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Single nephron hemodynamics in spontaneously hypertensive rats
L G Feld1, M J Zamlauski-Tucker, J E Springate
1Department of Pediatrics, State University of New York at Buffalo, School of Medicine and Biomedical Sciences, USA.
Summary
Glomerular hypertension does not appear to cause kidney injury in aging spontaneously hypertensive rats (SHR). Studies in SHR and Wistar-Kyoto (WKY) rats show no consistent link between capillary pressure and renal damage.
Area of Science:
- Nephrology
- Hypertension Research
- Animal Models
Background:
- Spontaneously hypertensive rats (SHR) exhibit significant proteinuria, primarily albuminuria, after five months of age.
- The role of glomerular hypertension in age-related renal injury in SHR requires further investigation.
Purpose of the Study:
- To investigate the development of glomerular hypertension with age in spontaneously hypertensive rats (SHR).
- To determine if age-related changes in glomerular hemodynamics contribute to renal injury in SHR.
Main Methods:
- Hemodynamic measurements of whole kidney and single nephron in male SHR and Wistar-Kyoto (WKY) rats at 5, 10, and 15 months of age.
- Assessment of glomerular filtration rate and afferent glomerular capillary hydraulic pressure (PGC).
Main Results:
- No significant differences in whole kidney or single nephron glomerular filtration rates were observed between SHR and WKY rats.
- Afferent glomerular capillary hydraulic pressure (PGC) was transiently elevated in SHR at 10 months but significantly lower at 15 months compared to WKY.
- Proteinuria, predominantly albuminuria, was present in SHR after 5 months.
Conclusions:
- Increased glomerular capillary pressure is not a primary factor in the development or progression of renal injury in aging spontaneously hypertensive rats.
- Age-related hemodynamic changes do not appear to drive renal pathology in this model of hypertension.