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Petrela RB, Patel SP. The soil and the seed: The relationship between Descemet's membrane and the corneal endothelium. Exp Eye Res 2023; 227:109376. [PMID: 36592681 DOI: 10.1016/j.exer.2022.109376] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 12/31/2022]
Abstract
Descemet's membrane (DM), the basement membrane of the corneal endothelium, is formed from the extracellular matrix (ECM) secreted by corneal endothelial cells. The ECM supports the growth and function of the corneal endothelial cells. Changes to DM are central to the diagnosis of the most common corneal endothelial disease, Fuchs endothelial corneal dystrophy (FECD). Changes in DM are also noted in systemic diseases such as diabetes mellitus. In FECD, the DM progressively accumulates guttae, "drop-like deposits" that disrupt the corneal endothelial cell monolayer. While the pathophysiologic changes to corneal endothelial cells in the course of FECD have been well described and reviewed, the changes to DM have received limited attention. The reciprocity of influence between the corneal endothelial cells and DM demands full attention to the latter in our search for novel treatment and preventive strategies. In this review, we discuss what is known about the formation and composition of DM and how it changes in FECD and other conditions. We review characteristics of guttae and the interplay between corneal endothelial cells and guttae, particularly as it might apply to future cell-based and genetic therapies for FECD.
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Affiliation(s)
- Redion B Petrela
- Ross Eye Institute, Department of Ophthalmology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, 1176 Main Street, Buffalo, NY, 14209, USA; Norton College of Medicine, State University of New York Upstate Medical University, 750 East Adams Street, Syracuse, NY, 13210, USA.
| | - Sangita P Patel
- Ross Eye Institute, Department of Ophthalmology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, 1176 Main Street, Buffalo, NY, 14209, USA; Research and Ophthalmology Services, Veterans Administration of Western New York Healthcare System, 3495 Bailey Ave, Buffalo, NY, 14215, USA.
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2
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Investigation of the HelioVital filter foil revealed protective effects against UVA1 irradiation-induced DNA damage and against UVA1-induced expression of matrixmetalloproteinases (MMP) MMP1, MMP2, MMP3 and MMP15. Photochem Photobiol Sci 2022; 21:361-372. [PMID: 35174452 DOI: 10.1007/s43630-022-00177-4] [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: 12/14/2021] [Accepted: 01/21/2022] [Indexed: 10/19/2022]
Abstract
The damaging effects of solar ultraviolet (UV) radiation exposure to human skin are well known and can reach from accelerated skin aging (photoaging) to skin cancer. Much of the damaging effects of solar UVA (320-400 nm) radiation is associated with the induction of reactive oxygen species (ROS), which are capable to cause oxidative damage to DNA like the oxidized guanosine 8-hydroxy-2' -deoxyguanosine (8-OHdG). Therefore, new UV protective strategies, have to be tested for their efficiency to shield against UV induced damage. We investigated the protective effects of HelioVital sun protection filter foil against UVA1 irradiation in skin cells. It could be shown, that HelioVital sun protection filter foil has protective effects against UVA1 irradiation induced changes in matrix metalloproteinase (MMP) expression. Furthermore a UVA1-dependant regulation of MMP15 in human fibroblasts could be shown for the first time in this context. In addition, this study demonstrated the protective effect of the HelioVital filter film against UVA1-induced ROS production and DNA damage. These results could pave the way for clinical studies with HelioVital filter foil shielding against the damaging effects of phototherapy and other forms of irradiation therapy, thereby increasing the safety and treatment opportunities of these forms of therapy.
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3
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Abdelftah Z, Gaber AR, Abo-Eleneen RE, EL-Bakry AM. Microstructure characteristics of cornea of some birds: a comparative study. BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES 2021. [DOI: 10.1186/s43088-021-00155-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Light is the critical factor that affects the eye's morphology and auxiliary plans. The ecomorphological engineering of the cornea aids the physiological activities of the cornea during connections between photoreceptor neurons and light photons. Cornea was dissected free from the orbit from three avian species as ibis (Eudocium albus), duck (Anas platyrhynchus domesticus) and hawk (Buteo Buteo) and prepared for light and scanning electron microscopy and special stain for structural comparison related to function.
