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Updated: Sep 25, 2025

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Published on: July 20, 2022
Why succinate? Physiological regulation by a mitochondrial coenzyme Q sentinel
Michael P Murphy1,2, Edward T Chouchani3,4
1Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK. mpm@mrc-mbu.cam.ac.uk.
Succinate, a citric acid cycle metabolite, acts as a signaling molecule. Its levels reflect mitochondrial redox state, communicating cellular energy status throughout the body.
Area of Science:
- Biochemistry
- Cellular Metabolism
- Mitochondrial Biology
Background:
- Metabolites traditionally viewed as energy-cycle intermediates possess regulatory roles.
- Succinate, a citric acid cycle intermediate, exhibits diverse functions, significant concentration shifts, and controlled release.
Purpose of the Study:
- To propose succinate as a signaling molecule.
- To elucidate the link between succinate levels and the coenzyme Q (CoQ) pool's redox state.
- To explain how succinate communicates mitochondrial bioenergetic status.
Main Methods:
- Bioenergetic analysis
- Metabolomic profiling
- Mitochondrial redox state assessment
Main Results:
- Succinate concentration correlates with the CoQ pool redox state.
- CoQ redox state integrates electron supply, oxygen levels, and ATP demand.
- Succinate acts as a conduit for mitochondrial bioenergetic information.
Conclusions:
- Succinate functions as a signaling modality.
- Succinate communicates mitochondrial energy status within and between cells.
- This regulatory mechanism explains emerging roles of succinate and guides future research.
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