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Effect of cisplatin on glomerular hemodynamics
E J Barros1, M A Boim, O F Santos
1Escola Paulista de Medicina, SP, Brasil.
Summary
Cisplatin causes acute kidney injury by reducing glomerular filtration rate and plasma flow, increasing renal vascular resistance. This study in rats reveals cisplatin
Area of Science:
- Nephrology
- Pharmacology
- Physiology
Background:
- Cisplatin is a widely used chemotherapy agent.
- Nephrotoxicity is a significant dose-limiting side effect of cisplatin.
- The precise mechanisms underlying cisplatin-induced kidney damage remain under investigation.
Purpose of the Study:
- To investigate the effects of cisplatin on renal microcirculation and kidney function in rats.
- To elucidate the impact of cisplatin on glomerular filtration rate (GFR) and intrarenal hemodynamics.
Main Methods:
- Euvolemic Munich-Wistar rats were used for micropuncture studies.
- Rats received a single dose of cisplatin (6 mg/kg, ip) or saline control.
- Glomerular filtration rate, single nephron GFR, glomerular plasma flow, and arteriolar resistances were measured.
Main Results:
- Cisplatin induced non-oliguric acute renal failure, significantly decreasing GFR and single nephron GFR.
- Glomerular plasma flow and transcapillary hydraulic pressure difference were reduced post-cisplatin.
- An increase in arteriolar resistances, particularly afferent arteriolar resistance, was observed.
Conclusions:
- Cisplatin impairs renal microcirculation by increasing arteriolar resistance and reducing glomerular plasma flow.
- These hemodynamic changes contribute to the development of acute kidney injury following cisplatin administration.
- The glomerular ultrafiltration coefficient remained unchanged, suggesting filtration surface area is preserved.