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Environmental Science and Pollution... Aug 2023The source of energy for all photoautotrophic organisms is light, which is absorbed by photosynthetic processes and used to transform carbon dioxide and HO into organic...
The source of energy for all photoautotrophic organisms is light, which is absorbed by photosynthetic processes and used to transform carbon dioxide and HO into organic molecules. The majority of UV-B light (280 to 320 nm) is absorbed by stratospheric ozone layer, although some of it does reach at the Earth's surface. Because of the sedentary lifestyle of plants, this form of abiotic stress is unavoidable and can induce growth and even cell death. Ten-day-old calli generated from mature Kirik wheat embryos were subjected to UV-B radiation for 0, 2, 4, and 6 h to examine the function of exogenous α-tocopherol, a lipophilic antioxidant, in wheat tolerance to UV-B radiation stress. The calli were then moved to a callus medium containing α-tocopherol (0, 50, and 100 mg/l) and cultivated there for 20 days after being subjected to UV-B stress. For plant regeneration, embryogenic calli were put on a medium for plant regeneration after 30 days. The findings of this investigation demonstrated that an increase in UV-B exposure period resulted in a substantial drop in the relative growth rate of callus, the rate of embryogenic callus, the rate of responding embryogenic callus, and the number of plants in each explant. On the other hand, with the application of α-tocopherol, all these parameters improved, and the best result was observed in the application of 100 mg/l of α-tocopherol in terms of plant regeneration under UV-B stress.
Topics: alpha-Tocopherol; Triticum; Bread; Antioxidants
PubMed: 37452252
DOI: 10.1007/s11356-023-28768-3 -
Frontiers in Nutrition 2023Although well-documented, the causal relationships between diet-derived circulating antioxidants, oxidative stress, and osteoarthritis (OA) are equivocal. The objective...
BACKGROUND
Although well-documented, the causal relationships between diet-derived circulating antioxidants, oxidative stress, and osteoarthritis (OA) are equivocal. The objective of this study is to employ two-sample Mendelian randomization (MR) to investigate possible causal relationships among dietary-derived circulating antioxidants, oxidative stress damage indicators, and OA risk.
METHODS
Single-nucleotide polymorphisms for diet-derived circulating antioxidants (ascorbate, β-carotene, lycopene, retinol, and α-and γ-tocopherol), assessed as absolute levels and metabolites, as well as oxidative stress injury biomarkers (GSH, GPX, CAT, SOD, albumin, and total bilirubin), were retrieved from the published data and were used as genetic instrumental variables. Summary statistics for gene-OA associations were obtained from publicly available and two relatively large-scale GWAS meta-analyses to date. The inverse-variance weighting method was utilized as the primary MR analysis. Moreover, multivariable MR was used to determine if mediators (BMI and smoking) causally mediated any connection. Furthermore, for each exposure, MR analyses were conducted per outcome database and then meta-analyzed.
RESULTS
Genetically predicted absolute retinol level was causally associated with hip OA risk [odds ratios (ORs) = 0.40, 95% confidence interval (CI) = 0.24-0.68, FDR-corrected = 0.042]. Moreover, genetically predicted albumin level was causally associated with total OA risk (OR = 0.80, 95% CI = 0.75-0.86, FDR-corrected = 2.20E-11), as well as the risk of hip OA (OR = 0.75, 95% CI = 0.68-0.84, FDR-corrected = 1.38E-06) and knee OA (OR = 0.82, 95% CI = 0.76-0.89, FDR-corrected = 4.49E-06). In addition, MVMR confirmed that the effect of albumin on hip OA is independent of smoking initiation, alcoholic drinks per week, and moderate-to-vigorous physical activity levels but may be influenced by BMI.
CONCLUSION
Evidence from our study supports a potentially protective effect of high levels of retinol and albumin on OA risk.
PubMed: 38178976
DOI: 10.3389/fnut.2023.1233086 -
Food Chemistry Oct 2023In this study, 104 RIL (Recombinant Inbred Pepper Lines: F6) populations which generated by selfing Capsicum annuum (Long pepper) × Capsicum frutescens (PI281420) F6...
Characterization of phenolics and tocopherol profile, capsaicinoid composition and bioactive properties of fruits in interspecies (Capsicum annuum X Capsicum frutescens) recombinant inbred pepper lines (RIL).
