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Cited by 255

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Ischemic Postconditioning in Pigs: No Causal Role for RISK Activation

Skyschally, Andreas, van Caster, Patrick, Boengler, Kerstin, Gres, Petra, Musiolik, Judith, Schilawa, Dustin, Schulz, Rainer, Heusch, Gerd·2009·Circulation Research

Abstract

Ischemic postconditioning (IPoC) reduces infarct size following ischemia/reperfusion. Whether or not phosphorylation of RISK (reperfusion injury salvage kinases) (AKT, ERK1/2, P70S6K, GSK3β) is causal for protection by IPoC is controversial. We therefore studied the impact of RISK on IPoC in anesthetized pigs subjected to 90 minutes of left anterior descending coronary artery hypoperfusion and 120 minutes of reperfusion. In protocol 1, IPoC, by 6 cycles of 20/20 seconds of reperfusion/reocclusion (n=13), was compared with immediate full reperfusion (IFR) (n=15). In protocol 2, IPoC (n=4) or IFR (n=4) was performed with pharmacological RISK blockade by IC coinfusion of Wortmannin and U0126. Infarct size was determined by TTC staining, and the expression of phosphorylated RISK proteins by Western blot analysis in biopsies. In protocol 1, infarct size was 20±3% (percentage of area at risk; mean±SEM) with IPoC and 33±4% ( P <0.05) with IFR. RISK phosphorylation increased with reperfusion but was not different between IPoC and IFR. In protocol 2, Wortmannin and U0126 blocked the increases in RISK phosphorylation during reperfusion, but infarct size was still smaller with IPoC (15±7%) than with IFR (35±6%; P <0.05).

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Metadata

Authors
Skyschally, A., van Caster, P., Boengler, K., Gres, P., Musiolik, J., Schilawa, D., Schulz, R., & Heusch, G.
Venue
Circulation Research
Published
2009-01-02
Volume
104
Issue
1
Pages
15-18
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2143762484
Cited by
255
References
50
FWCI
27.17
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Ischemic Postconditioning in Pigs: No Causal Role for RISK Activation. https://app.cochat.ai/papers/10.1161/circresaha.108.186429
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Skyschally, A., van Caster, P., Boengler, K., Gres, P., Musiolik, J., Schilawa, D., Schulz, R., & Heusch, G. (2009). Ischemic Postconditioning in Pigs: No Causal Role for RISK Activation. Circulation Research. https://doi.org/10.1161/circresaha.108.186429

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