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Basyal D, Lee S, Kim HJ. Antioxidants and Mechanistic Insights for Managing Dry Age-Related Macular Degeneration. Antioxidants (Basel) 2024; 13:568. [PMID: 38790673 PMCID: PMC11117704 DOI: 10.3390/antiox13050568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 04/26/2024] [Accepted: 05/02/2024] [Indexed: 05/26/2024] Open
Abstract
Age-related macular degeneration (AMD) severely affects central vision due to progressive macular degeneration and its staggering prevalence is rising globally, especially in the elderly population above 55 years. Increased oxidative stress with aging is considered an important contributor to AMD pathogenesis despite multifaceted risk factors including genetic predisposition and environmental agents. Wet AMD can be managed with routine intra-vitreal injection of angiogenesis inhibitors, but no satisfactory medicine has been approved for the successful management of the dry form. The toxic carbonyls due to photo-oxidative degradation of accumulated bisretinoids within lysosomes initiate a series of events including protein adduct formation, impaired autophagy flux, complement activation, and chronic inflammation, which is implicated in dry AMD. Therapy based on antioxidants has been extensively studied for its promising effect in reducing the impact of oxidative stress. This paper reviews the dry AMD pathogenesis, delineates the effectiveness of dietary and nutrition supplements in clinical studies, and explores pre-clinical studies of antioxidant molecules, extracts, and formulations with their mechanistic insights.
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Affiliation(s)
| | | | - Hye Jin Kim
- College of Pharmacy, Keimyung University, Dauge 42601, Republic of Korea
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2
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Schustak J, Han H, Bond K, Huang Q, Saint-Geniez M, Bao Y. Phenotypic high-throughput screening identifies aryl hydrocarbon receptor agonism as common inhibitor of toxin-induced retinal pigment epithelium cell death. PLoS One 2024; 19:e0301239. [PMID: 38635505 PMCID: PMC11025755 DOI: 10.1371/journal.pone.0301239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 03/12/2024] [Indexed: 04/20/2024] Open
Abstract
The retinal pigment epithelium (RPE) is essential to maintain retinal function, and RPE cell death represents a key pathogenic stage in the progression of several blinding ocular diseases, including age-related macular degeneration (AMD). To identify pathways and compounds able to prevent RPE cell death, we developed a phenotypic screening pipeline utilizing a compound library and high-throughput screening compatible assays on the human RPE cell line, ARPE-19, in response to different disease relevant cytotoxic stimuli. We show that the metabolic by-product of the visual cycle all-trans-retinal (atRAL) induces RPE apoptosis, while the lipid peroxidation by-product 4-hydroxynonenal (4-HNE) promotes necrotic cell death. Using these distinct stimuli for screening, we identified agonists of the aryl hydrocarbon receptor (AhR) as a consensus target able to prevent both atRAL mediated apoptosis and 4-HNE-induced necrotic cell death. This works serves as a framework for future studies dedicated to screening for inhibitors of cell death, as well as support for the discussion of AhR agonism in RPE pathology.
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Affiliation(s)
- Joshua Schustak
- Department of Ophthalmology, BioMedical Research, Novartis, Cambridge, Massachusetts, United States of America
| | - Hongwei Han
- Department of Ophthalmology, BioMedical Research, Novartis, Cambridge, Massachusetts, United States of America
| | - Kyle Bond
- Department of Ophthalmology, BioMedical Research, Novartis, Cambridge, Massachusetts, United States of America
| | - Qian Huang
- Department of Ophthalmology, BioMedical Research, Novartis, Cambridge, Massachusetts, United States of America
| | - Magali Saint-Geniez
- Department of Ophthalmology, BioMedical Research, Novartis, Cambridge, Massachusetts, United States of America
| | - Yi Bao
- Department of Ophthalmology, BioMedical Research, Novartis, Cambridge, Massachusetts, United States of America
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Park C, Cha HJ, Hwangbo H, Ji SY, Kim DH, Kim MY, Bang E, Hong SH, Kim SO, Jeong SJ, Lee H, Moon SK, Shim JH, Kim GY, Cho S, Choi YH. Phloroglucinol Inhibits Oxidative-Stress-Induced Cytotoxicity in C2C12 Murine Myoblasts through Nrf-2-Mediated Activation of HO-1. Int J Mol Sci 2023; 24:4637. [PMID: 36902068 PMCID: PMC10003575 DOI: 10.3390/ijms24054637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 03/04/2023] Open
Abstract
Phloroglucinol is a class of polyphenolic compounds containing aromatic phenyl rings and is known to have various pharmacological activities. Recently, we reported that this compound isolated from Ecklonia cava, a brown alga belonging to the family Laminariaceae, has potent antioxidant activity in human dermal keratinocytes. In this study, we evaluated whether phloroglucinol could protect against hydrogen peroxide (H2O2)-induced oxidative damage in murine-derived C2C12 myoblasts. Our results revealed that phloroglucinol suppressed H2O2-induced cytotoxicity and DNA damage while blocking the production of reactive oxygen species. We also found that phloroglucinol protected cells from the induction of apoptosis associated with mitochondrial impairment caused by H2O2 treatment. Furthermore, phloroglucinol enhanced the phosphorylation of nuclear factor-erythroid-2 related factor 2 (Nrf2) as well as the expression and activity of heme oxygenase-1 (HO-1). However, such anti-apoptotic and cytoprotective effects of phloroglucinol were greatly abolished by the HO-1 inhibitor, suggesting that phloroglucinol could increase the Nrf2-mediated activity of HO-1 to protect C2C12 myoblasts from oxidative stress. Taken together, our results indicate that phloroglucinol has a strong antioxidant activity as an Nrf2 activator and may have therapeutic benefits for oxidative-stress-mediated muscle disease.
