0.375, P=0.005). After 33.4 +/- 12.6 months, the rate of renal function decline significantly correlated with urinary expression of miR-200b (r=0.316, P=0.034).
Conclusions:
Urinary expression of miR-200a, miR-200b and miR-429 were down-regulated in patients with IgAN, and the degree of reduction correlated with disease severity and rate of progression. The results suggested that these miRNA species might play important roles in the pathophysiology of IgAN. Further studies are needed to clarify the role of urinary miRNA repression as a non-invasive marker of IgAN.
Insights
Urinary micro-RNAs (miRNAs) miR-200a, miR-200b, and miR-429 are down-regulated in IgA nephropathy (IgAN) patients. Reduced levels correlate with disease severity and progression, suggesting their role in IgAN pathophysiology.
Area of Science:
- Nephrology
- Molecular Biology
- Genetics
Background:
- Micro-RNAs (miRNAs) are key regulators of gene expression, implicated in various disease pathologies.
- Investigating specific miRNA profiles in urinary sediment offers insights into kidney disease mechanisms.
Purpose of the Study:
- To examine the expression levels of specific micro-RNAs (miRNAs) including the miR-200 family, miR-205, and miR-192 in the urinary sediment of patients diagnosed with IgA nephropathy (IgAN).
Main Methods:
- Analysis of urinary miRNA expression in 43 patients with biopsy-proven IgAN.
- Comparison of miRNA levels against 13 healthy control subjects.
Main Results:
- Down-regulation of urinary miR-200a, miR-200b, and miR-429 was observed in IgAN patients compared to controls.
- Urinary miRNA levels showed significant correlations with proteinuria, baseline renal function, and disease progression markers.
- Inverse correlations were found between specific miRNAs (miR-200a, miR-200b, miR-429) and gene expression of ZEB2 and vimentin.
Conclusions:
- Urinary miR-200a, miR-200b, and miR-429 are significantly reduced in IgAN patients.
- The extent of miRNA down-regulation correlates with IgAN severity and progression rate.
- These findings suggest a potential role for these miRNAs in IgAN pathophysiology and as non-invasive biomarkers.
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