Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases
α-ketoglutarate dehydrogenase complex (KGDHc) is a crucial enzyme in the tricarboxylic acid (TCA) cycle that intersects monosaccharides, amino acids, and fatty acid catabolism with oxidative phosphorylation (OxPhos). A key feature of KGDHc is its ability to sense changes in the redox environment thr...
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2025-04-01
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| author | Ryan J. Mailloux |
| author_facet | Ryan J. Mailloux |
| author_sort | Ryan J. Mailloux |
| collection | DOAJ |
| description | α-ketoglutarate dehydrogenase complex (KGDHc) is a crucial enzyme in the tricarboxylic acid (TCA) cycle that intersects monosaccharides, amino acids, and fatty acid catabolism with oxidative phosphorylation (OxPhos). A key feature of KGDHc is its ability to sense changes in the redox environment through the reversible oxidation of the vicinal lipoic acid thiols of its dihydrolipoamide succinyltransferase (DLST; E2) subunit, which controls its activity and, by extension, OxPhos. This characteristic inculcates KGDHc with redox regulatory properties for the modulation of metabolism and mediating of intra- and intercellular signals. The innate capacity of KGDHc to participate in the regulation of cell redox homeodynamics also occurs through the production of mitochondrial hydrogen peroxide (mtH<sub>2</sub>O<sub>2</sub>), which is generated by the dihydrolipoamide dehydrogenase (DLD; E3) downstream from the E2 subunit. Reversible covalent redox modification of the E2 subunit controls this mtH<sub>2</sub>O<sub>2</sub> production by KGDHc, which not only protects from oxidative distress but also modulates oxidative eustress pathways. The importance of KGDHc in modulating redox homeodynamics is underscored by the pathogenesis of neurological and metabolic disorders that occur due to the hyper-generation of mtH<sub>2</sub>O<sub>2</sub> by this enzyme complex. This also implies that the targeted redox modification of the E2 subunit could be a potential therapeutic strategy for limiting the oxidative distress triggered by KGDHc mtH<sub>2</sub>O<sub>2</sub> hyper-generation. In this short article, I will discuss recent findings demonstrating KGDHc is a potent mtH<sub>2</sub>O<sub>2</sub> source that can trigger the manifestation of several neurological and metabolic diseases, including non-alcoholic fatty liver disease (NAFLD), inflammation, and cancer, and the targeted redox modification of the E2 subunit could alleviate these syndromes. |
| format | Article |
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| institution | DOAJ |
| issn | 2073-4409 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Cells |
| spelling | doaj-art-3abd67d35bad4c698e145df0b57225d82025-08-20T02:58:47ZengMDPI AGCells2073-44092025-04-0114965310.3390/cells14090653Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human DiseasesRyan J. Mailloux0School of Human Nutrition, McGill University, 21111 Lakeshore Road, Sainte-Anne-de-Bellevue, Quebec, QC H9X 3V9, Canadaα-ketoglutarate dehydrogenase complex (KGDHc) is a crucial enzyme in the tricarboxylic acid (TCA) cycle that intersects monosaccharides, amino acids, and fatty acid catabolism with oxidative phosphorylation (OxPhos). A key feature of KGDHc is its ability to sense changes in the redox environment through the reversible oxidation of the vicinal lipoic acid thiols of its dihydrolipoamide succinyltransferase (DLST; E2) subunit, which controls its activity and, by extension, OxPhos. This characteristic inculcates KGDHc with redox regulatory properties for the modulation of metabolism and mediating of intra- and intercellular signals. The innate capacity of KGDHc to participate in the regulation of cell redox homeodynamics also occurs through the production of mitochondrial hydrogen peroxide (mtH<sub>2</sub>O<sub>2</sub>), which is generated by the dihydrolipoamide dehydrogenase (DLD; E3) downstream from the E2 subunit. Reversible covalent redox modification of the E2 subunit controls this mtH<sub>2</sub>O<sub>2</sub> production by KGDHc, which not only protects from oxidative distress but also modulates oxidative eustress pathways. The importance of KGDHc in modulating redox homeodynamics is underscored by the pathogenesis of neurological and metabolic disorders that occur due to the hyper-generation of mtH<sub>2</sub>O<sub>2</sub> by this enzyme complex. This also implies that the targeted redox modification of the E2 subunit could be a potential therapeutic strategy for limiting the oxidative distress triggered by KGDHc mtH<sub>2</sub>O<sub>2</sub> hyper-generation. In this short article, I will discuss recent findings demonstrating KGDHc is a potent mtH<sub>2</sub>O<sub>2</sub> source that can trigger the manifestation of several neurological and metabolic diseases, including non-alcoholic fatty liver disease (NAFLD), inflammation, and cancer, and the targeted redox modification of the E2 subunit could alleviate these syndromes.https://www.mdpi.com/2073-4409/14/9/653KGDHcoxidative eustressoxidative distresssuccinateNAFLDmitochondria |
| spellingShingle | Ryan J. Mailloux Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases Cells KGDHc oxidative eustress oxidative distress succinate NAFLD mitochondria |
| title | Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases |
| title_full | Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases |
| title_fullStr | Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases |
| title_full_unstemmed | Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases |
| title_short | Targeted Redox Regulation α-Ketoglutarate Dehydrogenase Complex for the Treatment of Human Diseases |
| title_sort | targeted redox regulation α ketoglutarate dehydrogenase complex for the treatment of human diseases |
| topic | KGDHc oxidative eustress oxidative distress succinate NAFLD mitochondria |
| url | https://www.mdpi.com/2073-4409/14/9/653 |
| work_keys_str_mv | AT ryanjmailloux targetedredoxregulationaketoglutaratedehydrogenasecomplexforthetreatmentofhumandiseases |