Inhibition of type 2A secretory phospholipase A₂ reduces death of cardiomyocytes in acute myocardial infarction

During acute myocardial infarction (AMI), ischemia leads to necrotic areas surrounded by border zones of reversibly damaged cardiomyocytes, showing membrane flip-flop. During reperfusion type IIA secretory phopholipase A₂ (sPLA₂-IIA) induces direct cell-toxicity and facilitates binding of other infl...

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Veröffentlicht in:Apoptosis (London) 2009-06, Vol.14 (6), p.753-763
Hauptverfasser: van Dijk, Annemieke, Krijnen, Paul A. J, Vermond, Rob A, Pronk, Amanda, Spreeuwenberg, Marieke, Visser, Frans C, Berney, Richard, Paulus, Walter J, Hack, C. Erik, van Milligen, Florine J, Niessen, Hans W. M
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container_title Apoptosis (London)
container_volume 14
creator van Dijk, Annemieke
Krijnen, Paul A. J
Vermond, Rob A
Pronk, Amanda
Spreeuwenberg, Marieke
Visser, Frans C
Berney, Richard
Paulus, Walter J
Hack, C. Erik
van Milligen, Florine J
Niessen, Hans W. M
description During acute myocardial infarction (AMI), ischemia leads to necrotic areas surrounded by border zones of reversibly damaged cardiomyocytes, showing membrane flip-flop. During reperfusion type IIA secretory phopholipase A₂ (sPLA₂-IIA) induces direct cell-toxicity and facilitates binding of other inflammatory mediators on these cardiomyocytes. Therefore, we hypothesized that the specific sPLA₂-IIA-inhibitor PX-18 would reduce cardiomyocyte death and infarct size in vivo. Wistar rats were treated with PX-18 starting minutes after reperfusion, and at day 1 and 2 post AMI. After 28 days hearts were analyzed. Furthermore, the effect of PX-18 on membrane flip-flop and apoptosis was investigated in vitro. PX-18 significantly inhibited sPLA₂-IIA activity and reduced infarct size (reduction 73 ± 9%, P < 0.05), compared to the vehicle-treated group, without impairing wound healing. In vitro, PX-18 significantly reduced reversible membrane flip-flop and apoptosis in cardiomyocytes. However, no sPLA₂-IIA activity could be detected, suggesting that PX-18 also exerted a protective effect independent of sPLA₂-IIA. In conclusion, PX-18 is a potent therapeutic to reduce infarct size by inhibiting sPLA₂-IIA, and possibly also by inhibiting apoptosis of cardiomyocytes in a sPLA₂-IIA independent manner.
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J ; Vermond, Rob A ; Pronk, Amanda ; Spreeuwenberg, Marieke ; Visser, Frans C ; Berney, Richard ; Paulus, Walter J ; Hack, C. Erik ; van Milligen, Florine J ; Niessen, Hans W. M</creator><creatorcontrib>van Dijk, Annemieke ; Krijnen, Paul A. J ; Vermond, Rob A ; Pronk, Amanda ; Spreeuwenberg, Marieke ; Visser, Frans C ; Berney, Richard ; Paulus, Walter J ; Hack, C. Erik ; van Milligen, Florine J ; Niessen, Hans W. M</creatorcontrib><description>During acute myocardial infarction (AMI), ischemia leads to necrotic areas surrounded by border zones of reversibly damaged cardiomyocytes, showing membrane flip-flop. During reperfusion type IIA secretory phopholipase A₂ (sPLA₂-IIA) induces direct cell-toxicity and facilitates binding of other inflammatory mediators on these cardiomyocytes. Therefore, we hypothesized that the specific sPLA₂-IIA-inhibitor PX-18 would reduce cardiomyocyte death and infarct size in vivo. 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subjects Animals
Apoptosis - drug effects
Biochemistry
Biomedical and Life Sciences
Biomedicine
Cancer Research
Caspase 3 - metabolism
Cell Biology
Cell Membrane - drug effects
Cell Membrane - enzymology
Cell Movement - drug effects
Disease Models, Animal
Enzyme Inhibitors - pharmacology
Group II Phospholipases A2 - antagonists & inhibitors
Heart Function Tests
Immunohistochemistry
Macrophages - cytology
Macrophages - drug effects
Macrophages - enzymology
Myocardial infarction
Myocardial Infarction - enzymology
Myocardial Infarction - pathology
Myocardial Infarction - physiopathology
Myocytes, Cardiac - cytology
Myocytes, Cardiac - drug effects
Myocytes, Cardiac - enzymology
Neutrophils - cytology
Neutrophils - drug effects
Neutrophils - enzymology
Oncology
Original Paper
Rats
Rats, Wistar
Simvastatin - pharmacology
Solubility - drug effects
Virology
title Inhibition of type 2A secretory phospholipase A₂ reduces death of cardiomyocytes in acute myocardial infarction
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