In this study, 104 RIL (Recombinant Inbred Pepper Lines: F6) populations which generated by selfing Capsicum annuum (Long pepper) × Capsicum frutescens (PI281420) F6 population were characterized in terms of detailed bioactive properties, major phenolic composition, tocopherol and capsaicinoid profile. Total phenolics, flavonoid and total anthocyanin contents of the red pepper lines were in the range of 7.06-17.15 mg gallic acid equivalent (GAE)/g dw, 1.10-5.46 mg catechin equivalent (CE)/g dw and 7.9-516.6 mg/kg dw extract, respectively. Antiradical activity and antioxidant capacity values also ranged between 18.99 and 49.73% and 6.97-16.47 mg ascorbic acid equivalent (AAE)/kg dw, respectively. Capsaicin and dihydrocapsaicin levels showed a wide variance with the range of 27.9-1405.9 and 12.3-640.4 mg/100 g dw, respectively. Scoville heat unit revealed that the 95% of the peppers were highly pungent. The major tocopherol was alpha tocopherol for the pepper samples with the highest level of 1078.4 µg/g dw. The major phenolics were detected as p-coumaric acid, ferulic acid, myricetin, luteolin and quercetin. Pepper genotypes showed significant differences in terms of the characterized properties and principal component analysis was applied successfully to reveal the similar genotypes.
Topics: Capsicum; Fruit; Tocopherols; Capsaicin; Vitamin E; Antioxidants; Phenols
PubMed: 37209546
DOI: 10.1016/j.foodchem.2023.136173 -
Journal of Basic and Clinical... Jan 2024Liver diseases are complex conditions, significantly influenced by oxidative stress. This comprehensive review assesses the therapeutic role of antioxidants like... (Review)
Review
Liver diseases are complex conditions, significantly influenced by oxidative stress. This comprehensive review assesses the therapeutic role of antioxidants like l-ascorbic acid and α tocopherol, beta-carotene, various minerals, and plant-based ingredients in mitigating oxidative stress-induced liver diseases. The manuscript delves into the critical influence of genetic and epigenetic factors on disease susceptibility, progression, and response to antioxidant therapy. While animal studies suggest antioxidant efficacy in liver disease treatment, human trials remain inconclusive, and caution is advised due to its possible potential pro-oxidant effects. Moreover, the interactions of antioxidants with other drugs necessitate careful consideration in the management of polypharmacy in liver disease patients. The review underscores the need for further research to establish the clinical benefits of antioxidants with understanding of possible antioxidant toxicities to elucidate the intricate interplay of genetic, epigenetic, and environmental factors in liver diseases. The aim is to foster a better understanding of the knowledge on hepatic disease management with judicial antioxidant therapies.
Topics: Animals; Humans; Antioxidants; Ascorbic Acid; Oxidative Stress; alpha-Tocopherol; Liver Diseases
PubMed: 38234261
DOI: 10.1515/jbcpp-2023-0156 -
Journal of Veterinary Internal Medicine 2023Omega-3 fatty acid and alpha-tocopherol supplementation reduces gastric ulcer formation in humans and rodents; however, efficacy of prevention in horses is unknown....
BACKGROUND
Omega-3 fatty acid and alpha-tocopherol supplementation reduces gastric ulcer formation in humans and rodents; however, efficacy of prevention in horses is unknown. Equine Omega Complete (EOC) is an oral supplement containing omega-3 fatty acids and alpha-tocopherol.
HYPOTHESIS/OBJECTIVE
Determine if EOC supplementation prevents gastric ulcers and increases serum alpha-tocopherol concentrations in healthy horses.
ANIMALS
Nine thoroughbred geldings; 5-13 years old.
METHODS
Prospective randomized block design, repeated in crossover model. Horses were administered EOC, omeprazole, or water PO for 28 days. Horses underwent an established gastric ulcer induction protocol from days 21-28 via intermittent feed deprivation. Gastroscopies were performed on days 0, 21, and 28. Serum alpha-tocopherol concentrations were measured on days 0 and 28. The effects of treatment and time on ulcer grades were assessed with ordinal logistic regression, with significance at P-value <.05.
RESULTS
Ulcer grades increased during ulcer induction in control and EOC but not omeprazole groups (P = .02). Grades increased in EOC-treated horses after ulcer induction from a median of 1 [95% confidence interval 0-2.5] (day 0) to 2.5 [1.5-3.5] (day 28) and were similar to the control group (P = .54). Serum alpha-tocopherol increased in EOC-treated horses from day 0 to day 28 (mean 2.2 0.43 μg/mL to 2.96 0.89 μg/mL; P < .001) with high individual variation; this increase was not different from omeprazole or control groups.
