Abstract | AIMS: METHODS AND RESULTS: Two days after coronary artery ligation, Wistar rats received an intra-cerebroventricular (icv) infusion via osmotic mini-pumps of the aldosterone synthase inhibitor FAD286 at 100 microg/kg/day or vehicle for 4 weeks. LV function was assessed by echocardiography at 2 and 4 weeks, and by Millar catheter at 4 weeks. At 4 weeks post-MI, aldosterone in the hippocampus was increased by 70% and tended to increase in the hypothalamus by 20%. These increases were prevented by FAD286. Across groups, aldosterone in the hippocampus and hypothalamus showed a high correlation. There were no differences in brain corticosterone levels. Compared to sham rats, at both 2 and 4 weeks post-MI rats treated with vehicle showed increased LV dimensions and decreased LV ejection fraction. Icv infusion of FAD286 attenuated these changes in LV dimensions and ejection fraction by approximately 30%. At 4 weeks post-MI, LV peak systolic pressure (LVPSP) and dP/dt(max/min) were decreased and LV end-diastolic pressure (LVEDP) was increased. In rats treated with icv FAD286, LVPSP and dP/dt(min) remained normal and LVEDP and dP/dt(max) were markedly improved. Post-MI increases in cardiac fibrosis and cardiomyocyte diameter were substantially attenuated by icv FAD286. CONCLUSION:
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Authors | Bing S Huang, Roselyn A White, Monir Ahmad, Junhui Tan, Arco Y Jeng, Frans H H Leenen |
Journal | Cardiovascular research
(Cardiovasc Res)
Vol. 81
Issue 3
Pg. 574-81
(Feb 15 2009)
ISSN: 1755-3245 [Electronic] England |
PMID | 18689429
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Enzyme Inhibitors
- Aldosterone
- Steroid Hydroxylases
- Cyp11b3 protein, rat
- Cytochrome P-450 CYP11B2
- Corticosterone
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Topics |
- Aldosterone
(blood, metabolism)
- Animals
- Cardiac Catheterization
- Corticosterone
(metabolism)
- Cytochrome P-450 CYP11B2
- Disease Models, Animal
- Echocardiography
- Enzyme Inhibitors
(administration & dosage)
- Fibrosis
- Hippocampus
(drug effects, enzymology)
- Hypothalamus
(drug effects, enzymology)
- Infusions, Parenteral
- Myocardial Infarction
(complications, drug therapy, enzymology, physiopathology)
- Myocardium
(pathology)
- Rats
- Rats, Wistar
- Steroid Hydroxylases
(antagonists & inhibitors, metabolism)
- Stroke Volume
(drug effects)
- Time Factors
- Ventricular Dysfunction, Left
(enzymology, etiology, physiopathology, prevention & control)
- Ventricular Pressure
(drug effects)
- Ventricular Remodeling
(drug effects)
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