EFFECT OF PALMITIC ACID AND FATTY-ACID BINDING-PROTEIN ON VENTRICULAR-FIBRILLATION THRESHOLD IN THE PERFUSED RAT-HEART

被引：33

作者：

MAKIGUCHI, M ^{[1
]}

KAWAGUCHI, H ^{[1
]}

TAMURA, M ^{[1
]}

YASUDA, H ^{[1
]}

机构：

[1] HOKKAIDO UNIV,SCH MED,DEPT CARDIOVASC MED,SAPPORO,HOKKAIDO 060,JAPAN

来源：

CARDIOVASCULAR DRUGS AND THERAPY | 1991年 / 5卷 / 04期

关键词：

FREE FATTY ACID; FATTY ACID BINDING PROTEIN; VENTRICULAR FIBRILLATION THRESHOLD; CALCIUM OVERLOAD;

D O I：

10.1007/BF03029751

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

The effects of increased free fatty acid (FFA) levels on ventricular arrhythmias remain controversial. Using ventricular fibrillation threshold (VFT), we examined the relationship between FFA levels and ventricular arrhythmias. Isolated rat hearts were perfused with palmitate bound to either albumin or fatty acid binding protein (FABP) by Langendorf's method. The VFT was determined by electrical stimulation. Perfusion with 0.12 mM albumin alone, 0.12 mM palmitate bound to 0.12 mM albumin, and 0.36 mM palmitate bound to 0.12 mM albumin did not lower the VFT significantly. However, 0.60 mM palmitate bound to 0.12 mM albumin lowered VFT from 2.19 +/- 0.20 mA to 1.56 +/- 0.13 mA. The perfusion of 0.36 mM palmitate bound to 0.12 mM FABP lowered the VFT from 2.05 +/- to 0.19 mA to 1.47 +/- 0.23 mA, but 0.12 mM FABP alone did not affect the VFT. Perfusion with 0.36 mM palmitate bound to 0.12 mM FABP caused the VFT to fall more than perfusion with 0.36 mM palmitate bound to 0.12 mM albumin. Then the effects of verapamil perfusion or a low concentration of perfusate Ca2+ on VFT were examined. VFT was determined by electrical stimulation. Palmitate (0.6 mM) bound to 0.12 mM albumin lowered VFT. Verapamil 10(-7) M perfusion and a low concentration of Ca2+ (Ca2+ 1.67 mM) suppressed the FFA-induced fall of VFT. These results suggested that the arrhythmogenic action of FFA was related to Ca2+ overload in myocardial cells.

引用

页码：753 / 761

页数：9

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