Results
The three investigated avian species are composed of three identical layers; epithelium, stroma, and endothelium, and two basement membranes; bowman's and Descemet’s membrane, separating two cellular layers, except for B. buteo which only has a Descemet’s membrane. The corneal layers in the investigated species display different affinity to stain with Periodic Acid Schiff stain. The external corneal surface secured by different normal epithelial cells ran from hexagonal to regular polygonal cells. Those epithelial cells are punctured by different diameter microholes and microplicae and microvilli of various length. Blebs are scarcely distributed over their surface. The present investigation utilized histological, histochemical and SEM examination.
Conclusions
The study presents a brief image/account of certain structures of cornea for three of Avian’s species. Data distinguish the anatomic structures of the owl's eye. The discussion explains the role of some functional anatomical structures all through the vision.
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Zhou X, Backman LJ, Danielson P. Activation of NF-κB signaling via cytosolic mitochondrial RNA sensing in kerotocytes with mitochondrial DNA common deletion. Sci Rep 2021; 11:7360. [PMID: 33795727 PMCID: PMC8016944 DOI: 10.1038/s41598-021-86522-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 03/16/2021] [Indexed: 02/01/2023] Open
Abstract
Scar formation as a result of corneal wound healing is a leading cause of blindness. It is a challenge to understand why scar formation is more likely to occur in the central part of the cornea as compared to the peripheral part. The purpose of this study was to unravel the underlying mechanisms. We applied RNA-seq to uncover the differences of expression profile in keratocytes in the central/peripheral part of the cornea. The relative quantity of mitochondrial RNA was measured by multiplex qPCR. The characterization of mitochondrial RNA in the cytoplasm was confirmed by immunofluoresence microscope and biochemical approach. Gene expression was analyzed by western blot and RT qPCR. We demonstrate that the occurrence of mitochondrial DNA common deletion is greater in keratocytes from the central cornea as compared to those of the peripheral part. The keratocytes with CD have elevated oxidative stress levels, which leads to the leakage of mitochondrial double-stranded RNA into the cytoplasm. The cytoplasmic mitochondrial double-stranded RNA is sensed by MDA5, which induces NF-κB activation. The NF-κB activation thereafter induces fibrosis-like extracellular matrix expressions and IL-8 mRNA transcription. These results provide a novel explanation of the different clinical outcome in different regions of the cornea during wound healing.
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Affiliation(s)
- Xin Zhou
- grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, 90187 Umeå, Sweden
| | - Ludvig J. Backman
- grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, 90187 Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, 90187 Umeå, Sweden
| | - Patrik Danielson
- grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, 90187 Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Clinical Sciences, Ophthalmology, Umeå University, Umeå, Sweden
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Waszczykowska A, Bartosiewicz K, Podgórski M, Zmysłowska-Polakowska E, Jurowski P. Conjunctival Ultraviolet Autofluorescence as a Measure of Riboflavin and Ultraviolet and Accelerated Cross-Linking Exposure in Keratoconic Patients. J Clin Med 2020; 9:jcm9092693. [PMID: 32825314 PMCID: PMC7565581 DOI: 10.3390/jcm9092693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/10/2020] [Accepted: 08/17/2020] [Indexed: 11/16/2022] Open
Abstract
Purpose: The study was performed to analyze the prevalence of the conjunctival ultraviolet autofluorescence (CUVAF) area in keratoconic eyes and changes caused by UVA-irradiation as a component of accelerated corneal cross-linking (aCXL). Methods: The study group involved 20 keratoconic patients subjected to aCXL surgery in one eye. The comparative group consisted of 111 age- and sex-matched patients with healthy corneas. The images of the anterior segment in both patient groups were taken using a Coroneo camera. In the study group the photos were taken before and immediately after the surgery, and 7 and 30 days following the procedure. Results: Nasal and temporal autofluorescence area (AN+T) were significantly smaller in a keratoconic patients group compared to control group (p = 0.0001). Patients with the third stage of keratoconus had significantly higher AN+T (p = 0.0277) compared with individuals with lower stage keratoconus. No statistically significant CUVAF changes were observed after the aCXL procedure. In keratoconic patients with primary CUVAF undergoing aCXL, a temporary fast enlargement of the autofluorescence area was observed. Conclusions: The eyes undergoing the aCXL procedure showed no difference in the size of the CUVAF area but such patients should be in strict follow-up in order to reveal UV-related ocular surface diseases.
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Affiliation(s)
- Arleta Waszczykowska
- Department of Ophthalmology and Vision Rehabilitation, 2nd Chair of Eye Diseases, Medical University of Lodz, Żeromskiego 113, 90-549 Łódź, Poland; (K.B.); (P.J.)
