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Liu X, Zhang X, Zhao L, Long J, Feng Z, Su J, Gao F, Liu J. Mitochondria as a sensor, a central hub and a biological clock in psychological stress-accelerated aging. Ageing Res Rev 2024; 93:102145. [PMID: 38030089 DOI: 10.1016/j.arr.2023.102145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/19/2023] [Accepted: 11/23/2023] [Indexed: 12/01/2023]
Abstract
The theory that oxidative damage caused by mitochondrial free radicals leads to aging has brought mitochondria into the forefront of aging research. Psychological stress that encompasses many different experiences and exposures across the lifespan has been identified as a catalyst for accelerated aging. Mitochondria, known for their dynamic nature and adaptability, function as a highly sensitive stress sensor and central hub in the process of accelerated aging. In this review, we explore how mitochondria as sensors respond to psychological stress and contribute to the molecular processes in accelerated aging by viewing mitochondria as hormonal, mechanosensitive and immune suborganelles. This understanding of the key role played by mitochondria and their close association with accelerated aging helps us to distinguish normal aging from accelerated aging, correct misconceptions in aging studies, and develop strategies such as exercise and mitochondria-targeted nutrients and drugs for slowing down accelerated aging, and also hold promise for prevention and treatment of age-related diseases.
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Affiliation(s)
- Xuyun Liu
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Xing Zhang
- Key Laboratory of Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an 710032, China.
| | - Lin Zhao
- Cardiometabolic Innovation Center, Ministry of Education, Department of Cardiology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China.
| | - Jiangang Long
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Zhihui Feng
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Jiacan Su
- Department of Orthopedics, Xinhua Hospital Affiliated to Shanghai JiaoTong University School of Medicine, Shanghai 200092, China; National Center for Translational Medicine (Shanghai) SHU Branch, Shanghai University, Shanghai 200444, China.
| | - Feng Gao
- Key Laboratory of Ministry of Education, School of Aerospace Medicine, Fourth Military Medical University, Xi'an 710032, China.
| | - Jiankang Liu
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China; School of Health and Life Sciences, University of Health and Rehabilitation Sciences, Qingdao 266071, China.
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2
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Rondanelli M, Gasparri C, Riva A, Petrangolini G, Barrile GC, Cavioni A, Razza C, Tartara A, Perna S. Diet and ideal food pyramid to prevent or support the treatment of diabetic retinopathy, age-related macular degeneration, and cataracts. Front Med (Lausanne) 2023; 10:1168560. [PMID: 37324128 PMCID: PMC10265999 DOI: 10.3389/fmed.2023.1168560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/09/2023] [Indexed: 06/17/2023] Open
Abstract
Many eye diseases, such as diabetic retinopathy (DR), age-related macular degeneration (AMD), and cataracts are preventable and treatable with lifestyle. The objective of this review is to assess the most recent research on the ideal dietary approach to prevent or support the treatment of DR, AMD, and cataracts, as well as to construct a food pyramid that makes it simple for people who are at risk of developing these pathologies to decide what to eat. The food pyramid presented here proposes what should be consumed every day: 3 portions of low glycemic index (GI) grains (for fiber and zinc content), 5 portions (each portion: ≥200 g/day) of fruits and vegetables (spinach, broccoli, zucchini cooked, green leafy vegetables, orange, kiwi, grapefruit for folic acid, vitamin C, and lutein/zeaxanthin content, at least ≥42 μg/day, are to be preferred), extra virgin olive (EVO) oil (almost 20 mg/day for vitamin E and polyphenols content), nuts or oil seeds (20-30 g/day, for zinc content, at least ≥15.8 mg/day); weekly: fish (4 portions, for omega-3 content and eicosapentaenoic acid (EPA) + docosahexaenoic acid (DHA) 0.35-1.4 g/day), white meat (3 portions for vitamin B12 content), legumes (2 portions for vegetal proteins), eggs (2 portions for lutein/zeaxanthin content), light cheeses (2 portions for vitamin B6 content), and almost 3-4 times/week microgreen and spices (saffron and curcumin). At the top of the pyramid, there are two pennants: one green, which indicates the need for personalized supplementation (if daily requirements cannot be met through diet, omega-3, and L-methylfolate supplementation), and one red, which indicates that certain foods are prohibited (salt and sugar). Finally, 3-4 times per week, 30-40 min of aerobic and resistance exercises are required.
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Affiliation(s)
- Mariangela Rondanelli
- Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Mondino Foundation, Pavia, Italy
- Unit of Human and Clinical Nutrition, Department of Public Health, Experimental and Forensic Medicine, University of Pavia, Pavia, Italy
| | - Clara Gasparri
- Endocrinology and Nutrition Unit, Azienda di Servizi alla Persona “Istituto Santa Margherita”, University of Pavia, Pavia, Italy
| | | | | | - Gaetan Claude Barrile
- Endocrinology and Nutrition Unit, Azienda di Servizi alla Persona “Istituto Santa Margherita”, University of Pavia, Pavia, Italy
| | - Alessandro Cavioni
- Endocrinology and Nutrition Unit, Azienda di Servizi alla Persona “Istituto Santa Margherita”, University of Pavia, Pavia, Italy
| | - Claudia Razza
- Endocrinology and Nutrition Unit, Azienda di Servizi alla Persona “Istituto Santa Margherita”, University of Pavia, Pavia, Italy
| | - Alice Tartara
- Endocrinology and Nutrition Unit, Azienda di Servizi alla Persona “Istituto Santa Margherita”, University of Pavia, Pavia, Italy
| | - Simone Perna
- Department of Biology, College of Science, University of Bahrain, Zallaq, Bahrain
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3
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Effect of Different Coffee Brews on Tryptophan Metabolite-Induced Cytotoxicity in HT-29 Human Colon Cancer Cells. Antioxidants (Basel) 2022; 11:antiox11122458. [PMID: 36552667 PMCID: PMC9774627 DOI: 10.3390/antiox11122458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/15/2022] Open
Abstract
Coffee consumption positively influences colon health. Conversely, high levels of tryptophan metabolites such as skatole released from intestinal putrefactive fermentation in the presence of excessive dietary animal protein intake, and gut microbiota alterations, may have several adverse effects, including the development of colorectal cancer. Therefore, this study aimed to elucidate the potential protective effects of coffee in the presence of different skatole levels. The results showed that skatole exposure induced reduced cell viability and oxidative stress in the HT-29 human colon cancer cell line. However, co-treatment of cells with skatole and coffee samples was able to reduce ROS production (up to 45% for espresso) compared to cells not treated with coffee. Real-time PCR analysis highlighted that treating HT-29 cells with skatole increased the levels of inflammatory cytokines and chemokines TNF-α, IL-1β, IL-8, and IL12, whereas exposure to coffee extracts in cells that were pretreated with skatole showed anti-inflammatory effects with decreased levels of these cytokines. These findings demonstrate that coffee may counteract the adverse effects of putrefactive compounds by modulating oxidative stress and exerting anti-inflammatory activity in colonocytes, thus suggesting that coffee intake could improve health conditions in the presence of altered intestinal microbiota metabolism.
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Xie E, Nadeem U, Xie B, D’Souza M, Sulakhe D, Skondra D. Using Computational Drug-Gene Analysis to Identify Novel Therapeutic Candidates for Retinal Neuroprotection. Int J Mol Sci 2022; 23:ijms232012648. [PMID: 36293505 PMCID: PMC9604082 DOI: 10.3390/ijms232012648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/11/2022] [Accepted: 10/18/2022] [Indexed: 01/24/2023] Open
Abstract
Retinal cell death is responsible for irreversible vision loss in many retinal disorders. No commercially approved treatments are currently available to attenuate retinal cell loss and preserve vision. We seek to identify chemicals/drugs with thoroughly-studied biological functions that possess neuroprotective effects in the retina using a computational bioinformatics approach. We queried the National Center for Biotechnology Information (NCBI) to identify genes associated with retinal neuroprotection. Enrichment analysis was performed using ToppGene to identify compounds related to the identified genes. This analysis constructs a Pharmacome from multiple drug-gene interaction databases to predict compounds with statistically significant associations to genes involved in retinal neuroprotection. Compounds with known deleterious effects (e.g., asbestos, ethanol) or with no clinical indications (e.g., paraquat, ozone) were manually filtered. We identified numerous drug/chemical classes associated to multiple genes implicated in retinal neuroprotection using a systematic computational approach. Anti-diabetics, lipid-lowering medicines, and antioxidants are among the treatments anticipated by this analysis, and many of these drugs could be readily repurposed for retinal neuroprotection. Our technique serves as an unbiased tool that can be utilized in the future to lead focused preclinical and clinical investigations for complex processes such as neuroprotection, as well as a wide range of other ocular pathologies.
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Affiliation(s)
- Edward Xie
- Chicago Medical School at Rosalind, Franklin University of Medicine and Science, Chicago, IL 60064, USA
| | - Urooba Nadeem
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA
| | - Bingqing Xie
- Department of Medicine, University of Chicago, Chicago, IL 60637, USA
| | - Mark D’Souza
- Duchossois Family Institute, University of Chicago, Chicago, IL 60637, USA
| | - Dinanath Sulakhe
- Duchossois Family Institute, University of Chicago, Chicago, IL 60637, USA
| | - Dimitra Skondra
- Department of Ophthalmology and Visual Science, University of Chicago, Chicago, IL 60637, USA
- Correspondence:
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Khalique A, Mohammed AK, Al-khadran NM, Gharaibeh MA, Abu-Gharbieh E, El-Huneidi W, Sulaiman N, Taneera J. Reduced Retinoic Acid Receptor Beta (Rarβ) Affects Pancreatic β-Cell Physiology. BIOLOGY 2022; 11:biology11071072. [PMID: 36101450 PMCID: PMC9312298 DOI: 10.3390/biology11071072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/15/2022] [Accepted: 07/15/2022] [Indexed: 12/02/2022]
Abstract
Various studies have suggested a link between vitamin A (VA), all-trans-retinol, and type 2 diabetes (T2D). However, the functional role/expression of vitamin A receptors (Rarα, β, and γ) in pancreatic β-cells is not clear yet. Accordingly, we performed a series of bioinformatics, molecular and functional experiments in human islet and INS-1 cells to evaluate the role of Rarβ on insulin secretion and pancreatic β-cell function. Microarray and RNA-sequencing (RAN-seq) expression analysis showed that RARα, β, and γ are expressed in human pancreatic islets. RNA-seq expression of RARβ in diabetic/hyperglycemic human islets (HbA1c ≥ 6.3%) revealed a significant reduction (p = 0.004) compared to nondiabetic/normoglycemic cells (HbA1c < 6%). The expression of RARβ with INS and PDX1 showed inverse association, while positive correlations were observed with INSR and HbA1c levels. Exploration of the T2D knowledge portal (T2DKP) revealed that several genetic variants in RARβ are associated with BMI. The most associated variant is rs6804842 (p = 1.2 × 10−25). Silencing of Rarβ in INS-1 cells impaired insulin secretion without affecting cell viability or apoptosis. Interestingly, reactive oxygen species (ROS) production levels were elevated and glucose uptake was reduced in Rarβ-silenced cells. mRNA expression of Ins1, Pdx1, NeuroD1, Mafa, Snap25, Vamp2, and Gck were significantly (p < 0.05) downregulated in Rarβ-silenced cells. For protein levels, Pro/Insulin, PDX1, GLUT2, GCK, pAKT/AKT, and INSR expression were downregulated considerably (p < 0.05). The expression of NEUROD and VAMP2 were not affected. In conclusion, our results indicate that Rarβ is an important molecule for β-cell function. Hence, our data further support the potential role of VA receptors in the development of T2D.
