TITLE

Increasing Glutamate Promotes Ischemia-Reperfusion-Induced Ventricular Arrhythmias in Rats in vivo

AUTHOR(S)
Sun, Xianlin; Zhong, Jingquan; Wang, Deguo; Xu, Jian; Su, Hao; an, Chunsheng; Zhu, Hongjun; Yan, Ji
PUB. DATE
March 2014
SOURCE
Pharmacology;Mar2014, Vol. 93 Issue 1/2, p4
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Glutamate mediates cerebral ischemia injury via N-methyl-D-aspartate (NMDA) receptor-coupled ion channels, but the activities of glutamate in the heart remain unclear. Aims: To investigate whether or not glutamate contributes to ischemia- and reperfusion (IR)-induced arrhythmias. Methods: Myocardial IR was induced by occlusion of the left anterior descending coronary artery for 30 min and reperfusion for another 30 min. A score system was used to quantify arrhythmias. MK801 (a noncompetitive NMDA receptor antagonist), dihydrokainate (DHK, a glutamate transporter inhibitor) and gabapentin (GBP, a glutamate release inhibitor) were used before ischemia. Serum glutamate levels, Ca2+-ATPase activity, SERCA2a protein expression and myocardial mitochondrial Ca2+ content were assayed. Results: Myocardial IR caused a significant increase in serum glutamate and high incidences of ventricular arrhythmias. GBP and MK801 significantly ameliorated ventricular arrhythmias, improved SERCA2a expression and sarcoplasmic reticulum Ca2+-ATPase activity and reduced Ca2+ accumulated in mitochondria. By contrast, DHK significantly exacerbated reperfusion-related arrhythmias and mitochondrial Ca2+ overload while it decreased SERCA2a expression and activity. Conclusion: This study showed that glutamate mediates reperfusion arrhythmias, and the corresponding mechanism may be associated with Ca2+ overload via the NMDA receptor. Reperfusion arrhythmias may be prevented by inhibiting the release of glutamate or by antagonizing NMDA receptors. © 2013 S. Karger AG, Basel
ACCESSION #
94871771

 

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