- Correspondence: ; Tel./Fax: +48-426-393-636
| | - Krzysztof Bartosiewicz
- Department of Ophthalmology and Vision Rehabilitation, 2nd Chair of Eye Diseases, Medical University of Lodz, Żeromskiego 113, 90-549 Łódź, Poland; (K.B.); (P.J.)
| | - Michał Podgórski
- Department of Diagnostic Imaging, Polish Mother’s Memorial Hospital Research Institute, Rzgowska 281/289, 93-338 Lodz, Poland;
| | | | - Piotr Jurowski
- Department of Ophthalmology and Vision Rehabilitation, 2nd Chair of Eye Diseases, Medical University of Lodz, Żeromskiego 113, 90-549 Łódź, Poland; (K.B.); (P.J.)
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Jun ES, Kim YJ, Kim HH, Park SY. Gold Nanoparticles Using Ecklonia stolonifera Protect Human Dermal Fibroblasts from UVA-Induced Senescence through Inhibiting MMP-1 and MMP-3. Mar Drugs 2020; 18:E433. [PMID: 32825040 PMCID: PMC7551933 DOI: 10.3390/md18090433] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/13/2020] [Accepted: 08/13/2020] [Indexed: 02/06/2023] Open
Abstract
The effect of gold nanoparticles (GNPs) synthesized in marine algae has been described in the context of skin, where they have shown potential benefit. Ecklonia stolonifera (ES) is a brown algae that belongs to the Laminariaceae family, and is widely used as a component of food and medicine due to its biological activities. However, the role of GNPs underlying cellular senescence in the protection of Ecklonia stolonifera gold nanoparticles (ES-GNPs) against UVA irradiation is less well known. Here, we investigate the antisenescence effect of ES-GNPs and the underlying mechanism in UVA-irradiated human dermal fibroblasts (HDFs). The DPPH and ABTS radical scavenging activity of ES extracts was analyzed. These analyses showed that ES extract has potent antioxidant properties. The facile and optimum synthesis of ES-GNPs was established using UV-vis spectra. The surface morphology and crystallinity of ES-GNPs were demonstrated using high resolution transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR). ES-GNPs presented excellent photocatalytic activity, as shown by the photo-degradation of methylene blue and rhodamine B. A cellular senescence model was established by irradiating HDFs with UVA. UVA-irradiated HDFs exhibited increased expression of senescence-associated β-galactosidase (SA-β-galactosidase). However, pretreatment with ES-GNPs resulted in reduced SA-β-galactosidase activity in UVA-irradiated HDFs. Intracellular ROS levels and G1 arrest in UVA-irradiated HDFs were checked against the background of ES-GNP treatment to investigate the antisenescence effects of ES-GNPs. The results showed that ES-GNPs significantly inhibit UVA-induced ROS levels and G1 arrest. Importantly, ES-GNPs significantly downregulated the transcription and translation of MMP (matrix metalloproteinases)-1/-3, which regulate cellular senescence in UVA-irradiated HDFs. These findings indicate that our optimal ES-GNPs exerted an antisenescence effect on UVA-irradiated HDFs by inhibiting MMP-1/-3 expression. Collectively, we posit that ES-GNPs may potentially be used to treat photoaging of the skin.