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Affiliation(s)
- Anila Khalique
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates; (A.K.); (A.K.M.); (M.A.G.); (E.A.-G.); (W.E.-H.)
| | - Abdul Khader Mohammed
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates; (A.K.); (A.K.M.); (M.A.G.); (E.A.-G.); (W.E.-H.)
| | - Nujood Mohammed Al-khadran
- Department of Basic Medical Sciences, College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates;
| | - Mutaz Al Gharaibeh
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates; (A.K.); (A.K.M.); (M.A.G.); (E.A.-G.); (W.E.-H.)
| | - Eman Abu-Gharbieh
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates; (A.K.); (A.K.M.); (M.A.G.); (E.A.-G.); (W.E.-H.)
- Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Waseem El-Huneidi
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates; (A.K.); (A.K.M.); (M.A.G.); (E.A.-G.); (W.E.-H.)
- Department of Basic Medical Sciences, College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates;
| | - Nabil Sulaiman
- Department of Family Medicine, College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates;
| | - Jalal Taneera
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates; (A.K.); (A.K.M.); (M.A.G.); (E.A.-G.); (W.E.-H.)
- Department of Basic Medical Sciences, College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates;
- Correspondence: ; Tel.: +97-165-057-743
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Maxwell CJ, Soltisz AM, Rich WW, Choi A, Reilly MA, Swindle-Reilly KE. Tunable alginate hydrogels as injectable drug delivery vehicles for optic neuropathy. J Biomed Mater Res A 2022; 110:1621-1635. [PMID: 35607724 PMCID: PMC9543600 DOI: 10.1002/jbm.a.37412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 02/08/2022] [Accepted: 05/06/2022] [Indexed: 11/08/2022]
Abstract
Many disease pathologies, particularly in the eye, are induced by oxidative stress. In particular, injury to the optic nerve (ON), or optic neuropathy, is one of the most common causes of vision loss. Traumatic optic neuropathy (TON) occurs when the ON is damaged following blunt or penetrating trauma to either the head or eye. Currently, there is no effective treatment for TON, only management options, namely the systematic delivery of corticosteroids and surgical decompression of the optic nerve. Unfortunately, neither option alleviates the generation of reactive oxygen species (ROS) which are responsible for downstream damage to the ON. Additionally, the systemic delivery of corticosteroids can cause fatal off‐target effects in cases with brain involvement. In this study, we developed a tunable injectable hydrogel delivery system for local methylene blue (MB) delivery using an internal method of crosslinking. MB was chosen due to its ROS scavenging ability and neuroprotective properties. Our MB‐loaded polymeric scaffold demonstrated prolonged release of MB as well as in situ gel formation. Additionally, following rheological characterization, these alginate hydrogels demonstrated minimal cytotoxicity to human retinal pigment epithelial cells in vitro and exhibited injection feasibility through small‐gauge needles. Our chosen MB concentrations displayed a high degree of ROS scavenging following release from the alginate hydrogels, suggesting this approach may be successful in reducing ROS levels following ON injury, or could be applied to other ocular injuries.
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Affiliation(s)
- Courtney J Maxwell
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Andrew M Soltisz
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Wade W Rich
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Andrew Choi
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Matthew A Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Katelyn E Swindle-Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA.,Department of Ophthalmology and Visual Sciences, The Ohio State University, Columbus, Ohio, USA
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7
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Sun M, Chen X, Yang Z. Single cell mass spectrometry studies reveal metabolomic features and potential mechanisms of drug-resistant cancer cell lines. Anal Chim Acta 2022; 1206:339761. [PMID: 35473873 PMCID: PMC9046687 DOI: 10.1016/j.aca.2022.339761] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 03/18/2022] [Accepted: 03/22/2022] [Indexed: 12/28/2022]
Abstract
Irinotecan (Iri) is a key drug to treat metastatic colorectal cancer, but its clinical activity is often limited by de novo and acquired drug resistance. Studying the underlying mechanisms of drug resistance is necessary for developing novel therapeutic strategies. In this study, we used both regular and irinotecan-resistant (Iri-resistant) colorectal cell lines as models, and performed single cell mass spectrometry (SCMS) metabolomics studies combined with analyses from cytotoxicity assay, western blot, flow cytometry, quantitative real-time polymerase chain reaction (qPCR), and reactive oxygen species (ROS). Our SCMS results indicate that Iri-resistant cancer cells possess higher levels of unsaturated lipids compared with the regular cancer cells. In addition, multiple protein biomarkers and their corresponding mRNAs of colon cancer stem cells are overexpressed in Iri-resistance cells. Particularly, stearoyl-CoA desaturase 1 (SCD1) is upregulated with the development of drug resistance in Iri-resistant cells, whereas inhibiting the activity of SCD1 efficiently increase their sensitivity to Iri treatment. In addition, we demonstrated that SCD1 directly regulates the expression of ALDH1A1, which contributes to the cancer stemness and ROS level in Iri-resistant cell lines.
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Antioxidant and Anti-Inflammatory Activity of Coffee Brew Evaluated after Simulated Gastrointestinal Digestion. Nutrients 2021; 13:nu13124368. [PMID: 34959920 PMCID: PMC8705407 DOI: 10.3390/nu13124368] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/26/2021] [Accepted: 12/03/2021] [Indexed: 12/11/2022] Open
Abstract
Coffee contains human health-related molecules, namely polyphenols that possess a wide range of pharmacological functions, and their intake is associated with reduced colon cancer risk. This study aimed to assess the changes in the anti-inflammatory and antioxidant activity of coffee after simulated gastrointestinal digestion. The evaluation of intracellular reactive oxygen species (ROS) levels in the HT-29 human colon cancer cell line and three in vitro spectrophotometric assays were performed to determine the antioxidant activity of the samples. Characterization of coffee composition was also assessed through a Q-Orbitrap high-resolution mass spectrometry analysis. The results highlighted that the levels of polyphenols in the digested coffee brews were higher than those of the non-digested ones. All assayed samples decreased the levels of intracellular ROS when compared to untreated cells, while digested coffee samples exhibited higher antioxidant capacity and total phenolic content than not-digested coffee samples. Digested coffee samples showed a higher reduction in interleukin-6 levels than the not-digested samples in lipopolysaccharide-stimulated HT-29 cells treated for 48 h and fewer cytotoxic effects in the MTT assay. Overall, our findings suggest that coffee may exert antioxidant and anti-inflammatory properties, and the digestion process may be able to release compounds with higher bioactivity.
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Wiczew D, Szulc N, Tarek M. Molecular dynamics simulations of the effects of lipid oxidation on the permeability of cell membranes. Bioelectrochemistry 2021; 141:107869. [PMID: 34119820 DOI: 10.1016/j.bioelechem.2021.107869] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 05/26/2021] [Accepted: 05/28/2021] [Indexed: 12/18/2022]
Abstract
The formation of transient pores in their membranes is a well-known mechanism of permeabilization of cells exposed to high-intensity electric pulses. However, the formation of such pores is not able to explain all aspects of the so-called electroporation phenomenon. In particular, the reasons for sustained permeability of cell membranes, persisting long after the pulses' application, remain elusive. The complete resealing of cell membranes takes indeed orders of magnitude longer than the time for electropore closure as reported from molecular dynamics (MD) investigations. Lipid peroxidation has been suggested as a possible mechanism to explain the sustainable permeability of cell membranes. However, theoretical investigations of membrane lesions containing excess amounts of hydroperoxides have shown that the conductivities of such lesions were not high enough to account for the experimental measurements. Here, expanding on these studies, we investigate quantitatively the permeability of cell membrane lesions that underwent secondary oxidation. MD simulations and free energy calculations of lipid bilayers show that such lesions provide a better model of post-pulse permeable and conductive electropermeabilized cells. These results are further discussed in the context of sonoporation and ferroptosis, respectively a procedure and a phenomenon, among others, in which, alike electroporation, substantial lipid oxidation might be triggered.
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Affiliation(s)
- Daniel Wiczew
- Wroclaw University of Science and Technology, Department of Biomedical Engineering, 50-370 Wroclaw, Poland; Université de Lorraine, CNRS, LPCT, F-54000 Nancy, France.
| | - Natalia Szulc
- Wroclaw University of Science and Technology, Department of Biomedical Engineering, 50-370 Wroclaw, Poland; Université de Lorraine, CNRS, LPCT, F-54000 Nancy, France
| | - Mounir Tarek
- Université de Lorraine, CNRS, LPCT, F-54000 Nancy, France.
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Bjørklund G, Tippairote T, Dadar M, Lizcano F, Aaseth J, Borisova O. The Roles of Dietary, Nutritional and Lifestyle Interventions in Adipose Tissue Adaptation and Obesity. Curr Med Chem 2021; 28:1683-1702. [PMID: 32368968 DOI: 10.2174/0929867327666200505090449] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 03/03/2020] [Accepted: 03/28/2020] [Indexed: 11/22/2022]
Abstract
The obesity and the associated non-communicable diseases (NCDs) are globally increasing in their prevalence. While the modern-day lifestyle required less ventilation of metabolic energy through muscular activities, this lifestyle transition also provided the unlimited accession to foods around the clock, which prolong the daily eating period of foods that contained high calorie and high glycemic load. These situations promote the high continuous flux of carbon substrate availability in mitochondria and induce the indecisive bioenergetic switches. The disrupted bioenergetic milieu increases the uncoupling respiration due to the excess flow of the substrate-derived reducing equivalents and reduces ubiquinones into the respiratory chain. The diversion of the uncoupling proton gradient through adipocyte thermogenesis will then alleviate the damaging effects of free radicals to mitochondria and other organelles. The adaptive induction of white adipose tissues (WAT) to beige adipose tissues (beAT) has shown beneficial effects on glucose oxidation, ROS protection and mitochondrial function preservation through the uncoupling protein 1 (UCP1)-independent thermogenesis of beAT. However, the maladaptive stage can eventually initiate with the persistent unhealthy lifestyles. Under this metabolic gridlock, the low oxygen and pro-inflammatory environments promote the adipose breakdown with sequential metabolic dysregulation, including insulin resistance, systemic inflammation and clinical NCDs progression. It is unlikely that a single intervention can reverse all these complex interactions. A comprehensive protocol that includes dietary, nutritional and all modifiable lifestyle interventions, can be the preferable choice to decelerate, stop, or reverse the NCDs pathophysiologic processes.
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Affiliation(s)
- Geir Bjørklund
- Council for Nutritional and Environmental Medicine (CONEM), Mo i Rana, Norway
| | - Torsak Tippairote
- Doctor of Philosophy Program in Nutrition, Faculty of Medicine Ramathibodi Hospital and Institute of Nutrition, Mahidol University, Bangkok, Thailand
| | - Maryam Dadar
- Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | | | - Jan Aaseth
- Research Department, Innlandet Hospital Trust, Brumunddal, Norway
| | - Olga Borisova
- Odesa I. I. Mechnikov National University, Odessa, Ukraine
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Xiao F, Li X, He J, Zhao J, Wu G, Gong Q, Zhou H, Lin H. Protein kinase PpCIPK1 modulates plant salt tolerance in Physcomitrella patens. PLANT MOLECULAR BIOLOGY 2021; 105:685-696. [PMID: 33543389 DOI: 10.1007/s11103-021-01120-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 01/17/2021] [Indexed: 06/12/2023]
Abstract
This work demonstrates that PpCIPK1, a putative protein kinase, participates in regulating plant salt tolerance in moss Physcomitrella patens. Calcineurin B-Like protein (CBL)-interacting protein kinases (CIPKs) have been reported to be involved in multiple signaling networks and function in plant growth and stress responses, however, their biological functions in non-seed plants have not been well characterized. In this study, we report that PpCIPK1, a putative protein kinase, participates in regulating plant salt tolerance in moss Physcomitrella patens (P. patens). Phylogenetic analysis revealed that PpCIPK1 shared high similarity with its homologs in higher plants. PpCIPK1 transcription level was induced upon salt stress in P. patens. Using homologous recombination, we constructed PpCIPK1 knockout mutant lines (PpCIPK1 KO). Salt sensitivity analysis showed that independent PpCIPK1 KO plants exhibited severe growth inhibition and developmental deficiency of gametophytes under salt stress condition compared to that of wild-type P. patens (WT). Consistently, ionic homeostasis was disrupted in plants due to PpCIPK1 deletion, and high level of H2O2 was accumulated in PpCIPK1 KO than that in WT. Furthermore, PpCIPK1 functions in regulating photosynthetic activity in response to salt stress. Interestingly, we observed that PpCIPK1 could completely rescue the salt-sensitive phenotype of sos2-1 to WT level in Arabidopsis, indicating that AtSOS2 and PpCIPK1 are functionally conserved. In conclusion, our work provides evidence that PpCIPK1 participates in salt tolerance regulation in P. patens.
