ArticleThe Journal of nutritional biochemistry2022
Different forms of vitamin E and metabolite 13'-carboxychromanols inhibit cyclooxygenase-1 and its catalyzed thromboxane in platelets, and tocotrienols and 13'-carboxychromanols are competitive inhibitors of 5-lipoxygenase.
Article in The Journal of nutritional biochemistry, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 20 citations in OpenAlex.
- In Vitro Anti-Inflammatory Activity of Sour Cherry (Prunus cerasus L.) Seed Oil and Computational Safety Profiling.Chemistry & biodiversity · 2026Article
- The effects of different forms of vitamin E on gut microbiota, mechanisms, and implications in disease prevention.The Journal of nutritional biochemistry · 2026Review
- Zeaxanthin and Other Carotenoids: Roles in Abiotic Stress Defense with Implications for Biotic Defense.Plants (Basel, Switzerland) · 2025Review
- Fatty acid metabolism in gouty arthritis: mechanisms to therapeutic targeting.Frontiers in immunology · 2025Review
- Combining vitamin E metabolite 13'-carboxychromanol and a lactic acid bacterium synergistically mitigates colitis and colitis-associated dysbiosis in mice.Free radical biology & medicine · 2025Article
- The use of vitamin E in ocular health: Bridging omics approaches with Tocopherol and Tocotrienol in the management of glaucoma.Food chemistry. Molecular sciences · 2024Article
- Restorative Effect of MicroalgaeInternational journal of molecular sciences · 2023Article
- Effects of Histamine and the α-Tocopherol Metabolite α-13'-COOH in an Atopic Dermatitis Full-Thickness Skin Model.Molecules (Basel, Switzerland) · 2023Article
- Vitamin E (Alpha-Tocopherol) Metabolism and Nutrition in Chronic Kidney Disease.Antioxidants (Basel, Switzerland) · 2022Review
- Metabolism of natural forms of vitamin E and biological actions of vitamin E metabolites.Free radical biology & medicine · 2022Article
- Gamma-tocopherol, a major form of vitamin E in diets: Insights into antioxidant and anti-inflammatory effects, mechanisms, and roles in disease management.Free radical biology & medicine · 2022Article
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3 authors at 1 institution in 1 country.
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Abstract
Cyclooxygenase (COX-1 and COX-2)- and 5-lipoxygenase (5-LOX)-catalyzed biosynthesis of eicosanoids play important roles in inflammation and chronic diseases. The vitamin E family has four tocopherols and tocotrienols. We have shown that the metabolites of δ-tocopherol (δT) and δ-tocotrienol (δTE), i.e., δT-13'-carboxychromanol (COOH) and δTE-13'-COOH, respectively, inhibit COX-1/-2 and 5-LOX activity, but the nature of how they inhibit 5-LOX is not clear. Further, the impact of tocopherols and tocotrienols on COX-1/-2 or 5-LOX activity has not been fully delineated. In this study, we found that tocopherols and tocotrienols inhibited human recombinant COX-1 with IC50s of 1-12 µM, and suppressed COX-1-mediated formation of thromboxane in collagen-stimulated rat's platelets with IC50s of 8-50 µM. None of the vitamin E forms directly inhibited COX-2 activity. 13'-COOHs inhibited COX-1 and COX-2 enzyme activity with IC50s of 3-4 and 4-10 µM, respectively, blocked thromboxane formation in collagen- and ionophore-stimulated rats' platelets with IC50s of 1.5-2.5 µM, and also inhibited COX-2-mediated prostaglandins in stimulated cells. Using enzyme kinetics, we observed that δT-13'-COOH, δTE-13'-COOH and δTE competitively inhibited 5-LOX activity with Ki of 1.6, 0.8 and 2.2 µM, respectively. These compounds decreased leukotriene B
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