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Therapeutic Effects of Green Tea Polyphenol (‒)-Epigallocatechin-3-Gallate (EGCG) in Relation to Molecular Pathways Controlling Inflammation, Oxidative Stress, and Apoptosis. Int J Mol Sci 2022; 24:ijms24010340. [PMID: 36613784 PMCID: PMC9820274 DOI: 10.3390/ijms24010340] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/20/2022] [Accepted: 12/22/2022] [Indexed: 12/28/2022] Open
Abstract
(‒)-Epigallocatechin-3-gallate (EGCG) is the most abundant polyphenol in green tea. Thanks to multiple interactions with cell surface receptors, intracellular signaling pathways, and nuclear transcription factors, EGCG possesses a wide variety of anti-inflammatory, antioxidant, antifibrotic, anti-remodelation, and tissue-protective properties which may be useful in the treatment of various diseases, particularly in cancer, and neurological, cardiovascular, respiratory, and metabolic disorders. This article reviews current information on the biological effects of EGCG in the above-mentioned disorders in relation to molecular pathways controlling inflammation, oxidative stress, and cell apoptosis.
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Li S, Yan J, Zhu Q, Liu X, Li S, Wang S, Wang X, Sheng J. Biological Effects of EGCG@MOF Zn(BTC)4 System Improves Wound Healing in Diabetes. Molecules 2022; 27:molecules27175427. [PMID: 36080195 PMCID: PMC9458255 DOI: 10.3390/molecules27175427] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/10/2022] [Accepted: 08/12/2022] [Indexed: 11/21/2022] Open
Abstract
Tea contains high levels of the compound epigallocatechin gallate (EGCG). It is considered an important functional component in tea and has anti-cancer, antioxidant, and anti-inflammatory effects. The eight phenolic hydroxyl groups in EGCG’s chemical structure are the basis for EGCG’s multiple biological effects. At the same time, it also leads to poor chemical stability, rendering EGCG prone to oxidation and isomerization reactions that change its original structure and biological activity. Learning how to maintain the activity of EGCG has become an important goal in understanding the biological activity of EGCG and the research and development of tea-related products. Metal–organic frameworks (MOFs) are porous materials with a three-dimensional network structure that are composed of inorganic metals or metal clusters together with organic complexes. MOFs exploit the porous nature of the material itself. When a drug is an appropriate size, it can be wrapped into the pores by physical or chemical methods; this allows the drug to be released slowly, and MOFs can also reduce drug toxicity. In this study, we used MOF Zn(BTC)4 materials to load EGCG and investigated the sustained release effect of EGCG@MOF Zn(BTC)4 and the biological effects on wound healing in a diabetic mouse model.
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Affiliation(s)
- Song Li
- College of Science, Yunnan Agricultural University, Kunming 650201, China
- Correspondence: (S.L.); (X.W.); (J.S.)
| | - Jing Yan
- Key Laborotory of Puer Tea Sciencs, Ministry of Education(YNAU), Yunnan Agricultural University, Kunming 650201, China
- Agro-Products Processing Research Institute, Yunnan Academy of Agricultural Sciences, Kunming 650201, China
| | - Qiangqiang Zhu
- Key Laborotory of Puer Tea Sciencs, Ministry of Education(YNAU), Yunnan Agricultural University, Kunming 650201, China
| | - Xinxiang Liu
- Key Laborotory of Puer Tea Sciencs, Ministry of Education(YNAU), Yunnan Agricultural University, Kunming 650201, China
| | - Senlin Li
- College of Science, Yunnan Agricultural University, Kunming 650201, China
| | - Shenhou Wang
- College of Science, Yunnan Agricultural University, Kunming 650201, China
| | - Xuanjun Wang
- College of Science, Yunnan Agricultural University, Kunming 650201, China
- Key Laborotory of Puer Tea Sciencs, Ministry of Education(YNAU), Yunnan Agricultural University, Kunming 650201, China
- Correspondence: (S.L.); (X.W.); (J.S.)
| | - Jun Sheng
- Key Laborotory of Puer Tea Sciencs, Ministry of Education(YNAU), Yunnan Agricultural University, Kunming 650201, China
- Correspondence: (S.L.); (X.W.); (J.S.)
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Opichka MA, Rappelt MW, Gutterman DD, Grobe JL, McIntosh JJ. Vascular Dysfunction in Preeclampsia. Cells 2021; 10:3055. [PMID: 34831277 PMCID: PMC8616535 DOI: 10.3390/cells10113055] [Citation(s) in RCA: 78] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 11/01/2021] [Accepted: 11/04/2021] [Indexed: 01/22/2023] Open
Abstract
Preeclampsia is a life-threatening pregnancy-associated cardiovascular disorder characterized by hypertension and proteinuria at 20 weeks of gestation. Though its exact underlying cause is not precisely defined and likely heterogenous, a plethora of research indicates that in some women with preeclampsia, both maternal and placental vascular dysfunction plays a role in the pathogenesis and can persist into the postpartum period. Potential abnormalities include impaired placentation, incomplete spiral artery remodeling, and endothelial damage, which are further propagated by immune factors, mitochondrial stress, and an imbalance of pro- and antiangiogenic substances. While the field has progressed, current gaps in knowledge include detailed initial molecular mechanisms and effective treatment options. Newfound evidence indicates that vasopressin is an early mediator and biomarker of the disorder, and promising future therapeutic avenues include mitigating mitochondrial dysfunction, excess oxidative stress, and the resulting inflammatory state. In this review, we provide a detailed overview of vascular defects present during preeclampsia and connect well-established notions to newer discoveries at the molecular, cellular, and whole-organism levels.