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Affiliation(s)
- Fei Xiao
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Xiaochuan Li
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Jiaxian He
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Jinfeng Zhao
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Guochun Wu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Qianyuan Gong
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Huapeng Zhou
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China.
| | - Honghui Lin
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, People's Republic of China.
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12
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Ozhogin IV, Zolotukhin PV, Mukhanov EL, Rostovtseva IA, Makarova NI, Tkachev VV, Beseda DK, Metelitsa AV, Lukyanov BS. Novel molecular hybrids of indoline spiropyrans and α-lipoic acid as potential photopharmacological agents: Synthesis, structure, photochromic and biological properties. Bioorg Med Chem Lett 2021; 31:127709. [PMID: 33242575 DOI: 10.1016/j.bmcl.2020.127709] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 11/16/2020] [Accepted: 11/18/2020] [Indexed: 11/18/2022]
Abstract
Organic photochromic compounds are attracting great interest as photoswitchable components of various bioconjugates for using in photopharmacology, targeted drug delivery and bio-imaging. Here we report on the synthesis of two novel molecular hybrids of indoline spiropyrans and alpha-lipoic acid via an esterification reaction. Preliminary photochemical studies revealed photochromic activity of 5-methoxy-substituted spirocompounds in their acetonitrile solutions. Both hybrid spiropyrans along with their parent substances in the hybrids were tested for the short-term cytotoxicity on HeLa cell cultures. The results of cytotoxicity studies showed unpredictable biocompatibility of the hybrids in comparison with the parent hydroxyl-substituted spiropyrans and α-lipoic acid, especially at the relatively high concentration of 2 mM. Using flow cytometry, we demonstrated that the both hybrids induced antioxidant response in the model cells. After the 24 h treatment, the hybrids administered at lower (500 µM) concentration caused suppressed cytosolic ROS and/or induced cellular thiols. At higher concentration, one of the hybrids demonstrated properties qualitatively similar to alpha-lipoic acid, yet far more strong. Together, flow cytometry results suggested that both hybrids of spiropyrans possess emergent biochemical and signaling antioxidant properties, exceeding those of alpha-lipoic acid.
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Affiliation(s)
- Ilya V Ozhogin
- Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachka Ave., 344090 Rostov-on-Don, Russian Federation.
| | - Peter V Zolotukhin
- Academy of Biology and Biotechnology, Southern Federal University, 194/1 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
| | - Eugene L Mukhanov
- Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
| | - Irina A Rostovtseva
- Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
| | - Nadezhda I Makarova
- Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
| | - Valery V Tkachev
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 Akad. Semenova Ave., 142432 Chernogolovka, Moscow Region, Russian Federation
| | - Darya K Beseda
- Academy of Biology and Biotechnology, Southern Federal University, 194/1 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
| | - Anatoly V Metelitsa
- Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
| | - Boris S Lukyanov
- Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachka Ave., 344090 Rostov-on-Don, Russian Federation
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13
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Saliev T, Baiskhanova D, Beznosko D, Begimbetova D, Umbayev B, Nurgozhin T, Fakhradiyev I, Tanabayev B, Pavalkis D. A New Insight on the Radioprotective Potential of Epsilon-Aminocaproic Acid. MEDICINA (KAUNAS, LITHUANIA) 2020; 56:E663. [PMID: 33266046 PMCID: PMC7760922 DOI: 10.3390/medicina56120663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/13/2020] [Accepted: 11/19/2020] [Indexed: 12/12/2022]
Abstract
Background and objectives: The aim of the study was to scrutinize the ability of epsilon-aminocaproic acid (EACA) to prevent radiation-induced damage to human cells. Materials and Methods: Human peripheral blood mononuclear cells (PBMCs) were exposed to ionizing radiation at three low doses (22.62 mGy, 45.27 mGy, and 67.88 mGy) in the presence of EACA at the concentration of 50 ng/mL. Results: EACA was able to prevent cell death induced by low-dose X-ray radiation and suppress the formation of reactive oxygen species (ROS). EACA also demonstrated a capacity to protect DNA from radiation-induced damage. The data indicated that EACA is capable of suppression of radiation-induced apoptosis. Comparative tests of antioxidative activity of EACA and a range of free radical scavengers showed an ability of EACA to effectively inhibit the generation of ROS. Conclusions: This study showed that the pretreatment of PBMCs with EACA is able to protect the cells from radiation-elicited damage, including free radicals' formation, DNA damage, and apoptosis.
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Affiliation(s)
- Timur Saliev
- S.D. Asfendiyarov Kazakh National Medical University, Almaty 050000, Kazakhstan; (T.N.); (I.F.)
| | - Dinara Baiskhanova
- National Laboratory Astana, Nazarbayev University, Nur-Sultan 010000, Kazakhstan; (D.B.); (D.B.); (B.U.)
| | | | - Dinara Begimbetova
- National Laboratory Astana, Nazarbayev University, Nur-Sultan 010000, Kazakhstan; (D.B.); (D.B.); (B.U.)
| | - Bauyrzhan Umbayev
- National Laboratory Astana, Nazarbayev University, Nur-Sultan 010000, Kazakhstan; (D.B.); (D.B.); (B.U.)
| | - Talgat Nurgozhin
- S.D. Asfendiyarov Kazakh National Medical University, Almaty 050000, Kazakhstan; (T.N.); (I.F.)
| | - Ildar Fakhradiyev
- S.D. Asfendiyarov Kazakh National Medical University, Almaty 050000, Kazakhstan; (T.N.); (I.F.)
| | | | - Dainius Pavalkis
- NJSC “Astana Medical University”, Nur-sultan 010000, Kazakhstan;
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14
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Du G, Qiao Y, Zhuo Z, Zhou J, Li X, Liu Z, Li Y, Chen H. Lipoic acid rejuvenates aged intestinal stem cells by preventing age-associated endosome reduction. EMBO Rep 2020; 21:e49583. [PMID: 32648369 PMCID: PMC7403706 DOI: 10.15252/embr.201949583] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 05/15/2020] [Accepted: 05/29/2020] [Indexed: 02/06/2023] Open
Abstract
The age‐associated decline of adult stem cell function is closely related to the decline in tissue function and age‐related diseases. However, the underlying mechanisms that ultimately lead to the observed functional decline of stem cells still remain largely unexplored. This study investigated Drosophila midguts and found a continuous downregulation of lipoic acid synthase, which encodes the key enzyme for the endogenous synthesis of alpha‐lipoic acid (ALA), upon aging. Importantly, orally administration of ALA significantly reversed the age‐associated hyperproliferation of intestinal stem cells (ISCs) and the observed decline of intestinal function, thus extending the lifespan of Drosophila. This study reports that ALA reverses age‐associated ISC dysfunction by promoting the activation of the endocytosis–autophagy network, which decreases in aged ISCs. Moreover, this study suggests that ALA may be used as a safe and effective anti‐aging compound for the treatment of ISC‐dysfunction‐related diseases and for the promotion of healthy aging in humans.
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Affiliation(s)
- Gang Du
- Laboratory for Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yicheng Qiao
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Zhangpeng Zhuo
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Jiaqi Zhou
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xiaorong Li
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Zhiming Liu
- Laboratory for Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
| | - Yang Li
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Haiyang Chen
- Laboratory for Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
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15
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Shi C, Wang P, Airen S, Brown C, Liu Z, Townsend JH, Wang J, Jiang H. Nutritional and medical food therapies for diabetic retinopathy. EYE AND VISION (LONDON, ENGLAND) 2020; 7:33. [PMID: 32582807 PMCID: PMC7310218 DOI: 10.1186/s40662-020-00199-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 05/28/2020] [Indexed: 02/07/2023]
Abstract
Diabetic retinopathy (DR) is a form of microangiopathy. Reducing oxidative stress in the mitochondria and cell membranes decreases ischemic injury and end-organ damage to the retina. New approaches are needed, which reduce the risk and improve the outcomes of DR while complementing current therapeutic approaches. Homocysteine (Hcy) elevation and oxidative stress are potential therapeutic targets in DR. Common genetic polymorphisms such as those of methylenetetrahydrofolate reductase (MTHFR), increase Hcy and DR risk and severity. Patients with DR have high incidences of deficiencies of crucial vitamins, minerals, and related compounds, which also lead to elevation of Hcy and oxidative stress. Addressing the effects of the MTHFR polymorphism and addressing comorbid deficiencies and insufficiencies reduce the impact and severity of the disease. This approach provides safe and simple strategies that support conventional care and improve outcomes. Suboptimal vitamin co-factor availability also impairs the release of neurotrophic and neuroprotective growth factors. Collectively, this accounts for variability in presentation and response of DR to conventional therapy. Fortunately, there are straightforward recommendations for addressing these issues and supporting traditional treatment plans. We have reviewed the literature for nutritional interventions that support conventional therapies to reduce disease risk and severity. Optimal combinations of vitamins B1, B2, B6, L-methylfolate, methylcobalamin (B12), C, D, natural vitamin E complex, lutein, zeaxanthin, alpha-lipoic acid, and n-acetylcysteine are identified for protecting the retina and choroid. Certain medical foods have been successfully used as therapy for retinopathy. Recommendations based on this review and our clinical experience are developed for clinicians to use to support conventional therapy for DR. DR from both type 1 diabetes mellitus (T1DM) and type 2 diabetes mellitus (T2DM) have similar retinal findings and responses to nutritional therapies.
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Affiliation(s)
- Ce Shi
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10th Avenue, McKnight Building - Room 202A, Miami, FL 33136 USA
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Peng Wang
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10th Avenue, McKnight Building - Room 202A, Miami, FL 33136 USA
- Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Shriya Airen
- College of Arts and Sciences, University of Miami, Miami, FL USA
| | - Craig Brown
- Department of Ophthalmology, College of Medicine, the University of Arkansas for Medical Sciences, Fayetteville, AR USA
| | - Zhiping Liu
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10th Avenue, McKnight Building - Room 202A, Miami, FL 33136 USA
- Ophthalmic Center, the Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong China
| | - Justin H. Townsend
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10th Avenue, McKnight Building - Room 202A, Miami, FL 33136 USA
| | - Jianhua Wang
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10th Avenue, McKnight Building - Room 202A, Miami, FL 33136 USA
| | - Hong Jiang
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10th Avenue, McKnight Building - Room 202A, Miami, FL 33136 USA
- Department of Neurology, University of Miami Miller School of Medicine, Miami, FL USA
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16
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Chen H, Zhang J, Dai Y, Xu J. Nerve growth factor inhibits TLR3-induced inflammatory cascades in human corneal epithelial cells. JOURNAL OF INFLAMMATION-LONDON 2019; 16:27. [PMID: 31889912 PMCID: PMC6933932 DOI: 10.1186/s12950-019-0232-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 12/18/2019] [Indexed: 12/14/2022]
Abstract
Background In herpes simplex epithelial keratitis, excessive TLR3-induced cellular responses after virus infection evoke inflammatory cascades that might be destructive to the host cornea. Nerve growth factor (NGF), a pluripotent neurotrophic factor with immune regulatory effect, was proved to be effective in Herpes simplex keratitis (HSK) treatment, although the detailed mechanisms remain unclear. This study aims to investigate the effects of NGF on modulating inflammatory responses triggered by TLR3 activation in human corneal epithelial cells (HCECs) in vitro. Methods HCECs were stimulated with TLR3 agonist, poly(I:C), in the absence or presence of NGF. Cell viability and cytotoxicity were measured by a CCK-8 assay and LDH release assay, respectively. The activation of NF-κB signaling pathway was examined using immunofluorescence staining and western blotting. Levels of proinflammatory cytokines were determined by ELISA or RT-qPCR. ROS generation and 8-OHdG positive cells were examined by a fluorometric analysis. Results It was shown that NGF significantly inhibited the generation of proinflammatory cytokines in HCECs triggered by TLR3 activation (P < 0.05), probably via suppressing NF-κB activation. NGF also impeded the upstream signal to initiate NF-κB activation by scavenging ROS by approximately 50% (P < 0.05). In addition, 8-OHdG positive cells were substantially attenuated by NGF treatment (P < 0.01). Conclusions Taken together, this study indicates that NGF could inhibit TLR3-induced inflammatory cascades in HCECs, suggesting NGF as a potential therapeutic agent for HSK.
