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Hu W, Kim JE. Differential Performance of Xanthophylls in Combination with Phenol Classes against H 2O 2-Induced Oxidative Stress: An In Vitro Analysis Using Retinal Pigment Epithelial Cells. Mol Nutr Food Res 2024; 68:e2400038. [PMID: 38824669 DOI: 10.1002/mnfr.202400038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 04/21/2024] [Indexed: 06/04/2024]
Abstract
SCOPE Xanthophylls, vital for ocular defense against blue light and reactive oxygen species, are prone to oxidative degradation; however, they may be regenerated antioxidant-rich plant phenols. Despite certain in vitro evidence, clinical studies show inconsistent findings and this may be due to varying phenolic reduction potentials. Therefore, the current study aims to investigate the ocular protective effect of various plant phenols combined with xanthophyll. METHODS AND RESULTS Human retinal pigment epithelial cells (ARPE-19) are subjected to oxidative stress induced by hydrogen peroxide (H2O2) after xanthophyll and phenol pretreatment. Assessments include xanthophyll uptake, total antioxidant capacity, cell viability, intracellular reactive oxygen species levels, apoptosis, phagocytosis, and vascular endothelial growth factor formation. The study finds that while the combination of lutein with phenols does not show significant protective effects compared to lutein-only, zeaxanthin combined with phenols exhibits enhanced protection compared to both the zeaxanthin-only and control groups. CONCLUSION The research reveals the complex relationship between xanthophylls and phenols, suggesting that the advantageous effects of their combination might vary among different xanthophylls. Caution is necessary when applying molecular theories to ocular health, and this necessitates further research, serving as a basis for proposing clinical trials to evaluate the efficacy of specific xanthophyll and phenol combinations.
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Affiliation(s)
- Weili Hu
- Department of Food Science and Technology, National University of Singapore, Singapore, 117543, Singapore
| | - Jung Eun Kim
- Department of Food Science and Technology, National University of Singapore, Singapore, 117543, Singapore
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Zhu Z, Xu Y, Guo Y, Liu R, Chang M, Wang X. Antioxidant interaction between α-tocopherol and γ-oryzanol in HepG2 cells. Food Funct 2024; 15:992-1003. [PMID: 38179649 DOI: 10.1039/d3fo03727d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Minor constituents exhibit certain antioxidant interactions in vitro, and the effects in different media are different. However, it is not clear whether there are antioxidant interactions in cells after digestion and absorption. We utilized the cellular antioxidant evaluation model in HepG2 cells to study the antioxidant interaction between α-tocopherol and γ-oryzanol, and the interaction mechanism of a binary mixture was also illustrated. A cellular antioxidant assay (CAA) model and a combined index (CI) method were firstly used to explore the antioxidant activity and interaction of the binary mixture in HepG2 cells. The CAA value was positively correlated with the single addition concentration, while the results displayed a biphasic tendency with increasing concentrations of the binary mixture. The combination of TO11 (1 μg mL-1 α-tocopherol and 10 μg mL-1 γ-oryzanol) showed the greatest antioxidant activity and synergistic effect, and the maximum CAA value reached up to 94.84 ± 4.2. Then the mechanism of the synergistic antioxidant effect of the binary mixture was explained from three aspects including cellular uptake, intracellular reactive oxygen species (ROS) level and endogenous enzyme activity. The results demonstrated that the antioxidant interaction of the binary mixture in cells was related to cellular uptake of minor constituents, and the combination of TO11 exerted a synergistic effect by scavenging ROS and up-regulating glutathione peroxidase (GSH-Px) activity, resulting in the strongest cellular antioxidant activity. This study throws light on the nature of antioxidant interaction between minor constituents, which may contribute to the development of related functional foods and rational dietary collocation.
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Affiliation(s)
- Zhu Zhu
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Lipid Nutrition and Safety, School of Food Science and Technology, Jiangnan, University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China.
| | - Ying Xu
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Lipid Nutrition and Safety, School of Food Science and Technology, Jiangnan, University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China.
| | - Yiwen Guo
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Lipid Nutrition and Safety, School of Food Science and Technology, Jiangnan, University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China.
| | - Ruijie Liu
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Lipid Nutrition and Safety, School of Food Science and Technology, Jiangnan, University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China.
| | - Ming Chang
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Lipid Nutrition and Safety, School of Food Science and Technology, Jiangnan, University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China.
| | - Xingguo Wang
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Lipid Nutrition and Safety, School of Food Science and Technology, Jiangnan, University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China.
