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Jpn Circ J. 2000 Feb;64(2):117-20.
Improvement in fatty acid utilization in relation to a change in left ventricular hypertrophy in spontaneously hypertensive rats.

Ono T, Kohya T, Tsukamoto E, Mochizuki T, Itoh K, Itoh Y, Tomita F, Tamaki N, Kitabatake A.

Department of Cardiovascular Medicine, Hokkaido University School of Medicine, Sapporo, Japan.

Although fatty acid metabolism is reportedly impaired in myocardial hypertrophy, it is unclear whether the antihypertensive drugs are associated with improved fatty acid metabolism. In order to evaluate the effects of antihypertensive drugs on fatty acid metabolism and myocardial perfusion, the simultaneous uptake of iodine-125(125I)-15-(p-iodophenyl)-3-(R,S)-methylpentadecanoic acid (BMIPP) and thallium-201 (Tl) were measured in 3 groups of rats: (1) spontaneously hypertensive rats (SHR) without treatment (SHR-N), (2) SHR chronically treated with captopril (SHR-C), and (3) SHR chronically treated with hydralazine (SHR-H). Captopril and hydralazine were administered to their respective groups for 3 weeks from 12 weeks of age. The hearts were removed 10 min after simultaneous intravenous injections of BMIPP and Tl and the 125I and 201Tl counts were measured to calculate the uptake ratio. The systolic blood pressure (SBP) in SHR-N was 222+/-10 mm Hg, whereas the SHR-C and SHR-H groups showed significant SBP reduction (156+/-11, and 158+/-10 mm Hg, respectively) (p<0.01 each). The heart/bodyweight ratio was significantly lower in SHR-C (2.48+/-0.09) than in SHR-N (2.74+/-0.11) (p<0.05). However, there was no significant difference in the heart/bodyweight ratio between SHR-N and SHR-H (2.65+/-0.09). The ratio of BMIPP uptake to Tl uptake (BMIPP/Tl) was significantly higher in SHR-C (0.71+/-0.13) than in SHR-N (0.50+/-0.09) (p<0.05). However, BMIPP/Tl in SHR-H (0.53+/-0.09) was similar to that in SHR-N. These results suggest that captopril improves fatty acid metabolism in the hypertrophied ventricle in SHR. The metabolic alterations may improve with left ventricular hypertrophy regression but are not effected by the reduction of blood pressure only.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10716525&dopt=Abstract

mc.duke.edu

Medications used to treat cardiovascular diseases such as congestive heart failure, high blood pressure, and arrhythmia, are prescribed extensively in Western countries. However, taste complaints are common side effects of many of these cardiovascular medications. Although clinical observations are helpful in determining potential taste problems from a medication, experimental studies are necessary to obtain quantitative data on taste. In the studies performed here, nine cardiovascular medications (labetalol HCl, captopril, diltiazem HCl, enalapril maleate, hydrochlorothiazide, propranolol HCl, mexiletine HCl, procainamide HCl, and propafenone HCl) were applied to the tongue in human volunteers to measure the direct effect of these drugs on taste receptors. The medications were applied topically to the tongue surface of both young and elderly subjects to mimic the situation in which the drug is secreted into the saliva. Detection thresholds ranged from 0.048 mM (propafenone) to 0.438 mM (procainamide). The detection thresholds of healthy elderly subjects did not significantly differ from young controls. The compounds tested had a predominantly bitter taste with other qualities as well. In addition, topical application of the medications to the tongue affected the taste of one or more taste stimuli, with medications differing in the pattern of taste effects exhibited. The mechanism of taste effects is not fully known, but the results of this study suggest one route may be due to medications' effect on peripheral taste receptors.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10716552&dopt=Abstract

J Hypertens. 1993 Oct;11(10):1053-9.
Vascular conversion of angiotensin I in stroke-prone spontaneously hypertensive and Wistar-Kyoto rats.

Hilgers KF, Veelken R, Mai M, Ganten U, Ganten D, Luft FC, Mann JF.

Department of Medicine-Nephrology, University of Erlangen-Nuremberg, Germany.

OBJECTIVE: Linkage studies have shown that the gene locus for angiotensin converting enzyme (ACE) is associated with the expression of hypertension in stroke-prone spontaneously hypertensive rats (SHRSP). We tested the hypothesis that the conversion of angiotensin I (Ang I) to angiotensin II (Ang II) in blood vessels is elevated in SHRSP. DESIGN: We measured the conversion rate of Ang I to Ang II during one pass through an isolated resistance vessel bed. We used the same substrains of SHRSP and Wistar-Kyoto control rats (WKY) that had been employed in the earlier linkage studies. METHODS: Isolated hindquarters from young and adult (10- to 12- and 36- to 38-week-old) rats were perfused with an artificial medium and then infused with Ang I at 0.5 and 2 pmol/ml. Ang I and II were measured with high-performance liquid chromatography and radioimmunoassay in hindquarter effluent and in blank control channels. Conversion and extraction rates were calculated from angiotensin levels in hindquarter and blank perfusion channels, respectively. RESULTS: The conversion rates of Ang I to Ang II did not differ between SHRSP and WKY in young or in adult rats. Captopril completely abolished the formation of Ang II in all groups of rats. During infusion at the higher dose of Ang I, the extraction of Ang I was significantly decreased in SHRSP compared with WKY. CONCLUSIONS: Our results are consistent with the notion that the metabolism of angiotensin is decreased in spontaneously hypertensive rats. However, we found no support for the hypothesis that vascular ACE is responsible for high blood pressure in SHRSP. These findings suggest that other genes close to the ACE locus or the hyperexpression of the enzyme in other areas may contribute to hypertension in these rats.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8258668&dopt=Abstract

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