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Affiliation(s)
- Huiyu Chen
- Department of Ophthalmology and Visual Science, Eye & ENT Hospital, NHC Key Laboratory of myopia (Fudan University); Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai Medical College of Fudan University, Shanghai, 200031 China
| | - Jing Zhang
- Department of Ophthalmology and Visual Science, Eye & ENT Hospital, NHC Key Laboratory of myopia (Fudan University); Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai Medical College of Fudan University, Shanghai, 200031 China
| | - Yiqin Dai
- Department of Ophthalmology and Visual Science, Eye & ENT Hospital, NHC Key Laboratory of myopia (Fudan University); Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai Medical College of Fudan University, Shanghai, 200031 China
| | - Jianjiang Xu
- Department of Ophthalmology and Visual Science, Eye & ENT Hospital, NHC Key Laboratory of myopia (Fudan University); Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai Medical College of Fudan University, Shanghai, 200031 China
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17
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Wu G, Li S, Li X, Liu Y, Zhao S, Liu B, Zhou H, Lin H. A Functional Alternative Oxidase Modulates Plant Salt Tolerance in Physcomitrella patens. PLANT & CELL PHYSIOLOGY 2019; 60:1829-1841. [PMID: 31119292 DOI: 10.1093/pcp/pcz099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 05/14/2019] [Indexed: 05/13/2023]
Abstract
Alternative oxidase (AOX) has been reported to be involved in mitochondrial function and redox homeostasis, thus playing an essential role in plant growth as well as stress responses. However, its biological functions in nonseed plants have not been well characterized. Here, we report that AOX participates in plant salt tolerance regulation in moss Physcomitrella patens (P. patens). AOX is highly conserved and localizes to mitochondria in P. patens. We observed that PpAOX rescued the impaired cyanide (CN)-resistant alternative (Alt) respiratory pathway in Arabidopsis thaliana (Arabidopsis) aox1a mutant. PpAOX transcription and Alt respiration were induced upon salt stress in P. patens. Using homologous recombination, we generated PpAOX-overexpressing lines (PpAOX OX). PpAOX OX plants exhibited higher Alt respiration and lower total reactive oxygen species accumulation under salt stress condition. Strikingly, we observed that PpAOX OX plants displayed decreased salt tolerance. Overexpression of PpAOX disturbed redox homeostasis in chloroplasts. Meanwhile, chloroplast structure was adversely affected in PpAOX OX plants in contrast to wild-type (WT) P. patens. We found that photosynthetic activity in PpAOX OX plants was also lower compared with that in WT. Together, our work revealed that AOX participates in plant salt tolerance in P. patens and there is a functional link between mitochondria and chloroplast under challenging conditions.
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Affiliation(s)
- Guochun Wu
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Sha Li
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Xiaochuan Li
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Yunhong Liu
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Shuangshuang Zhao
- Key Laboratory of Plant Stress, Life Science College, Shandong Normal University, Jinan, China
| | - Baohui Liu
- School of Life Sciences, Guangzhou University, Guangzhou, China
| | - Huapeng Zhou
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Honghui Lin
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
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18
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Modgil S, Bammidi S, Banik A, Sharma VL, Anand A. Alpha lipoic acid attenuates the long-term effects of lead exposure in retinal ischemic injury mouse model. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:15548-15558. [PMID: 30945075 DOI: 10.1007/s11356-019-04700-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 02/25/2019] [Indexed: 06/09/2023]
Abstract
Lead (Pb) exposure is reported to be unsafe for humans. There have been several studies documenting acute and chronic Pb toxicity on the organ systems. New studies suggest that early-life exposure to such environmental toxins may increase the susceptibility to late-onset degenerative disorders. We aimed to examine the long-term effects of early-life postnatal exposure of Pb on retinal degeneration. Pb exposure (200 ppm) was provided either at postnatal day 1 through lactation (early-life exposure) or at 7th week of age (adulthood exposure) directly through drinking water for 20 days. The Pb-treated mice were followed till 20 weeks of age. At 20th week, ischemia/reperfusion (I/R) injury was induced in these mice by pterygopalatine artery ligation. Further, alpha lipoic acid (ALA) was administered to examine its neuroprotective effects against retinal damage. Histological and molecular analysis revealed that Pb-treated mice had greater retinal damage after I/R injury as compared to untreated or ALA treated mice, suggesting that ALA protects the early-life Pb exposure and its consequent impact on later life. The elevated levels of glial derived neurotrophic factor (GDNF) and ciliary neurotrophic factor (CNTF) and reduced levels of glial fibrillary acidic protein (GFAP) upon ALA pre-treatment suggest that it probably exerts anti-inflammatory effects via upregulation of neurotrophic factors.
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Affiliation(s)
- Shweta Modgil
- Neuroscience Research Lab, Department of Neurology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
- Department of Zoology, Panjab University, Chandigarh, India
| | - Sridhar Bammidi
- Neuroscience Research Lab, Department of Neurology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Avijit Banik
- Department of Pharmacology, Emory University School of Medicine, Rollins Research Center, Atlanta, USA
| | | | - Akshay Anand
- Neuroscience Research Lab, Department of Neurology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
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19
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Oxidative stress and reactive oxygen species: a review of their role in ocular disease. Clin Sci (Lond) 2017; 131:2865-2883. [DOI: 10.1042/cs20171246] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 10/26/2017] [Accepted: 11/06/2017] [Indexed: 12/13/2022]
Abstract
For many years, oxidative stress arising from the ubiquitous production of reactive oxygen species (ROS) has been implicated in the pathogenesis of various eye diseases. While emerging research has provided some evidence of the important physiological role of ROS in normal cell function, disease may arise where the concentration of ROS exceeds and overwhelms the body’s natural defence against them. Additionally, ROS may induce genomic aberrations which affect cellular homoeostasis and may result in disease. This literature review examines the current evidence for the role of oxidative stress in important ocular diseases with a view to identifying potential therapeutic targets for future study. The need is particularly pressing in developing treatments for conditions which remain notoriously difficult to treat, including glaucoma, diabetic retinopathy and age-related macular degeneration.
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20
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Chen X, Hall H, Simpson JP, Leon-Salas WD, Ready DF, Weake VM. Cytochrome b5 protects photoreceptors from light stress-induced lipid peroxidation and retinal degeneration. NPJ Aging Mech Dis 2017; 3:18. [PMID: 29214051 PMCID: PMC5712525 DOI: 10.1038/s41514-017-0019-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/27/2017] [Accepted: 10/31/2017] [Indexed: 01/06/2023] Open
Abstract
Lipid peroxides are generated by oxidative stress in cells, and contribute to ageing and neurodegenerative disease. The eye is at special risk for lipid peroxidation because photoreceptors possess amplified sensory membranes rich in peroxidation-susceptible polyunsaturated fatty acids. Light-induced lipid peroxidation in the retina contributes to retinal degeneration, and lipid peroxidation has been implicated in the progression of age-associated ocular diseases such as age-related macular degeneration (AMD). Here, we show that exposing Drosophila melanogaster to strong blue light induces oxidative stress including lipid peroxidation that results in retinal degeneration. Surprisingly, very young flies are resilient to this acute light stress, suggesting they possess endogenous neuroprotective mechanisms. While lipophilic antioxidants partially suppressed blue light-induced retinal degeneration in older flies, we find that overexpression of cytochrome b5 (Cyt-b5) completely suppressed both blue light-induced lipid peroxidation and retinal degeneration. Our data identify Cyt-b5 as a neuroprotective factor that targets light-induced oxidative damage, particularly lipid peroxidation. Cyt-b5 may function via supporting antioxidant recycling, thereby providing a strategy to prevent oxidative stress in ageing photoreceptors that would be synergistic with dietary antioxidant supplementation. Paradoxically, light is essential for vision, yet it also induces stress that damages the sensitive cells in the eye. Vikki Weake and her team at Purdue University examined how exposure to blue light causes damage to the retina in fruit flies. Blue light causes death of photoreceptors, the light-sensing neurons. Surprisingly, very young flies are resistant to blue light. Increasing levels of a single protein, Cytochrome-b5, mimicked youthful resilience in older flies. Cytochrome-b5 is central to an ancient cellular defense system that protects membranes from oxidative damage. With expansive sensory membranes containing specialized lipids, photoreceptors are especially sensitive to membrane lipid peroxidation, an emerging final common pathway for cell death in aging and disease. Research into preventing lipid peroxidation might help to develop therapies for age-related diseases such as age-related macular degeneration.
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Affiliation(s)
- Xinping Chen
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907 USA.,Present Address: University of Notre Dame, Notre Dame, IN 46556 USA
| | - Hana Hall
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907 USA
| | - Jeffrey P Simpson
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907 USA
| | - Walter D Leon-Salas
- Purdue Polytechnic Institute, Purdue University, West Lafayette, IN 47907 USA
| | - Donald F Ready
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907 USA
| | - Vikki M Weake
- Department of Biochemistry, Purdue University, West Lafayette, IN 47907 USA.,Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN 47907 USA
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21
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Moos WH, Faller DV, Glavas IP, Harpp DN, Irwin MH, Kanara I, Pinkert CA, Powers WR, Steliou K, Vavvas DG, Kodukula K. Epigenetic Treatment of Neurodegenerative Ophthalmic Disorders: An Eye Toward the Future. Biores Open Access 2017; 6:169-181. [PMID: 29291141 PMCID: PMC5747116 DOI: 10.1089/biores.2017.0036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Eye disease is one of the primary medical conditions that requires attention and therapeutic intervention in ageing populations worldwide. Further, the global burden of diabetes and obesity, along with heart disease, all lead to secondary manifestations of ophthalmic distress. Therefore, there is increased interest in developing innovative new approaches that target various mechanisms and sequelae driving conditions that result in adverse vision. The research challenge is even greater given that the terrain of eye diseases is difficult to landscape into a single therapeutic theme. This report addresses the burden of eye disease due to mitochondrial dysfunction, including antioxidant, autophagic, epigenetic, mitophagic, and other cellular processes that modulate the biomedical end result. In this light, we single out lipoic acid as a potent known natural activator of these pathways, along with alternative and potentially more effective conjugates, which together harness the necessary potency, specificity, and biodistribution parameters required for improved therapeutic outcomes.