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Hu W, Zheng R, Feng Y, Tan D, Chan Chung-Tsing G, Su X, Kim JE. Impacts of regular consumption of grapes on macular pigment accumulation in Singapore older adults: a randomized controlled trial. Food Funct 2023; 14:8321-8330. [PMID: 37605542 DOI: 10.1039/d3fo02105j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
Background: Oxidative stress is a key risk factor for visual impairment and consuming dietary antioxidant-rich foods may help in managing visual impairments. However, a limited number of studies have investigated the effect of dietary antioxidant-rich food including grapes on eye health in older adults. Objectives: To assess the effects on macular pigment accumulation of regular consumption of grapes in Singapore older adults. Methods: This was a 16 week, double-blind, randomized, placebo-controlled trial. Thirty-four Singapore older adults were randomized into regularly consuming either 46 g day-1 of freeze-dried table grape powder (the intervention group) or the same amount of placebo powder (the control group). Macular pigment optical density (MPOD), skin carotenoid status, advanced glycation end product (AGEs) status and dietary lutein intake were assessed every 4 weeks, and plasma lutein concentration, total antioxidant capacity and total phenolic content were measured every 8 weeks. Results: A significant time effect (p = 0.007) was observed for MPOD, and this is largely attributed to the improvement in the MPOD for the intervention group, as a significant increase was observed only in this group (week 0: 0.56 ± 0.04 D.U.; week 16: 0.61 ± 0.04 D.U., p < 0.01). Additionally, a significant increase in plasma total antioxidant capacity (week 0: 0.26 ± 0.13 mM TEAC; week 16: 0.36 ± 0.20 mM TEAC, p < 0.01) and total phenolic content (week 0: 10.50 ± 0.44 mg L-1 GAE; week 16: 12.58 ± 0.55 mg L-1 GAE, p < 0.001) was observed for the intervention group only. In contrast, a significant increase in skin AGE status was observed in the control group (week 0: 2.47 ± 0.24; week 16: 2.99 ± 0.12, p < 0.05) while this was mitigated in the intervention group. There were no differences in dietary lutein intake, plasma lutein concentration and skin carotenoid status between groups throughout the study. Conclusions: Regular intake of grapes may improve eye health in Singapore older adults, specifically in augmenting MPOD, which can be explained by an increase in plasma total antioxidant capacity and phenolic content, and the downregulation of AGEs. This study was registered at clinicatrials.gov as NCT05064865.
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Affiliation(s)
- Weili Hu
- Department of Food Science and Technology, National University of Singapore, Singapore 117543, Singapore.
| | - Ruoxi Zheng
- Department of Food Science and Technology, National University of Singapore, Singapore 117543, Singapore.
| | - Yuting Feng
- Department of Food Science and Technology, National University of Singapore, Singapore 117543, Singapore.
| | - Denise Tan
- Department of Food Science and Technology, National University of Singapore, Singapore 117543, Singapore.
- Science and Technology Department, Nestlé R&D Center (Pte) Ltd, Singapore 618802, Singapore
| | - Gregory Chan Chung-Tsing
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore 117549, Singapore
| | - Xinyi Su
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119074, Singapore
| | - Jung Eun Kim
- Department of Food Science and Technology, National University of Singapore, Singapore 117543, Singapore.
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Petersen JM, Naimi AI, Bodnar LM. Does heterogeneity underlie differences in treatment effects estimated from SuperLearner versus logistic regression? An application in nutritional epidemiology. Ann Epidemiol 2023; 83:30-34. [PMID: 37121376 PMCID: PMC10330341 DOI: 10.1016/j.annepidem.2023.04.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 04/02/2023] [Accepted: 04/24/2023] [Indexed: 05/02/2023]
Abstract
PURPOSE A strength of SuperLearner is that it may accommodate key interactions between model variables without a priori specification. In prior research, protective associations between fruit intake and preeclampsia were stronger when estimated using SuperLearner with targeted maximum likelihood estimation (TMLE) compared with multivariable logistic regression without any interaction terms. We explored whether heterogeneity (i.e., differences in the effect estimate due to interactions between fruit intake and covariates) may partly explain differences in estimates from these two models. METHODS Using a U.S. prospective pregnancy cohort (2010-2013, n = 7781), we estimated preeclampsia risk differences (RDs) for higher versus lower fruit density using multivariable logistic regression and included two-way statistical interactions between fruit density and each of the 25 model covariates. We compared the RDs with those from SuperLearner with TMLE (gold standard) and logistic regression with no interaction. RESULTS From the logistic regression models with two-way statistical interactions, 48% of the preeclampsia RDs were ≤-0.02 (closer to SuperLearner with TMLE estimate); 40% equaled -0.01 (same as logistic regression with no interaction estimate); the minority of RDs were at or crossed the null. CONCLUSIONS Our exploratory analysis provided preliminary evidence that heterogeneity may partly explain differences in estimates from logistic regression versus SuperLearner with TMLE.
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Affiliation(s)
- Julie M Petersen
- Department of Epidemiology, University of Pittsburgh School of Public Health, Pittsburgh, PA
| | - Ashley I Naimi
- Epidemiology Department, Emory University, Rollins School of Public Health, Atlanta, GA
| | - Lisa M Bodnar
- Department of Epidemiology, University of Pittsburgh School of Public Health, Pittsburgh, PA; Department of Obstetrics, Gynecology, and Reproductive Sciences, School of Medicine, University of Pittsburgh, Pittsburgh, PA.
