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Li RTH, Roman AJ, Sumaroka A, Stanton CM, Swider M, Garafalo AV, Heon E, Vincent A, Wright AF, Megaw R, Aleman TS, Browning AC, Dhillon B, Cideciyan AV. Treatment Strategy With Gene Editing for Late-Onset Retinal Degeneration Caused by a Founder Variant in C1QTNF5. Invest Ophthalmol Vis Sci 2023; 64:33. [PMID: 38133503 PMCID: PMC10746929 DOI: 10.1167/iovs.64.15.33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 11/28/2023] [Indexed: 12/23/2023] Open
Abstract
Purpose Genome editing is an emerging group of technologies with the potential to ameliorate dominant, monogenic human diseases such as late-onset retinal degeneration (L-ORD). The goal of this study was to identify disease stages and retinal locations optimal for evaluating the efficacy of a future genome editing trial. Methods Twenty five L-ORD patients (age range, 33-77 years; median age, 59 years) harboring the founder variant S163R in C1QTNF5 were enrolled from three centers in the United Kingdom and United States. Patients were examined with widefield optical coherence tomography (OCT) and chromatic perimetry under dark-adapted and light-adapted conditions to derive phenomaps of retinal disease. Results were analyzed with a model of a shared natural history of a single delayed exponential across all subjects and all retinal locations. Results Critical age for the initiation of photoreceptor loss ranged from 48 years at the temporal paramacular retina to 74 years at the inferior midperipheral retina. Subretinal deposits (sRET-Ds) became more prevalent as critical age was approached. Subretinal pigment epithelial deposits (sRPE-Ds) were detectable in the youngest patients showing no other structural or functional abnormalities at the retina. The sRPE-D thickness continuously increased, reaching 25 µm in the extrafoveal retina and 19 µm in the fovea at critical age. Loss of light sensitivity preceded shortening of outer segments and loss of photoreceptors by more than a decade. Conclusions Retinal regions providing an ideal treatment window exist across all severity stages of L-ORD.
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Affiliation(s)
- Randa T. H. Li
- Centre for Clinical Brain Sciences, School of Clinical Sciences, University of Edinburgh, Edinburgh, Scotland, United Kingdom
- Princess Alexandra Eye Pavilion, NHS Lothian, Edinburgh, Scotland, United Kingdom
| | - Alejandro J. Roman
- Center for Hereditary Retinal Degenerations, Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Alexander Sumaroka
- Center for Hereditary Retinal Degenerations, Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Chloe M. Stanton
- Medical Research Council Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, United Kingdom
| | - Malgorzata Swider
- Center for Hereditary Retinal Degenerations, Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Alexandra V. Garafalo
- Center for Hereditary Retinal Degenerations, Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Elise Heon
- Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - Ajoy Vincent
- Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - Alan F. Wright
- Medical Research Council Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, United Kingdom
| | - Roly Megaw
- Princess Alexandra Eye Pavilion, NHS Lothian, Edinburgh, Scotland, United Kingdom
- Medical Research Council Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, United Kingdom
| | - Tomas S. Aleman
- Center for Hereditary Retinal Degenerations, Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Andrew C. Browning
- Newcastle Eye Centre, Royal Victoria Infirmary, Newcastle Upon Tyne, United Kingdom
| | - Baljean Dhillon
- Centre for Clinical Brain Sciences, School of Clinical Sciences, University of Edinburgh, Edinburgh, Scotland, United Kingdom
- Princess Alexandra Eye Pavilion, NHS Lothian, Edinburgh, Scotland, United Kingdom
| | - Artur V. Cideciyan
- Center for Hereditary Retinal Degenerations, Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
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2
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Andreazzoli M, Barravecchia I, De Cesari C, Angeloni D, Demontis GC. Inducible Pluripotent Stem Cells to Model and Treat Inherited Degenerative Diseases of the Outer Retina: 3D-Organoids Limitations and Bioengineering Solutions. Cells 2021; 10:cells10092489. [PMID: 34572137 PMCID: PMC8471616 DOI: 10.3390/cells10092489] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/12/2021] [Accepted: 09/15/2021] [Indexed: 12/12/2022] Open
Abstract
Inherited retinal degenerations (IRD) affecting either photoreceptors or pigment epithelial cells cause progressive visual loss and severe disability, up to complete blindness. Retinal organoids (ROs) technologies opened up the development of human inducible pluripotent stem cells (hiPSC) for disease modeling and replacement therapies. However, hiPSC-derived ROs applications to IRD presently display limited maturation and functionality, with most photoreceptors lacking well-developed outer segments (OS) and light responsiveness comparable to their adult retinal counterparts. In this review, we address for the first time the microenvironment where OS mature, i.e., the subretinal space (SRS), and discuss SRS role in photoreceptors metabolic reprogramming required for OS generation. We also address bioengineering issues to improve culture systems proficiency to promote OS maturation in hiPSC-derived ROs. This issue is crucial, as satisfying the demanding metabolic needs of photoreceptors may unleash hiPSC-derived ROs full potential for disease modeling, drug development, and replacement therapies.