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Affiliation(s)
- Cheol Park
- Division of Basic Sciences, College of Liberal Studies, Dong-eui University, Busan 47340, Republic of Korea
| | - Hee-Jae Cha
- Department of Parasitology and Genetics, College of Medicine, Kosin University, Busan 49267, Republic of Korea
| | - Hyun Hwangbo
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
| | - Seon Yeong Ji
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
| | - Da Hye Kim
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
| | - Min Yeong Kim
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
| | - EunJin Bang
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
| | - Su Hyun Hong
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
| | - Sung Ok Kim
- Department of Food and Nutrition, College of Life and Health, Kyungsung University, Busan 48434, Republic of Korea
| | - Soon-Jeong Jeong
- Department of Dental Hygiene & Institute of Basic Science for Well-Aging, Youngsan University, Yangsan 50510, Republic of Korea
| | - Hyesook Lee
- Department of Convergence Medicine, Pusan National University School of Medicine, Yangsan 50612, Republic of Korea
| | - Sung-Kwon Moon
- Department of Food and Nutrition, College of Biotechnology & Natural Resource, Chung-Ang University, Ansung 17546, Republic of Korea
| | - Jung-Hyun Shim
- Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan 58554, Republic of Korea
| | - Gi-Young Kim
- Department of Marine Life Science, College of Ocean Sciences, Jeju National University, Jeju 63243, Republic of Korea
| | - Suengmok Cho
- Department of Food Science and Technology, Institute of Food Science, Pukyong National University, Busan 48513, Republic of Korea
| | - Yung Hyun Choi
- Anti-Aging Research Center, Dong-eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea
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4
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Park C, Cha HJ, Kim MY, Bang E, Moon SK, Yun SJ, Kim WJ, Noh JS, Kim GY, Cho S, Lee H, Choi YH. Phloroglucinol Attenuates DNA Damage and Apoptosis Induced by Oxidative Stress in Human Retinal Pigment Epithelium ARPE-19 Cells by Blocking the Production of Mitochondrial ROS. Antioxidants (Basel) 2022; 11:antiox11122353. [PMID: 36552561 PMCID: PMC9774705 DOI: 10.3390/antiox11122353] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/19/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022] Open
Abstract
Phloroglucinol, a phenolic compound, is known to possess a potent antioxidant ability. However, its role in retinal cells susceptible to oxidative stress has not been well elucidated yet. Thus, the objective of this study was to evaluate whether phloroglucinol could protect against oxidative damage in cultured human retinal pigment epithelium ARPE-19 cells. For this purpose, ARPE-19 cells were stimula ted with hydrogen peroxide (H2O2) to mimic oxidative stress. Cell viability, cytotoxicity, apoptosis, reactive oxygen species (ROS) generation, mitochondrial function, DNA damage, and autophagy were then assessed. Our results revealed that phloroglucinol ameliorated cell viability, cytotoxicity, and DNA damage in H2O2-exposued ARPE-19 cells and blocked production of ROS. Phloroglucinol also counteracted H2O2-induced apoptosis by reducing Bax/Bcl-2 ratio, blocking activation of caspase-3, and inhibiting degradation of poly (ADP-ribose) polymerase. H2O2 caused mitochondrial impairment and increased expression levels of mitophagy markers such as PINK1and PARKIN known to be associated with mitochondrial ROS (mtROS) generation and cytosolic release of cytochrome c. However, these changes were significantly attenuated by phloroglucinol. Mito-TEMPO, a selective mitochondrial antioxidant, further enhanced the protective effect of phloroglucinol against dysfunctional mitochondria. Furthermore, H2O2 induced autophagy, but not when ARPE-19 cells were pretreated with phloroglucinol, meaning that autophagy by H2O2 contributed to the pro-survival mechanism and that phloroglucinol protected ARPE-19 cells from apoptosis by blocking autophagy. Taken together, these results suggest that phloroglucinol can inhibit oxidative stress-induced ARPE-19 cell damage and dysfunction by protecting DNA damage, autophagy, and subsequent apoptosis through mitigation of mtROS generation. Thus, phloroglucinol might have therapeutic potential to prevent oxidative stress-mediated damage in RPE cells.
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Affiliation(s)
- Cheol Park
- Division of Basic Sciences, College of Liberal Studies, Dong-Eui University, Busan 47340, Republic of Korea
| | - Hee-Jae Cha
- Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Republic of Korea
| | - Min Yeong Kim
- Anti-Aging Research Center, Dong-Eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-Eui University, Busan 47227, Republic of Korea
| | - EunJin Bang
- Anti-Aging Research Center, Dong-Eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-Eui University, Busan 47227, Republic of Korea
| | - Sung-Kwon Moon
- Department of Food and Nutrition, Chung-Ang University, Ansung 17546, Republic of Korea
| | - Seok Joong Yun
- Department of Urology, College of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Wun-Jae Kim
- Department of Urology, College of Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Jeong Sook Noh
- Department of Food Science & Nutrition, Tongmyong University, Busan 48520, Republic of Korea
| | - Gi-Young Kim
- Department of Marine Life Science, Jeju National University, Jeju 63243, Republic of Korea
| | - Suengmok Cho
- Department of Food Science and Technology, Institute of Food Science, Pukyong National University, Busan 48513, Republic of Korea
| | - Hyesook Lee
- Department of Convergence Medicine, Pusan National University School of Medicine, Yangsan 50612, Republic of Korea
- Correspondence: (H.L.); (Y.H.C.); Tel.: +82-51-890-8129 (H.L.); +82-51-890-3319 (Y.H.C.)
| | - Yung Hyun Choi
- Anti-Aging Research Center, Dong-Eui University, Busan 47340, Republic of Korea
- Department of Biochemistry, College of Korean Medicine, Dong-Eui University, Busan 47227, Republic of Korea
- Correspondence: (H.L.); (Y.H.C.); Tel.: +82-51-890-8129 (H.L.); +82-51-890-3319 (Y.H.C.)