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Affiliation(s)
- Walter H. Moos
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of California San Francisco, San Francisco, California
- ShangPharma Innovation, Inc., South San Francisco, California
| | - Douglas V. Faller
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
- Cancer Research Center, Boston University School of Medicine, Boston, Massachusetts
| | - Ioannis P. Glavas
- Department of Ophthalmology, New York University School of Medicine, New York, New York
| | - David N. Harpp
- Department of Chemistry, McGill University, Montreal, QC, Canada
| | - Michael H. Irwin
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, Alabama
| | | | - Carl A. Pinkert
- Department of Biological Sciences, College of Arts and Sciences, The University of Alabama, Tuscaloosa, Alabama
| | - Whitney R. Powers
- Department of Health Sciences, Boston University, Boston, Massachusetts
- Department of Anatomy, Boston University School of Medicine, Boston, Massachusetts
| | - Kosta Steliou
- Cancer Research Center, Boston University School of Medicine, Boston, Massachusetts
- PhenoMatriX, Inc., Natick, Massachusetts
| | - Demetrios G. Vavvas
- Retina Service, Angiogenesis Laboratory, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Krishna Kodukula
- ShangPharma Innovation, Inc., South San Francisco, California
- PhenoMatriX, Inc., Natick, Massachusetts
- Bridgewater College, Bridgewater, Virginia
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22
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Neurochemical effects of the R form of α-lipoic acid and its neuroprotective mechanism in cellular models of Parkinson’s disease. Int J Biochem Cell Biol 2017; 87:86-94. [DOI: 10.1016/j.biocel.2017.04.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 03/27/2017] [Accepted: 04/05/2017] [Indexed: 11/18/2022]
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Zhang J, Zhou X, Wu W, Wang J, Xie H, Wu Z. Regeneration of glutathione by α-lipoic acid via Nrf2/ARE signaling pathway alleviates cadmium-induced HepG2 cell toxicity. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 51:30-37. [PMID: 28262510 DOI: 10.1016/j.etap.2017.02.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Revised: 02/22/2017] [Accepted: 02/26/2017] [Indexed: 06/06/2023]
Abstract
Alpha-lipoic acid (α-LA) is an important antioxidant that is capable of regenerating other antioxidants, such as glutathione (GSH). However, the underlying molecular mechanism by which α-LA regenerates GSH remains poorly understood. The current study aimed to investigate whether α-LA regenerates GSH by activation of Nrf2 to alleviate cadmium-induced cytotoxicity in HepG2 cells. In the present study, we found that cadmium induced cell death by depletion of GSH through inactivation of Nrf2. Addition of α-LA to cadmium-treated cells reactivated Nrf2 and regenerated GSH through elevating the Nrf2-downstream genes γ-glutamate-cysteine ligase (γ-GCL) and GR, both of which are key enzymes for GSH synthesis. However, blocking Nrf2 with brusatol in the cells co-treated with α-LA and cadmium reduced the mRNA and the protein levels of γ-GCL and GR, thus suppressed GSH regeneration by α-LA. Our results indicated that α-LA activated Nrf2 signaling pathway, which upregulated the transcription of the enzymes for GSH synthesis and therefore GSH contents to alleviate cadmium-induced cytotoxicity in HepG2 cells.
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Affiliation(s)
- Jiayu Zhang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Xue Zhou
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Wenbo Wu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Jiachun Wang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Hong Xie
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Zhigang Wu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China.
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Wojsiat J, Laskowska-Kaszub K, Alquézar C, Białopiotrowicz E, Esteras N, Zdioruk M, Martin-Requero A, Wojda U. Familial Alzheimer's Disease Lymphocytes Respond Differently Than Sporadic Cells to Oxidative Stress: Upregulated p53-p21 Signaling Linked with Presenilin 1 Mutants. Mol Neurobiol 2016; 54:5683-5698. [PMID: 27644130 PMCID: PMC5533859 DOI: 10.1007/s12035-016-0105-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 09/06/2016] [Indexed: 01/18/2023]
Abstract
Familial (FAD) and sporadic (SAD) Alzheimer's disease do not share all pathomechanisms, but knowledge on their molecular differences is limited. We previously reported that cell cycle control distinguishes lymphocytes from SAD and FAD patients. Significant differences were found in p21 levels of SAD compared to FAD lymphocytes. Since p21 can also regulate apoptosis, the aim of this study was to compare the response of FAD and SAD lymphocytes to oxidative stress like 2-deoxy-D-ribose (2dRib) treatment and to investigate the role of p21 levels in this response. We report that FAD cells bearing seven different PS1 mutations are more resistant to 2dRib-induced cell death than control or SAD cells: FAD cells showed a lower apoptosis rate and a lower depolarization of the mitochondrial membrane. Despite that basal p21 cellular content was lower in FAD than in SAD cells, in response to 2dRib, p21 mRNA and protein levels significantly increased in FAD cells. Moreover, we found a higher cytosolic accumulation of p21 in FAD cells. The transcriptional activation of p21 was shown to be dependent on p53, as it can be blocked by PFT-α, and correlated with the increased phosphorylation of p53 at Serine 15. Our results suggest that in FAD lymphocytes, the p53-mediated increase in p21 transcription, together with a shift in the nucleocytoplasmic localization of p21, confers a survival advantage against 2dRib-induced apoptosis. This compensatory mechanism is absent in SAD cells. Thus, therapeutic and diagnostic designs should take into account possible differential apoptotic responses in SAD versus FAD cells.
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Affiliation(s)
- Joanna Wojsiat
- Laboratory of Preclinical Testing of Higher Standard, Nencki Institute of Experimental Biology, Pasteur 3, 02-093, Warsaw, Poland
| | - Katarzyna Laskowska-Kaszub
- Laboratory of Preclinical Testing of Higher Standard, Nencki Institute of Experimental Biology, Pasteur 3, 02-093, Warsaw, Poland
| | - Carolina Alquézar
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
- CIBER de Enfermedades Raras (CIBERER), 28040, Madrid, Spain
| | - Emilia Białopiotrowicz
- Laboratory of Preclinical Testing of Higher Standard, Nencki Institute of Experimental Biology, Pasteur 3, 02-093, Warsaw, Poland
| | - Noemi Esteras
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
- CIBER de Enfermedades Raras (CIBERER), 28040, Madrid, Spain
| | - Mykola Zdioruk
- Laboratory of Preclinical Testing of Higher Standard, Nencki Institute of Experimental Biology, Pasteur 3, 02-093, Warsaw, Poland
| | - Angeles Martin-Requero
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
- CIBER de Enfermedades Raras (CIBERER), 28040, Madrid, Spain
| | - Urszula Wojda
- Laboratory of Preclinical Testing of Higher Standard, Nencki Institute of Experimental Biology, Pasteur 3, 02-093, Warsaw, Poland.
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Tao Y, Jiang P, Wei Y, Wang P, Sun X, Wang H. α-Lipoic Acid Treatment Improves Vision-Related Quality of Life in Patients with Dry Age-Related Macular Degeneration. TOHOKU J EXP MED 2016; 240:209-214. [DOI: 10.1620/tjem.240.209] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Yuan Tao
- Department of Opthalmology, the Second People’s Hospital of Jinan City
| | - Pengfei Jiang
- Department of Opthalmology, Yantai Yuhuangding Hospital
| | - Yuhua Wei
- Department of Medicine, Qilu Hospital of Shandong University
| | - Ping Wang
- Department of Surgery, Qilu Hospital of Shandong University
| | - Xiaoling Sun
- Department of Surgery, Yantai Yuhuangding Hospital
| | - Hong Wang
- Department of Opthalmology, Qilu Hospital of Shandong University
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26
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Liu X, Ward K, Xavier C, Jann J, Clark AF, Pang IH, Wu H. The novel triterpenoid RTA 408 protects human retinal pigment epithelial cells against H2O2-induced cell injury via NF-E2-related factor 2 (Nrf2) activation. Redox Biol 2015; 8:98-109. [PMID: 26773873 PMCID: PMC4731949 DOI: 10.1016/j.redox.2015.12.005] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Revised: 12/16/2015] [Accepted: 12/16/2015] [Indexed: 01/07/2023] Open
Abstract
Oxidative stress-induced retinal pigment epithelial (RPE) cell damage is an important factor in the pathogenesis of age-related macular degeneration (AMD). Previous studies have shown that RTA 408, a synthetic triterpenoid compound, potently activates Nrf2. This study aimed to investigate the protective effects of RTA 408 in cultured RPE cells during oxidative stress and to determine the effects of RTA 408 on Nrf2 and its downstream target genes. Primary human RPE cells were pretreated with RTA 408 and then incubated in 200μM H2O2 for 6h. Cell viability was measured with the WST-8 assay. Apoptosis was quantitatively measured by annexin V/propidium iodide (PI) double staining and Hoechst 33342 fluorescent staining. Reduced (GSH) and oxidized glutathione (GSSG) were measured using colorimetric assays. Nrf2 activation and its downstream effects on phase II enzymes were examined by Western blot. Treatment of RPE cells with nanomolar ranges (10 and 100nM) of RTA 408 markedly attenuated H2O2-induced viability loss and apoptosis. RTA 408 pretreatment significantly protected cells from oxidative stress-induced GSH loss, GSSG formation and decreased ROS production. RTA 408 activated Nrf2 and increased the expression of its downstream genes, such as HO-1, NQO1, SOD2, catalase, Grx1, and Trx1. Consequently, the enzyme activities of NQO1, Grx1, and Trx1 were fully protected by RTA 408 pretreatment under oxidative stress. Moreover, knockdown of Nrf2 by siRNA significantly reduced the cytoprotective effects of RTA 408. In conclusion, our data suggest that RTA 408 protect primary human RPE cells from oxidative stress-induced damage by activating Nrf2 and its downstream genes.
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Affiliation(s)
- Xiaobin Liu
- Pharmaceutical Sciences, University of North Texas System College of Pharmacy, University of North Texas Health Science Center, Fort Worth, TX, USA
| | - Keith Ward
- REATA Pharmaceuticals, Inc., Irving, TX, USA
| | - Christy Xavier
- Pharmaceutical Sciences, University of North Texas System College of Pharmacy, University of North Texas Health Science Center, Fort Worth, TX, USA
| | - Jamieson Jann
- Pharmaceutical Sciences, University of North Texas System College of Pharmacy, University of North Texas Health Science Center, Fort Worth, TX, USA
| | - Abbot F Clark
- Department of Cell Biology & Immunology, UNTHSC, Ft. Worth, TX, USA; North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, TX, USA
| | - Iok-Hou Pang
- Pharmaceutical Sciences, University of North Texas System College of Pharmacy, University of North Texas Health Science Center, Fort Worth, TX, USA; North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, TX, USA
| | - Hongli Wu
- Pharmaceutical Sciences, University of North Texas System College of Pharmacy, University of North Texas Health Science Center, Fort Worth, TX, USA; North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, TX, USA; Institute for Cancer Research, University of North Texas Health Science Center, Fort Worth, TX, USA
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27
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Najafi R, Sharifi AM, Hosseini A. Protective effects of alpha lipoic acid on high glucose-induced neurotoxicity in PC12 cells. Metab Brain Dis 2015; 30:731-8. [PMID: 25404528 DOI: 10.1007/s11011-014-9625-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 10/21/2014] [Indexed: 12/16/2022]
Abstract
Hyperglycemia plays an important role in the development of diabetic neuropathy. In this study, we investigated the protective effects of alpha lipoic acid (ALA) against high glucose-induced neurotoxicity in PC12 cells as a suitable in vitro model for studying neuronal functions. PC12 cells were treated with high glucose (25 mg/ml for 24 h) in the absence and presence of ALA (100 μM for 24 h). The viability of PC12 cells was estimated by using MTT assay. The expression of pro- apoptotic Bax, anti- apoptotic Bcl-2 and caspase 3 protein were evaluated by western blotting. The reactive oxygen species (ROS) levels were determined with 2,7-dichlorodihydro- fluorescein diacetate (H2DCFDA). Biochemical markers of oxidative stress were assessed by using the total antioxidant power (TAP), lipid peroxidation (LPO), ADP/ATP ratio, activity of antioxidant enzymes catalase (CAT) and superoxide dismutase (SOD). Pretreatment of PC12 cells with ALA, significantly improved high glucose-induced toxicity by increasing activity of antioxidant enzymes CAT and SOD in the PC12 cell. It also increased the concentrations of TAP. An elevated level of cell death and ROS in high glucose conditions, diminished with ALA treatment. Over expression of Bax and caspase 3 protein, elevation of ADP/ATP ratio and LPO level in high glucose- treated PC12 cells, were significantly reduced by ALA. It was concluded that ALA attenuates neurotoxicity induced by high glucose in PC12 cells.