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Affiliation(s)
| | - Ivana Barravecchia
- Department of Pharmacy, University of Pisa, 56126 Pisa, Italy;
- Institute of Life Sciences, Scuola Superiore Sant’Anna, 56124 Pisa, Italy;
| | | | - Debora Angeloni
- Institute of Life Sciences, Scuola Superiore Sant’Anna, 56124 Pisa, Italy;
| | - Gian Carlo Demontis
- Department of Pharmacy, University of Pisa, 56126 Pisa, Italy;
- Correspondence: (M.A.); (G.C.D.)
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3
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Hanke-Gogokhia C, Lehmann GL, Benedicto I, de la Fuente-Ortega E, Arshavsky VY, Schreiner R, Rodriguez-Boulan E. Apical CLC-2 in retinal pigment epithelium is crucial for survival of the outer retina. FASEB J 2021; 35:e21689. [PMID: 34085737 PMCID: PMC8252757 DOI: 10.1096/fj.202100349r] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/16/2021] [Accepted: 05/06/2021] [Indexed: 12/15/2022]
Abstract
Knockout of the chloride channel protein 2 (CLC‐2; CLCN2) results in fast progressing blindness in mice. Retinal Pigment Epithelium (RPE) and photoreceptors undergo, in parallel, rapid, and profound morphological changes and degeneration. Immunohistochemistry and electron microscopy of the outer retina and electroretinography of the CLC‐2 KO mouse demonstrated normal morphology at postnatal day 2, followed by drastic changes in RPE and photoreceptor morphology and loss of vision during the first postnatal month. To investigate whether the RPE or the photoreceptors are the primary cause of the degeneration, we injected lentiviruses carrying HA‐tagged CLC‐2 with an RPE‐specific promotor in the subretinal space of CLC‐2‐KO mice at the time of eye opening. As expected, CLC‐2‐HA was expressed exclusively in RPE; strikingly, this procedure rescued the degeneration of both RPE and photoreceptors. Light response in transduced eyes was also recovered. Only a fraction of RPE was transduced with the lentivirus; however, the entire RPE monolayer appears healthy, even the RPE cells not expressing the CLC‐2‐HA. Surprisingly, in contrast with previous physiological observations that postulate that CLC‐2 has a basolateral localization in RPE, our immunofluorescence experiments demonstrated CLC‐2 has an apical distribution, facing the subretinal space and the photoreceptor outer segments. Our findings suggest that CLC‐2 does not play the postulated role in fluid transport at the basolateral membrane. Rather, they suggest that CLC‐2 performs a critical homeostatic role in the subretinal compartment involving a chloride regulatory mechanism that is critical for the survival of both RPE and photoreceptors.