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5
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Vincent M, Simon L, Brabet P, Legrand P, Dorandeu C, Him JLK, Durand T, Crauste C, Begu S. Formulation and Evaluation of SNEDDS Loaded with Original Lipophenol for the Oral Route to Prevent Dry AMD and Stragardt’s Disease. Pharmaceutics 2022; 14:pharmaceutics14051029. [PMID: 35631617 PMCID: PMC9147958 DOI: 10.3390/pharmaceutics14051029] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/05/2022] [Accepted: 05/06/2022] [Indexed: 11/16/2022] Open
Abstract
Dry age-related macular degeneration (Dry AMD) and Stargardt’s disease (STGD1) are common eye diseases, characterized by oxidative and carbonyl stress (COS)-inducing photoreceptor degeneration and vision loss. Previous studies have demonstrated the protective effect of photoreceptors after the intravenous administration of a new lipophenol drug, phloroglucinol-isopropyl-DHA (IP-DHA). In this study, we developed an oral formulation of IP-DHA (BCS Class IV) relying on a self-nanoemulsifying drug delivery system (SNEDDS). SNEDDS, composed of Phosal® 53 MCT, Labrasol®, and Transcutol HP® at a ratio of 25/60/15 (w/w/w), led to a homogeneous nanoemulsion (NE) with a mean size of 53.5 ± 4.5 nm. The loading of IP-DHA in SNEDDS (SNEDDS-IP-DHA) was successful, with a percentage of IP-DHA of 99.7% in nanoemulsions. The in vivo study of the therapeutic potency of SNEDDS-IP-DHA after oral administration on mice demonstrated photoreceptor protection after the induction of retinal degeneration with acute light stress (73–80%) or chronic light stress (52–69%). Thus, SNEDDS formulation proved to increase the solubility of IP-DHA, improving its stability in intestinal media and allowing its passage through the intestinal barrier after oral force-fed administration, while maintaining its biological activity. Therefore, SNEDDS-IP-DHA is a promising future preventive treatment for dry AMD and STGD1.
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Affiliation(s)
- Maxime Vincent
- ICGM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France; (M.V.); (L.S.); (P.L.); (C.D.)
| | - Laurianne Simon
- ICGM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France; (M.V.); (L.S.); (P.L.); (C.D.)
| | - Philippe Brabet
- Institut des Neurosciences de Montpellier, INSERM U1051, 34000 Montpellier, France
- Correspondence: (P.B.); (C.C.); (S.B.)
| | - Philippe Legrand
- ICGM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France; (M.V.); (L.S.); (P.L.); (C.D.)
| | - Christophe Dorandeu
- ICGM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France; (M.V.); (L.S.); (P.L.); (C.D.)
| | - Josephine Lai Kee Him
- Centre de Biochimie Structurale, CNRS UMR 5048, INSERM U1054, 34000 Montpellier, France;
| | - Thierry Durand
- IBMM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France;
| | - Céline Crauste
- IBMM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France;
- Correspondence: (P.B.); (C.C.); (S.B.)
| | - Sylvie Begu
- ICGM, Univ Montpellier, CNRS, ENSCM, 34000 Montpellier, France; (M.V.); (L.S.); (P.L.); (C.D.)
- Correspondence: (P.B.); (C.C.); (S.B.)
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6
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Quero J, Mármol I, Cerrada E, Rodríguez-Yoldi MJ. Insight into the potential application of polyphenol-rich dietary intervention in degenerative disease management. Food Funct 2021; 11:2805-2825. [PMID: 32134090 DOI: 10.1039/d0fo00216j] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In recent times, a great number of plants have been studied in order to identify new components with nutraceutical properties, among which are polyphenols. Dietary polyphenols represent a large group of bioactive molecules widely found in the food of plant origin and they have been found able to prevent the onset and progression of degenerative diseases, and to reduce and control their symptoms. These health protective effects have been mainly related to their antioxidant and anti-inflammatory properties. However, it must be considered that the application of isolated polyphenols as nutraceuticals is quite limited due to their poor systemic distribution and relative bioavailability. The present review highlights the potential effect of dietary intervention with polyphenol-rich food and plant extracts in patients with cancer, diabetes and neurodegenerative, autoimmune, cardiovascular and ophthalmic diseases, as well as the possible molecular mechanisms of action suggested in numerous studies with animal models.
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Affiliation(s)
- Javier Quero
- Departamento de Farmacología y Fisiología. Unidad de Fisiología, Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, CIBERobn (Carlos III), IIS Aragón, IA2, Spain.
| | - Inés Mármol
- Departamento de Farmacología y Fisiología. Unidad de Fisiología, Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, CIBERobn (Carlos III), IIS Aragón, IA2, Spain.
| | - Elena Cerrada
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
| | - María Jesús Rodríguez-Yoldi
- Departamento de Farmacología y Fisiología. Unidad de Fisiología, Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, CIBERobn (Carlos III), IIS Aragón, IA2, Spain.