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Affiliation(s)
- Eun-Sook Jun
- Biomedical Research Institute, Pusan National University Hospital, Busan 49241, Korea;
| | - Yeong Jin Kim
- Department of Laboratory Medicine, Pusan National University Hospital, Busan 49241, Korea;
| | - Hyung-Hoi Kim
- Biomedical Research Institute, Pusan National University Hospital, Busan 49241, Korea;
- Department of Laboratory Medicine, Pusan National University Hospital, Busan 49241, Korea;
| | - Sun Young Park
- Bio-IT Fusion Technology Research Institute, Pusan National University, Busan 46241, Korea
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Chronic UVA1 Irradiation of Human Dermal Fibroblasts: Persistence of DNA Damage and Validation of a Cell Cultured-Based Model of Photoaging. J Invest Dermatol 2019; 139:1821-1824.e3. [PMID: 30878671 DOI: 10.1016/j.jid.2019.02.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 01/22/2019] [Accepted: 02/11/2019] [Indexed: 11/22/2022]
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Marek V, Mélik-Parsadaniantz S, Villette T, Montoya F, Baudouin C, Brignole-Baudouin F, Denoyer A. Blue light phototoxicity toward human corneal and conjunctival epithelial cells in basal and hyperosmolar conditions. Free Radic Biol Med 2018; 126:27-40. [PMID: 30040995 DOI: 10.1016/j.freeradbiomed.2018.07.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/12/2018] [Accepted: 07/19/2018] [Indexed: 12/28/2022]
Abstract
AIMS The ocular surface is the very first barrier between the visual system and external environment. It protects the eye from the exposure to various light sources that significantly emit in blue spectrum. However, the impact of blue light on the ocular surface has been poorly explored so far. In this study, we investigated in vitro the phototoxicity of blue light illumination in human epithelial cells of the ocular surface. We worked either in basal conditions or under hyperosmolar stress, in order to mimic dry eye disease (DED) that is the most common disease involving the ocular surface. RESULTS Corneal and conjunctival epithelial cells suffered the most from violet-blue light but also from longer-wave blue light. Exposure to blue wavebands significantly decreased cellular viability, impacted on cellular morphology and provoked reactive oxygen species (ROS) over-production. Conjunctival epithelial cell line had a greater photosensitivity than the corneal epithelial one. Hyperosmolar stress potentiated the blue light phototoxicity, increasing inflammation, altering mitochondrial membrane potential, and triggering the glutathione-based antioxidant system. INNOVATION In human epithelial corneal and conjunctival cells of the ocular surface, we demonstrated the harmful impact of blue light on viability, redox state and inflammation processes, which was modified by hyperosmolarity. CONCLUSION Blue light induced cell death and significant ROS production, and altered the expression of inflammatory genes and operation of the cellular defensive system. We established for the first time that hyperosmolar stress impacted phototoxicity, further suggesting that DED patients might be more sensitive to blue light ocular toxicity.
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Affiliation(s)
- Veronika Marek
- Essilor International, R&D Department, Paris, France; Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France.
| | | | | | - Fanny Montoya
- Essilor International, R&D Department, Paris, France
| | - Christophe Baudouin
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, Paris, France; Versailles-Saint-Quentin-en-Yvelines Université, Versailles, France
| | - Françoise Brignole-Baudouin
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, Paris, France; Sorbonne Paris Cité - Paris Descartes Université, Faculté de Pharmacie de Paris, Département de Toxicologie, Paris, France
| | - Alexandre Denoyer
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, Paris, France; CHU Robert Debré, Université Reims Champagne-Ardenne, Reims, France
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9
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Enhancement of UVB-induced DNA damage repair after a chronic low-dose UVB pre-stimulation. DNA Repair (Amst) 2018; 63:56-62. [PMID: 29448173 DOI: 10.1016/j.dnarep.2018.01.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 11/27/2017] [Accepted: 01/19/2018] [Indexed: 01/13/2023]
Abstract
Absorption of solar ultraviolet (UV) radiation by DNA leads to the formation of the highly mutagenic cyclobutane pyrimidine dimer (CPD). The mutagenicity of CPD is caused, in part, by the fact that their recognition and repair by the nucleotide excision repair (NER) pathway is challenging and slow. It has been previously shown that a pre-stimulation with genotoxic agents improve NER efficiency of CPD, indicating a potential adaptive response of this repair pathway. We have pre-treated human dermal fibroblasts with repeated subletal low doses of UVB (chronic low-dose of UVB; CLUV) to determine whether it could enhance NER capacity to repair CPD. Our results show that CLUV pre-treatment greatly enhances CPD repair but have little effect on the repair of another UV-induced bypirimidine photoproduct, the pyrimidine (6-4) pyrimidone photoproducts (6-4 PP). We have determined that the CLUV treatment activates p53 and we found an increase of DDB2 and XPC gene expression. This is consistent with an increasing level of NER recognition proteins, DDB2 and XPC, we found concentrated at the chromatin. This study represents the first demonstration that chronic UVB exposure can stimulate NER pathway. Altogether, these results shed light on the potential adaptability of the NER by chronic UVB irradiation and the mechanisms involved.
