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The effects of intracerebroventricular administrations of three natural angiotensins, angiotensin I (ANG I 3.8 X 10-11-9.4 X10-10 mol/kg body weight), II (9.6 X 10-12-2.4 X 10-10 mol/kg body weight) and III (2.7 X 10-10 2.5 X 10-9 mol/kg body weight) on systemic blood pressure were investigated in conscious rats. Angiotensin II (ANG II), ANG I and angiotensin III (ANG III), increased blood pressure in a dose-related manner. The order of potency of angiotensins was ANG II greater than ANG I greater than ANG III. The intraventricular administration of a converting enzyme inhibitor (SQ 14225, 6.9 X10-8 mol/kg) abolished the central effect of ANG I, while an angiotensin II analogue ([Sar1-Ala8]ANG II, 1.1 X 10-8 mol/kg) administered intraventricularly inhibited the central pressor effects of these three angiotensins. These results suggest that ANG II is a main mediator of the renin-angiotensin system in the central nervous system.
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