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Affiliation(s)
- Megan A. Opichka
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA; (M.A.O.); (D.D.G.); (J.L.G.)
| | - Matthew W. Rappelt
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA;
| | - David D. Gutterman
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA; (M.A.O.); (D.D.G.); (J.L.G.)
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA;
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Justin L. Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA; (M.A.O.); (D.D.G.); (J.L.G.)
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA;
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI 53226, USA
- Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Jennifer J. McIntosh
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA; (M.A.O.); (D.D.G.); (J.L.G.)
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA;
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Chen Y, Zhang H, Fan W, Mats L, Liu R, Deng Z, Tsao R. Anti-Inflammatory Effect and Cellular Transport Mechanism of Phenolics from Common Bean ( Phaseolus vulga L.) Milk and Yogurts in Caco-2 Mono- and Caco-2/EA.hy926 Co-Culture Models. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:1513-1523. [PMID: 33497227 DOI: 10.1021/acs.jafc.0c06934] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The bioavailability and anti-inflammatory activity of the phenolic compounds derived from gastrointestinal digestates of navy bean and light red kidney bean milks and yogurts were investigated in both Caco-2 mono- and Caco-2/EA.hy926 co-culture cell models. Instead of being transported directly, the ferulic acid ester derivatives in common bean milks and yogurts were found to be metabolized into ferulic acid and then be transported through the Caco-2 cell monolayer with an average basolateral ferulic acid concentration of 56 ± 3 ng/mL after 2 h. Strong anti-inflammatory effects were observed in the basolateral EA.hy926 cells of the co-culture model, and modulations of oxLDL-induced inflammatory mediators by the transported phenolics were verified to be through the p38 MAPK pathway. The present results suggest that the common bean-derived phenolics can be metabolized and absorbed by the intestinal epithelial cells and have antioxidant and anti-inflammatory effects against oxidative stress injury in vascular endothelial cells, hence contributing to the amelioration of vascular diseases.
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Affiliation(s)
- Yuhuan Chen
- State Key Laboratory of Food Science and Technology, University of Nanchang, Nanchang 330047, Jiangxi, China
- Agriculture and Agri-Food Canada, Guelph Research & Development Centre, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
- Department of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, Jiangxi, China
| | - Hua Zhang
- Agriculture and Agri-Food Canada, Guelph Research & Development Centre, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
- Department of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, Jiangxi, China
| | - Wenyi Fan
- Department of Animal Bioscience, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Lili Mats
- Agriculture and Agri-Food Canada, Guelph Research & Development Centre, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
| | - Ronghua Liu
- Agriculture and Agri-Food Canada, Guelph Research & Development Centre, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
| | - Zeyuan Deng
- State Key Laboratory of Food Science and Technology, University of Nanchang, Nanchang 330047, Jiangxi, China
| | - Rong Tsao
- Agriculture and Agri-Food Canada, Guelph Research & Development Centre, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
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Siwapornchai N, Lee JN, Tchalla EYI, Bhalla M, Yeoh JH, Roggensack SE, Leong JM, Bou Ghanem EN. Extracellular adenosine enhances the ability of PMNs to kill Streptococcus pneumoniae by inhibiting IL-10 production. J Leukoc Biol 2020; 108:867-882. [PMID: 32017200 DOI: 10.1002/jlb.4ma0120-115rr] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 01/14/2020] [Accepted: 01/17/2020] [Indexed: 12/18/2022] Open
Abstract
Polymorphonuclear leukocytes (PMNs) are crucial for initial control of Streptococcus pneumoniae (pneumococcus) lung infection; however, as the infection progresses their persistence in the lungs becomes detrimental. Here we explored why the antimicrobial efficacy of PMNs declines over the course of infection. We found that the progressive inability of PMNs to control infection correlated with phenotypic differences characterized by a decrease in CD73 expression, an enzyme required for production of extracellular adenosine (EAD). EAD production by CD73 was crucial for the ability of both murine and human PMNs to kill S. pneumoniae. In exploring the mechanisms by which CD73 controlled PMN function, we found that CD73 mediated its antimicrobial activity by inhibiting IL-10 production. PMNs from wild-type mice did not increase IL-10 production in response to S. pneumoniae; however, CD73-/- PMNs up-regulated IL-10 production upon pneumococcal infection in vitro and during lung challenge. IL-10 inhibited the ability of WT PMNs to kill pneumococci. Conversely, blocking IL-10 boosted the bactericidal activity of CD73-/- PMNs as well as host resistance of CD73-/- mice to pneumococcal pneumonia. CD73/IL-10 did not affect apoptosis, bacterial uptake, and intracellular killing or production of antimicrobial neutrophil elastase and myeloperoxidase. Rather, inhibition of IL-10 production by CD73 was important for optimal reactive oxygen species (ROS) production by PMNs. ROS contributed to PMN antimicrobial function as their removal or detoxification impaired the ability of PMNs to efficiently kill S. pneumoniae. This study demonstrates that CD73 controls PMN antimicrobial phenotype during S. pneumoniae infection.
