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Published on: January 7, 2013
Evaluation of organic nephrotoxins in rabbit renal cortical slices
G H Wolfgang1, A J Gandolfi, K Brendel
1Department of Pharmacology and Toxicology, University of Arizona, Tucson, AZ 85724, USA.
Abstract:
An in vitro cortical-slice system was used to assess the toxicity of several organic nephrotoxins that require transport and/or bioactivation in order to induce toxicity. The toxins cephaloridine, hexachlorobutadiene, S-(1,2- dichlorovinyl)- l -cysteine and gentamicin all produce site-specific proximal tubular injury when administered in vivo. Damage was assessed in vitro by observing alterations in intracellular potassium, intracellular lactate dehydrogenase, and organic anion and cation accumulation. Histopathology was studied to assess the localization of injury. All four compounds produced dose- and time-dependent decreases in the biochemical parameters as well as site-specific lesions in the S(3) region. The results illustrate the usefulness of renal cortical slices in acute studies of organic nephrotoxins.
Insights
This study shows that renal cortical slices effectively assess organic nephrotoxin damage. The in vitro system accurately predicts site-specific kidney injury caused by toxins like cephaloridine and gentamicin.
Area of Science:
- Nephrology
- Toxicology
- In Vitro models
Background:
- Organic nephrotoxins cause site-specific proximal tubular injury in vivo.
- Toxin-induced kidney damage often involves complex transport and bioactivation processes.
Purpose of the Study:
- To evaluate the utility of an in vitro renal cortical slice system for assessing organic nephrotoxin toxicity.
- To determine if this system can replicate site-specific proximal tubular injury observed in vivo.
Main Methods:
- Utilized an in vitro renal cortical slice system.
- Assessed toxicity by measuring intracellular potassium, lactate dehydrogenase, and organic anion/cation accumulation.
- Examined histopathology to localize injury within the renal cortex.
Main Results:
- All tested nephrotoxins (cephaloridine, hexachlorobutadiene, S-(1,2-dichlorovinyl)-l-cysteine, gentamicin) induced dose- and time-dependent biochemical changes.
- Observed site-specific lesions in the S(3) proximal tubule region, mirroring in vivo findings.
- Demonstrated alterations in intracellular potassium and LDH levels, indicating cellular damage.
Conclusions:
- Renal cortical slices provide a valuable in vitro model for acute toxicity studies of organic nephrotoxins.
- The system successfully predicts the site-specific nature of proximal tubular injury.
- This method aids in understanding the mechanisms of nephrotoxicity requiring transport or bioactivation.