CONCLUSION AND CLINICAL IMPORTANCE
Supplementation with EOC for 28 days did not prevent gastric ulcer formation nor increase alpha-tocopherol concentrations relative to the control group.
Topics: Animals; Male; alpha-Tocopherol; Cross-Over Studies; Dietary Supplements; Horse Diseases; Horses; Omeprazole; Prospective Studies; Stomach Ulcer
PubMed: 37775973
DOI: 10.1111/jvim.16877 -
Food Chemistry Nov 2023Investigation of edible oil stability involves interactions between additive polyphenols and the inherent tocopherols. The work aimed to identify endogenous polyphenols...
Investigation of edible oil stability involves interactions between additive polyphenols and the inherent tocopherols. The work aimed to identify endogenous polyphenols to produce the synergistic effect with α-tocopherol in olive oil and to find the right action ratio. Caffeic acid and quercetin were selected from the 15 main endogenous phenolic compounds in olive oil. Quercetin had the strongest synergistic effect with α-tocopherol at 2:1 in the olive oil model. The rate of 2:1 also was the turning point of the change of synergism. Furthermore, the addition of quercetin and α-tocopherol at 2:1 to olive oil resulted in lower POV, K232, K270, and secondary oxidation products such as (E, E)-2,4-decadienal and 2-pentylfuran than the olive oil model with a single antioxidant in three months of accelerated oxidation. The dynamic changes of antioxidants during oxidation in olive oil indicated that their synergistic effect was the repair and regeneration of α-tocopherol by quercetin.
Topics: Olive Oil; alpha-Tocopherol; Quercetin; Plant Oils; Antioxidants; Phenols; Polyphenols; Oxidation-Reduction
PubMed: 37364319
DOI: 10.1016/j.foodchem.2023.136667 -
Journal of Orthopaedic Research :... Apr 2024Although the Achilles tendon is the largest and strongest tendon in the body, healing of the Achilles tendon is the most common injury, and this process is difficult due...
Although the Achilles tendon is the largest and strongest tendon in the body, healing of the Achilles tendon is the most common injury, and this process is difficult due to poor tendon circulation; moreover, the underlying mechanism has not been fully elucidated. In our study, we aimed to investigate the effects of pentoxifylline and alpha-tocopherol administered separately or in combination on rats with Achilles tendon injury. Forty-eight male Wistar rats weighing 230 ± 30 g were used in the study. The rats were randomly divided into eight groups of six animals each. Tendons were evaluated histopathologically and biomechanically. According to the statistical analysis, the vascularity density in the pentoxifylline group on day 14 was significantly greater than that in the other groups (p < 0.05). The collagen arrangement in the pentoxifylline and alpha-tocopherol groups on day 14 was found to be firmer and smoother than that in the control group (p < 0.05). The collagen arrangement in the pentoxifylline group on day 28 was greater than that in the other groups (p < 0.05). The biomechanical results were significantly greater in all groups (p < 0.05). Pentoxifylline contributed to tendon healing both through neovascularization in the early period and by improving collagen orientation in the late period, while alpha-tocopherol had a positive effect on collagen orientation in the early period. No beneficial effects were observed when pentoxifylline and alpha-tocopherol were used together. We believe that further research is needed to understand the effects of this combination therapy on tendon healing.
PubMed: 38564283
DOI: 10.1002/jor.25844 -
Free Radical Biology & Medicine Aug 2024α-Tocopherol (α-T) is a vitamin, but the reasons for the α-T requirement are controversial. Given that α-T deficiency was first identified in embryos, we studied to...
α-Tocopherol (α-T) is a vitamin, but the reasons for the α-T requirement are controversial. Given that α-T deficiency was first identified in embryos, we studied to the premier model of vertebrate embryo development, the zebrafish embryo. We developed an α-T-deficient diet for zebrafish and used fish consuming this diet to produce α-T deficient (E-) embryos. We showed that α-T deficiency causes increased lipid peroxidation, leading to metabolic dysregulation that impacts both biochemical and morphological changes at very early stages in development. These changes occur at an early developmental window, which takes place prior to an analogous time to when a human knows she is pregnant. We found that α-T limits the chain reaction of lipid peroxidation and protects metabolic pathways and integrated gene expression networks that control embryonic development. Importantly, not only is α-T critical during early development, but the neurodevelopmental process is highly dependent on α-T trafficking by the α-T transfer protein (TTPa). Data from both gene expression and evaluation of the metabolome in E- embryos suggest that the activity of the mechanistic Target of Rapamycin (mTOR) signaling pathway is dysregulated-mTOR is a master regulatory mechanism, which controls both metabolism and neurodevelopment. Our findings suggest that TTPa is needed not only for regulation of plasma α-T in adults but is a key regulator during embryogenesis.