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10
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Zinflou C, Rochette PJ. Ultraviolet A-induced oxidation in cornea: Characterization of the early oxidation-related events. Free Radic Biol Med 2017; 108:118-128. [PMID: 28342848 DOI: 10.1016/j.freeradbiomed.2017.03.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 03/08/2017] [Accepted: 03/20/2017] [Indexed: 11/18/2022]
Abstract
Exposure to sunlight ultraviolet-A (UVA), the main component of solar UV reaching the eyes, is suspected to play an important part in the onset of ocular pathologies. UVA primary biological deleterious effects arise from the photo-induction of oxidative stress in cells. However, the molecular bases linking UVA-induced oxidation to UVA toxicity in eyes remain poorly understood, especially with regards to the cornea. To shed some light on this issue, we have investigated the susceptibility and response potential of the different corneal cellular layers (epithelium, stroma and endothelium) to UVA-induced oxidation. We have monitored UVA-induced immediate effects on cellular redox balance, on mitochondrial membrane potential, on 8-Hydroxy-2'-deoxyguanosine (8-OHdG) accumulation in cellular DNA and on S-glutathionylated proteins (PSSG) levels along whole rabbit corneas. Higher redox imbalance was observed in the posterior part of the cornea following irradiation. Conversely, UVA-altered mitochondrial membrane potentials were observed only in anterior portions of the cornea. UVA-induced 8-OHdG were found in nuclear DNA of epithelia, while they were found in both nuclear and mitochondrial DNA in stromal and endothelial cells. Finally, significantly higher levels of cytosolic PSSG were measured in epithelia and endothelia immediately after UVA exposure, but not in stromas. Taken together, our findings indicate that while corneal epithelial cells are subjected to important modifications in response to UVA exposure, they efficiently limit the early manifestations of UVA-induced toxicity. On the other hand, the corneal endothelium is more susceptible to UVA-induced oxidation-related toxicity.
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Affiliation(s)
- Corinne Zinflou
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec - Université Laval, Hôpital du Saint-Sacrement, Québec, QC, Canada; Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec, QC, Canada
| | - Patrick J Rochette
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec - Université Laval, Hôpital du Saint-Sacrement, Québec, QC, Canada; Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec, QC, Canada; Département d'Ophtalmologie et ORL - chirurgie cervico-faciale, Université Laval, Québec, QC, Canada.
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11
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Freitas-Rodríguez S, Folgueras AR, López-Otín C. The role of matrix metalloproteinases in aging: Tissue remodeling and beyond. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:2015-2025. [PMID: 28499917 DOI: 10.1016/j.bbamcr.2017.05.007] [Citation(s) in RCA: 161] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 05/03/2017] [Accepted: 05/04/2017] [Indexed: 12/28/2022]
Abstract
Proteases are a set of enzymes that have been involved in multiple biological processes throughout evolution. Among them, extracellular matrix (ECM) remodeling has emerged as one of the most relevant functions exerted by these proteins, being essential in the regulation of critical events such as embryonic development or tissue homeostasis. Hence, it is not surprising that dysregulation in any protease function that affects ECM homeostasis may contribute to the aging process. Matrix metalloproteinases (MMPs) are one of the most important families of proteases involved in the tight control of ECM remodeling over time. In this review, we will discuss how MMPs and other proteases alter ECM composition and mechanical properties in aging, thereby affecting stem cell niches and the development of senescent phenotypes. Finally, we will summarize recent findings that associate MMPs with the development of age-related diseases, such as neurodegenerative disorders.
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Affiliation(s)
- Sandra Freitas-Rodríguez
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, 33006 Oviedo, Spain
| | - Alicia R Folgueras
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, 33006 Oviedo, Spain
| | - Carlos López-Otín
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, 33006 Oviedo, Spain; Centro de Investigación Biomédica en Red de Cáncer, Spain.
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12
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Drigeard Desgarnier MC, Fournier F, Droit A, Rochette PJ. Influence of a pre-stimulation with chronic low-dose UVB on stress response mechanisms in human skin fibroblasts. PLoS One 2017; 12:e0173740. [PMID: 28301513 PMCID: PMC5354420 DOI: 10.1371/journal.pone.0173740] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 02/24/2017] [Indexed: 12/16/2022] Open
Abstract
Exposure to solar ultraviolet type B (UVB), through the induction of cyclobutane pyrimidine dimer (CPD), is the major risk factor for cutaneous cancer. Cells respond to UV-induced CPD by triggering the DNA damage response (DDR) responsible for signaling DNA repair, programmed cell death and cell cycle arrest. Underlying mechanisms implicated in the DDR have been extensively studied using single acute UVB irradiation. However, little is known concerning the consequences of chronic low-dose of UVB (CLUV) on the DDR. Thus, we have investigated the effect of a CLUV pre-stimulation on the different stress response pathways. We found that CLUV pre-stimulation enhances CPD repair capacity and leads to a cell cycle delay but leave residual unrepaired CPD. We further analyzed the consequence of the CLUV regimen on general gene and protein expression. We found that CLUV treatment influences biological processes related to the response to stress at the transcriptomic and proteomic levels. This overview study represents the first demonstration that human cells respond to chronic UV irradiation by modulating their genotoxic stress response mechanisms.
