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Journal Article
Research Support, Non-U.S. Gov't
Urinary sediment mRNA level of extracellular matrix molecules in adult nephrotic syndrome.
BACKGROUND: Glomerular and tubulointerstitial fibrosis play important roles in the progression of chronic kidney disease. We determine whether urinary mRNA levels of extracellular matrix proteins reflect the degree of kidney fibrosis and predict renal function decline in adult nephrotic patients.
METHODS: We studied 56 adult nephrotic patients and 20 controls. Urinary mRNA levels of collagen I A1 chain (COL1A1), collagen IV A3 chain (COL4A3), and fibronectin were measured.
RESULTS: Urinary sediment mRNA levels of COL1A1 and fibronectin were significantly higher in nephrotic patients as compared to the control, irrespective to the pathological diagnosis. Urinary COL1A1 mRNA level correlates with proteinuria, glomerular and interstitial fibrosis, and inversely with estimated glomerular filtration rate (GFR); urinary fibronectin mRNA level significantly correlates with glomerular and interstitial fibrosis, and inversely with estimated GFR. After 42.4 ± 12.6 months follow-up, the rate of GFR decline inversely correlates with urinary mRNA level of COL1A1 (r = -0.273, p = 0.044). Multivariate analysis confirmed that urinary COL1A1 mRNA level is an independent predictor of serum creatinine doubling or progressing to end stage renal disease; for each 10-fold increase in urinary COL1A1 mRNA level, there is 15.1% excess in risk (95% confidence interval, 1.9% to 30.4%, p=0.022).
CONCLUSIONS: Urinary COL1A1 mRNA level is elevated in nephrotic patients irrespective to the pathological diagnosis, and it correlates with proteinuria, histological scarring, and inversely with renal function. Furthermore, urinary COL1A1 mRNA level predicts renal function loss during follow-up. Our results suggest that urinary COL1A1 mRNA level may be used for risk stratification of adult nephrotic syndrome.
METHODS: We studied 56 adult nephrotic patients and 20 controls. Urinary mRNA levels of collagen I A1 chain (COL1A1), collagen IV A3 chain (COL4A3), and fibronectin were measured.
RESULTS: Urinary sediment mRNA levels of COL1A1 and fibronectin were significantly higher in nephrotic patients as compared to the control, irrespective to the pathological diagnosis. Urinary COL1A1 mRNA level correlates with proteinuria, glomerular and interstitial fibrosis, and inversely with estimated glomerular filtration rate (GFR); urinary fibronectin mRNA level significantly correlates with glomerular and interstitial fibrosis, and inversely with estimated GFR. After 42.4 ± 12.6 months follow-up, the rate of GFR decline inversely correlates with urinary mRNA level of COL1A1 (r = -0.273, p = 0.044). Multivariate analysis confirmed that urinary COL1A1 mRNA level is an independent predictor of serum creatinine doubling or progressing to end stage renal disease; for each 10-fold increase in urinary COL1A1 mRNA level, there is 15.1% excess in risk (95% confidence interval, 1.9% to 30.4%, p=0.022).
CONCLUSIONS: Urinary COL1A1 mRNA level is elevated in nephrotic patients irrespective to the pathological diagnosis, and it correlates with proteinuria, histological scarring, and inversely with renal function. Furthermore, urinary COL1A1 mRNA level predicts renal function loss during follow-up. Our results suggest that urinary COL1A1 mRNA level may be used for risk stratification of adult nephrotic syndrome.
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