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Affiliation(s)
- Nalat Siwapornchai
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - James N Lee
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Essi Y I Tchalla
- Department of Microbiology and Immunology, University at Buffalo School of Medicine, Buffalo, New York, USA
| | - Manmeet Bhalla
- Department of Microbiology and Immunology, University at Buffalo School of Medicine, Buffalo, New York, USA
| | - Jun Hui Yeoh
- Department of Microbiology and Immunology, University at Buffalo School of Medicine, Buffalo, New York, USA
| | - Sara E Roggensack
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - John M Leong
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Elsa N Bou Ghanem
- Department of Microbiology and Immunology, University at Buffalo School of Medicine, Buffalo, New York, USA
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Cimmino G, Cirillo P, Conte S, Pellegrino G, Barra G, Maresca L, Morello A, Calì G, Loffredo F, De Palma R, Arena G, Sawamura T, Ambrosio G, Golino P. Oxidized low-density lipoproteins induce tissue factor expression in T-lymphocytes via activation of lectin-like oxidized low-density lipoprotein receptor-1. Cardiovasc Res 2019; 116:1125-1135. [DOI: 10.1093/cvr/cvz230] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 07/17/2019] [Accepted: 08/21/2019] [Indexed: 12/11/2022] Open
Abstract
Abstract
Aims
T-lymphocytes plays an important role in the pathophysiology of acute coronary syndromes. T-cell activation in vitro by pro-inflammatory cytokines may lead to functional tissue factor (TF) expression, indicating a possible contribution of immunity to thrombosis. Oxidized low-density lipoproteins (oxLDLs) are found abundantly in atherosclerotic plaques. We aimed at evaluating the effects of oxLDLs on TF expression in T cells and the role of the lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1).
Methods and results
CD3+ cells were isolated from healthy volunteers. Gene, protein, and surface expression of TF, as well as of LOX-1, were assessed at different time-points after oxLDL stimulation. To determine whether oxLDL-induced TF was LOX-1 dependent, T cells were pre-incubated with an LOX-1 inhibiting peptide (L-RBP) or with an anti-LOX-1 blocking antibody. To exclude that TF expression was mediated by reactive oxygen species (ROS) generation, oxLDL-stimulated T cells were pre-incubated with superoxide dismutase + catalase or with 4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (Tempol), an intracellular free radical scavenger. Finally, to determine if the observed findings in vitro may have a biological relevance, the presence of CD3+/TF+/LOX-1+ cells was evaluated by immunofluorescence in human carotid atherosclerotic lesions. oxLDLs induced functionally active TF expression in T cells in a dose- and time-dependent manner, independently on ROS generation. No effect was observed in native LDL-treated T cells. LOX-1 expression was also induced by oxLDLs in a time- and dose-dependent manner. Pre-incubation with L-RBP or anti-LOX-1 antibody almost completely inhibited oxLDL-mediated TF expression. Interestingly, human carotid plaques showed significant infiltration of CD3+ cells (mainly CD8+ cells), some of which were positive for both TF and LOX-1.
Conclusion
oxLDLs induce functional TF expression in T-lymphocytes in vitro via interaction of oxLDLs with LOX-1. Human carotid atherosclerotic plaques contain CD3+/CD8+cells that express both TF and LOX-1, indicating that also in patients these mechanisms may play an important role.
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Affiliation(s)
- Giovanni Cimmino
- Department of Translational Medical Sciences, Section of Cardiology, University of Campania “Luigi Vanvitelli”, c/o Monaldi Hospital, Via L. Bianchi, 1, 80131 Naples, Italy
| | - Plinio Cirillo
- Department of Advanced Biomedical Sciences, Section of Cardiology, University of Naples “Federico II”, Naples, Italy
| | - Stefano Conte
- Department of Translational Medical Sciences, Section of Cardiology, University of Campania “Luigi Vanvitelli”, c/o Monaldi Hospital, Via L. Bianchi, 1, 80131 Naples, Italy
| | - Grazia Pellegrino
- Department of Advanced Biomedical Sciences, Section of Cardiology, University of Naples “Federico II”, Naples, Italy
| | - Giusi Barra
- Department of Clinical and Experimental Medicine, Section of Clinical Immunology, University of Campania “Luigi Vanvitelli”, Naples, Italy
| | - Lucio Maresca
- Vascular Surgery Unit, Monaldi Hospital, Naples, Italy
| | - Andrea Morello
- Department of Advanced Biomedical Sciences, Section of Cardiology, University of Naples “Federico II”, Naples, Italy
| | - Gaetano Calì
- Endocrinology and Experimental Oncology Institute, CNR, Naples, Italy
| | - Francesco Loffredo
- Department of Translational Medical Sciences, Section of Cardiology, University of Campania “Luigi Vanvitelli”, c/o Monaldi Hospital, Via L. Bianchi, 1, 80131 Naples, Italy
- Molecular Cardiology, International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
| | - Raffaele De Palma
- Department of Clinical and Experimental Medicine, Section of Clinical Immunology, University of Campania “Luigi Vanvitelli”, Naples, Italy
- Institute of Protein Biochemistry, CNR, Naples, Italy
| | - Giulia Arena
- Department of Translational Medical Sciences, Section of Cardiology, University of Campania “Luigi Vanvitelli”, c/o Monaldi Hospital, Via L. Bianchi, 1, 80131 Naples, Italy
| | - Tatsuya Sawamura
- Department of Physiology, Shinshu University School of Medicine, Asahi, Japan
| | | | - Paolo Golino
- Department of Translational Medical Sciences, Section of Cardiology, University of Campania “Luigi Vanvitelli”, c/o Monaldi Hospital, Via L. Bianchi, 1, 80131 Naples, Italy
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Matic A, Jukic I, Stupin A, Baric L, Mihaljevic Z, Unfirer S, Tartaro Bujak I, Mihaljevic B, Lombard JH, Drenjancevic I. High salt intake shifts the mechanisms of flow-induced dilation in the middle cerebral arteries of Sprague-Dawley rats. Am J Physiol Heart Circ Physiol 2018; 315:H718-H730. [DOI: 10.1152/ajpheart.00097.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The goal of the present study was to examine the effect of 1 wk of high salt (HS) intake and the role of oxidative stress in changing the mechanisms of flow-induced dilation (FID) in isolated pressurized middle cerebral arteries of male Sprague-Dawley rats ( n = 15–16 rats/group). Reduced FID in the HS group was restored by intake of the superoxide scavenger tempol (HS + tempol in vivo group). The nitric oxide (NO) synthase inhibitor Nω-nitro-l-arginine methyl ester, cyclooxygenase inhibitor indomethacin, and selective inhibitor of microsomal cytochrome P-450 epoxidase activity N-(methylsulfonyl)-2-(2-propynyloxy)-benzenehexanamide significantly reduced FID in the low salt diet-fed group, whereas FID in the HS group was mediated by NO only. Cyclooxygenase-2 mRNA (but not protein) expression was decreased in the HS and HS + tempol in vivo groups. Hypoxia-inducible factor-1α and VEGF protein levels were increased in the HS group but decreased in the HS + tempol in vivo group. Assessment by direct fluorescence of middle cerebral arteries under flow revealed significantly reduced vascular NO levels and increased superoxide/reactive oxygen species levels in the HS group. These results suggest that HS intake impairs FID and changes FID mechanisms to entirely NO dependent, in contrast to the low-salt diet-fed group, where FID is NO, prostanoid, and epoxyeicosatrienoic acid dependent. These changes were accompanied by increased lipid peroxidation products in the plasma of HS diet-fed rats, increased vascular superoxide/reactive oxygen species levels, and decreased NO levels, together with increased expression of hypoxia-inducible factor-1α and VEGF. NEW & NOTEWORTHY High-salt (HS) diet changes the mechanisms of flow-induced dilation in rat middle cerebral arteries from a combination of nitric oxide-, prostanoid-, and epoxyeicosatrienoic acid-dependent mechanisms to, albeit reduced, a solely nitric oxide-dependent dilation. In vivo reactive oxygen species scavenging restores flow-induced dilation in HS diet-fed rats and ameliorates HS-induced increases in the transcription factor hypoxia-inducible factor-1α and expression of its downstream target genes.