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Affiliation(s)
- Marie-Catherine Drigeard Desgarnier
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec – Université Laval, Hôpital du Saint-Sacrement, Québec, Quebec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec, Quebec, Canada
| | - Frédéric Fournier
- Centre de Protéomique, Centre de Recherche du CHU de Québec – Université Laval, Québec, Quebec, Canada
- Département de Médicine Moléculaire, Université Laval, Québec, Canada
| | - Arnaud Droit
- Centre de Protéomique, Centre de Recherche du CHU de Québec – Université Laval, Québec, Quebec, Canada
- Département de Médicine Moléculaire, Université Laval, Québec, Canada
| | - Patrick J. Rochette
- Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec – Université Laval, Hôpital du Saint-Sacrement, Québec, Quebec, Canada
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Université Laval, Québec, Quebec, Canada
- Département d’Ophtalmologie et ORL - Chirurgie Cervico-Faciale, Université Laval, Québec, Canada
- * E-mail:
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Akhtar S, Khan AA, Albuhayzah HA, Almubrad TM. Cornea and its adaptation to environment and accommodation function in veiled chameleon (Chamaeleo calyptratus): ultrastructure and 3D transmission electron tomography. Microsc Res Tech 2017; 80:578-589. [PMID: 28150361 DOI: 10.1002/jemt.22833] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 12/18/2016] [Accepted: 12/22/2016] [Indexed: 11/08/2022]
Abstract
We investigate the ultrastructural features and 3D electron tomography of chameleon (Chamaeleon calyptratus) which is a native of desert environments of Saudi Arabia. The corneas of the chameleon were fixed in 2.5% glutaraldehyde containing cuprolinic blue in sodium acetate buffer for electron microscopy and tomography, and observed under a JEOL 1400 transmission electron microscope. The thin cornea (21.92 μm) contained 28-30 collagen fibril lamellae. The middle stromal lamellae (from 13 to 19) contained keratocytes with a long cell process and filled with granular material. The CF diameter increased from lamella 1 (30.44 ± 1.03) to Lamella 5 (52.83 ± 2.00) then decreased towards the posterior stoma. The percentage of large CF diameters (55-65 nm) was very high in the lamellae L14 (38.8%) and L15 (85.7%). The mean PGs area of the posterior stroma (448.21 ± 24.84 nm2 ) was significantly larger than the mean PGs area of the anterior, (309.86 ± 8.2 nm2 ) and middle stroma 245.94 ± 8.28 nm2 ). 3D electron tomography showed the distribution of PGs around and over the CF. Variable diameters of CFs in the anterior stroma may provide compact lamellae which may restrict the low wavelength of light. Variable diameters of CFs in the anterior stroma may provide compact lamellae which may restrict the low wavelength of light. This accommodation function is achieved by bending of the cornea. During bending the anterior stroma was stretched and the posterior stroma was compressed due to the presence of small CFs. The middle stroma remained stiff due to the presence of large CFs. Large proteoglycans not only maintain hydration for a longer period of time, but also act as a lubricant to neutralise the shear forces in the anterior and posterior stroma during bending.
