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Mechanisms affecting the development of renal cystic disease induced by diphenylthiazole
V E Torres1, T J Berndt, M Okamura
1Department of Physiology and Biophysics, Mayo Clinic, Rochester, Minnesota.
Abstract:
To provide information on the possible influence that hypertension or its treatment might have on the development of cysts in autosomal dominant polycystic kidney disease, we studied the effects of the sodium content of the diet, DOCA-salt hypertension, renovascular hypertension, and the administration of enalapril or furosemide on the development of 2-amino-4-5-diphenylthiazole (DPT)-induced renal cystic disease. DOCA-salt hypertension caused vascular and glomerular lesions and proteinuria, but it did not enhance the development of cysts. Cytogenesis was enhanced in experimental conditions where the renin-angiotensin system is known to be activated. On the other hand, interventions known to suppress the renin-angiotensin system lessened the development of cysts. We hypothesize that this effect might be mediated by intrarenal angiotensin II and its capacity to promote cell growth and to control the postglomerular vascular resistances and the compliance of the renal interstitium.
Insights
Hypertension treatments targeting the renin-angiotensin system may reduce cyst growth in autosomal dominant polycystic kidney disease (ADPKD). Suppressing this system lessened cyst development in DPT-induced renal cystic disease models.
Area of Science:
- Nephrology
- Pharmacology
- Molecular Biology
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) is a common genetic disorder characterized by renal cyst formation.
- The role of hypertension and its treatment in ADPKD cystogenesis remains incompletely understood.
- Investigating the impact of modulating the renin-angiotensin system on cyst development is crucial for potential therapeutic strategies.
Purpose of the Study:
- To investigate the influence of hypertension and its treatments on the development of renal cysts.
- To determine the effect of manipulating the renin-angiotensin system on 2-amino-4-5-diphenylthiazole (DPT)-induced renal cystic disease.
- To explore the potential mechanisms by which intrarenal angiotensin II may affect cystogenesis.
Main Methods:
- Studied the effects of dietary sodium, DOCA-salt hypertension, renovascular hypertension, enalapril, and furosemide on DPT-induced renal cystic disease in experimental models.
- Assessed the impact of these interventions on cyst development, vascular and glomerular lesions, and proteinuria.
- Analyzed conditions known to activate or suppress the renin-angiotensin system.
Main Results:
- DOCA-salt hypertension induced vascular and glomerular lesions and proteinuria but did not enhance cyst development.
- Cytogenesis was augmented under conditions activating the renin-angiotensin system.
- Interventions suppressing the renin-angiotensin system led to reduced cyst development.
Conclusions:
- The renin-angiotensin system plays a significant role in promoting cystogenesis in DPT-induced renal cystic disease.
- Suppression of the renin-angiotensin system may be a viable therapeutic strategy for mitigating cyst growth in ADPKD.
- Intrarenal angiotensin II may mediate these effects by promoting cell growth and influencing renal hemodynamics and interstitial properties.