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7
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Moine E, Boukhallat M, Cia D, Jacquemot N, Guillou L, Durand T, Vercauteren J, Brabet P, Crauste C. New lipophenols prevent carbonyl and oxidative stresses involved in macular degeneration. Free Radic Biol Med 2021; 162:367-382. [PMID: 33129975 DOI: 10.1016/j.freeradbiomed.2020.10.316] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 12/17/2022]
Abstract
Dry age-related macular degeneration and Stargardt disease undergo a known toxic mechanism caused by carbonyl and oxidative stresses (COS). This is responsible for accumulation in the retinal pigment epithelium (RPE) of A2E, a main toxic pyridinium bis-retinoid lipofuscin component. Previous studies have shown that carbonyl stress in retinal cells could be reduced by an alkyl-phloroglucinol-DHA conjugate (lipophenol). Here, we performed a rational design of different families of lipophenols to conserve anti-carbonyl stress activities and improve antioxidant properties. Five synthetic pathways leading to alkyl-(poly)phenol derivatives, with phloroglucinol, resveratrol, catechin and quercetin as the main backbone, linked to poly-unsaturated fatty acid, are presented. These lipophenols were evaluated in ARPE-19 cell line for their anti-COS properties and a structure-activity relationship study is proposed. Protection of ARPE-19 cells against A2E toxicity was assessed for the four best candidates. Finally, interesting anti-COS properties of the most promising quercetin lipophenol were confirmed in primary RPE cells.
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Affiliation(s)
- Espérance Moine
- Institut des Biomolécules Max Mousseron (IBMM), Université de Montpellier, CNRS, ENSCM, Montpellier, 34093, France.
| | - Manel Boukhallat
- Institut des Biomolécules Max Mousseron (IBMM), Université de Montpellier, CNRS, ENSCM, Montpellier, 34093, France
| | - David Cia
- Laboratoire de Biophysique Neurosensorielle, UMR INSERM 1107, Facultés de Médecine et de Pharmacie, Clermont-Ferrand, 63000, France
| | - Nathalie Jacquemot
- Laboratoire de Biophysique Neurosensorielle, UMR INSERM 1107, Facultés de Médecine et de Pharmacie, Clermont-Ferrand, 63000, France
| | - Laurent Guillou
- Institut des Neurosciences de Montpellier, INSERM U1051, Université de Montpellier, Montpellier, 34091, France
| | - Thierry Durand
- Institut des Biomolécules Max Mousseron (IBMM), Université de Montpellier, CNRS, ENSCM, Montpellier, 34093, France
| | - Joseph Vercauteren
- Institut des Biomolécules Max Mousseron (IBMM), Université de Montpellier, CNRS, ENSCM, Montpellier, 34093, France
| | - Philippe Brabet
- Institut des Neurosciences de Montpellier, INSERM U1051, Université de Montpellier, Montpellier, 34091, France
| | - Céline Crauste
- Institut des Biomolécules Max Mousseron (IBMM), Université de Montpellier, CNRS, ENSCM, Montpellier, 34093, France.
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Taveau N, Cubizolle A, Guillou L, Pinquier N, Moine E, Cia D, Kalatzis V, Vercauteren J, Durand T, Crauste C, Brabet P. Preclinical pharmacology of a lipophenol in a mouse model of light-induced retinopathy. Exp Mol Med 2020; 52:1090-1101. [PMID: 32641711 PMCID: PMC8080701 DOI: 10.1038/s12276-020-0460-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 04/18/2020] [Accepted: 04/21/2020] [Indexed: 12/17/2022] Open
Abstract
Environmental light has deleterious effects on the outer retina in human retinopathies, such as ABCA4-related Stargardt’s disease and dry age-related macular degeneration. These effects involve carbonyl and oxidative stress, which contribute to retinal cell death and vision loss. Here, we used an albino Abca4−/− mouse model, the outer retina of which shows susceptibility to acute photodamage, to test the protective efficacy of a new polyunsaturated fatty acid lipophenol derivative. Anatomical and functional analyses demonstrated that a single intravenous injection of isopropyl-phloroglucinol-DHA, termed IP-DHA, dose-dependently decreased light-induced photoreceptor degeneration and preserved visual sensitivity. This protective effect persisted for 3 months. IP-DHA did not affect the kinetics of the visual cycle in vivo or the activity of the RPE65 isomerase in vitro. Moreover, IP-DHA administered by oral gavage showed significant protection of photoreceptors against acute light damage. In conclusion, short-term tests in Abca4-deficient mice, following single-dose administration and light exposure, identify IP-DHA as a therapeutic agent for the prevention of retinal degeneration. Treating retinal damage in both aging and young patients might now be easier, thanks to treatment with a lipophenol, an omega-3 fatty acid linked to an antioxidant. The retina is the part of the eye that senses light, aided by light-sensitive pigments. However, these light-sensitive pigments can be converted by light to toxic byproducts, and in some individuals, these toxic byproducts can accumulate, damaging the retina and leading to vision loss. Philippe Brabet at the Montpellier Institute of Neuroscience in France and co-workers found that lipophenol treatment protected retinal cells from damage in a mouse model of retinal disease, and that a single dose has been effective in preserving vision. These results may help in finding new treatments for retinal diseases such as Stargardt disease and age-related macular degeneration.
