Abstract
Remote ischemic preconditioning (RIPC) induces a prolonged late phase of multi-organ protection against ischemia–reperfusion (IR) injury. In the present study, we tested the hypothesis that RIPC confers late protection against myocardial IR injury by upregulating expression of interleukin (IL)-10. Mice were exposed to lower limb RIPC or sham ischemia. After 24 h, mice with RIPC demonstrated decreased myocardial infarct size and improved cardiac contractility following 30-min ischemia and 120-min reperfusion (I-30/R-120). These effects of RIPC were completely blocked by anti-IL-10 receptor antibodies. In IL-10 knockout mice, RIPC cardioprotection was lost, but it was mimicked by exogenous IL-10. Administration of IL-10 to isolated perfused hearts increased phosphorylation of the protein kinase Akt and limited infarct size after I-30/R-120. In wild-type mice, RIPC increased plasma and cardiac IL-10 protein levels and caused activation of Akt and endothelial nitric oxide synthase in the heart at 24 h, which was also blocked by anti-IL-10 receptor antibodies. In the gastrocnemius muscle, RIPC resulted in immediate inactivation of the phosphatase PTEN and activation of Stat3, with increased IL-10 expression 24 h later. Myocyte-specific PTEN inactivation led to increased Stat3 phosphorylation and IL-10 protein expression in the gastrocnemius muscle. Taken together, these results suggest that RIPC induces late protection against myocardial IR injury by increasing expression of IL-10 in the remote muscle, followed by release of IL-10 into the circulation, and activation of protective signaling pathways in the heart. This study provides a scientific basis for the use of RIPC to confer systemic protection against IR injury.
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Abbreviations
- eNOS:
-
Endothelial nitric oxide synthase
- IL-10R1:
-
Interleukin 10 receptor subunit 1
- IS:
-
Infarct size
- IR:
-
Ischemia–reperfusion
- LVDP:
-
Left ventricular developed pressure
- LY:
-
LY294002
- PI3K:
-
Phosphatidylinositol-3-kinase
- PTEN:
-
Phosphatase and tensin homologue deleted on chromosome ten
- PKO:
-
Myocyte-specific PTEN knockout
- RA:
-
Anti-IL-10 receptor antibody
- RIPC:
-
Remote ischemic preconditioning
- Stat3:
-
Signal transducer and activator of transcription 3
- STI:
-
Stat3 inhibitor
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This work was supported by Public Health Service grants HL88071 (to Z.P. Cai) and HL65608 (to L.C. Becker) from the National Heart, Lung and Blood Institute, National Institutes of Health.
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Cai, Z.P., Parajuli, N., Zheng, X. et al. Remote ischemic preconditioning confers late protection against myocardial ischemia–reperfusion injury in mice by upregulating interleukin-10. Basic Res Cardiol 107, 277 (2012). https://doi.org/10.1007/s00395-012-0277-1
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DOI: https://doi.org/10.1007/s00395-012-0277-1