Abstract
The effects of intracerebroventricular (i.c.v.) infusion of the angiotensin-converting enzyme (ACE) inhibitor captopril on angiotensin-induced drinking, brain ACE activity, and ACE and angiotensinogen (A-ogen) mRNA levels were examined. I.c.v. infusion of captopril at a rate of 1 μg/μl per h for 7 days resulted in a 60% reduction in brain ACE activity and an 80% reduction in the drinking response to i.c.v. angiotensin I. Quantitative solution hybridization experiments indicated that brain ACE mRNA levels were decreased by 40%, whereas brain A-ogen mRNA levels were unchanged. These results suggest that ACE and A-ogen mRNA levels are regulated differently in the brain than in the peripheral renin-angiotensin system.
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