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Affiliation(s)
- Nicolas Taveau
- Institut des Neurosciences de Montpellier, INSERM U1051, F-34091, Montpellier, France.,Université de Montpellier, F-34091, Montpellier, France
| | - Aurélie Cubizolle
- Institut des Neurosciences de Montpellier, INSERM U1051, F-34091, Montpellier, France.,Université de Montpellier, F-34091, Montpellier, France
| | - Laurent Guillou
- Institut des Neurosciences de Montpellier, INSERM U1051, F-34091, Montpellier, France.,Université de Montpellier, F-34091, Montpellier, France
| | - Nicolas Pinquier
- Institut des Neurosciences de Montpellier, INSERM U1051, F-34091, Montpellier, France
| | - Espérance Moine
- Institut des Biomolecules Max Mousseron (IBMM), UMR 5247 - Université de Montpellier, CNRS, ENSCM, F-34095, Montpellier, France
| | - David Cia
- Laboratoire de Biophysique Neurosensorielle, UMR INSERM 1107, Facultés de Médecine et de Pharmacie, F-63001, Clermont-Ferrand, France
| | - Vasiliki Kalatzis
- Institut des Neurosciences de Montpellier, INSERM U1051, F-34091, Montpellier, France.,Université de Montpellier, F-34091, Montpellier, France
| | - Joseph Vercauteren
- Institut des Biomolecules Max Mousseron (IBMM), UMR 5247 - Université de Montpellier, CNRS, ENSCM, F-34095, Montpellier, France
| | - Thierry Durand
- Institut des Biomolecules Max Mousseron (IBMM), UMR 5247 - Université de Montpellier, CNRS, ENSCM, F-34095, Montpellier, France
| | - Céline Crauste
- Institut des Biomolecules Max Mousseron (IBMM), UMR 5247 - Université de Montpellier, CNRS, ENSCM, F-34095, Montpellier, France
| | - Philippe Brabet
- Institut des Neurosciences de Montpellier, INSERM U1051, F-34091, Montpellier, France. .,Université de Montpellier, F-34091, Montpellier, France.
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9
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Cubizolle A, Cia D, Moine E, Jacquemot N, Guillou L, Rosell M, Angebault-Prouteau C, Lenaers G, Meunier I, Vercauteren J, Durand T, Crauste C, Brabet P. Isopropyl-phloroglucinol-DHA protects outer retinal cells against lethal dose of all-trans-retinal. J Cell Mol Med 2020; 24:5057-5069. [PMID: 32212312 PMCID: PMC7205824 DOI: 10.1111/jcmm.15135] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 12/19/2019] [Accepted: 01/27/2020] [Indexed: 12/18/2022] Open
Abstract
All‐trans‐retinal (atRAL) is a highly reactive carbonyl specie, known for its reactivity on cellular phosphatidylethanolamine in photoreceptor. It is generated by photoisomerization of 11‐cis‐retinal chromophore linked to opsin by the Schiff's base reaction. In ABCA4‐associated autosomal recessive Stargardt macular dystrophy, atRAL results in carbonyl and oxidative stress, which leads to bisretinoid A2E, accumulation in the retinal pigment epithelium (RPE). This A2E‐accumulation presents as lipofuscin fluorescent pigment, and its photooxidation causes subsequent damage. Here we describe protection against a lethal dose of atRAL in both photoreceptors and RPE in primary cultures by a lipidic polyphenol derivative, an isopropyl‐phloroglucinol linked to DHA, referred to as IP‐DHA. Next, we addressed the cellular and molecular defence mechanisms in commonly used human ARPE‐19 cells. We determined that both polyunsaturated fatty acid and isopropyl substituents bond to phloroglucinol are essential to confer the highest protection. IP‐DHA responds rapidly against the toxicity of atRAL and its protective effect persists. This healthy effect of IP‐DHA applies to the mitochondrial respiration. IP‐DHA also rescues RPE cells subjected to the toxic effects of A2E after blue light exposure. Together, our findings suggest that the beneficial role of IP‐DHA in retinal cells involves both anti‐carbonyl and anti‐oxidative capacities.
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Affiliation(s)
- Aurélie Cubizolle
- INSERM U1051, Institut des Neurosciences de Montpellier, Montpellier, France.,Université Montpellier, Montpellier, France
| | - David Cia
- UMR INSERM 1107, Laboratoire de Biophysique Neurosensorielle, Facultés de Médecine et de Pharmacie, Clermont-Ferrand, France
| | - Espérance Moine
- UMR5247-CNRS-UM ENSCM Faculté de Pharmacie, Institut des Biomolecules Max Mousseron (IBMM), Montpellier, France
| | - Nathalie Jacquemot
- UMR INSERM 1107, Laboratoire de Biophysique Neurosensorielle, Facultés de Médecine et de Pharmacie, Clermont-Ferrand, France
| | - Laurent Guillou
- INSERM U1051, Institut des Neurosciences de Montpellier, Montpellier, France.,Université Montpellier, Montpellier, France
| | - Mélissa Rosell
- UMR5247-CNRS-UM ENSCM Faculté de Pharmacie, Institut des Biomolecules Max Mousseron (IBMM), Montpellier, France
| | - Claire Angebault-Prouteau
- Université Montpellier, Montpellier, France.,INSERM U1046, UMR CNRS 9214, CHRU de Montpellier, Montpellier, France
| | - Guy Lenaers
- INSERM U1083, CNRS UMR 6015, MitoVasc-MitoLab, Université d'Angers, Angers, France
| | - Isabelle Meunier
- INSERM U1051, Institut des Neurosciences de Montpellier, Montpellier, France.,National Reference Centre for Inherited Sensory Disorders, CHU, Montpellier, France
| | - Joseph Vercauteren
- UMR5247-CNRS-UM ENSCM Faculté de Pharmacie, Institut des Biomolecules Max Mousseron (IBMM), Montpellier, France
| | - Thierry Durand
- UMR5247-CNRS-UM ENSCM Faculté de Pharmacie, Institut des Biomolecules Max Mousseron (IBMM), Montpellier, France
| | - Céline Crauste
- UMR5247-CNRS-UM ENSCM Faculté de Pharmacie, Institut des Biomolecules Max Mousseron (IBMM), Montpellier, France
