Abstract | BACKGROUND: METHODS AND RESULTS: SR vesicles were isolated from dog left ventricular muscle (normal or exposed to 4-week rapid ventricular pacing with or without valsartan). In the untreated and valsartan-treated paced dogs, cardiac function showed similar deterioration (compared with before pacing). However, both the density of beta-receptors and the contractile response to dobutamine were greater in the valsartan-treated paced dogs than in the untreated paced dogs. In untreated paced hearts, the ryanodine receptor was protein kinase A-hyperphosphorylated, showed an abnormal Ca2+ leak, and had a decreased amount of ryanodine receptor-bound FKBP12.6. No such phenomena were seen in the valsartan-treated paced hearts. Both the SR Ca2+ uptake function and the amount of Ca2+- ATPase were decreased in the untreated failing SR, but both were restored in the valsartan-treated SR. CONCLUSIONS: During the development of pacing-induced heart failure, valsartan preserved the density of beta-receptors and concurrently restored SR function without improving resting cardiac function.
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Authors | Shinichi Okuda, Masafumi Yano, Masahiro Doi, Tetsuro Oda, Takahiro Tokuhisa, Masateru Kohno, Shigeki Kobayashi, Takeshi Yamamoto, Tomoko Ohkusa, Masunori Matsuzaki |
Journal | Circulation
(Circulation)
Vol. 109
Issue 7
Pg. 911-9
(Feb 24 2004)
ISSN: 1524-4539 [Electronic] United States |
PMID | 14757694
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Angiotensin II Type 1 Receptor Blockers
- Receptors, Adrenergic, beta
- Ryanodine Receptor Calcium Release Channel
- Tetrazoles
- Angiotensin II
- Dobutamine
- Valsartan
- Cyclic AMP
- Cyclic AMP-Dependent Protein Kinases
- Tacrolimus Binding Proteins
- tacrolimus binding protein 1B
- Calcium-Transporting ATPases
- Valine
- Norepinephrine
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Topics |
- Angiotensin II
(antagonists & inhibitors)
- Angiotensin II Type 1 Receptor Blockers
- Animals
- Calcium Signaling
(drug effects)
- Calcium-Transporting ATPases
(metabolism)
- Cardiac Pacing, Artificial
(adverse effects)
- Cyclic AMP
(metabolism)
- Cyclic AMP-Dependent Protein Kinases
(metabolism)
- Dobutamine
(pharmacology)
- Dogs
- Drug Evaluation, Preclinical
- Heart Failure
(drug therapy, etiology, physiopathology)
- Myocardial Contraction
(drug effects)
- Norepinephrine
(metabolism)
- Phosphorylation
- Protein Processing, Post-Translational
- Receptors, Adrenergic, beta
(metabolism)
- Ryanodine Receptor Calcium Release Channel
(metabolism)
- Sarcoplasmic Reticulum
(drug effects, physiology)
- Tachycardia, Ventricular
(etiology, physiopathology)
- Tacrolimus Binding Proteins
(metabolism)
- Tetrazoles
(pharmacology, therapeutic use)
- Valine
(analogs & derivatives, pharmacology, therapeutic use)
- Valsartan
- Ventricular Remodeling
(drug effects)
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