Related Experiment Videos
Urinary clusterin in chronic nephrotoxicity in the rat
1Department of Pharmacology, Cornell University Medical College, New York, New York 10021.
Summary
Clusterin excretion remains elevated in rats during chronic gentamicin exposure, unlike N-acetyl-beta-glucosaminidase (NAG). This suggests clusterin may be a more persistent marker of kidney injury than NAG.
Area of Science:
- Nephrology
- Biochemistry
- Toxicology
Background:
- Gentamicin nephrotoxicity is a significant clinical concern.
- N-acetyl-beta-glucosaminidase (NAG) is a known marker for renal tubular damage.
- The utility of clusterin as a biomarker for kidney injury requires further investigation.
Purpose of the Study:
- To compare the urinary excretion patterns of clusterin and NAG in rats undergoing chronic gentamicin administration.
- To determine if clusterin excretion remains elevated when NAG excretion declines during prolonged gentamicin exposure.
Main Methods:
- Rats were administered daily gentamicin for 2 months at varying doses (110 mg/kg then 90 mg/kg).
- Urinary clusterin levels were measured using radioimmunoassay.
- Urinary NAG levels were quantified via enzyme hydrolysis assay.
Main Results:
- Both clusterin and NAG excretion initially increased rapidly, then declined.
- Urinary clusterin levels remained significantly elevated above control throughout the study.
- Urinary NAG levels returned to near-normal levels in the final 10 days, despite active tubulointerstitial disease.
Conclusions:
- Clusterin excretion is a more sustained indicator of gentamicin-induced renal tubular injury compared to NAG.
- Clusterin warrants further evaluation as a potential biomarker for renal tubular cell injury or death.