| | - Philippe Brabet
- INSERM U1051, Institut des Neurosciences de Montpellier, Montpellier, France.,Université Montpellier, Montpellier, France
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10
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Wang YP, Liang ZY, Chen S, Yang WC, Kong JH. Chronic photodamage in the chicken retina using 650-nm semiconductor laser. Int J Ophthalmol 2019; 12:936-942. [PMID: 31236349 DOI: 10.18240/ijo.2019.06.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Accepted: 05/05/2019] [Indexed: 11/23/2022] Open
Abstract
AIM To investigate the occurrence of chronic photodamage in the cone-based retina, following long-term exposure to a 650-nm semiconductor laser (power: 2 mW). METHODS Chickens fed for 1mo under natural light after hatching were irradiated with 650-nm laser light at different times each day. Fifteen animals were included in each group. Group A was a control group, irradiated with natural light during the entire study. Group B was irradiated with laser for 3 min/d. Group C was irradiated with laser for 6 min/d. Group D was irradiated with laser for 30 min/d. The duration of the light experiment was 6mo. We obtained data at 1, 3, and 6mo, including measuring the retinal thickness in vivo using optical coherence tomography, hematoxylin and eosin staining, TUNEL assay, apoptosis staining, malondialdehyde (MDA) content, superoxide dismutase (SOD) activity, and Western blotting to detect changes in L/M opsins and rhodopsin. RESULTS At 1mo, the MDA content in Group D was higher than that observed in Group A (P=0.019). At 3mo the MDA content in Groups C and D was higher than that reported in Group A (P=0.026, 0.003). At 6mo, the MDA content in Groups B, C, and D was higher than that observed in Group A (P=0.038, 0.032, 0.000, respectively). There was no difference in SOD activity, and L/M opsin and rhodopsin content between the groups at 1 and 3mo. The SOD activity in group D was significantly decreased at 6mo (P=0.000), as was the content of rhodopsin. There was no significant reduction observed in retinal thickness, abnormal cell arrangement, and positive staining of TUNEL in the groups during the 6-month study period. CONCLUSION Irradiation using a 650 nm semiconductor laser (power: 2 mW) for 6min per day over 6mo do not cause photodamage. Similarly, a 3-month exposure of 30min per day do not cause damage. However, irradiation for 6mo resulted in a significant increase in the content of free radicals and a decrease in the content of rhodopsin in the retina, suggesting the presence of photodamage.
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Affiliation(s)
- Yi-Peng Wang
- Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300000, China.,Anyang Eye Hospital, Anyang 455000, Henan Province, China
| | - Ze-Yu Liang
- Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Hospital, Tianjin 300000, China
| | - Song Chen
- Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Hospital, Tianjin 300000, China
| | - Wen-Chao Yang
- Anyang Eye Hospital, Anyang 455000, Henan Province, China
| | - Jia-Hui Kong
- Anyang Eye Hospital, Anyang 455000, Henan Province, China
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11
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Zhang T, Gillies M, Wang Y, Shen W, Bahrami B, Zeng S, Zhu M, Yao W, Zhou F, Murray M, Wang K, Zhu L. Simvastatin protects photoreceptors from oxidative stress induced by all-trans-retinal, through the up-regulation of interphotoreceptor retinoid binding protein. Br J Pharmacol 2019; 176:2063-2078. [PMID: 30825184 PMCID: PMC6534793 DOI: 10.1111/bph.14650] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 02/10/2019] [Accepted: 02/14/2019] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Simvastatin is a 3-hydroxy-3-methylglutaryl CoA reductase inhibitor with multiple targets and effects. It protects neurons in the brain, but its protective effects on photoreceptors are unclear. In this study, we evaluated the neuroprotective effect of simvastatin on photoreceptors exposed to stress induced by all-trans-retinal (atRAL). EXPERIMENTAL APPROACH AlamarBlue and LDH assays were used to evaluate the viability and metabolic activity of Y79 cells (a retinoblastoma cell line) exposed to atRAL-induced stress with or without simvastatin pretreatment. Changes in cellular ROS were evaluated using flow cytometry and mitochondrial stress markers JC-1 and HSP60. Changes in levels of two photoreceptor-specific markers, cone-rod homeobox protein (CRX) and interphotoreceptor retinoid binding protein (IRBP), were evaluated with western blot. The results were validated in ex vivo human retinal explants and a mouse model of photoreceptor degeneration. KEY RESULTS Simvastatin improved mitochondrial function, alleviated oxidative stress and up-regulated the photoreceptor-specific markers IRBP and its upstream regulator CRX in Y79 cells and ex vivo human retinal explants under atRAL-induced stress. Simvastatin attenuated photoreceptor degeneration in association with up-regulation of IRBP and CRX expression after knockdown of IRBP in a murine model. CONCLUSION AND IMPLICATIONS Our findings suggest that simvastatin has a novel role in protecting photoreceptors from atRAL-induced stress. Simvastatin treatment resulted in up-regulation of IRBP and its upstream transcription factor CRX in Y79 cells, ex vivo human retinal explants, and murine retinas in vivo. Further studies of simvastatin to treat photoreceptor degeneration are warranted.