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Affiliation(s)
- Rezvan Najafi
- Razi Drug Research Center, Iran University of Medical Sciences, Tehran, 1449614535, Iran
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28
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Hatami S, Zavareh S, Salehnia M, Lashkarbolouki T, Karimi I. Comparison of oxidative status of mouse pre-antral follicles derived from vitrified whole ovarian tissue and vitrified pre-antral follicles in the presence of alpha lipoic acid. J Obstet Gynaecol Res 2015; 40:1680-8. [PMID: 24888934 DOI: 10.1111/jog.12394] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Accepted: 12/19/2013] [Indexed: 11/29/2022]
Abstract
AIM The main goal of this study was to compare developmental competence and oxidative status of vitrified-warmed pre-antral follicles (VPF) with pre-antral follicles derived from vitrified-warmed ovarian tissue (VOF) in the presence of alpha lipoic acid (ALA). MATERIALS AND METHODS Ovarian tissue and isolated pre-antral follicles were exposed to equilibration solution and then vitrification solution. After thawing of LN2 snap-frozen samples, pre-antral follicles were cultured with or without ALA for 12 days that followed by hCG-induced ovulation. MII oocytes were in vitro fertilized and embryo cleavage assessed. Reactive oxygen species (ROS) and total antioxidant capacity (TAC) levels of cultured pre-antral follicles were measured. RESULTS The rates of survival, antral-like cavity formation, MII oocytes, fertilization, 2-cell embryo and blastocyst development were higher in VPF compared to VOF. These rates were higher in ALA-supplemented groups in comparison to their respective groups. An increase and a decrease in ROS production and TAC levels were observed up to the 96 h during cultivation period, respectively. ROS level was lower in cultured VPF compared to VOF. In ALA-treated groups, ROS level decreased to reach comparable values of starting point and TAC levels increased after 24 h of culture and then remained constant. CONCLUSION Developmental outcomes showed vitrification of pre-antral follicles is more appropriate method than that of whole ovarian tissue. Moreover, it seems that inclusion of ALA improved in vitro development of pre-antral follicles in both vitrified and non-vitrified samples.
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Affiliation(s)
- Sahar Hatami
- School of Biology, Damghan University, Damghan, Islamic Republic of Iran
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29
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Zhao L, Wang C, Song D, Li Y, Song Y, Su G, Dunaief JL. Systemic administration of the antioxidant/iron chelator α-lipoic acid protects against light-induced photoreceptor degeneration in the mouse retina. Invest Ophthalmol Vis Sci 2014; 55:5979-88. [PMID: 25146987 DOI: 10.1167/iovs.14-15025] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
PURPOSE Oxidative stress and inflammation have key roles in the light damage (LD) model of retinal degeneration as well as in age-related macular degeneration (AMD). We sought to determine if lipoic acid (LA), an antioxidant and iron chelator, protects the retina against LD. METHODS Balb/c mice were treated with LA or control saline via intraperitoneal injection, and then were placed in constant cool white light-emitting diode (LED) light (10,000 lux) for 4 hours. Retinas were evaluated at several time points after LD. Photoreceptor apoptosis was assessed using the TUNEL assay. Retinal function was analyzed via electroretinography (ERG). Retinal degeneration was assessed after LD by optical coherence tomography (OCT), TUNEL analysis, and histology. The mRNAs of several oxidative stress, inflammation, and iron-related genes were quantified by quantitative PCR (qPCR). RESULTS The LD resulted in substantial photoreceptor-specific cell death. Dosing with LA protected photoreceptors, decreasing the numbers of TUNEL-positive photoreceptors and increasing the number of surviving photoreceptors. The retinal mRNA levels of genes indicating oxidative stress, inflammation, and iron accumulation were lower following LD in mice treated with LA than in control mice. The ERG analysis demonstrated functional protection by LA. CONCLUSIONS Systemic LA is protective against light-induced retinal degeneration. Since this agent already has proven protective in other retinal degeneration models, and is safe and protective against diabetic neuropathy in patients, it is worthy of consideration for a human clinical trial against retinal degeneration or AMD.
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Affiliation(s)
- Liangliang Zhao
- Department of Ophthalmology, The Second Hospital of Jilin University, Jilin, China F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Chenguang Wang
- Department of Ophthalmology, The Second Hospital of Jilin University, Jilin, China F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Delu Song
- F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Yafeng Li
- F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Ying Song
- F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Guanfang Su
- Department of Ophthalmology, The Second Hospital of Jilin University, Jilin, China
| | - Joshua L Dunaief
- F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
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30
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Hatami S, Zavareh S, Salehnia M, Lashkarbolouki T, Ghorbanian MT, Karimi I. The impact of alpha lipoic acid on developmental competence of mouse vitrified pre-antral follicles in comparison to those isolated from vitrified ovaries. IRANIAN JOURNAL OF REPRODUCTIVE MEDICINE 2014; 12:57-64. [PMID: 24799862 PMCID: PMC4009583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 08/29/2013] [Accepted: 09/15/2013] [Indexed: 10/29/2022]
Abstract
BACKGROUND Cryopreservation of ovarian tissues and pre-antral follicles is a promising prospect for preservation of women fertility. OBJECTIVE The aim of this study was to evaluate the in vitro developmental competence of mouse vitrified pre-antral follicles in comparison to isolated pre-antral follicles derived from vitrified ovaries in the presence of alpha lipoic acid (ALA). MATERIALS AND METHODS Pre-antral follicles derived from fresh, vitrified-warmed ovarian tissues and vitrified-warmed pre-antral follicles were cultured individually with or without ALA, followed by adding hCG to induce ovulation. The follicle growth, oocyte maturation, and embryo development were assessed. RESULTS The diameter and development of follicles, oocyte maturation and embryo development rates were significantly higher in ALA supplemented groups compared to the respective ALA-free conditions groups. Aforementioned parameters were significantly higher in vitrified-warmed follicles in comparison to follicles derived from vitrified-warmed ovaries. CONCLUSION These findings support a superior performance of pre-antral follicles when vitrified rather than when isolated from vitrified ovaries with regard to increasing the rates of developmental parameters. Moreover, ALA improves the in vitro maturation of pre-antral follicles in vitrified and non-vitrified samples. This article extracted from M.Sc. thesis. (Sahar Hatami).
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Affiliation(s)
- Sahar Hatami
- School of Biology, Damghan University, Damghan, Iran.
| | - Saeed Zavareh
- School of Biology, Damghan University, Damghan, Iran.,Institute of Biological Sciences, Damghan University, Damghan, Iran.
| | - Mojdeh Salehnia
- Department of Anatomy, Tarbiat Modares University, Tehran, Iran.
| | - Taghi Lashkarbolouki
- School of Biology, Damghan University, Damghan, Iran.,Institute of Biological Sciences, Damghan University, Damghan, Iran.
| | - Mohammad Taghi Ghorbanian
- School of Biology, Damghan University, Damghan, Iran.,Institute of Biological Sciences, Damghan University, Damghan, Iran.
| | - Isaac Karimi
- Laboratory of Molecular and Cellular Biology, Department of Basic Veterinary Sciences, School of Veterinary Medicine, Razi University, Kermanshah, Iran.
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Suh KS, Choi EM, Lee YS, Kim YS. Protective effect of albiflorin against oxidative-stress-mediated toxicity in osteoblast-like MC3T3-E1 cells. Fitoterapia 2013; 89:33-41. [DOI: 10.1016/j.fitote.2013.05.016] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 05/16/2013] [Accepted: 05/19/2013] [Indexed: 01/10/2023]
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Lal A, Atamna W, Killilea DW, Suh JH, Ames BN. Lipoic acid and acetyl-carnitine reverse iron-induced oxidative stress in human fibroblasts. Redox Rep 2013; 13:2-10. [DOI: 10.1179/135100008x259150] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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Mansoor S, Gupta N, Luczy-Bachman G, Limb GA, Kuppermann BD, Kenney MC. Protective effects of lipoic acid on chrysene-induced toxicity on Müller cells in vitro. Mol Vis 2013; 19:25-38. [PMID: 23335848 PMCID: PMC3541045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Accepted: 01/03/2013] [Indexed: 11/13/2022] Open
Abstract
PURPOSE This study evaluates the toxic effects of chrysene (a component from cigarette smoke) on Müller cells (MIO-M1) in vitro and investigates whether the inhibitor lipoic acid can reverse the chrysene-induced toxic effects. METHODS MIO-M1 cells were exposed to varying concentrations of chrysene with or without lipoic acid. Cell viability was measured by a trypan blue dye exclusion assay. Caspase-3/7 activity was measured by a fluorochrome assay. Lactate dehydrogenase (LDH) release was quantified by an LDH assay. The production of reactive oxygen/nitrogen species (ROS/RNS) was measured with a 2',7'-dichlorodihydrofluorescein diacetate dye assay. Mitochondrial membrane potential (ΔΨm) was measured using the JC-1 assay. Intracellular ATP content was determined by the ATPLite kit. RESULTS MIO-M1 cells showed significantly decreased cell viability, increased caspase-3/7 activity, LDH release at the highest chrysene concentration, elevated ROS/RNS levels, decreased ΔΨm value, and decreased intracellular ATP content after exposure to 300, 500, and 1,000 µM chrysene compared with the control. Pretreatment with 80 µM lipoic acid reversed loss of cell viability in 500-µM-chrysene-treated cultures (24.7%, p<0.001). Similarly, pretreatment with 80 µM lipoic acid before chrysene resulted in decreased caspase-3/7 activities (75.7%, p<0.001), decreased ROS/RNS levels (80.02%, p<0.001), increased ΔΨm values (86%, p<0.001), and increased ATP levels (40.5%, p<0.001) compared to 500-µM-chrysene-treated cultures. CONCLUSIONS Chrysene, a component of cigarette smoke, can diminish cell viability in MIO-M1 cells in vitro by apoptosis at the lower concentrations of Chrysene (300 and 500 µM) and necrosis at the highest concentration. Moreover, mitochondrial function was particularly altered. However, lipoic acid can partially reverse the cytotoxic effect of chrysene. Lipoic acid administration may reduce or prevent Müller cell degeneration in retinal degenerative disorders.
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Affiliation(s)
- Saffar Mansoor
- From the Gavin Herbert Eye Institute, School of Medicine, University of California, Irvine, CA
| | - Navin Gupta
- From the Gavin Herbert Eye Institute, School of Medicine, University of California, Irvine, CA
| | - Georgia Luczy-Bachman
- Department of Pediatrics, Clinical Translational Science Center, University of California, Irvine, CA
| | - G. Astrid Limb
- Department of Ocular Biology and Therapeutics, UCL, Institute of Ophthalmology, London, United Kingdom
| | - Baruch D. Kuppermann
- From the Gavin Herbert Eye Institute, School of Medicine, University of California, Irvine, CA
| | - M. Cristina Kenney
- From the Gavin Herbert Eye Institute, School of Medicine, University of California, Irvine, CA
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Kusminski CM, Scherer PE. Mitochondrial dysfunction in white adipose tissue. Trends Endocrinol Metab 2012; 23:435-43. [PMID: 22784416 PMCID: PMC3430798 DOI: 10.1016/j.tem.2012.06.004] [Citation(s) in RCA: 257] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 06/06/2012] [Accepted: 06/11/2012] [Indexed: 12/14/2022]
Abstract
Although mitochondria in brown adipose tissue and their role in non-shivering thermogenesis have been widely studied, we have only a limited understanding of the relevance of mitochondria in white adipose tissue (WAT) for cellular homeostasis of the adipocyte and their impact upon systemic energy homeostasis. A better understanding of the regulatory role that white adipocyte mitochondria play in the regulation of whole-body physiology becomes increasingly important. WAT mitochondrial biogenesis can effectively be induced pharmacologically using a number of agents, including PPARγ agonists. Through their ability to influence key biochemical processes central to the adipocyte, such as fatty acid (FA) esterification and lipogenesis, as well as their impact upon the production and release of key adipokines, mitochondria play a crucial role in determining systemic insulin sensitivity.
