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The mitochondria as a target for cardioprotection in acute myocardial ischemia
Offir Ertracht1, Assaf Malka2, Shaul Atar3
1The Eliachar Research Laboratory, Western Galilee Medical Center, Nahariya, Israel.
Abstract:
The ischemic heart suffers from nutrient deprivation, lack of oxygen, metabolic acidosis, hyperkalemia and Ca(2+) overload as well as high level of reactive oxygen species (ROS) generation; these risk factors endanger the cardiomyoctes and may cause their demise. Nevertheless, the treatment of acute myocardial infarction includes reperfusion, although it can exacerbate the effects of ischemia since resumption of blood supply to the ischemic myocardium is associated with increased ROS production. In the past 20 years, preconditioning and postconditioning were revealed, directing research efforts at finding pharmacological agents that can mimic these techniques. Soon thereafter, the involvement of several molecular pathways such as the reperfusion injury salvage kinase, the ATP-sensitive K(+) channel, the survivor-activating factor enhancement and the adenosine mono phosphate activated protein kinase pathways were discovered. Further, studies have shown that these pathways convey the adverse effects of ischemia, reperfusion and the combination thereof to the mitochondria, suggesting that the death signals during ischemia and reperfusion are controllable, and can therefore be partially inhibited or even reversed. Hence, the aim of this review is to describe these signaling pathways, the established pre-clinical means to manipulate them, and their current application status in the clinic.
Insights
Protecting the heart during myocardial infarction involves understanding how ischemia and reperfusion damage cells. Research focuses on molecular pathways to develop treatments that mimic protective techniques like preconditioning and postconditioning.
Area of Science:
- Cardiology
- Molecular Biology
- Biochemistry
Background:
- Ischemic heart disease involves nutrient deprivation, hypoxia, acidosis, and oxidative stress, endangering cardiomyocytes.
- Reperfusion therapy for myocardial infarction can paradoxically increase reactive oxygen species (ROS) production, exacerbating injury.
- Preconditioning and postconditioning techniques have emerged as protective strategies, stimulating research into pharmacological mimics.
Purpose of the Study:
- To review molecular signaling pathways involved in ischemia-reperfusion injury.
- To discuss pre-clinical methods for manipulating these pathways.
- To evaluate the current clinical application status of these interventions.
Main Methods:
- Literature review of signaling pathways.
- Analysis of pre-clinical studies on pharmacological agents.
- Assessment of clinical trial data and therapeutic applications.
Main Results:
- Identification of key pathways: reperfusion injury salvage kinase (RISK), ATP-sensitive K(+) channel (KATP), survivor-activating factor enhancement (SAFE), and adenosine monophosphate-activated protein kinase (AMPK).
- Demonstration that these pathways transmit damage signals to mitochondria.
- Evidence suggests ischemia-reperfusion-induced cell death signals are controllable and potentially reversible.
Conclusions:
- Signaling pathways offer therapeutic targets for mitigating ischemia-reperfusion injury.
- Pharmacological agents mimicking preconditioning/postconditioning show promise.
- Further clinical translation is needed to fully harness these protective strategies.
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