期刊
MOLECULAR AND CELLULAR BIOCHEMISTRY
卷 248, 期 1-2, 页码 209-215出版社
SPRINGER
DOI: 10.1023/A:1024165125139
关键词
Langendorff perfusion; ischemia-reperfusion; cardioprotection; left ventricular developed pressure; left ventricular end-diastolic pressure
类别
Lysophosphatidylcholine (LPC) accumulates in myocardial tissues and coronary sinus during ischemia, and plays important role in the development of ischemia-reperfusion injury and ischemic ventricular arrhythmia. The aim of this study was to examine whether pretreatment of poloxamer 188 (P-188), a nonionic and non-toxic surfactant, can prevent the cardiac dysfunction induced by exogenous LPC perfusion in Langendorff perfused rat heart model. LPC ( 6 muM) significantly ( p < 0.05) decreased heart rate (HR) and left ventricular developed pressure (LVDP) from 274.3 +/- 23.2 to 175.0 +/- 42.9/ min and from 115.9 +/- 11.3 to 26.7 +/- 7.1 mmHg, respectively. The LPC-induced reduction of HR and LVDP did not recover by washout of LPC. Pretreatment with P-188 ( 1 mM for 30 min) inhibited completely the LPC-induced decreases of HR and LVDP. The pretreatment with P-188 also prevented the LPC-induced increases of left ventricular end-diastolic pressure ( LVEDP) and GOT release, significantly ( p < 0.05). The coronary perfusion pressure (CPP) rose ( p < 0.01) by the LPC perfusion from 71.9 +/- 5.3 to 121.9 +/- 13.0 mmHg, significantly, but pretreatment of P-188 did not affect the LPC-induced vasoconstriction. Our results suggest that exogenous LPC causes irreversible cardiac injury by the sarcolemmal membrane disruption followed by Ca overload, and this LPC-induced cardiac injury, probably, can be prevented by the pretreatment with poloxamer 188.
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