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Detection of urinary cystatin-c in IUGR neonates by immunoblot SDS-PAGE
1Department of Surgical and Biomedical Sciences, University of Perugia, Perugia, Italy.
Insights
Monomeric Cystatin-C (cyst-C) is present in the urine of neonates with intrauterine growth retardation (IUGR), indicating potential kidney injury. This finding suggests monomeric cyst-C as an early marker for monitoring renal health in IUGR infants.
Area of Science:
- Nephrology
- Biochemistry
Background:
- Intrauterine growth retardation (IUGR) is a known risk factor for impaired kidney development and function.
- Cystatin-C (cyst-C) is a molecule that can indicate both glomerular and proximal renal injury.
- Previous studies detected elevated urinary cyst-C levels in neonates with IUGR.
Purpose of the Study:
- To investigate the specific forms (monomer/polymer) of Cystatin-C (cyst-C) in the urine of neonates with intrauterine growth retardation (IUGR).
- To determine if the presence or absence of specific cyst-C conformations provides additional information on renal function in IUGR neonates.
Main Methods:
- Urinary samples were collected from 64 neonates with IUGR and 86 healthy appropriate for gestational age (AGA) controls.
- Immunoblot SDS-PAGE was used to analyze the forms of urinary cyst-C.
Main Results:
- SDS-PAGE revealed a reactive complex of approximately 70 kDa in all urine samples.
- The monomeric form of cyst-C (13 kDa) was detected in 78% of IUGR neonates, compared to 12% of AGA neonates.
Conclusions:
- The presence of monomeric cyst-C in IUGR neonates suggests impaired tubular reabsorption.
- Monomeric cyst-C shows potential as an early biochemical marker for identifying IUGR neonates at risk of renal injury.
- Monitoring IUGR infants for monomeric cyst-C can aid in early detection and management of potential renal complications.
Background:
it is known that intrauterine growth retardation (IUGR) represents a risk factor for the deterioration of renal function as it can adversely impact on the number of nephrons developed in the kidney during nephrogenesis. An interesting molecule is the Cystatin-C (cyst-C): it is considered to have the potency to detect both glomerular and proximal renal injury. Recently, using a quantitative EIA cyst-C detection kit, we found increased levels of cyst-C in the urine of neonates with IUGR. Since cyst-C molecules can be present in both monomer and/or polymer forms, the purpose of this study is to investigate in which forms this molecule is present in the urine of IUGR neonates by Immunoblot SDS-PAGE in order to verify if the presence or absence of a particular type of cyst-C conformation can give more information about the renal functioning.
Methods:
urine samples were collected from 64 neonates with IUGR, and 86 healthy controls defined as appropriate for gestational age (AGA). Urinary cyst-C was investigated by the Immunoblot SDS-PAGE.
Results:
in all urine samples, SDS-PAGE analysis showed a reactivity of the IgG anti cyst-C with a complex of about 70 kDa. The monomer form at 13 KDa appeared in 78% of IUGR neonates and in 12% of AGA neonates.
Conclusions:
this study revealed the presence of monomer cyst-C in the urine of IUGR neonates, and suggests an insufficient and/or non-compensatory reabsorption by tubular cells. Monomeric cyst-C can be considered an early biochemical marker to identify and to select IUGR neonates who need to be monitored for risk of renal injury.
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