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Affiliation(s)
| | | | - Ignacio Benedicto
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Erwin de la Fuente-Ortega
- Departamento de Ciencias Biomédicas, Facultad de Medicina, Universidad Católica del Norte, Coquimbo, Chile
| | - Vadim Y Arshavsky
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
| | - Ryan Schreiner
- Division of Regenerative Medicine, Ansary Stem Cell Institute, Department of Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Enrique Rodriguez-Boulan
- Department of Ophthalmology, Margaret Dyson Vision Research Institute, Weill Cornell Medicine, New York, NY, USA
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4
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Macke EL, Henningsen E, Jessen E, Zumwalde NA, Landowski M, Western DE, Lee WH, Liu C, Gruenke NP, Doebley AL, Miller S, Pattnaik B, Ikeda S, Gumperz JE, Ikeda A. Loss of Chondroitin Sulfate Modification Causes Inflammation and Neurodegeneration in skt Mice. Genetics 2020; 214:121-134. [PMID: 31754016 PMCID: PMC6944401 DOI: 10.1534/genetics.119.302834] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 11/17/2019] [Indexed: 12/17/2022] Open
Abstract
One major aspect of the aging process is the onset of chronic, low-grade inflammation that is highly associated with age-related diseases. The molecular mechanisms that regulate these processes have not been fully elucidated. We have identified a spontaneous mutant mouse line, small with kinky tail (skt), that exhibits accelerated aging and age-related disease phenotypes including increased inflammation in the brain and retina, enhanced age-dependent retinal abnormalities including photoreceptor cell degeneration, neurodegeneration in the hippocampus, and reduced lifespan. By positional cloning, we identified a deletion in chondroitin sulfate synthase 1 (Chsy1) that is responsible for these phenotypes in skt mice. CHSY1 is a member of the chondroitin N-acetylgalactosaminyltransferase family that plays critical roles in the biosynthesis of chondroitin sulfate, a glycosaminoglycan (GAG) that is attached to the core protein to form the chondroitin sulfate proteoglycan (CSPG). Consistent with this function, the Chsy1 mutation dramatically decreases chondroitin sulfate GAGs in the retina and hippocampus. In addition, macrophage and neutrophil populations appear significantly altered in the bone marrow and spleen of skt mice, suggesting an important role for CHSY1 in the functioning of these immune cell types. Thus, our study reveals a previously unidentified impact of CHSY1 in the retina and hippocampus. Specifically, chondroitin sulfate (CS) modification of proteins by CHSY1 appears critical for proper regulation of immune cells of the myeloid lineage and for maintaining the integrity of neuronal tissues, since a defect in this gene results in increased inflammation and abnormal phenotypes associated with age-related diseases.
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Affiliation(s)
- Erica L Macke
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Erika Henningsen
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Erik Jessen
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
- Department of Biochemistry, University of Wisconsin-Madison, Wisconsin 53706
| | - Nicholas A Zumwalde
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Wisconsin 53706
| | - Michael Landowski
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Daniel E Western
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Wei-Hua Lee
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Che Liu
- Institute for Molecular Virology, University of Wisconsin-Madison, Wisconsin 53706
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Wisconsin 53706
| | - Nathan P Gruenke
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Anna-Lisa Doebley
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Samuel Miller
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
| | - Bikash Pattnaik
- Department of Pediatrics, University of Wisconsin-Madison, Wisconsin 53706
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Wisconsin 53706
- McPherson Eye Research Institute, University of Wisconsin-Madison, Wisconsin 53706
| | - Sakae Ikeda
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
- McPherson Eye Research Institute, University of Wisconsin-Madison, Wisconsin 53706
| | - Jenny E Gumperz
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Wisconsin 53706
| | - Akihiro Ikeda
- Department of Medical Genetics, University of Wisconsin-Madison, Wisconsin 53706
- McPherson Eye Research Institute, University of Wisconsin-Madison, Wisconsin 53706
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5
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Hsu ST, Gabr H, Viehland C, Sleiman K, Ngo HT, Carrasco-Zevallos OM, Vajzovic L, McNabb RP, Stinnett SS, Izatt JA, Kuo AN, Toth CA. Volumetric Measurement of Subretinal Blebs Using Microscope-Integrated Optical Coherence Tomography. Transl Vis Sci Technol 2018; 7:19. [PMID: 29651361 PMCID: PMC5894912 DOI: 10.1167/tvst.7.2.19] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 02/02/2018] [Indexed: 02/06/2023] Open
