Effect of elevated blood pressure, renin and aldosterone on renal sodium handling in two-kidney Goldblatt hypertensive rats |
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| Authors: | A B Bikhazi J N Bitar A E Birbari |
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| Affiliation: | 1. Department of Health Technology and Informatics, Hong Kong Polytechnic University, Kowloon, Hong Kong;2. Department of Ultrasound, Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China;3. Central Lab, Liver Disease Research Center, The Affiliated Hospital of Yunnan University, Kunming City, Yunnan Province, China |
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| Abstract: | The effect of elevated blood pressure, renin and aldosterone on renal Na+ retention in two-kidney Goldblatt hypertensive rats were investigated. The technique involved retrograde perfusion from the renal veins via the kidneys, and then through the renal arteries and dorsal aorta. Sodium retention in the stenosed kidney of 7 and 30-60 days post-stenosis hypertensive rats was 82 and 70% higher than in normotensive sham-operated rats respectively. Sodium rention in the clipped kidney, 1 day post-stenosis, was insignificant. However, the contralateral kidney of the 1 day post-stenosis rats retained 27% more Na+. The 1 and 7 days post-stenosis rats had higher plasma aldosterone concentrations than controls, while the 30-60 days post-stenosis rats showed lower levels. The plasma renin activity of the 1 day post-stenosis rats showed 65% higher activity than the sham controls with no significant change in the 30-60 days post-stenosis. Therefore Na+ retention may be mediated by aldosterone in the 7 days post-stenosis rats. Natriuresis in the non-stenosed kidneys of both the 7 and 30-60 days post-stenosis rats may be modulated by an increase in filtration rate due to hypertrophy. |
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