Related Experiment Videos
Renal functional changes in experimental cystic disease are tubular in origin
1Department of Pathology, Northwestern University School of Medicine, Chicago, Illinois.
Abstract:
Chronic (30 weeks) structural and functional changes were correlated in diphenylthiazole (DPT)-induced polycystic kidney disease (PKD) in rats. DPT induced two different types of progressive tubular changes: cystic transformation and hyperplastic/atrophic tubular changes. Cystic changes diffusely involved collecting tubules in the outer medulla and cortex, and they were progressive over 30 weeks. Hyperplastic/atrophic changes occurred as clusters of tubules in the cortex and involved between 25% and 50% of tubular profiles after 12 and 30 weeks of drug treatment. Thus, the two types of tubular change were independent of each other and represent different cellular responses to the drug. DPT treatment induced no detectable light- and electron-microscopic or histochemical alterations in glomeruli or renal blood vessels. Renal functional changes consisted of: (1) early (4 weeks) and persistent impairment of concentrating ability; (2) a progressive drop in creatinine clearance and elevation in BUN; and (3) the late onset (30 weeks) of moderate proteinuria. These findings suggest that cystic as well as hyperplastic-atrophic tubular changes contribute to the loss of tubular and renal function in DPT-induced PKD. Both types of tubular lesions may have a role in the development of impaired renal function in other forms of experimental and clinical PKD.
Insights
Diphenylthiazole (DPT) causes two distinct tubular changes in rats, leading to progressive kidney dysfunction. Both cystic and hyperplastic-atrophic tubular changes contribute to impaired renal function in polycystic kidney disease (PKD).
Area of Science:
- Nephrology
- Toxicology
- Pathology
Background:
- Polycystic kidney disease (PKD) is a complex renal disorder.
- Understanding the mechanisms of tubular damage is crucial for developing effective treatments.
- Diphenylthiazole (DPT) is a chemical agent used to induce experimental PKD in animal models.
Purpose of the Study:
- To correlate chronic structural and functional changes in diphenylthiazole (DPT)-induced polycystic kidney disease (PKD) in rats.
- To investigate the independent contributions of different tubular lesions to renal dysfunction.
- To elucidate the role of tubular changes in the pathogenesis of experimental and clinical PKD.
Main Methods:
- Rats were treated with diphenylthiazole (DPT) for 30 weeks to induce polycystic kidney disease (PKD).
- Structural changes in renal tubules, glomeruli, and blood vessels were assessed using light and electron microscopy and histochemistry.
- Renal function was evaluated by measuring concentrating ability, creatinine clearance, blood urea nitrogen (BUN), and proteinuria.
Main Results:
- DPT induced two independent, progressive tubular changes: diffuse cystic transformation of collecting tubules and focal hyperplastic/atrophic tubular changes in the cortex.
- No significant alterations were observed in glomeruli or renal blood vessels.
- Renal functional impairments included early loss of concentrating ability, progressive decline in creatinine clearance, elevated BUN, and late-onset proteinuria.
Conclusions:
- Both cystic and hyperplastic-atrophic tubular changes contribute to the loss of tubular and renal function in DPT-induced PKD.
- These distinct tubular lesions represent different cellular responses to DPT.
- The findings suggest that DPT-induced tubular changes may serve as a valuable model for studying the development of impaired renal function in various forms of PKD.