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Affiliation(s)
- Anita Matic
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
| | - Ivana Jukic
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
| | - Ana Stupin
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
| | - Lidija Baric
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
| | - Zrinka Mihaljevic
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
| | - Sanela Unfirer
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
| | - Ivana Tartaro Bujak
- Radiation Chemistry and Dosimetry Laboratory, Division of Materials Chemistry, Ruđer Bošković Institute, Zagreb, Croatia
| | - Branka Mihaljevic
- Radiation Chemistry and Dosimetry Laboratory, Division of Materials Chemistry, Ruđer Bošković Institute, Zagreb, Croatia
| | - Julian H. Lombard
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Ines Drenjancevic
- Department of Physiology and Immunology, Faculty of Medicine Osijek, Josip Juraj Strossmayer of Osijek, Osijek, Croatia
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Bonucci J, Gragnani A, Trincado MM, Vincentin V, Correa SAA, Ferreira LM. The role of vitamin C in the gene expression of oxidative stress markers in fibroblasts from burn patients. Acta Cir Bras 2018; 33:703-712. [DOI: 10.1590/s0102-865020180080000006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Accepted: 07/23/2018] [Indexed: 12/31/2022] Open
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Du X, Yu J, Sun X, Qu S, Zhang H, Hu M, Yang S, Zhou P. Impact of epigallocatechin‑3‑gallate on expression of nuclear factor erythroid 2‑related factor 2 and γ‑glutamyl cysteine synthetase genes in oxidative stress‑induced mouse renal tubular epithelial cells. Mol Med Rep 2018; 17:7952-7958. [PMID: 29620178 DOI: 10.3892/mmr.2018.8798] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 03/23/2017] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to investigate the antioxidant response mechanism of epigallocatechin‑3‑gallate (EGCG) in H2O2‑induced mouse renal tubular epithelial cells (MRTECs). The cultured MRTECs were divided into normal, H2O2 (control) and EGCG treatment groups. The MTT assay was used to assess cell viability, and reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR), immunocytochemical and western blot analyses were performed to detect the expression of nuclear factor erythroid 2‑related factor 2 (Nrf2) and γ‑glutamyl cysteine synthetase (γ‑GCS). EGCG was able to mitigate H2O2‑mediated cell damage. The RT‑qPCR results demonstrated that EGCG was able to upregulate the gene expression of Nrf2 and γ‑GCS in MRTECs in a dose‑dependent manner. The immunocytochemistry and western blot analyses demonstrated that EGCG was able to increase the protein expression of Nrf2 and γ‑GCS in MRTECs in a dose‑dependent manner. Oxidative stress may lead to a decrease in the viability of MRTECs, while EGCG was able to promote the expression of Nrf2 and γ‑GCS in MRTECs, thereby improving the antioxidant capacity of the cells and promoting the repair of oxidative stress injury.
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Affiliation(s)
- Xuanyi Du
- Department of Nephrology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Jinfeng Yu
- Department of Pediatrics, Hongqi Hospital of Mudanjiang Medical College, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Xiaohan Sun
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Shaochuan Qu
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Haitao Zhang
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Mengying Hu
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Shufen Yang
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Ping Zhou
- Department of Pediatrics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
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10
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Walker C, Biasucci LM. Cardiovascular safety of non-steroidal anti-inflammatory drugs revisited. Postgrad Med 2017; 130:55-71. [DOI: 10.1080/00325481.2018.1412799] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Chris Walker
- Global Product Director, Pfizer, Walton Oaks, UK
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11
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Green Tea Extracts Epigallocatechin-3-gallate for Different Treatments. BIOMED RESEARCH INTERNATIONAL 2017; 2017:5615647. [PMID: 28884125 PMCID: PMC5572593 DOI: 10.1155/2017/5615647] [Citation(s) in RCA: 170] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 06/28/2017] [Indexed: 02/05/2023]
Abstract
Epigallocatechin-3-gallate (EGCG), a component extracted from green tea, has been proved to have multiple effects on human pathological and physiological processes, and its mechanisms are discrepant in cancer, vascularity, bone regeneration, and nervous system. Although there are multiple benefits associated with EGCG, more and more challenges are still needed to get through. For example, EGCG shows low bioactivity via oral administration. This review focuses on effects of EGCG, including anti-cancer, antioxidant, anti-inflammatory, anticollagenase, and antifibrosis effects, to express the potential of EGCG and necessity of further studies in this field.
