EFFECTS OF L-CARNITINE ON TISSUE LEVELS OF ACYL CARNITINE, ACYL COENZYME A AND HIGH ENERGY PHOSPHATE IN ISCHEMIC DOG HEARTS
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概要
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In order to evaluate the protective effects of L-carnitine on ischemic myocardium, its effects on tissue levels of acyl carnitine, acyl coenzyme A (CoA) and high energy phosphate were studied in ischemic dog hearts. Myocardial ischemia was induced by the ligation of left anterior descending coronary artery for 15 minutes. L-carnitine ( 100 mg/kg) was administered intravenously prior to coronary ligation. In ischemic myocardium, tissue levels of free carnitine decreased from 1043 ± 358 to 623 ± 180 n mol/g (p<0.001). On the other hand, long chain acyl carnitine increased from 214 ± 54 to 498 ± 149 n mol/g (p<0.001) and long chain acyl CoA increased from 15.7 ± 4.8 to 23.2 ± 5.4 n mol/g (p<0.01 ). Pretreatment of L-carnitine increased tissue levels of free carnitine to 863 ± 318 n mol/g (p<0.005) and decreased long chain acyl carnitine and long chain acyl CoA to 368 ±128 n mol/g (p<0.02) and 19.2 ± 6.5 n mol/g (p<0.1) respectively. Tissue levels of adenosine triphosphate (ATP) that was reduced by myocardial ischemia from 5.43± 0.67 to 2.80 ± 0.58 μ mol/g (p<0.001) was increased to 3.28 ± 0.63 μ mol/g (p< 0.02) by L-carnitine. Positive correlation was observed between ATP and free carnitine (p<0.01). On the other hand, negative correlation was observed not only between ATP and the ratio of long chain acyl CoA to free carnitine but also between ATP and the ratio of long chain acyl carnitine to free carnitine (p<0.01 respectively). These results suggest that the accumulation of long chain acyl carnitine may play an important role on cellular damage in ischemic myocardium and that administration of exogenous L-carnitine is beneficial for the protection of ischemic myocardium, probably because it reduces the accumulation of long chain acyl carnitine as well as long chain acyl CoA.
- 社団法人日本循環器学会の論文
- 1981-06-20
著者
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Yamazaki Noboru
The Third Department of Internal Medicine
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Kobayashi Akira
The Department Of Medicine Iii Hamamatsu University School Of Medicine
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Kobayashi Akira
The Third Department Of Internal Medicine Hamamatsu University School Of Medicine
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Suzuki Yoshikazu
The Third Department Of Internal Medicine Hamamatsu University School Of Medicine
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Kamikawa Tadashi
The Third Department Of Internal Medicine Hamamatsu University School Of Medicine
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Masumura Yoshinori
The Third Department Of Internal Medicine Hamamatsu University School Of Medicine
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Suzuki Yoshikazu
The 2nd Dept. Of Intern Med. Nagoya Univ. School. Of Med.
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