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Affiliation(s)
- Saeed Akhtar
- Cornea Research Chair, Department of Optometry, College of Applied Medical College, King Saud University, Riyadh, Saudi Arabia
| | - Adnan A Khan
- Cornea Research Chair, Department of Optometry, College of Applied Medical College, King Saud University, Riyadh, Saudi Arabia
| | - Hussain A Albuhayzah
- Cornea Research Chair, Department of Optometry, College of Applied Medical College, King Saud University, Riyadh, Saudi Arabia
| | - Turki M Almubrad
- Cornea Research Chair, Department of Optometry, College of Applied Medical College, King Saud University, Riyadh, Saudi Arabia
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Akhtar S, Alkhalaf M, Khan AA, Almubrad TM. Ultrastructure Features and Three-Dimensional Transmission Electron Tomography of Dhub Lizard (Uromastyx Aegyptia) Cornea and Its Adaptation to a Desert Environment. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:922-932. [PMID: 27619263 DOI: 10.1017/s1431927616011466] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report ultrastructural features and transmission electron tomography of the dhub lizard (Uromastyx aegyptia) cornea and its adaptation to hot and dry environments. Six corneas of dhub lizards were fixed in 2.5% glutaraldehyde and processed for electron microscopy and tomography. The ultrathin sections were observed with a JEOL 1400 transmission electron microscope. The cornea of the dhub lizard is very thin (~28-30 µm). The epithelium constitutes ~14% of the cornea, whereas the stroma constitutes 80% of the cornea. The middle stromal lamellae are significantly thicker than anterior and posterior stromal lamellae. Collagen fibril (CF) diameters in the anterior stroma are variable in size (25-75 nm). Proteoglycans (PGs) are very large in the middle and posterior stroma, whereas they are small in the anterior stroma. Three-dimensional electron tomography was carried out to understand the structure and arrangement of the PG and CFs. The presence of large PGs in the posterior and middle stroma might help the animal retain a large amount of water to protect it from dryness. The dhub corneal structure is equipped to adapt to the dry and hot desert environment.
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Affiliation(s)
- Saeed Akhtar
- Cornea Research Chair,Department of Optometry,College of Applied Medical Science,King Saud University,PO Box 10219, Riyadh 11433,Saudi Arabia
| | - Mousa Alkhalaf
- Cornea Research Chair,Department of Optometry,College of Applied Medical Science,King Saud University,PO Box 10219, Riyadh 11433,Saudi Arabia
| | - Adnan A Khan
- Cornea Research Chair,Department of Optometry,College of Applied Medical Science,King Saud University,PO Box 10219, Riyadh 11433,Saudi Arabia
| | - Turki M Almubrad
- Cornea Research Chair,Department of Optometry,College of Applied Medical Science,King Saud University,PO Box 10219, Riyadh 11433,Saudi Arabia
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Couture C, Zaniolo K, Carrier P, Lake J, Patenaude J, Germain L, Guérin SL. The tissue-engineered human cornea as a model to study expression of matrix metalloproteinases during corneal wound healing. Biomaterials 2015; 78:86-101. [PMID: 26686051 DOI: 10.1016/j.biomaterials.2015.11.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 11/04/2015] [Accepted: 11/05/2015] [Indexed: 12/17/2022]
Abstract
Corneal injuries remain a major cause of consultation in the ophthalmology clinics worldwide. Repair of corneal wounds is a complex mechanism that involves cell death, migration, proliferation, differentiation, and extracellular matrix (ECM) remodeling. In the present study, we used a tissue-engineered, two-layers (epithelium and stroma) human cornea as a biomaterial to study both the cellular and molecular mechanisms of wound healing. Gene profiling on microarrays revealed important alterations in the pattern of genes expressed by tissue-engineered corneas in response to wound healing. Expression of many MMPs-encoding genes was shown by microarray and qPCR analyses to increase in the migrating epithelium of wounded corneas. Many of these enzymes were converted into their enzymatically active form as wound closure proceeded. In addition, expression of MMPs by human corneal epithelial cells (HCECs) was affected both by the stromal fibroblasts and the collagen-enriched ECM they produce. Most of all, results from mass spectrometry analyses provided evidence that a fully stratified epithelium is required for proper synthesis and organization of the ECM on which the epithelial cells adhere. In conclusion, and because of the many characteristics it shares with the native cornea, this human two layers corneal substitute may prove particularly useful to decipher the mechanistic details of corneal wound healing.
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Affiliation(s)
- Camille Couture
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Karine Zaniolo
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Patrick Carrier
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Jennifer Lake
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Julien Patenaude
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Lucie Germain
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada; Département de Chirurgie, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Sylvain L Guérin
- CUO-Recherche, Médecine Régénératrice - Centre de recherche FRQS du CHU de Québec-Université Laval, Québec, Canada; Centre de Recherche en Organogénèse expérimentale de l'Université Laval/LOEX, Québec, QC, Canada; Département d'Ophtalmologie, Faculté de médecine, Université Laval, Québec, QC, Canada.
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