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Affiliation(s)
| | - Philipp E. Scherer
- Touchstone Diabetes Center, Department of Internal Medicine, Dallas, Texas 75390-8549
- Department of Cell Biology, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-8549
- corresponding author: , Telephone: (214) 648-8715, Fax: (214) 648-8720
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Talebi A, Zavareh S, Kashani MH, Lashgarbluki T, Karimi I. The effect of alpha lipoic acid on the developmental competence of mouse isolated preantral follicles. J Assist Reprod Genet 2012; 29:175-83. [PMID: 22231012 PMCID: PMC3270132 DOI: 10.1007/s10815-011-9706-6] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 12/27/2011] [Indexed: 10/14/2022] Open
Abstract
PURPOSE This study was designed to investigate the effect of alpha-lipoic acid (ALA) on reactive oxygen species (ROS) production, total antioxidant capacity (TAC) and developmental competence of cultured pre-antral follicles derived from mouse ovarian tissue. METHODS Pre-antral follicles were isolated from immature mouse ovaries and were cultured in α- minimal essential medium supplemented with different concentrations (0, 50, 100, 250 and 500 uM) of ALA. Follicular growth, oocyte maturation and embryo development were evaluated. Separately, ROS and TAC were measured after 0, 24, 48, 72 and 96 h of culture with spectrofluorometery and ferric reducing/antioxidant power (FRAP) assay, respectively. RESULTS In the presence of 100 uM ALA, developmental rates of follicles, oocytes and embryos were significantly higher than other groups (p < 0.05). At 96 h after culture, a decrease in ROS and an increase in TAC were observed in ALA group compared to control group (p < 0.05). CONCLUSION ALA (100 uM) improves the in vitro development of follicles. This effect may be mediated by decreasing ROS concentration and increasing follicular TAC level during the culture period.
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Affiliation(s)
- Ali Talebi
- School of Biology, Damghan University, Damghan, Iran
| | - Saeed Zavareh
- School of Biology, Damghan University, Damghan, Iran
| | | | | | - Isaac Karimi
- School of Veterinary medicine, Razi University, Kermanshah, Iran
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Acetyl-L-carnitine and α-lipoic acid affect rotenone-induced damage in nigral dopaminergic neurons of rat brain, implication for Parkinson's disease therapy. Pharmacol Biochem Behav 2011; 100:347-60. [PMID: 21958946 DOI: 10.1016/j.pbb.2011.09.002] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 08/23/2011] [Accepted: 09/13/2011] [Indexed: 12/21/2022]
Abstract
Although the mechanisms of neurodegeneration in Parkinson's disease are not fully understood, mitochondrial dysfunction, oxidative stress and environmental toxins may be involved. The current research was directed to investigate the protective role of two bioenergetic antioxidants, acetyl-L-carnitine and α-lipoic acid, in rotenone-parkinsonian rats. Ninety six male rats were divided into five groups. Group I is the vehicle-injected group, group II is the disease control group and was injected with six doses of rotenone (1.5 mg/kg/48 h, s.c.). Groups III, IV and V received rotenone in addition to acetyl-L-carnitine (100 mg/kg/day, p.o.), α-lipoic acid (50 mg/kg/day, p.o.) or their combination, respectively. Results showed that rotenone-treated rats exhibited bradykinesia and motor impairment in the open-field and square bridge tests. In addition, ATP level was decreased whereas lipid peroxides and protein carbonyls increased in the striata of rotenone-treated rats as compared to vehicle-treated rats. Treatment with acetyl-L-carnitine or α-lipoic acid improved the motor performance and reduced the level of lipid peroxides in rat brains as compared to rotenone group. Further, ATP production was enhanced along with acetyl-L-carnitine treatments (p≤0.05). Taken together, our study reinforces the view that acetyl-L-carnitine and α-lipoic acid are promising candidates for neuroprotection in Parkinson's disease.
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López-Erauskin J, Fourcade S, Galino J, Ruiz M, Schlüter A, Naudi A, Jove M, Portero-Otin M, Pamplona R, Ferrer I, Pujol A. Antioxidants halt axonal degeneration in a mouse model of X-adrenoleukodystrophy. Ann Neurol 2011; 70:84-92. [PMID: 21786300 PMCID: PMC3229843 DOI: 10.1002/ana.22363] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE Axonal degeneration is a main contributor to disability in progressive neurodegenerative diseases in which oxidative stress is often identified as a pathogenic factor. We aim to demonstrate that antioxidants are able to improve axonal degeneration and locomotor deficits in a mouse model of X-adrenoleukodystrophy (X-ALD). METHODS X-ALD is a lethal disease caused by loss of function of the ABCD1 peroxisomal transporter of very long chain fatty acids (VLCFA). The mouse model for X-ALD exhibits a late onset neurological phenotype with locomotor disability and axonal degeneration in spinal cord resembling the most common phenotype of the disease, adrenomyeloneuropathy (X-AMN). Recently, we identified oxidative damage as an early event in life, and the excess of VLCFA as a generator of radical oxygen species (ROS) and oxidative damage to proteins in X-ALD. RESULTS Here, we prove the capability of the antioxidants N-acetyl-cysteine, α-lipoic acid, and α-tocopherol to scavenge VLCFA-dependent ROS generation in vitro. Furthermore, in a preclinical setting, the cocktail of the 3 compounds reversed: (1) oxidative stress and lesions to proteins, (2) immunohistological signs of axonal degeneration, and (3) locomotor impairment in bar cross and treadmill tests. INTERPRETATION We have established a direct link between oxidative stress and axonal damage in a mouse model of neurodegenerative disease. This conceptual proof of oxidative stress as a major disease-driving factor in X-AMN warrants translation into clinical trials for X-AMN, and invites assessment of antioxidant strategies in axonopathies in which oxidative damage might be a contributing factor.
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Affiliation(s)
- Jone López-Erauskin
- Neurometabolic Diseases Laboratory, The Bellvitge Institute of Biomedical Research, Hospitalet de Liobregat, Barcelona, Spain
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Prevention of Oxidative Stress-Induced Retinal Pigment Epithelial Cell Death by the PPARgamma Agonists, 15-Deoxy-Delta 12, 14-Prostaglandin J(2). PPAR Res 2011; 2008:720163. [PMID: 18382621 PMCID: PMC2276681 DOI: 10.1155/2008/720163] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2007] [Accepted: 12/15/2007] [Indexed: 11/18/2022] Open
Abstract
Cellular oxidative stress plays an important role in retinal pigment epithelial (RPE) cell death during aging and the development of age-related macular degeneration. Early reports indicate that during phagocytosis of rod outer segments, there is an increase of RPE oxidative stress and an upregulation of PPARγ mRNA in these cells. These studies suggest that activation of PPARγ may modulate cellular oxidative stress. This paper presents a brief review of recent studies that investigate RPE oxidative stress under various experimental conditions. This is followed by a detailed review on those reports that examine the protective effect of the natural PPARγ ligand, 15d-PGJ2, against RPE oxidative stress. This agent can upregulate glutathione and prevent oxidant-induced intracellular reactive oxygen species accumulation, mitochondrial depolarization, and apoptosis. The cytoprotective effect of this agent, however, is not shared by other PPARγ agonists. Nonetheless, this property of 15d-PGJ2 may be useful in future development of pharmacological tools against retinal diseases caused by oxidative stress.
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Rizzolo LJ, Peng S, Luo Y, Xiao W. Integration of tight junctions and claudins with the barrier functions of the retinal pigment epithelium. Prog Retin Eye Res 2011; 30:296-323. [PMID: 21704180 DOI: 10.1016/j.preteyeres.2011.06.002] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 06/01/2011] [Accepted: 06/06/2011] [Indexed: 02/02/2023]
Abstract
The retinal pigment epithelium (RPE) forms the outer blood-retinal barrier by regulating the movement of solutes between the fenestrated capillaries of the choroid and the photoreceptor layer of the retina. Blood-tissue barriers use various mechanisms to accomplish their tasks including membrane pumps, transporters, and channels, transcytosis, metabolic alteration of solutes in transit, and passive but selective diffusion. The last category includes tight junctions, which regulate transepithelial diffusion through the spaces between neighboring cells of the monolayer. Tight junctions are extraordinarily complex structures that are dynamically regulated. Claudins are a family of tight junctional proteins that lend tissue specificity and selectivity to tight junctions. This review discusses how the claudins and tight junctions of the RPE differ from other epithelia and how its functions are modulated by the neural retina. Studies of RPE-retinal interactions during development lend insight into this modulation. Notably, the characteristics of RPE junctions, such as claudin composition, vary among species, which suggests the physiology of the outer retina may also vary. Comparative studies of barrier functions among species should deepen our understanding of how homeostasis is maintained in the outer retina. Stem cells provide a way to extend these studies of RPE-retinal interactions to human RPE.
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Affiliation(s)
- Lawrence J Rizzolo
- Department of Surgery and Department of Ophthalmology and Visual Science, Yale University School of Medicine, PO Box 208062, New Haven, CT 06520-8062, USA.
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Vidro-Kotchan E, Yendluri BB, Le-Thai T, Tsin A. NBHA reduces acrolein-induced changes in ARPE-19 cells: possible involvement of TGFβ. Curr Eye Res 2011; 36:370-8. [PMID: 21309688 DOI: 10.3109/02713683.2010.549601] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Acrolein, a toxic, reactive aldehyde formed metabolically and environmentally, has been implicated in the damage to and dysfunction of the retinal pigment epithelium (RPE) that accompanies age-related macular degeneration (AMD). Our purpose was to investigate the potential of acrolein to influence the release of transforming growth factor beta-2 (TGFβ2) and vascular endothelial growth factor (VEGF), to assess the ability of N-benzylhydroxylamine (NBHA) to prevent the effect of acrolein on cytokine release and reduction of viable cells, and to explore the pathway by which acrolein might be causing the increase of VEGF. MATERIALS AND METHODS Confluent ARPE-19 cells were treated with acrolein and/or NBHA. They were also pretreated with SIS3, a specific inhibitor of SMAD 3, and ZM39923, a JAK3 inhibitor, before being treated with acrolein. Viable cells were counted; ELISA was used to measure the TGFβ2 and/or VEGF in the conditioned media. RESULTS Acrolein was shown to reduce the number of viable ARPE-19 cells and to upregulate the release of the proangiogenic cytokines TGFβ2 and VEGF. Co-treatment with 200 μM NBHA significantly reduced the effects of acrolein on viable cell number and TGFβ2 release. Pretreatment of the cells with SIS3 partially blocked the action of acrolein on decreased viable cell number and VEGF upregulation, suggesting that part of the effects of acrolein are mediated by the increased levels of TGFβ and its signaling. CONCLUSIONS Our results suggest that the action of acrolein on the reduction of viability and VEGF increase by ARPE-19 cells is partially mediated by TGFβ2. By reducing the effects of acrolein, NBHA and SIS3 could be potential pharmacological agents in the prevention and progression of acrolein-induced damage to the RPE that relates to AMD.