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Hong W, Lou B, Gao Y, Zhao H, Ying S, Yang S, Li H, Yang Q, Yang G. Tumor microenvironment responded naturally extracted F OF1-ATPase loaded chromatophores for antitumor therapy. Int J Biol Macromol 2023; 230:123127. [PMID: 36603722 DOI: 10.1016/j.ijbiomac.2022.123127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 12/29/2022] [Accepted: 12/30/2022] [Indexed: 01/04/2023]
Abstract
Tumor microenvironment (TME) plays an important role in the growth, invasion, and metastasis of tumor cells. The pH of TME is more acidic in solid tumors than in normal tissues. Although targeted delivery in TME has progressed, the complex and expensive construction of delivery systems has limited their application. FOF1-ATP synthase (FOF1-ATPase) is a rotation molecular motor found in bacteria, chloroplasts, and mitochondria. Here, FOF1-ATPase loaded chromatophores (chroma) isolated from thermophilic bacteria were extracted and utilized as a new delivery system targeting TME for the first time. Curcumin as model drug was successfully loaded by a filming-rehydration ultrasonic dispersion method to prepare a curcumin-loaded chroma delivery system (Cur-Chroma). The mobility and propensity distributions of Cur-Chroma reveal its specific pH-sensitive targeting driven by the transmembrane proton kinetic potential, demonstrating its distinct distribution in the TME and more favorable targeting delivery. Cellular uptake experiments indicated that Cur-Chroma entered cells through grid pathway-mediated endocytosis. In vivo studies have shown that Cur-Chroma can specifically target tumor tissue and effectively inhibit tumor growth with good safety. Curcumin's bioavailability and anti-tumor effects were significantly improved. These studies demonstrate that ATPase-loaded chromatophores are potentially ideal vehicles for anti-tumor drug delivery and have promising applications.
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Affiliation(s)
- Weiyong Hong
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China; Department of Pharmacy, Municipal Hospital Affiliated to Taizhou University, Taizhou 318000, China
| | - Bang Lou
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China
| | - Ying Gao
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China; Zhejiang Moda Biotech Co., Ltd, Hangzhou 310018, China
| | - Hui Zhao
- Department of Intensive Care Unit, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou 318050, China
| | - Sanjun Ying
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China
| | - Saicheng Yang
- Department of Pharmacy, Municipal Hospital Affiliated to Taizhou University, Taizhou 318000, China
| | - Hanbing Li
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China
| | - Qingliang Yang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China
| | - Gensheng Yang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China.
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Chen X, Yu J, Zheng L, Deng Z, Li H. Quercetin and lycopene co-administration prevents oxidative damage induced by d-galactose in mice. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.102042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Chen X, Zheng L, Zhang B, Deng Z, Li H. Synergistic protection of quercetin and lycopene against oxidative stress via SIRT1-Nox4-ROS axis in HUVEC cells. Curr Res Food Sci 2022; 5:1985-1993. [PMID: 36304485 PMCID: PMC9593281 DOI: 10.1016/j.crfs.2022.10.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 09/26/2022] [Accepted: 10/14/2022] [Indexed: 11/19/2022] Open
Abstract
Oxidative stress is a potential factor in the promotion of endothelial dysfunction. In this research, flavonoids (quercetin, luteolin) combined with carotenoids (lycopene, lutein), especially quercetin-lycopene combination (molar ratio 5:1), prevented the oxidative stress in HUVEC cells by reducing the reactive oxygen species (ROS) and suppressing the expression of NADPH oxidase 4 (Nox4), a major source of ROS production. RNA-seq analysis indicated quercetin-lycopene combination downregulated inflammatory genes induced by H2O2, such as IL-17 and NF-κB. The expression of NF-κB p65 was activated by H2O2 but inhibited by the quercetin-lycopene combination. Moreover, the quercetin and lycopene combination promoted the thermostability of Sirtuin 1 (SIRT1) and activated SIRT1 deacetyl activity. SIRT1 inhibitor EX-527 attenuated the inhibitory effects of quercetin, lycopene, and their combination on the expression of p65, Nox4 enzyme, and ROS. Quercetin-lycopene combination could interact with SIRT1 to inhibit Nox4 and prevent endothelial oxidative stress, potentially contributing to the prevention of cardiovascular disease.
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Affiliation(s)
- Xuan Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, Jiangxi, China
| | - Liufeng Zheng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, Jiangxi, China
| | - Bing Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, Jiangxi, China
| | - Zeyuan Deng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, Jiangxi, China
- Institute for Advanced Study, Nanchang University, Nanchang, 330031, Jiangxi, China
- Corresponding author. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, Jiangxi, China.
| | - Hongyan Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, Jiangxi, China
- Corresponding author.
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