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Affiliation(s)
- Ting Zhang
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
| | - Mark Gillies
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
| | - Ying Wang
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
| | - Weiyong Shen
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
| | - Bobak Bahrami
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
| | - Shaoxue Zeng
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
- Department of Ophthalmology, West China HospitalSichuan UniversityChengduSichuanChina
| | - Meidong Zhu
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
- New South Wales Organ and Tissue Donation ServiceNew South Wales Tissue Bank, Sydney Eye HospitalSydneyNew South WalesAustralia
| | - Wenjuan Yao
- School of PharmacyThe University of SydneySydneyNew South WalesAustralia
- Department of PharmacologyNantong University Medical CollegeNantongJiangsuChina
| | - Fanfan Zhou
- School of PharmacyThe University of SydneySydneyNew South WalesAustralia
| | - Michael Murray
- Discipline of Pharmacology, Faculty of Medicine and HealthThe University of SydneySydneyNew South WalesAustralia
| | - Ke Wang
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear MedicineJiangsu Institute of Nuclear MedicineWuxiJiangsuChina
| | - Ling Zhu
- Save Sight InstituteThe University of SydneySydneyNew South WalesAustralia
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12
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Moine E, Brabet P, Guillou L, Durand T, Vercauteren J, Crauste C. New Lipophenol Antioxidants Reduce Oxidative Damage in Retina Pigment Epithelial Cells. Antioxidants (Basel) 2018; 7:E197. [PMID: 30572579 PMCID: PMC6315395 DOI: 10.3390/antiox7120197] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 12/13/2018] [Accepted: 12/16/2018] [Indexed: 12/31/2022] Open
Abstract
Age-related macular degeneration (AMD) is a multifactorial pathology and its progression is exacerbated by oxidative stress. Oxidation and photo-oxidation reactions modify lipids in retinal cells, contribute to tissue injury, and lead to the formation of toxic adducts. In particular, autofluorescent pigments such as N-retinylidene-N-retinylethanolamine (A2E) accumulate as lipofuscin in retinal pigment epithelial cells, contribute to the production of additional reactive oxygen species (ROS), and lead to cell degeneration. In an effort to develop efficient antioxidants to reduce damage caused by lipid oxidation, various natural polyphenols were structurally modified to increase their lipophilicity (lipophenols). In this study, resveratrol, phloroglucinol, quercetin and catechin were selected and conjugated to various polyunsaturated fatty acids (PUFAs) using classical chemical strategies or enzymatic reactions. After screening for cytotoxicity, the capacity of the synthesized lipophenols to reduce ROS production was evaluated in ARPE-19 cells subjected to H₂O₂ treatment using a dichlorofluorescein diacetate probe. The positions of the PUFA on the polyphenol core appear to influence the antioxidant effect. In addition, two lipophenolic quercetin derivatives were evaluated to highlight their potency in protecting ARPE-19 cells against A2E photo-oxidation toxicity. Quercetin conjugated to linoleic or α-linolenic acid were promising lipophilic antioxidants, as they protected ARPE-19 cells from A2E-induced cell death more effectively than the parent polyphenol, quercetin.
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Affiliation(s)
- Espérance Moine
- Institute of Biomolecules Max Mousseron (IBMM), UMR 5247-CNRS-UM-ENSCM, Faculty of Pharmacy, 15 av. Charles Flahault, 34093 Montpellier, France.
| | - Philippe Brabet
- Institute for Neurosciences of Montpellier, INSERM U1051-UM, Hospital St Eloi, 80 rue Augustin Fliche, 34091 Montpellier, France.
| | - Laurent Guillou
- Institute for Neurosciences of Montpellier, INSERM U1051-UM, Hospital St Eloi, 80 rue Augustin Fliche, 34091 Montpellier, France.
| | - Thierry Durand
- Institute of Biomolecules Max Mousseron (IBMM), UMR 5247-CNRS-UM-ENSCM, Faculty of Pharmacy, 15 av. Charles Flahault, 34093 Montpellier, France.
| | - Joseph Vercauteren
- Institute of Biomolecules Max Mousseron (IBMM), UMR 5247-CNRS-UM-ENSCM, Faculty of Pharmacy, 15 av. Charles Flahault, 34093 Montpellier, France.
| | - Céline Crauste
- Institute of Biomolecules Max Mousseron (IBMM), UMR 5247-CNRS-UM-ENSCM, Faculty of Pharmacy, 15 av. Charles Flahault, 34093 Montpellier, France.
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13
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George AK, Singh M, Homme RP, Majumder A, Sandhu HS, Tyagi SC. A hypothesis for treating inflammation and oxidative stress with hydrogen sulfide during age-related macular degeneration. Int J Ophthalmol 2018; 11:881-887. [PMID: 29862191 DOI: 10.18240/ijo.2018.05.26] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/12/2018] [Indexed: 12/20/2022] Open
Abstract
Age-related macular degeneration (AMD) is a leading cause of blindness and is becoming a global crisis since affected people will increase to 288 million by 2040. Genetics, age, diabetes, gender, obesity, hypertension, race, hyperopia, iris-color, smoking, sun-light and pyroptosis have varying roles in AMD, but oxidative stress-induced inflammation remains a significant driver of pathobiology. Eye is a unique organ as it contains a remarkable oxygen-gradient that generates reactive oxygen species (ROS) which upregulates inflammatory pathways. ROS becomes a source of functional and morphological impairments in retinal pigment epithelium (RPE), endothelial cells and retinal ganglion cells. Reports demonstrated that hydrogen sulfide (H2S) acts as a signaling molecule and that it may treat ailments. Therefore, we propose a novel hypothesis that H2S may restore homeostasis in the eyes thereby reducing damage caused by oxidative injury and inflammation. Since H2S has been shown to be a powerful antioxidant because of its free-radicals' inhibition properties in addition to its beneficial effects in age-related conditions, therefore, patients may benefit from H2S salubrious effects not only by minimizing their oxidant and inflammatory injuries to retina but also by lowering retinal glutamate excitotoxicity.
