Alpha-Ketoglutarate Metabolism in Health and Disease

Alpha-ketoglutarate (α-KG), a central intermediate of the tricarboxylic acid cycle, integrates energy generation, amino acid biosynthesis and redox homeostasis. Intracellular concentrations of α-KG modulate key enzymatic and transcriptional pathways by acting as a co-substrate for 2-oxoglutarate-dependent dioxygenases, which regulate epigenetic marks, collagen hydroxylation and hypoxia-inducible factor activity. In healthy tissues, α-KG balances nutrient oxidation and supports mitochondrial function, antioxidant defence and nitrogen metabolism via glutamate and glutamine synthesis. Dysregulation of α-KG turnover is implicated in diverse pathologies: its depletion contributes to metabolic stress in cancer and immune cells, while exogenous supplementation has shown benefit in inflammatory states, muscle wasting and immunotherapy sensitivity. Aberrant α-KG metabolism in tumours can lead to pseudohypoxia, driving malignant progression. Conversely, restoration of α-KG levels can reprogramme immune cell function, enhance epigenetic remodelling and ameliorate oxidative damage, pointing to its emerging role as a metabolic rheostat and potential therapeutic agent.

Research from Nature Portfolio

Recent studies have revealed that commonly used esterified α-KG analogues undergo rapid spontaneous hydrolysis in aqueous media, releasing authentic α-KG that can directly cross cell membranes. This finding challenges the assumption that ester derivatives are required for cellular uptake and uncovers that cytosolic import of α-KG predominantly fuels nuclear and cytosolic dioxygenase reactions, with only limited contribution to mitochondrial metabolism under standard culture conditions. Moreover, analogue-specific effects on glycolysis and mitochondrial respiration have been uncovered, emphasising the need to revisit experimental design when probing α-KG-dependent signalling and gene regulation.

Alpha-Ketoglutarate Metabolism in Health and Disease publication trend

The graph below shows the total number of articles in alpha-ketoglutarate metabolism in health and disease across all publications each year (not limited to Nature Index journals).

Technical terms

α-Ketoglutarate (α-KG): A five-carbon dicarboxylic acid and key intermediate in the tricarboxylic acid cycle that serves as an energy substrate and co-substrate for dioxygenase enzymes.

Tricarboxylic Acid (TCA) Cycle: A central metabolic pathway in mitochondria that oxidises acetyl-CoA to CO₂, generating NADH, FADH₂ and GTP for ATP synthesis.

2-Oxoglutarate-Dependent Dioxygenases: A family of enzymes that require α-KG and oxygen to hydroxylate substrates, modulating epigenetic and collagen biosynthesis pathways.

Hypoxia-Inducible Factor (HIF): A transcription factor stabilised under low oxygen or by modulation of prolyl hydroxylases, regulating genes involved in angiogenesis, metabolism and cell survival.

Oxidative Phosphorylation (OXPHOS): A mitochondrial process using the electron transport chain and proton gradient to synthesise ATP from ADP and inorganic phosphate.

References

1. Exogenous α-ketoglutarate Modulates Redox Metabolism and Functions of Human Dendritic Cells, Altering Their Capacity to Polarise T Cell Response. International Journal of Biological Sciences (2024).
2. Supplementation with α-ketoglutarate improved the efficacy of anti-PD1 melanoma treatment through epigenetic modulation of PD-L1. Cell Death & Disease (2023).
3. Spontaneous hydrolysis and spurious metabolic properties of α-ketoglutarate esters. Nature Communications (2021).