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Succinate: Function, Metabolism & Significance

Succinate is a key intermediate in energy metabolism and plays a central role in the citric acid cycle found in every human cell.

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Things worth knowing about "Succinate"

Succinate is a key intermediate in energy metabolism and plays a central role in the citric acid cycle found in every human cell.

What is Succinate?

Succinate is the ionized form of succinic acid and one of the most important molecules in human metabolism. It is naturally produced in the body as an intermediate of the citric acid cycle (also known as the Krebs cycle), which takes place in the mitochondria – the energy-producing organelles of the cell. Beyond its metabolic role, succinate also acts as an intracellular and extracellular signaling molecule with a wide range of physiological and pharmacological effects.

Biochemical Function and Mechanism of Action

Within the citric acid cycle, succinate is formed from succinyl-CoA by the enzyme succinyl-CoA synthetase. It is then oxidized to fumarate by the enzyme succinate dehydrogenase (complex II of the mitochondrial respiratory chain), transferring electrons to the cofactor FAD and contributing to ATP synthesis – the primary energy currency of the cell.

Beyond energy production, succinate fulfills several important signaling functions:

Immune modulation: Succinate activates the G protein-coupled receptor SUCNR1 (GPR91) on immune cells, particularly dendritic cells and macrophages, promoting pro-inflammatory responses.
HIF-1α stabilization: Elevated succinate levels inhibit prolyl hydroxylase enzymes, leading to stabilization of hypoxia-inducible factor 1-alpha (HIF-1α) – a transcription factor critical in hypoxia and inflammation.
Epigenetic regulation: Succinate can serve as a substrate for succinylation of proteins, influencing gene expression patterns.

Dietary Sources and Natural Occurrence

Succinate is found naturally in a variety of foods, including:

Aged cheeses (e.g., Parmesan, Gouda)
Wine and beer (as a fermentation by-product)
Certain vegetables such as broccoli and beets
Meat and fish

Within the body, succinate is continuously produced and consumed through the citric acid cycle. Excess succinate can be released into the bloodstream, where it acts as an extracellular signaling molecule.

Medical Significance and Clinical Relevance

Succinate in Inflammatory Diseases

Elevated succinate levels in blood and tissues have been observed in various inflammatory conditions, including rheumatoid arthritis, inflammatory bowel disease, and sepsis. In these settings, succinate acts as a pro-inflammatory signal, enhancing the production of cytokines such as interleukin-1β (IL-1β).

Succinate in Cancer

Mutations in genes encoding subunits of succinate dehydrogenase (SDH) lead to intracellular accumulation of succinate. This accumulation can drive tumorigenesis, particularly in paragangliomas, pheochromocytomas, and certain gastrointestinal stromal tumors (GISTs). In this context, succinate is classified as an oncometabolite.

Succinate in Ischemia-Reperfusion Injury

During oxygen deprivation (ischemia), as occurs during a heart attack or stroke, succinate accumulates in affected tissues. Upon restoration of blood flow (reperfusion), this accumulated succinate is rapidly oxidized, generating reactive oxygen species (ROS) and contributing to so-called reperfusion injury. Targeting this process is an active area of medical research.

Therapeutic and Pharmacological Applications

Succinate and its derivatives are used in various medical and pharmaceutical contexts:

Drug formulation: Many medications are formulated as succinate salts to improve their solubility, stability, and bioavailability (e.g., metoprolol succinate, solifenacin succinate).
Antioxidant properties: In some countries, particularly in Eastern Europe, succinate is used in dietary supplements and infusion solutions to support energy metabolism and as an antioxidant agent.
Food additive: Succinic acid is approved as a food additive (E363) and used as an acidity regulator in food products.

Safety and Tolerability

In physiological amounts, succinate is an endogenous substance with a favorable safety profile. As a food additive or dietary supplement at typical doses, it is considered safe. Therapeutic use should be medically supervised, as elevated succinate levels have been associated with pro-inflammatory effects and oncological changes.

References

Mills E, O'Neill L.A.J. - Succinate: A metabolic signal in inflammation. Trends in Cell Biology, 2014; 24(5): 313-320.
Chouchani E.T. et al. - Ischaemic accumulation of succinate controls reperfusion injury through mitochondrial ROS. Nature, 2014; 515: 431-435.
Baysal B.E. et al. - Mutations in SDHD, a mitochondrial complex II gene, in hereditary paraganglioma. Science, 2000; 287(5454): 848-851.

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