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12
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Siti HN, Kamisah Y, Nur Iliyani MI, Mohamed S, Jaarin K. Citrus leaf extract reduces blood pressure and vascular damage in repeatedly heated palm oil diet-Induced hypertensive rats. Biomed Pharmacother 2017; 87:451-460. [DOI: 10.1016/j.biopha.2016.12.075] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/15/2016] [Accepted: 12/19/2016] [Indexed: 11/28/2022] Open
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13
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Santiago E, Martínez MP, Climent B, Muñoz M, Briones AM, Salaices M, García-Sacristán A, Rivera L, Prieto D. Augmented oxidative stress and preserved vasoconstriction induced by hydrogen peroxide in coronary arteries in obesity: role of COX-2. Br J Pharmacol 2016; 173:3176-3195. [PMID: 27535007 DOI: 10.1111/bph.13579] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 08/02/2016] [Accepted: 08/03/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND AND PURPOSE Oxidative stress plays a key role in the vascular and metabolic abnormalities associated with obesity. Herein, we assessed whether obesity can increase coronary vasoconstriction induced by hydrogen peroxide (H2 O2 ) and the signalling pathways involving COX-2 and superoxide (O2.- ) generation. EXPERIMENTAL APPROACH Contractile responses to H2 O2 and O2.- generation were measured in coronary arteries from genetically obese Zucker rats (OZR) and compared to lean Zucker rats (LZR). KEY RESULTS Both basal and H2 O2 -stimulated O2.- production were enhanced in coronary arteries from OZR, but H2 O2 -induced vasoconstriction was unchanged. The selective COX-2 inhibitor NS398 significantly reduced H2 O2 -induced contractions in endothelium-denuded arteries from LZR and OZR, but only in endothelium-intact arteries from LZR. PGI2 (IP) receptor antagonism modestly reduced the vasoconstrictor action of H2 O2 while antagonism of the PGE2 receptor 4 (EP4 ) enhanced H2 O2 contractions in arteries from OZR but not LZR. Basal release of COX-2-derived PGE2 was higher in coronary arteries from OZR where the selective agonist of EP4 receptors TCS 2519 evoked potent relaxations. COX-2 was up-regulated after acute exposure to H2 O2 in coronary endothelium and vascular smooth muscle (VSM) and inhibition of COX-2 markedly reduced H2 O2 -elicited O2.- generation in coronary arteries and myocardium. Expression of Nox subunits in VSM and NADPH-stimulated O2.- generation was enhanced and contributed to H2 O2 vasoconstriction in arteries from obese rats. CONCLUSION AND IMPLICATIONS COX-2 contributes to cardiac oxidative stress and to the endothelium-independent O2.- -mediated coronary vasoconstriction induced by H2 O2 in obesity, which is offset by the release of COX-2-derived endothelial PGE2 acting on EP4 vasodilator receptors.
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Affiliation(s)
- Elvira Santiago
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain
| | - Maria Pilar Martínez
- Departamento de Anatomía and Anatomía Patológica Comparadas, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Belén Climent
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain
| | - Mercedes Muñoz
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain
| | - Ana María Briones
- Departamento de Farmacología, Facultad de Medicina, Instituto de Investigación Hospital Universitario La Paz (IdiPAZ), Universidad Autónoma de Madrid, Madrid, Spain
| | - Mercedes Salaices
- Departamento de Farmacología, Facultad de Medicina, Instituto de Investigación Hospital Universitario La Paz (IdiPAZ), Universidad Autónoma de Madrid, Madrid, Spain
| | - Albino García-Sacristán
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain
| | - Luis Rivera
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain
| | - Dolores Prieto
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain.
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14
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Fleckenstein-Elsen M, Dinnies D, Jelenik T, Roden M, Romacho T, Eckel J. Eicosapentaenoic acid and arachidonic acid differentially regulate adipogenesis, acquisition of a brite phenotype and mitochondrial function in primary human adipocytes. Mol Nutr Food Res 2016; 60:2065-75. [PMID: 27159788 DOI: 10.1002/mnfr.201500892] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 03/07/2016] [Accepted: 04/03/2016] [Indexed: 01/21/2023]
Abstract
SCOPE n-3 and n-6 PUFAs have several opposing biological effects and influence white adipose tissue (WAT) function. The recent discovery of thermogenic UCP1-expressing brite adipocytes within WAT raised the question whether n-3 and n-6 PUFAs exert differential effects on brite adipocyte formation and mitochondrial function. METHODS AND RESULTS Primary human preadipocytes were treated with n-3 PUFAs (eicosapentaenoic acid, EPA; docosahexaenoic acid, DHA) or n-6 PUFA (arachidonic acid, ARA) during differentiation, and adipogenesis, white and brite gene expression markers, mitochondrial content and function were analyzed at day 12 of differentiation. Adipogenesis was equally increased by n-3 and n-6 PUFAs. The n-6 PUFA ARA increased lipid droplet size and expression of the white-specific marker TCF21 while decreased mitochondrial protein expression and respiratory function. In contrast, EPA increased expression of the brown adipocyte-related genes UCP1 and CPT1B, and improved mitochondrial function of adipocytes. The opposing effects of EPA and ARA on gene expression and mitochondrial function were also observed in cells treated from day 8 to 12 of adipocyte differentiation. CONCLUSION EPA promotes brite adipogenesis and improves parameters of mitochondrial function, such as increased expression of CPTB1, citrate synthase activity and higher maximal respiratory capacity, while ARA reduced mitochondrial spare respiratory capacity in vitro.