Abstract
PURPOSE We advance studies of subretinal treatments by developing a microscope-integrated optical coherence tomography (MIOCT) image-based method for measuring the volume of therapeutics delivered into the subretinal space. METHODS A MIOCT image-based volume measurement method was developed and assessed for accuracy and reproducibility by imaging an object of known size in model eyes. This method then was applied to subretinal blebs created by injection of diluted triamcinolone. Bleb volumes obtained from MIOCT were compared to the intended injection volume and the surgeon's estimation of leakage. RESULTS Validation of the image-based volume measurement method showed accuracy to ±1.0 μL (6.0% of measured volume) with no statistically significant variation under different imaging settings. When this method was applied to subretinal blebs, four of 11 blebs without surgeon-observed leakage yielded a mean volume of 32 ± 12.5 μL, in contrast to the intended 50 μL volume injected from the delivery device. This constituted a mean difference of -18 μL (mean percent error, 36 ± 25%). For all 11 blebs, the surgeon's estimations of leakage were significantly different from and showed no correlation with the volume loss based on image-based volume measurements (P < 0.001, paired t-test; intraclass correlation = 0). CONCLUSIONS We validated an accurate and reproducible method for measuring subretinal volumes using MIOCT. Use of this method revealed that the intended volume might not be delivered into the subretinal space. MIOCT can allow for accurate assessment of subretinal dose delivered, which may have therapeutic implications in evaluating the efficacy and toxicity of subretinal therapies. TRANSLATIONAL RELEVANCE Use of MIOCT can provide feedback on the accuracy of subretinal injection volumes delivered.
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Affiliation(s)
- S. Tammy Hsu
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
| | - Hesham Gabr
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
- Department of Ophthalmology, Ain-Shams University, Cairo, Egypt
| | | | - Karim Sleiman
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
| | - Hoan T. Ngo
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | | | - Lejla Vajzovic
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
| | - Ryan P. McNabb
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
| | - Sandra S. Stinnett
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
| | - Joseph A. Izatt
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Anthony N. Kuo
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Cynthia A. Toth
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC, USA
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
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6
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Kowalczuk L, Matet A, Dor M, Bararpour N, Daruich A, Dirani A, Behar-Cohen F, Thomas A, Turck N. Proteome and Metabolome of Subretinal Fluid in Central Serous Chorioretinopathy and Rhegmatogenous Retinal Detachment: A Pilot Case Study. Transl Vis Sci Technol 2018; 7:3. [PMID: 29359109 PMCID: PMC5772832 DOI: 10.1167/tvst.7.1.3] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 11/02/2017] [Indexed: 12/27/2022] Open
Abstract
PURPOSE To investigate the molecular composition of subretinal fluid (SRF) in central serous chorioretinopathy (CSCR) and rhegmatogenous retinal detachment (RRD) using proteomics and metabolomics. METHODS SRF was obtained from one patient with severe nonresolving bullous CSCR requiring surgical subretinal fibrin removal, and two patients with long-standing RRD. Proteins were trypsin-digested, labeled with Tandem-Mass-Tag and fractionated according to their isoelectric point for identification and quantification by tandem mass spectrometry. Independently, metabolites were extracted on cold methanol/ethanol, and identified by untargeted ultra-high performance liquid chromatography and high-resolution mass spectrometry. Bioinformatics analyses were conducted. RESULTS In total, 291 proteins and 651 metabolites were identified in SRF samples. Compared with RRD, 128 proteins (77 downregulated; 51 upregulated) and 76 metabolites (43 downregulated; 33 upregulated) differed in the SRF from CSCR. Protein and metabolites notably deregulated in CSCR were related to glycolysis/gluconeogenesis, inflammation (including serum amyloid P component, versican), alternative complement pathway (complement factor H and complement factor H-related protein), cellular adhesion, biliary acid metabolism (farnesoid X receptor/retinoid X receptor), and gluco- and mineralocorticoid systems (aldosterone, angiotensin, and corticosteroid-binding globulin). CONCLUSIONS Proteomics and metabolomics can be performed on SRF. A unique SRF sample from CSCR exhibited a distinct molecular profile compared with RRD. TRANSLATIONAL RELEVANCE This first comparative multiomics analysis of SRF improved the understanding of CSCR and RRD pathophysiology. It identified pathways potentially involved in the better photoreceptor preservation in CSCR, suggesting neuroprotective targets that will require additional confirmation.