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Maminishkis A, Miller SS. Experimental models for study of retinal pigment epithelial physiology and pathophysiology. J Vis Exp 2010:2032. [PMID: 21085105 PMCID: PMC3144659 DOI: 10.3791/2032] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
We have developed a cell culture procedure that can produce large quantities of confluent monolayers of primary human fetal retinal pigment epithelium (hfRPE) cultures with morphological, physiological and genetic characteristics of native human RPE. These hfRPE cell cultures exhibit heavy pigmentation, and electron microscopy show extensive apical membrane microvilli. The junctional complexes were identified with immunofluorescence labeling of various tight junction proteins. Epithelial polarity and function of these easily reproducible primary cultures closely resemble previously studied mammalian models of native RPE, including human. These results were extended by the development of therapeutic interventions in several animal models of human eye disease. We have focused on strategies for the removal of abnormal fluid accumulation in the retina or subretinal space. The extracellular subretinal space separates the photoreceptor outer segments and the apical membrane of the RPE and is critical for maintenance of retinal attachments and a whole host of RPE/retina interactions.
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Fernandes AS, Gaspar J, Cabral MF, Rueff J, Castro M, Batinic-Haberle I, Costa J, Oliveira NG. Protective role of ortho-substituted Mn(III) N-alkylpyridylporphyrins against the oxidative injury induced by tert-butylhydroperoxide. Free Radic Res 2010; 44:430-40. [PMID: 20102317 DOI: 10.3109/10715760903555844] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The present work addresses the role of two ortho-substituted Mn(III) N-alkylpyridylporphyrins, alkyl being ethyl in MnTE-2-PyP(5+) and n-hexyl in MnTnHex-2-PyP(5+), on the protection against the oxidant tert-butylhydroperoxide (TBHP). Their protective role was studied in V79 cells using endpoints of cell viability (MTT and crystal violet assays), intracellular O(2)*- generation (dihydroethidium assay) and glutathione status (DTNB and monochlorobimane assays). MnPs per se did not show cytotoxicity (up to 25 microM, 24 h). The exposure to TBHP resulted in a significant decrease in cell viability and in an increase in the intracellular O(2)(*-) levels. Also, TBHP depleted total and reduced glutathione and increased GSSG. The two MnPs counteracted remarkably the effects of TBHP. Even at low concentrations, both MnPs were protective in terms of cell viability and abrogated the intracellular O(2)(*-) increase in a significant way. Also, they augmented markedly the total and reduced glutathione contents in TBHP-treated cells, highlighting the multiple mechanisms of protection of these SOD mimics, which at least in part may be ascribed to their electron-donating ability.
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Affiliation(s)
- Ana S Fernandes
- iMed.UL, Faculty of Pharmacy, University of Lisbon, Lisboa, Portugal
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Cagini C, Leontiadis A, Ricci MA, Bartolini A, Dragoni A, Pellegrino RM. Study of alpha-lipoic acid penetration in the human aqueous after topical administration. Clin Exp Ophthalmol 2010; 38:572-6. [DOI: 10.1111/j.1442-9071.2010.02319.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ames BN. Optimal micronutrients delay mitochondrial decay and age-associated diseases. Mech Ageing Dev 2010; 131:473-9. [PMID: 20420847 DOI: 10.1016/j.mad.2010.04.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Revised: 04/06/2010] [Accepted: 04/16/2010] [Indexed: 01/18/2023]
Abstract
Three of our research efforts are reviewed, which suggest that optimizing metabolism will delay aging and the diseases of aging in humans. (1) Research on delay of the mitochondrial decay of aging by supplementing rats with lipoic acid and acetyl carnitine. (2) The triage theory, which posits that modest micronutrient deficiencies (common in much of the population) accelerate molecular aging, including mitochondrial decay, and supportive evidence, including an analysis in depth of vitamin K, that suggests the importance of achieving optimal micronutrient intake for longevity. (3) The finding that decreased enzyme binding constants (increased Km) for coenzymes (or substrates) can result from protein deformation and loss of function due to loss of membrane fluidity with age, or to polymorphisms or mutation. The loss of enzyme function can be ameliorated by high doses of a B vitamin, which raises coenzyme levels, and indicates the importance of understanding the effects of age, or polymorphisms, on micronutrient requirements.
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Affiliation(s)
- Bruce N Ames
- Children's Hospital Oakland Research Institute, Nutrition and Metabolism Center, Oakland, CA 94609, USA.
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Abstract
By its action on rhodopsin, light triggers the well-known visual transduction cascade, but can also induce cell damage and death through phototoxic mechanisms - a comprehensive understanding of which is still elusive despite more than 40 years of research. Herein, we integrate recent experimental findings to address several hypotheses of retinal light damage, premised in part on the close anatomical and metabolic relationships between the photoreceptors and the retinal pigment epithelium. We begin by reviewing the salient features of light damage, recently joined by evidence for retinal remodeling which has implications for the prognosis of recovery of function in retinal degenerations. We then consider select factors that influence the progression of the damage process and the extent of visual cell loss. Traditional, genetically modified, and emerging animal models are discussed, with particular emphasis on cone visual cells. Exogenous and endogenous retinal protective factors are explored, with implications for light damage mechanisms and some suggested avenues for future research. Synergies are known to exist between our long term light environment and photoreceptor cell death in retinal disease. Understanding the molecular mechanisms of light damage in a variety of animal models can provide valuable insights into the effects of light in clinical disorders and may form the basis of future therapies to prevent or delay visual cell loss.
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Li R, Maminishkis A, Banzon T, Wan Q, Jalickee S, Chen S, Miller SS. IFN{gamma} regulates retinal pigment epithelial fluid transport. Am J Physiol Cell Physiol 2009; 297:C1452-65. [PMID: 19794146 PMCID: PMC2793058 DOI: 10.1152/ajpcell.00255.2009] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Accepted: 09/25/2009] [Indexed: 12/14/2022]
Abstract
The present experiments show that IFNgamma receptors are mainly localized to the basolateral membrane of human retinal pigment epithelium (RPE). Activation of these receptors in primary cultures of human fetal RPE inhibited cell proliferation and migration, decreased RPE mitochondrial membrane potential, altered transepithelial potential and resistance, and significantly increased transepithelial fluid absorption. These effects are mediated through JAK-STAT and p38 MAPK signaling pathways. Second messenger signaling through cAMP-PKA pathway- and interferon regulatory factor-1-dependent production of nitric oxide/cGMP stimulated the CFTR at the basolateral membrane and increased transepithelial fluid absorption. In vivo experiments using a rat model of retinal reattachment showed that IFNgamma applied to the anterior surface of the eye can remove extra fluid deposited in the extracellular or subretinal space between the retinal photoreceptors and RPE. Removal of this extra fluid was blocked by a combination of PKA and JAK-STAT pathway inhibitors injected into the subretinal space. These results demonstrate a protective role for IFNgamma in regulating retinal hydration across the outer blood-retinal barrier in inflammatory disease processes and provide the basis for possible therapeutic interventions.
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Affiliation(s)
- Rong Li
- NIH, Bethesda, MD 20892-2510, USA
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Ripcke J, Zarse K, Ristow M, Birringer M. Small-Molecule Targeting of the Mitochondrial Compartment with an Endogenously Cleaved Reversible Tag. Chembiochem 2009; 10:1689-96. [DOI: 10.1002/cbic.200900159] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Wang ZY, Shen LJ, Tu L, Hu DN, Liu GY, Zhou ZL, Lin Y, Chen LH, Qu J. Erythropoietin protects retinal pigment epithelial cells from oxidative damage. Free Radic Biol Med 2009; 46:1032-41. [PMID: 19136057 DOI: 10.1016/j.freeradbiomed.2008.11.027] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 10/10/2008] [Accepted: 11/18/2008] [Indexed: 12/17/2022]
Abstract
Oxidative damage from reactive oxygen species (ROS) has been implicated in many diseases, including age-related macular degeneration, in which the retinal pigment epithelium (RPE) is considered a primary target. The aim of this study was to determine whether erythropoietin (EPO) protects cultured human RPE cells against oxidative damage and to identify the pathways that may mediate protection. EPO (1 IU/ml) significantly increased the viability of oxidant-treated RPE cells, decreased the release of the inflammatory cytokines tumor necrosis factor-alpha and interleukin-1beta, recovered the RPE cells' barrier integrity disrupted by oxidative stress, prevented oxidant-induced cell DNA fragmentation and membrane phosphatidylserine exposure, and also reduced the levels of oxidant-induced intracellular ROS and restored cellular antioxidant potential, total antioxidant capacity, glutathione peroxidase, and superoxide dismutase and decreased malondialdehyde, the end product of lipid peroxidation. EPO inhibited caspase-3-like activity. Protection by EPO was partly dependent on the activation of Akt1 and the maintenance of the mitochondrial membrane potential. No enhanced or synergistic protection was observed during application of Z-DEVD-FMK (caspase-3 inhibitor) combined with EPO compared with cultures exposed to EPO and H(2)O(2) alone. Together, these results suggest that EPO could protect against oxidative injury-induced cell death and mitochondrial dysfunction in RPE cells through modulation of Akt1 phosphorylation, mitochondrial membrane potential, and cysteine protease activity.
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Affiliation(s)
- Zhao-yang Wang
- The School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical College, Wenzhou, Zhejiang, China
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Qin S, Rodrigues GA. Progress and perspectives on the role of RPE cell inflammatory responses in the development of age-related macular degeneration. J Inflamm Res 2008; 1:49-65. [PMID: 22096347 PMCID: PMC3218720 DOI: 10.2147/jir.s4354] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Age-related macular degeneration (AMD) is the leading cause of blindness in developed countries. The etiology of AMD remains poorly understood and no treatment is currently available for the atrophic form of AMD. Atrophic AMD has been proposed to involve abnormalities of the retinal pigment epithelium (RPE), which lies beneath the photoreceptor cells and normally provides critical metabolic support to these light-sensing cells. Cumulative oxidative stress and local inflammation are thought to represent pathological processes involved in the etiology of atrophic AMD. Studies of tissue culture and animal models reveal that oxidative stress-induced injury to the RPE results in a chronic inflammatory response, drusen formation, and RPE atrophy. RPE degeneration in turn causes a progressive degeneration of photoreceptors, leading to the irreversible loss of vision. This review describes some of the potential major molecular and cellular events contributing to RPE death and inflammatory responses. In addition, potential target areas for therapeutic intervention will be discussed and new experimental therapeutic strategies for atrophic AMD will be presented.
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Affiliation(s)
- Suofu Qin
- Retinal Disease Research, Department of Biological Sciences, Allergan, Inc., Irvine, CA, USA
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Long J, Gao F, Tong L, Cotman CW, Ames BN, Liu J. Mitochondrial decay in the brains of old rats: ameliorating effect of alpha-lipoic acid and acetyl-L-carnitine. Neurochem Res 2008; 34:755-63. [PMID: 18846423 DOI: 10.1007/s11064-008-9850-2] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2008] [Accepted: 09/03/2008] [Indexed: 11/30/2022]
Abstract
To investigate the mitochondrial decay and oxidative damage resulting from aging, the activities/kinetics of the mitochondrial complexes were examined in the brains of young and old rats as well as in old rats fed R-alpha-lipoic acid plus acetyl-L-carnitine (LA/ALC). The brain mitochondria of old rats, compared with young rats, had significantly decreased endogenous antioxidants and superoxide dismutase activity; more oxidative damage to lipids and proteins; and decreased activities of complex I, IV and V. Complex I showed a decrease in binding affinity (increase in K(m)) for substrates. Feeding LA/ALC to old rats partially restored age-associated mitochondrial dysfunction to the levels of the young rats. These results indicate that oxidative mitochondrial decay plays an important role in brain aging and that a combination of nutrients targeting mitochondria, such as LA/ALC, could ameliorate mitochondrial decay through preventing mitochondrial oxidative damage.
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Affiliation(s)
- Jiangang Long
- Institute for Brain Aging and Dementia, University of California, Irvine, CA 92697-4540, USA
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