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Affiliation(s)
- Manuela Fleckenstein-Elsen
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, Germany
| | - Daniela Dinnies
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, Germany
| | - Tomas Jelenik
- German Center for Diabetes Research, Partner Düsseldorf, Germany.,Institute for Clinical Diabetology, German Diabetes Center, Düsseldorf, Germany
| | - Michael Roden
- German Center for Diabetes Research, Partner Düsseldorf, Germany.,Institute for Clinical Diabetology, German Diabetes Center, Düsseldorf, Germany.,Department of Endocrinology and Diabetology, Medical Faculty, Heinrich-Heine University Düsseldorf, Germany
| | - Tania Romacho
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Düsseldorf, Germany.,German Center for Diabetes Research, Partner Düsseldorf, Germany
| | - Jürgen Eckel
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Düsseldorf, Germany. .,German Center for Diabetes Research, Partner Düsseldorf, Germany.
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15
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Mostafa T, Rashed L, Taymour M. Seminal cyclooxygenase relationship with oxidative stress in infertile oligoasthenoteratozoospermic men with varicocele. Andrologia 2016; 48:137-42. [PMID: 25906828 DOI: 10.1111/and.12423] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/24/2015] [Indexed: 02/05/2023] Open
Abstract
This study aimed to assess the relation of seminal cyclooxygenase COX-1, COX-2 with oxidative stress in infertile oligoasthenoteratozoospermic (OAT) men with varicocele (Vx). In all, 128 men were allocated into fertile men, fertile men with Vx, infertile OAT men without Vx and infertile OAT men with Vx. They were subjected to history taking, clinical examination and semen analysis. Also, seminal COX-1, COX-2, malondialdehyde (MDA) and glutathione peroxidase (GPx) were estimated. Mean levels of seminal COX-1, COX-2 were over-expressed, the mean level of seminal MDA was significantly increased, and the mean level of seminal GPx was significantly decreased in infertile OAT men with Vx compared with other groups. Seminal COX-1 and COX-2 were over-expressed in cases with Vx grade III compared with Vx grades I, II cases and in cases with bilateral Vx compared with unilateral Vx. There was significant negative correlation between seminal COX-1 and COX-2 with sperm concentration, sperm motility, sperm normal morphology, seminal GPx and significant positive correlation with seminal MDA. It is concluded that seminal COX-1 and COX-2 are over-expressed in infertile OAT men with Vx compared with fertile men with/without and infertile OAT men without Vx being associated with oxidative stress, Vx grade and Vx laterality.
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Affiliation(s)
- T Mostafa
- Andrology and Sexology Department, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - L Rashed
- Medical Biochemistry Department, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - M Taymour
- Dermatology and Andrology Department, Egypt Air Hospital, Cairo, Egypt
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16
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Toniolo A, Buccellati C, Trenti A, Trevisi L, Carnevali S, Sala A, Bolego C. Antiinflammatory and antioxidant effects of H2O2 generated by natural sources in Il1β-treated human endothelial cells. Prostaglandins Other Lipid Mediat 2015; 121:190-8. [PMID: 26391839 DOI: 10.1016/j.prostaglandins.2015.09.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 08/07/2015] [Accepted: 09/16/2015] [Indexed: 10/23/2022]
Abstract
Specific reactive oxygen species (ROS) from different sources, might lead to different and even opposite, cellular effects. We studied the production of specific ROS resulting from the exposure of human umbilical veins endothelial cells (HUVEC) to H2O2 derived from the natural antioxidant epigallocathechin gallate (EGCG) or from the exposure to IL-1β using a fluorogenic probe and flow cytometry, and evaluated by western blot analysis and immunocytochemistry the associated expression of transcription factors sensitive to both inflammatory and oxidative stress, such as NF-κB and Nrf2, and some downstream activated genes such as cyclooxygenase-2 (COX-2) and hemeoxygenase 1 (HO-1). The results obtained showed that exogenously-generated H2O2 induce anti-inflammatory and antioxidant effects in HUVECs counteracting the pro-inflammatory and pro-oxidant effect of IL-1β related to the production of superoxide anions. The underlying mechanisms resulting from the extracellular production of H2O2, include (1) Nrf2 nuclear translocation and the enhanced expression of antioxidant enzymes such as HO-1, and (2) the previously unreported inhibition of NF-κB and COX-2 expression. Overall, these findings provide evidence that the production of specific reactive oxygen species finely tunes endothelial cell function and might be relevant for the reappraisal of the effects of exogenous antioxidants in the context of cardiovascular diseases.
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Affiliation(s)
- Alice Toniolo
- Department of Pharmaceuticaland Pharmacological Sciences, University of Padova, Italy
| | - Carola Buccellati
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | - Annalisa Trenti
- Department of Pharmaceuticaland Pharmacological Sciences, University of Padova, Italy
| | - Lucia Trevisi
- Department of Pharmaceuticaland Pharmacological Sciences, University of Padova, Italy
| | - Silvia Carnevali
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | - Angelo Sala
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy; Institute of Biomedicine and Molecular Immunology, National Research Council, Palermo, Italy.