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Affiliation(s)
- Laura Kowalczuk
- Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland
| | - Alexandre Matet
- Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland
| | - Marianne Dor
- OPTICS Laboratory, Department of Human Protein Science, University of Geneva, Geneva, Switzerland
| | | | - Alejandra Daruich
- Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland
| | - Ali Dirani
- Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland
| | - Francine Behar-Cohen
- Faculty of Biology and Medicine, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
- Inserm, U1138, Team 17, From physiopathology of ocular diseases to clinical development, Université Paris Descartes Sorbonne Paris Cité, Centre de Recherche des Cordeliers, Paris, France
| | - Aurélien Thomas
- Unit of Toxicology, CURML, Lausanne-Geneva, Switzerland
- Faculty of Biology and Medicine, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Natacha Turck
- OPTICS Laboratory, Department of Human Protein Science, University of Geneva, Geneva, Switzerland
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7
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Eandi CM, Charles Messance H, Augustin S, Dominguez E, Lavalette S, Forster V, Hu SJ, Siquieros L, Craft CM, Sahel JA, Tadayoni R, Paques M, Guillonneau X, Sennlaub F. Subretinal mononuclear phagocytes induce cone segment loss via IL-1β. eLife 2016; 5. [PMID: 27438413 PMCID: PMC4969036 DOI: 10.7554/elife.16490] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 07/19/2016] [Indexed: 12/19/2022] Open
Abstract
Photo-transduction in cone segments (CS) is crucial for high acuity daytime vision. For ill-defined reasons, CS degenerate in retinitis pigmentosa (RP) and in the transitional zone (TZ) of atrophic zones (AZ), which characterize geographic atrophy (GA). Our experiments confirm the loss of cone segments (CS) in the TZ of patients with GA and show their association with subretinal CD14+mononuclear phagocyte (MP) infiltration that is also reported in RP. Using human and mouse MPs in vitro and inflammation-prone Cx3cr1GFP/GFPmice in vivo, we demonstrate that MP-derived IL-1β leads to severe CS degeneration. Our results strongly suggest that subretinal MP accumulation participates in the observed pathological photoreceptor changes in these diseases. Inhibiting subretinal MP accumulation or Il-1β might protect the CS and help preserve high acuity daytime vision in conditions characterized by subretinal inflammation, such as AMD and RP. DOI:http://dx.doi.org/10.7554/eLife.16490.001
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Affiliation(s)
- Chiara M Eandi
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France.,Department of Clinical Science, University of Torino, Torino, Italy.,Eye Clinic, University of Torino, Torino, Italy
| | - Hugo Charles Messance
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Sébastien Augustin
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Elisa Dominguez
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Sophie Lavalette
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Valérie Forster
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Shulong Justin Hu
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Lourdes Siquieros
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Cheryl Mae Craft
- Mary D. Allen Laboratory for Vision Research, Keck School of Medicine of the University of Southern California, Los Angeles, United States.,University of Southern California Eye Institute, Keck School of Medicine of the University of Southern California, Los Angeles, United States.,Department of Ophthalmology and Cell, Keck School of Medicine of the University of Southern California, Los Angeles, United States.,Department of Neurobiology, Keck School of Medicine of the University of Southern California, Los Angeles, United States
| | - José-Alain Sahel
