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A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation
Published on: July 13, 2018
Mitochondrial function in cardiomyocytes: target for cardioprotection
Dipak K Das1, Nilanjana Maulik
1Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, Connecticut 06030-1110, USA. ddas@neuron.uchc.edu
Insights
Mitochondria control cardiac cell life and death through bioenergetics and redox signaling. These organelles manage cell survival signals, influencing outcomes in heart disease.
Area of Science:
- Cardiovascular Biology
- Cellular Biology
- Mitochondrial Function
Background:
- Cardiac diseases involve cell death (necrosis, apoptosis).
- Mitochondria are central to regulating cell survival and death pathways.
- Understanding mitochondrial roles is crucial for treating heart conditions.
Purpose of the Study:
- To review mechanisms of mitochondrial control over cardiac cell life and death.
- To summarize current knowledge on how mitochondria influence cell fate decisions.
Main Methods:
- Literature review of scientific articles on mitochondria and cardiac cell death.
- Analysis of factors regulating mitochondrial function and cell survival signals.
Main Results:
- Mitochondrial bioenergetics and permeability transition pore are key regulators.
- Redox-sensitive genes (e.g., Bcl-2, Bax, NF-κB) modulate mitochondrial decisions.
- Mitochondrial reactive oxygen species act as both damaging agents and signaling molecules.
Conclusions:
- Mitochondria dictate cardiac cell fate via bioenergetics, pore dynamics, and gene regulation.
- Redox signaling plays a critical role in mitochondrial life-or-death decisions for cardiac cells.
Purpose Of Review:
Cardiac diseases including ischemic heart disease, cardiomyopathy, hypertension, atherosclerosis and congestive heart failure are associated with cardiac cell death as a result of both necrosis and apoptosis. Mitochondria play an essential role in deciding whether a cell lives or dies. This review summarizes current knowledge on the mechanisms by which mitochondria exert such decision-making power.
Recent Findings:
A wide variety of factors, either directly or indirectly, function in a synchronized manner to regulate the death versus survival signals. Mitochondrial bioenergetics and permeability transition pore plays a crucial role in this process, although several redox-sensitive genes, proteins and transcription factors, such as Bcl-2, Bax, nuclear factor kappa B, regulate the decision-making power of mitochondria, which have the final authority to decide whether a cell lives or dies. Mitochondrially generated reactive oxygen species are critically involved in the decision-making process, by functioning both as executioner by damaging the biomolecules, or as savior by virtue of their ability to perform redox signaling.
Summary:
It appears that mitochondria regulate the life and death of cardiac cells by manipulating several factors, including bioenergetics, mitochondrial permeability transition pore and redox-sensing genes. Redox signaling is likely to be critically involved in this process.
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