| | - Chiara Bolego
- Department of Pharmaceuticaland Pharmacological Sciences, University of Padova, Italy
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17
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Abdel-Gaber SA, Ibrahim MA, Amin EF, Ibrahim SA, Mohammed RK, Abdelrahman AM. Effect of selective versus non-selective cyclooxygenase inhibitors on ischemia–reperfusion-induced hepatic injury in rats. Life Sci 2015; 134:42-8. [DOI: 10.1016/j.lfs.2015.04.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 04/22/2015] [Accepted: 04/25/2015] [Indexed: 12/18/2022]
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18
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Siti HN, Kamisah Y, Kamsiah J. The role of oxidative stress, antioxidants and vascular inflammation in cardiovascular disease (a review). Vascul Pharmacol 2015; 71:40-56. [PMID: 25869516 DOI: 10.1016/j.vph.2015.03.005] [Citation(s) in RCA: 586] [Impact Index Per Article: 65.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 02/28/2015] [Accepted: 03/09/2015] [Indexed: 12/31/2022]
Abstract
The concept of mild chronic vascular inflammation as part of the pathophysiology of cardiovascular disease, most importantly hypertension and atherosclerosis, has been well accepted. Indeed there are links between vascular inflammation, endothelial dysfunction and oxidative stress. However, there are still gaps in our understanding regarding this matter that might be the cause behind disappointing results of antioxidant therapy for cardiovascular risk factors in large-scale long-term randomised controlled trials. Apart from the limitations of our knowledge, limitations in methodology and assessment of the body's endogenous and exogenous oxidant-antioxidant status are a serious handicap. The pleiotropic effects of antioxidant and anti-inflammation that are shown by some well-established antihypertensive agents and statins partly support the idea of using antioxidants in vascular diseases as still relevant. This review aims to provide an overview of the links between oxidative stress, vascular inflammation, endothelial dysfunction and cardiovascular risk factors, importantly focusing on blood pressure regulation and atherosclerosis. In view of the potential benefits of antioxidants, this review will also examine the proposed role of vitamin C, vitamin E and polyphenols in cardiovascular diseases as well as the success or failure of antioxidant therapy for cardiovascular diseases in clinical trials.
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Affiliation(s)
- Hawa N Siti
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia; Department of Basic Medical Sciences, Faculty of Medicine, Universiti Sultan Zainal Abidin, Terengganu, Malaysia
| | - Y Kamisah
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - J Kamsiah
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia.
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19
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Roles of lipid-modulating enzymes diacylglycerol kinase and cyclooxygenase under pathophysiological conditions. Anat Sci Int 2014; 90:22-32. [PMID: 25471593 DOI: 10.1007/s12565-014-0265-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Accepted: 11/17/2014] [Indexed: 10/24/2022]
Abstract
Lipid not only represents a constituent of the plasma membrane, but also plays a pivotal role in intracellular signaling. Lipid-mediated signaling system is strictly regulated by several enzymes, which act at various steps of the lipid metabolism. Under pathological conditions, prolonged or insufficient activation of this system results in dysregulated signaling, leading to diseases such as cancer or metabolic syndrome. Of the lipid-modulating enzymes, diacylglycerol kinase (DGK) and cyclooxygenase (COX) are intimately involved in the signaling system. DGK consists of a family of enzymes that phosphorylate a second messenger diacylglycerol (DG) to produce phosphatidic acid (PA). Both DG and PA are known to activate signaling molecules such as protein kinase C. COX catalyzes the committed step in prostanoid biosynthesis, which involves the metabolism of arachidonic acid to produce prostaglandins. Previous studies have shown that the DGK and COX are engaged in a number of pathological conditions. This review summarizes the functional implications of these two enzymes in ischemia, liver regeneration, vascular events, diabetes, cancer and inflammation.
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20
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Reprint of “Heated vegetable oils and cardiovascular disease risk factors”. Vascul Pharmacol 2014; 62:38-46. [DOI: 10.1016/j.vph.2014.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 02/08/2014] [Accepted: 02/15/2014] [Indexed: 01/31/2023]
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21
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Ng CY, Leong XF, Masbah N, Adam SK, Kamisah Y, Jaarin K. Heated vegetable oils and cardiovascular disease risk factors. Vascul Pharmacol 2014; 61:1-9. [PMID: 24632108 DOI: 10.1016/j.vph.2014.02.004] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 02/08/2014] [Accepted: 02/15/2014] [Indexed: 11/19/2022]
Abstract
Cardiovascular disease (CVD) is one of the leading major causes of morbidity and mortality worldwide. It may result from the interactions between multiple genetic and environmental factors including sedentary lifestyle and dietary habits. The quality of dietary oils and fats has been widely recognised to be inextricably linked to the pathogenesis of CVD. Vegetable oil is one of the essential dietary components in daily food consumption. However, the benefits of vegetable oil can be deteriorated by repeated heating that leads to lipid oxidation. The practice of using repeatedly heated cooking oil is not uncommon as it will reduce the cost of food preparation. Thermal oxidation yields new functional groups which may be potentially hazardous to cardiovascular health. Prolonged consumption of the repeatedly heated oil has been shown to increase blood pressure and total cholesterol, cause vascular inflammation as well as vascular changes which predispose to atherosclerosis. The harmful effect of heated oils is attributed to products generated from lipid oxidation during heating process. In view of the potential hazard of oxidation products, therefore this review article will provide an insight and awareness to the general public on the consumption of repeatedly heated oils which is detrimental to health.
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Affiliation(s)
- Chun-Yi Ng
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Xin-Fang Leong
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia; Department of Clinical Oral Biology, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Norliana Masbah
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Siti Khadijah Adam
- Department of Human Anatomy, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Yusof Kamisah
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Kamsiah Jaarin
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia.