Topics: Animals; Female; Humans; alpha-Tocopherol; Carrier Proteins; Embryo, Nonmammalian; Embryonic Development; Gene Expression Regulation, Developmental; Lipid Peroxidation; Signal Transduction; TOR Serine-Threonine Kinases; Zebrafish; Zebrafish Proteins; Pregnancy
PubMed: 38754744
DOI: 10.1016/j.freeradbiomed.2024.05.028 -
Food & Function Jan 2024Anticancer effects of vitamin E (tocopherols) have been studied extensively. While and animal studies showed promising results regarding anticancer effects of...
Anticancer effects of vitamin E (tocopherols) have been studied extensively. While and animal studies showed promising results regarding anticancer effects of tocopherols, human intervention studies failed to reproduce these results. , α-tocopherol (α-TOH) is metabolized to the long-chain metabolites (LCM) 13'-hydroxychromanol (α-13'-OH) and 13'-carboxychromanol (α-13'-COOH), which likely reach the large intestine. The LCM showed antiproliferative effects in different colon cancer cell lines, but the exact mechanism of action remains unclear. To further clarify the chemopreventive action of the LCM, premalignant LT97 colon adenoma cells were treated with α-TOH, α-13'-OH and α-13'-COOH to study their impact on growth, apoptosis, antigenotoxicity, and ROS-scavenging capacity as well as expression of selected genes involved in detoxification and the cell cycle. Growth inhibitory potential was observed for α-13'-OH (IC: 37.4 μM) and α-13'-COOH (IC: 5.8 μM) but not for α-TOH in the tested concentrations. Levels of caspase-3 activity and expression of genes regulating the cell cycle and detoxification remained unchanged. However, α-TOH, α-13'-OH and α-13'-COOH exhibited antigenotoxic and partly ROS-scavenging capacity. The results indicate that the LCM exert chemopreventive effects ROS-scavenging capacity, the protection against DNA damage and the induction of cell death caspase-independent mechanisms in premalignant colon cells.
Topics: Animals; Humans; alpha-Tocopherol; Reactive Oxygen Species; Tocopherols; Colonic Neoplasms; Adenoma
PubMed: 38019686
DOI: 10.1039/d3fo02826g -
Blood Advances Dec 2023Diffuse large B-cell lymphoma (DLBCL) is the most common lymphoma in adults, but first-line immunochemotherapy fails to produce a durable response in about one-third of...
Diffuse large B-cell lymphoma (DLBCL) is the most common lymphoma in adults, but first-line immunochemotherapy fails to produce a durable response in about one-third of the patients. Because tumor cells often reprogram their metabolism, we investigated the importance of glutaminolysis, a pathway converting glutamine to generate energy and various metabolites, for the growth of DLBCL cells. Glutaminase-1 (GLS1) expression was robustly detected in DLBCL biopsy samples and cell lines. Both pharmacological inhibition and genetic knockdown of GLS1 induced cell death in DLBCL cells regardless of their subtype classification, whereas primary B cells remained unaffected. Interestingly, GLS1 inhibition resulted not only in reduced levels of intermediates of the tricarboxylic acid cycle but also in a strong mitochondrial accumulation of reactive oxygen species. Supplementation of DLBCL cells with α-ketoglutarate or with the antioxidant α-tocopherol mitigated oxidative stress and abrogated cell death upon GLS1 inhibition, indicating an essential role of glutaminolysis in the protection from oxidative stress. Furthermore, the combination of the GLS1 inhibitor CB-839 with the therapeutic BCL2 inhibitor ABT-199 not only induced massive reactive oxygen species (ROS) production but also exhibited highly synergistic cytotoxicity, suggesting that simultaneous targeting of GLS1 and BCL2 could represent a novel therapeutic strategy for patients with DLBCL.
Topics: Humans; Glutaminase; Lymphoma, Large B-Cell, Diffuse; Oxidative Stress; Proto-Oncogene Proteins c-bcl-2; Reactive Oxygen Species; Antineoplastic Agents
PubMed: 37934892
DOI: 10.1182/bloodadvances.2023010964