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EFFECT OF LONG‐TERM TREATMENT WITH AN ANGIOTENSIN‐CONVERTING ENZYME INHIBITOR ON THE RENIN‐ANGIOTENSIN SYSTEM IN SPONTANEOUSLY HYPERTENSIVE RATS
Author(s) -
Morishita Ryuichi,
Higaki Jitsuo,
Okunishi Hideki,
Kawamoto Tatsuhiko,
Ishii Kenji,
Nakamura Fumiaki,
Katahira Katsutoshi,
Nagano Masahiro,
Mikami Hiroshi,
Miyazaki Mizuo,
Ogihara Toshio
Publication year - 1991
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1111/j.1440-1681.1991.tb01381.x
Subject(s) - renin–angiotensin system , endocrinology , medicine , plasma renin activity , kidney , renin inhibitor , angiotensin converting enzyme , angiotensin ii , chemistry , ace inhibitor , blood pressure
SUMMARY 1. To obtain information on regulation of the brain renin–angiotensin system, the effect of long‐term administration of angiotensin‐converting enzyme (ACE) inhibitor on brain renin and angiotensinogen mRNA was studied. 2. Spirapril (3 mg/kg) was orally administered daily for 8 weeks to spontaneously hypertensive rats (SHR) from 12 weeks after birth. Renin and angiotensinogen mRNA in the brain and kidney were then quantitated by Northern blot analyses with [ 32 P]‐labelled rat renin and angiotensinogen cDNA as hybridization probes. Plasma renin activity (PRA), angiotensin II (AII) concentration, plasma ACE activity and brain tissue ACE activity were also measured. 3. Compared with the control group, the Spirapril‐treated group had significantly lower blood pressure ( P <0.01), significantly higher PRA ( P <0.01), a not significantly different plasma AII concentration, and lower plasma and brain ACE activities ( P <0.01). Interestingly, the brain renin and angiotensinogen mRNA levels of the two groups were similar, but the renal renin mRNA level was significantly higher in the Spirapril‐treated group ( P <0.01). 4. These results indicate that the mRNA levels of brain renin and angiotensinogen were not affected by chronic ACE inhibition in the circulation and suggest that AII in the brain might not be affected by systemic ACE inhibition.