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A rat model of progressive chronic renal failure produced by microembolism
M Kimura1, T Suzuki, A Hishida
1University of Shizuoka School of Nursing, Shizuoka Hamamatsu University School of Medicine, Hamamatsu, Japan. kimura@u-shizuoka-ken.ac.jp
Abstract:
We report a new model of chronic progressive renal failure in rats, produced by a single injection of microspheres (20 to 30 micrometer in diameter) into the left renal artery after right nephrectomy. Significant proteinuria appeared after 4 weeks, followed by hypoalbuminemia and hypercholesterolemia, in rats that received approximately 5 x 10(5) microspheres (0.8 mg). Renal function partially recovered by 4 weeks after nephrectomy and injection from postoperative dysfunction, but deteriorated again 12 weeks after operation. In the early stage, histologic examination showed tubules with cuff-like thickening of basement membranes scattered among apparently intact tubules. Many epithelial cells in the atrophic tubuli were immunoreactive for proliferating cell nuclear antigen (PCNA). Dilated tubules became apparent several weeks after development of tubular atrophy, most likely representing distal tubules. Dilated tubuli were mostly negative for the proliferation marker. These results showed similarity to findings in human chronic renal failure and strongly suggested that tubular atrophy and dilation in chronic tubulointerstitial lesions differ in pathogenesis. This new model of renal failure induced by microembolism should be useful for studying the interaction between normal and diseased tissue elements in histologically heterogenous lesions as well as the pathogenesis of interstitial fibrosis in disturbance of microcirculation.
Insights
Researchers developed a novel rat model for chronic kidney disease using microspheres. This model mimics human disease progression and aids in studying renal failure pathogenesis.
Area of Science:
- Nephrology
- Pathology
- Animal Models
Background:
- Chronic kidney disease (CKD) poses a significant global health burden.
- Understanding the pathogenesis of CKD, particularly tubulointerstitial fibrosis, is crucial for developing effective treatments.
Purpose of the Study:
- To establish and characterize a new rat model of chronic progressive renal failure.
- To investigate the early histological changes and cellular mechanisms involved in this model.
- To compare the findings with human CKD and elucidate the pathogenesis of tubular atrophy and dilation.
Main Methods:
- Induction of renal failure via unilateral nephrectomy followed by left renal artery injection of microspheres (20-30 µm).
- Monitoring of renal function, proteinuria, hypoalbuminemia, and hypercholesterolemia.
- Histological examination and immunohistochemical analysis for proliferating cell nuclear antigen (PCNA).
Main Results:
- Microsphere injection led to progressive renal failure, characterized by proteinuria, hypoalbuminemia, and hypercholesterolemia.
- Early histological findings included tubular atrophy with basement membrane thickening and PCNA-positive epithelial cells.
- Later stages showed dilated tubules, distinct from atrophic ones and negative for PCNA, suggesting different pathogenetic mechanisms.
Conclusions:
- The microsphere-induced model effectively replicates key features of human chronic progressive renal failure.
- Tubular atrophy and dilation appear to have distinct pathogenetic pathways in chronic tubulointerstitial lesions.
- This model is valuable for studying heterogeneous lesions and the role of microcirculatory disturbances in interstitial fibrosis.