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22
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Gould ST, Matherly EE, Smith JN, Heistad DD, Anseth KS. The role of valvular endothelial cell paracrine signaling and matrix elasticity on valvular interstitial cell activation. Biomaterials 2014; 35:3596-606. [PMID: 24462357 DOI: 10.1016/j.biomaterials.2014.01.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 01/07/2014] [Indexed: 12/23/2022]
Abstract
The effects of valvular endothelial cell (VlvEC) paracrine signaling on VIC phenotype and nodule formation were tested using a co-culture platform with physiologically relevant matrix elasticities and diffusion distance. 100 μm thin poly(ethylene glycol) (PEG) hydrogels of 3-27 kPa Young's moduli were fabricated in transwell inserts. VICs were cultured on the gels, as VIC phenotype is known to change significantly within this range, while VlvECs lined the underside of the membrane. Co-culture with VlvECs significantly reduced VIC activation to the myofibroblast phenotype on all gels with the largest percent decrease on the 3 kPa gels (~70%), while stiffer gels resulted in approximately 20-30% decrease. Additionally, VlvECs significantly reduced αSMA protein expression (~2 fold lower) on both 3 and 27 kPa gels, as well as the number (~2 fold lower) of nodules formed on the 27 kPa gels. Effects of VlvECs were prevented when nitric oxide (NO) release was inhibited with l-NAME, suggesting that VlvEC produced NO inhibits VIC activation. Withdrawal of l-NAME after 3, 5, and 7 days with restoration of VlvEC NO production for 2 additional days led to a partial reversal of VIC activation (~25% decrease). A potential mechanism by which VlvEC produced NO reduced VIC activation was studied by inhibiting initial and mid-stage cGMP pathway molecules. Inhibition of soluble guanylyl cyclase (sGC) with ODQ or protein kinase G (PKG) with RBrcGMP or stimulation of Rho kinase (ROCK) with LPA, abolished VlvEC effects on VIC activation. This work contributes substantially to the understanding of the valve endothelium's role in preventing VIC functions associated with aortic valve stenosis initiation and progression.
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Affiliation(s)
- Sarah T Gould
- Department of Chemical and Biological Engineering, The BioFrontiers Institute, Boulder, CO 80303, USA
| | - Emily E Matherly
- Department of Chemical and Biological Engineering, The BioFrontiers Institute, Boulder, CO 80303, USA
| | - Jennifer N Smith
- Department of Chemical and Biological Engineering, The BioFrontiers Institute, Boulder, CO 80303, USA
| | - Donald D Heistad
- Departments of Internal Medicine and Pharmacology, University of Iowa Health Care, Iowa City, IA 52242, USA
| | - Kristi S Anseth
- Department of Chemical and Biological Engineering, The BioFrontiers Institute, Boulder, CO 80303, USA; Howard Hughes Medical Institute University of Colorado, Boulder, CO 80303, USA.
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23
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New insights into the mechanisms of polyphenols beyond antioxidant properties; lessons from the green tea polyphenol, epigallocatechin 3-gallate. Redox Biol 2014; 2:187-95. [PMID: 24494192 PMCID: PMC3909779 DOI: 10.1016/j.redox.2013.12.022] [Citation(s) in RCA: 506] [Impact Index Per Article: 50.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 12/20/2013] [Accepted: 12/20/2013] [Indexed: 12/16/2022] Open
Abstract
Green tea is rich in polyphenol flavonoids including catechins. Epigallocatechin 3-gallate (EGCG) is the most abundant and potent green tea catechin. EGCG has been extensively studied for its beneficial health effects as a nutriceutical agent. Based upon its chemical structure, EGCG is often classified as an antioxidant. However, treatment of cells with EGCG results in production of hydrogen peroxide and hydroxyl radicals in the presence of Fe (III). Thus, EGCG functions as a pro-oxidant in some cellular contexts. Recent investigations have revealed many other direct actions of EGCG that are independent from anti-oxidative mechanisms. In this review, we discuss these novel molecular mechanisms of action for EGCG. In particular, EGCG directly interacts with proteins and phospholipids in the plasma membrane and regulates signal transduction pathways, transcription factors, DNA methylation, mitochondrial function, and autophagy to exert many of its beneficial biological actions. Many biological actions of EGCG are mediated by specific mechanisms other than its well-known anti-oxidant properties. EGCG is a pro-oxidant per se in some biological contexts. EGCG directly interacts with cell surface membrane proteins and specific known receptors. Treatment of cells with EGCG regulates specific intracellular signaling pathways and transcription. Specific biological actions of EGCG are regulated in a concentration-dependent manner.
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Hošek J, Toniolo A, Neuwirth O, Bolego C. Prenylated and geranylated flavonoids increase production of reactive oxygen species in mouse macrophages but inhibit the inflammatory response. JOURNAL OF NATURAL PRODUCTS 2013; 76:1586-91. [PMID: 23947936 DOI: 10.1021/np400242e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
In this study, four prenylated and geranylated flavonoids, cudraflavone B (1), pomiferin (2), osajin (3), and diplacone (4), were tested for their antioxidant and anti-inflammatory effects and to identify any potential relationships between chemical structure and antioxidant or anti-inflammatory properties. The selected flavonoids were examined in cell-free models to prove their ability to scavenge superoxide radicals, hydrogen peroxide, and hypochlorous acid. Further, the ability of the flavonoids to influence the formation of reactive oxygen species in the murine macrophage cell line J774.A1 was tested in the presence and absence of lipopolysaccharide (LPS). The ability of flavonoids to inhibit LPS-induced IκB-α degradation and COX-2 expression was used as a model for the inflammatory response. The present results indicated that the antioxidant activity was dependent on the chemical structure, where the catechol moiety is especially crucial for this effect. The most potent antioxidant activities in cell-free models were observed for diplacone (4), whereas cudraflavone B (1) and osajin (3) showed a pro-oxidant effect in J774.A1 cells. All flavonoids tested were able to inhibit IκB-α degradation, but only diplacone (4) also down-regulated COX-2 expression.
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Affiliation(s)
- Jan Hošek
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno , Palackého tř. 1/3, CZ 612 42, Brno, Czech Republic
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