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Affiliation(s)
- Akash K George
- Eye and Vision Science Laboratory, Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA.,Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA
| | - Mahavir Singh
- Eye and Vision Science Laboratory, Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA.,Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA
| | - Rubens Petit Homme
- Eye and Vision Science Laboratory, Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA.,Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA
| | - Avisek Majumder
- Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA.,Department of Biochemistry and Molecular Genetics, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA
| | - Harpal S Sandhu
- Department of Ophthalmology and Visual Sciences, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA.,Kentucky Lions Eye Center, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA
| | - Suresh C Tyagi
- Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA
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14
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Wang K, Zhu X, Zhang K, Zhou F, Zhu L. Neuroprotective effect of tetramethylpyrazine against all-trans-retinal toxicity in the differentiated Y-79 cells via upregulation of IRBP expression. Exp Cell Res 2017; 359:120-128. [PMID: 28780307 DOI: 10.1016/j.yexcr.2017.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 07/30/2017] [Accepted: 08/02/2017] [Indexed: 11/25/2022]
Abstract
It is estimated that abnormal accumulation of all-trans-retinal (atRAL) is a leading cause of photoreceptor degeneration in retinal degenerative diseases. Deficiency of interphotoreceptor retinoid-binding protein (IRBP), a retinoid transporter in the visual cycle, is responsible for the impaired clearance of atRAL and results in atRAL toxicity in retina. Therefore, IRBP has been proposed to be a potent target in preventing atRAL-induced photoreceptor degeneration. In this study, the neuroprotective effect of tetramethylpyrazine (TMP) against atRAL toxicity in the differentiated Y-79 cells, a in vitro model of photoreceptor, was first investigated. Our findings showed that atRAL could induce cytotoxicity, oxidative/nitrosative stresses, apoptosis and leukostasis in the differentiated Y-79 cells; however, the pre-treatment of TMP significantly attenuated such effects in a dose-dependent manner. Furthermore, our results indicated that TMP exerted its neuroprotective effect mainly through upregulating IRBP expression. The present study significantly contributes to better understanding the important role of IRBP in retinal degenerative diseases and forms the basis of the therapeutic development of TMP in such diseases in the future.
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Affiliation(s)
- Ke Wang
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, Jiangsu Province, China.
| | - Xue Zhu
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, Jiangsu Province, China
| | - Kai Zhang
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, Jiangsu Province, China
| | - Fanfan Zhou
- Faculty of Pharmacy, University of Sydney, NSW 2006, Australia
| | - Ling Zhu
- Save Sight Institute, University of Sydney, NSW 2000, Australia
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15
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Cubizolle A, Guillou L, Mollereau B, Hamel CP, Brabet P. Fatty acid transport protein 1 regulates retinoid metabolism and photoreceptor development in mouse retina. PLoS One 2017; 12:e0180148. [PMID: 28672005 PMCID: PMC5495297 DOI: 10.1371/journal.pone.0180148] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Accepted: 06/09/2017] [Indexed: 01/22/2023] Open
Abstract
In retinal pigment epithelium (RPE), RPE65 catalyzes the isomerization of all-trans-retinyl fatty acid esters to 11-cis-retinol in the visual cycle and controls the rhodopsin regeneration rate. However, the mechanisms by which these processes are regulated are still unclear. Fatty Acid Transport Protein 1 (FATP1) is involved in fatty acid uptake and lipid metabolism in a variety of cell types. FATP1 co-localizes with RPE65 in RPE and inhibits its isomerase activity in vitro. Here, we further investigated the role of FATP1 in the visual cycle using transgenic mice that overexpress human FATP1 specifically in the RPE (hFATP1TG mice). The mice displayed no delay in the kinetics of regeneration of the visual chromophore 11-cis-retinal after photobleaching and had no defects in light sensitivity. However, the total retinoid content was higher in the hFATP1TG mice than in wild type mice, and the transgenic mice also displayed an age-related accumulation (up to 40%) of all-trans-retinal and retinyl esters that was not observed in control mice. Consistent with these results, hFATP1TG mice were more susceptible to light-induced photoreceptor degeneration. hFATP1 overexpression also induced an ~3.5-fold increase in retinosome autofluorescence, as measured by two-photon microscopy. Interestingly, hFATP1TG retina contained ~25% more photoreceptor cells and ~35% longer outer segments than wild type mice, revealing a non-cell-autonomous effect of hFATP1 expressed in the RPE. These data are the first to show that FATP1-mediated fatty acid uptake in the RPE controls both retinoid metabolism in the outer retina and photoreceptor development.
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Affiliation(s)
- Aurélie Cubizolle
- Inserm U1051, Institute for Neurosciences of Montpellier, Montpellier, France
| | - Laurent Guillou
- Inserm U1051, Institute for Neurosciences of Montpellier, Montpellier, France
| | - Bertrand Mollereau
- Laboratoire de Biologie et de Modélisation de la Cellule, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Christian P Hamel
- Inserm U1051, Institute for Neurosciences of Montpellier, Montpellier, France
| | - Philippe Brabet
- Inserm U1051, Institute for Neurosciences of Montpellier, Montpellier, France
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