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France.,Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, INSERM-DHOS CIC 503, Paris, France
| | - Ramin Tadayoni
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France.,Department of Ophthalmology, Hôpital Lariboisièr, Paris, France
| | - Michel Paques
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France.,Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, INSERM-DHOS CIC 503, Paris, France
| | - Xavier Guillonneau
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
| | - Florian Sennlaub
- Sorbonne Universités, UPMC University Paris 06, INSERM, CNRS, Paris, France.,Institut de la Vision, Paris, France
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8
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Zhao PY, Gan G, Peng S, Wang SB, Chen B, Adelman RA, Rizzolo LJ. TRP Channels Localize to Subdomains of the Apical Plasma Membrane in Human Fetal Retinal Pigment Epithelium. Invest Ophthalmol Vis Sci 2015; 56:1916-23. [PMID: 25736794 DOI: 10.1167/iovs.14-15738] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
PURPOSE Calcium regulates many functions of the RPE. Its concentration in the subretinal space and RPE cytoplasm is closely regulated. Transient receptor potential (TRP) channels are a superfamily of ion channels that are moderately calcium-selective. This study investigates the subcellular localization and potential functions of TRP channels in a first-passage culture model of human fetal RPE (hfRPE). METHODS The RPE isolated from 15- to 16-week gestation fetuses were maintained in serum-free media. Cultures were treated with barium chloride (BaCl2) in the absence and presence of TRP channel inhibitors and monitored by the transepithelial electrical resistance (TER). The expression of TRP channels was determined using quantitative RT-PCR, immunoblotting, and immunofluorescence confocal microscopy. RESULTS Barium chloride substantially decreased TER and disrupted cell-cell contacts when added to the apical surface of RPE, but not when added to the basolateral surface. The effect could be partially blocked by the general TRP inhibitor, lanthanum chloride (LaCl3, ~75%), or an inhibitor of calpain (~25%). Family member-specific inhibitors, ML204 (TRPC4) and HC-067047 (TRPV4), had no effect on basal channel activity. Expression of TRPC4, TRPM1, TRPM3, TRPM7, and TRPV4 was detected by RT-PCR and immunoblotting. The TRPM3 localized to the base of the primary cilium, and TRPC4 and TRPM3 localized to apical tight junctions. The TRPV4 localized to apical microvilli in a small subset of cells. CONCLUSIONS The TRP channels localized to subdomains of the apical membrane, and BaCl2 was only able to dissociate tight junctions when presented to the apical membrane. The data suggest a potential role for TRP channels as sensors of [Ca(2+)] in the subretinal space.
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Affiliation(s)
- Peter Y Zhao
- Department of Surgery, Yale University, New Haven, Connecticut, United States
| | - Geliang Gan
- Department of Surgery, Yale University, New Haven, Connecticut, United States
| | - Shaomin Peng
- Department of Surgery, Yale University, New Haven, Connecticut, United States
| | - Shao-Bin Wang
- Department of Surgery, Yale University, New Haven, Connecticut, United States Department of Ophthalmology & Visual Science, Yale University, New Haven, Connecticut, United States
| | - Bo Chen
- Department of Ophthalmology & Visual Science, Yale University, New Haven, Connecticut, United States
| | - Ron A Adelman
- Department of Ophthalmology & Visual Science, Yale University, New Haven, Connecticut, United States
| | - Lawrence J Rizzolo
- Department of Surgery, Yale University, New Haven, Connecticut, United States Department of Ophthalmology & Visual Science, Yale University, New Haven, Connecticut, United States
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