Central nervous system effects have been demonstrated for angiotensin II and suggested for aldosterone. In order to determine whether either of these chemicals naturally crosses the blood-brain barrier, radioactive aldosterone and angiotensin II were introduced via intracardiac injections in rats. Samples of blood, liver, kidney, adrenals, cerebral cortex, and hypothalamus were collected at three, 15, and 60 minutes, frozen, dissolved, and counted. Blood levels for aldosterone and angiotensin II remained constant over 60 minutes. Aldosterone accumulated in the liver, kidney, adrenals and hypothalamus three minutes after injection, and levels diminished over time. Angiotensin II levels peaked in the adrenal, kidney, and liver after three minutes, and in the hypothalamus after 15 minutes. Cerebral cortex levels were lower than hypothalamic levels by 30% for aldosterone and 50% for angiotensin II. This suggests that both drugs may enter the central nervous system and selectively accumulate in the hypothalamus.
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Hendler, N.H., Livingston, A. The localization over time of exogenous aldosterone and angiotensin II in various organs. Pav. J. Biol. Sci. 13, 187–193 (1978). https://doi.org/10.1007/BF03001394
- Central Nervous System Effect
- Intracardiac Injection
- Hypothalamic Level
- Active Transport Process