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Glomerular hyperfiltration in hypertensive fawn-hooded rats
M H de Keijzer1, A P Provoost, J C Molenaar
1Department of Pediatric Surgery, Erasmus University, Rotterdam, The Netherlands.
Renal Physiology and Biochemistry
|January 1, 1988
Summary
Spontaneously hypertensive rats exhibit higher glomerular filtration rate (GFR) and urinary protein excretion, indicating potential glomerular hypertension. This study compared these markers in Fawn-Hooded rats versus normotensive controls.
Area of Science:
- Nephrology
- Hypertension Research
- Animal Models of Disease
Background:
- Spontaneously hypertensive rats (SHR) are a key model for studying hypertension.
- Glomerular hyperfiltration and proteinuria are indicators of kidney damage in hypertensive conditions.
- Understanding the mechanisms behind renal dysfunction in hypertension is crucial for developing effective treatments.
Purpose of the Study:
- To investigate renal hemodynamics and function in spontaneously hypertensive Fawn-Hooded (FH) rats.
- To compare glomerular filtration rate (GFR), effective renal plasma flow (ERPF), and urinary protein excretion (UpV) between FH rats and normotensive Wistar Albino Glaxo (WAG) rats.
- To determine if arterial hypertension in FH rats is associated with glomerular hypertension.
Main Methods:
- Determined GFR, ERPF, systolic blood pressure (SBP), and UpV in 12-week-old male FH rats.
- Compared these parameters with age-matched and weight-matched male WAG rats.
- Analyzed the total number of glomeruli per kidney in both strains.
Main Results:
- FH rats exhibited significantly higher GFR compared to WAG rats.
- ERPF did not differ between FH and WAG rats, resulting in a higher filtration fraction in FH rats.
- SBP and UpV were significantly elevated in FH rats, with no difference in glomeruli count.
Conclusions:
- The elevated GFR in FH rats is not attributed to an increased number of glomeruli.
- Arterial hypertension coupled with hyperfiltration proteinuria suggests the presence of glomerular hypertension in FH rats.
- FH rats serve as a valuable model for studying hypertension-induced glomerular injury.