Decreased Expression of Na+/H+ Exchanger Isoform 1 (NHE1) in Non-infarcted Myocardium after Acute Myocardial Infarction
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概要
- 論文の詳細を見る
Although cardiac NHE1 is activated during myocardial ischemia and reperfusion injury, little is known about changes in expression in non-infarcted myocardium after acute myocardial infarction (AMI). The purpose of this study was to examine left ventricular function and region dependent NHE1 expression after myocardial infarction. Therefore, we produced two AMI models in rats, a small infarction model which was continuously ligated at the branches of the left coronary artery, and an extensive infarction model continuously ligated at the root of the artery. We examined NHE1 mRNA expression using RNase protection assay and protein levels using Western blot analysis in non-infarcted myocardium during the 24 hour period after AMI. The level of NHE1 mRNA and protein expression in the whole heart including the infarcted myocardium did not change after a small infarction. On the other hand, in the case of an extensive infarction, the levels of NHE1 mRNA and protein expression decreased significantly by 21.5% (P<0.05) and by 22.0% (P<0.05), respectively, in non-infarcted myocardium. Left ventricular systolic pressure (LVSP) decreased significantly by 13% and 38% with the branch and root ligation, respectively. However, left ventricular end-diastolic pressure (LVEDP) only increased with the root ligation. These results indicate that NHE1 expression decreased in response to extensive myocardial infarction only in non-infarcted myocardium. The present study may be important in furthering the understanding of NHE1 in myocardial infarction and suggests that decreased expression of NHE1 in non-infarcted myocardium may decrease the extent of cardiac cell injury.
- Japanese Heart Journal Associationの論文
著者
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Izumi Tohru
Department Of Cardio-angiology Kitasato University School Of Medicine
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NIWANO Hiroe
Department of Cardio-Angiology, Kitasato University School of Medicine
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Izumi Tohru
北里大学 医療衛生学部リハビリテーション学科
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Masuda Takashi
Department of Rehabilitation, School of Allied Health Sciences, Kitasato University
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Noda Chiharu
Department of Internal Medicine, Kitasato University School of Medicine
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Sato Kiyotaka
Department of Internal Medicine, Kitasato University School of Medicine
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Shimohama Takao
Department of Internal Medicine, Kitasato University School of Medicine
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Suzuki Yoshiro
Physiology, Kitasato University School of Medicine
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Kawahara Katsumasa
Physiology, Kitasato University School of Medicine
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Niwano Hiroe
Department Of Cardio-angiology Kitasato University School Of Medicine
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Noda Chiharu
Department Of Cardio-angiology Kitasato University School Of Medicine
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Suzuki Yoshiro
Physico-medical Department Yokohama City University School Of Medicine
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Masuda Takashi
Departmant Of Emergency & Critical Care Medicine Kitasato University School Of Medicine
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Izumi Tohru
Department Of Angio-cardiology Kitasato University School Of Medicine
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Shimohama Takao
Department Of Angio-cardiology Kitasato University School Of Medicine
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Sato Kiyotaka
Department of Food Technology and Chemistry, Faculty of Fisheries and Animal Husbandry, Hiroshima University
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Shimohama Takao
Departments of Internal Medicine, Kitasato University School of Medicine
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Niwano Hiroe
Departments of Internal Medicine, Kitasato University School of Medicine
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Noda Chiharu
Departments of Internal Medicine, Kitasato University School of Medicine
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Masuda Takashi
Departments of Internal Medicine, Kitasato University School of Medicine
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