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Immunohistochemical identification of kidney nephron segments in the dog, rat, mouse, and cynomolgus monkey
Anne-Laure Bauchet1, Regis Masson, Magali Guffroy
1Sanofi-Aventis R&D, DSAR, Preclinical Safety, Vitry-sur-Seine, France. Anne-laure.bauchet@cea.fr
Abstract:
Kidney is a major target organ in preclinical studies. In recent years, intense research has been undertaken to characterize novel renal toxicity biomarkers. In this context, we studied nephron segment specific antibodies against aquaporin-1 (AQP-1), α-glutathione-S-transferase (alpha-GST), Tamm-Horsfall protein (TH), calbindin-D(28K) (CalD), and aquaporin-2 (AQP-2), using an immunoperoxidase method on formalin-fixed paraffin-embedded kidney tissues of dogs, rats, mice, and Cynomolgus monkeys. AQP-1 was specific for proximal tubules and thin descending limbs of Henle's loops and AQP-2 for connecting and collecting ducts in dogs, rats, mice, and Cynomolgus monkeys. Alpha-GST stained the straight part of proximal tubules in dogs and proximal convoluted tubule and straight part of proximal tubules in rats. TH was specific for thick ascending limbs of Henle's loops in mice, rats, dogs, and Cynomolgus monkeys and stained additionally scattered cells in cortical connecting/collecting ducts of dogs. CalD was found in distal convoluted tubules and cortical connecting and collecting ducts of dogs, rats, and mice and in distal convoluted tubules, connecting ducts, and cortical and medullary collecting ducts of Cynomolgus monkey. This panel of antibodies may be a helpful tool to identify renal tubules by light microscopy in preclinical studies and to validate new biomarkers of renal toxicity.
Insights
This study identifies specific kidney tubule markers using antibodies in preclinical models. These validated biomarkers aid in identifying renal tubules and assessing kidney toxicity in research.
Area of Science:
- Nephrology
- Toxicology
- Immunohistochemistry
Background:
- The kidney is a primary target organ in preclinical toxicity studies.
- Characterizing novel renal toxicity biomarkers is crucial for drug development and safety assessment.
- Specific antibodies are needed to identify nephron segments for accurate toxicity evaluation.
Purpose of the Study:
- To investigate the utility of nephron segment-specific antibodies for identifying renal tubules in preclinical species.
- To evaluate a panel of antibodies (aquaporin-1, alpha-GST, TH, CalD, aquaporin-2) for their specificity in canine, rat, mouse, and non-human primate kidneys.
- To establish a tool for validating new renal toxicity biomarkers.
Main Methods:
- Immunoperoxidase staining on formalin-fixed paraffin-embedded kidney tissues.
- Utilized antibodies against aquaporin-1 (AQP-1), alpha-glutathione-S-transferase (alpha-GST), Tamm-Horsfall protein (TH), calbindin-D(28K) (CalD), and aquaporin-2 (AQP-2).
- Examined kidney tissues from dogs, rats, mice, and Cynomolgus monkeys.
Main Results:
- AQP-1 localized to proximal tubules and thin descending limbs; AQP-2 to connecting and collecting ducts across all species.
- Alpha-GST showed specificity for proximal tubules in dogs and rats.
- TH identified thick ascending limbs, while CalD stained distal convoluted and collecting tubules, with species-specific variations.
Conclusions:
- The studied antibody panel effectively identifies specific renal tubules in preclinical species via light microscopy.
- This panel serves as a valuable tool for validating novel biomarkers of kidney toxicity.
- Accurate identification of renal tubules is essential for interpreting preclinical safety studies.
