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Lin F, Lin ST, Wang J, Geisert EE. Optimizing retinal ganglion cell nuclear staining for automated cell counting. Exp Eye Res 2024; 242:109881. [PMID: 38554800 DOI: 10.1016/j.exer.2024.109881] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/25/2024] [Accepted: 03/27/2024] [Indexed: 04/02/2024]
Abstract
The retinal ganglion cells (RGCs) serve as the critical pathway for transmitting visual information from the retina to the brain, yet they can be dramatically impacted by diseases such as glaucoma. When investigating disease processes affecting RGCs in mouse models, accurately quantifying affected cells becomes essential. However, the use of pan RGC markers like RBPMS or THY1 presents challenges in accurate total cell counting. While Brn3a serves as a reliable RGC nuclear marker for automated counting, it fails to encompass all RGC subtypes in mice. To address this limitation and enable precise automated counting, our research endeavors to develop a method for labeling nuclei in all RGC subtypes. Investigating RGC subtypes labeled with the nuclear marker POU6F2 revealed that numerous RGCs unlabeled by Brn3a were, in fact, labeled with POU6F2. We hypothesize that using antibodies against both Brn3a and POU6F2 would label virtually all RGC nuclei in the mouse retina. Our experiments confirmed that staining retinas with both markers resulted in the labeling of all RGCs. Additionally, when using the cell body marker RBPMS known to label all mouse RGCs, all RBPMS-labeled cells also exhibited Brn3a or POU6F2 labeling. This combination of Brn3a and POU6F2 antibodies provides a pan-RGC nuclear stain, facilitating accurate automated counting by labeling cell nuclei in the retina.
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Affiliation(s)
- Fangyu Lin
- Department of Ophthalmology, Emory University, 1365B Clifton Road NE, Atlanta, GA, 30322, USA
| | - Su-Ting Lin
- Department of Ophthalmology, Emory University, 1365B Clifton Road NE, Atlanta, GA, 30322, USA
| | - Jiaxing Wang
- Department of Ophthalmology, Emory University, 1365B Clifton Road NE, Atlanta, GA, 30322, USA
| | - Eldon E Geisert
- Department of Ophthalmology, Emory University, 1365B Clifton Road NE, Atlanta, GA, 30322, USA.
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2
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Cameron EG, Nahmou M, Toth AB, Heo L, Tanasa B, Dalal R, Yan W, Nallagatla P, Xia X, Hay S, Knasel C, Stiles TL, Douglas C, Atkins M, Sun C, Ashouri M, Bian M, Chang KC, Russano K, Shah S, Woodworth MB, Galvao J, Nair RV, Kapiloff MS, Goldberg JL. A molecular switch for neuroprotective astrocyte reactivity. Nature 2024; 626:574-582. [PMID: 38086421 DOI: 10.1038/s41586-023-06935-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 12/05/2023] [Indexed: 01/27/2024]
Abstract
The intrinsic mechanisms that regulate neurotoxic versus neuroprotective astrocyte phenotypes and their effects on central nervous system degeneration and repair remain poorly understood. Here we show that injured white matter astrocytes differentiate into two distinct C3-positive and C3-negative reactive populations, previously simplified as neurotoxic (A1) and neuroprotective (A2)1,2, which can be further subdivided into unique subpopulations defined by proliferation and differential gene expression signatures. We find the balance of neurotoxic versus neuroprotective astrocytes is regulated by discrete pools of compartmented cyclic adenosine monophosphate derived from soluble adenylyl cyclase and show that proliferating neuroprotective astrocytes inhibit microglial activation and downstream neurotoxic astrocyte differentiation to promote retinal ganglion cell survival. Finally, we report a new, therapeutically tractable viral vector to specifically target optic nerve head astrocytes and show that raising nuclear or depleting cytoplasmic cyclic AMP in reactive astrocytes inhibits deleterious microglial or macrophage cell activation and promotes retinal ganglion cell survival after optic nerve injury. Thus, soluble adenylyl cyclase and compartmented, nuclear- and cytoplasmic-localized cyclic adenosine monophosphate in reactive astrocytes act as a molecular switch for neuroprotective astrocyte reactivity that can be targeted to inhibit microglial activation and neurotoxic astrocyte differentiation to therapeutic effect. These data expand on and define new reactive astrocyte subtypes and represent a step towards the development of gliotherapeutics for the treatment of glaucoma and other optic neuropathies.
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Affiliation(s)
- Evan G Cameron
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA.
| | - Michael Nahmou
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Anna B Toth
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Lyong Heo
- Stanford Center for Genomics and Personalized Medicine, Stanford University, Palo Alto, CA, USA
| | - Bogdan Tanasa
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Roopa Dalal
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Wenjun Yan
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Pratima Nallagatla
- Stanford Center for Genomics and Personalized Medicine, Stanford University, Palo Alto, CA, USA
| | - Xin Xia
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Sarah Hay
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Cara Knasel
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | | | | | - Melissa Atkins
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Catalina Sun
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Masoumeh Ashouri
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Minjuan Bian
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Kun-Che Chang
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Kristina Russano
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Sahil Shah
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
- University of California, San Diego, La Jolla, CA, USA
| | - Mollie B Woodworth
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Joana Galvao
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Ramesh V Nair
- Stanford Center for Genomics and Personalized Medicine, Stanford University, Palo Alto, CA, USA
| | - Michael S Kapiloff
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA
- Department of Medicine and Stanford Cardiovascular Institute, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Jeffrey L Goldberg
- Mary M. and Sash A. Spencer Center for Vision Research, Byers Eye Institute, Stanford University School of Medicine, Palo Alto, CA, USA.
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Wang AYM, Kulkarni MM, McLaughlin AJ, Gayet J, Smith BE, Hauptschein M, McHugh CF, Yao YY, Puthussery T. An ON-type direction-selective ganglion cell in primate retina. Nature 2023; 623:381-386. [PMID: 37880369 PMCID: PMC10632142 DOI: 10.1038/s41586-023-06659-4] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 09/20/2023] [Indexed: 10/27/2023]
Abstract
To maintain a stable and clear image of the world, our eyes reflexively follow the direction in which a visual scene is moving. Such gaze-stabilization mechanisms reduce image blur as we move in the environment. In non-primate mammals, this behaviour is initiated by retinal output neurons called ON-type direction-selective ganglion cells (ON-DSGCs), which detect the direction of image motion and transmit signals to brainstem nuclei that drive compensatory eye movements1. However, ON-DSGCs have not yet been identified in the retina of primates, raising the possibility that this reflex is mediated by cortical visual areas. Here we mined single-cell RNA transcriptomic data from primate retina to identify a candidate ON-DSGC. We then combined two-photon calcium imaging, molecular identification and morphological analysis to reveal a population of ON-DSGCs in the macaque retina. The morphology, molecular signature and GABA (γ-aminobutyric acid)-dependent mechanisms that underlie direction selectivity in primate ON-DSGCs are highly conserved with those in other mammals. We further identify a candidate ON-DSGC in human retina. The presence of ON-DSGCs in primates highlights the need to examine the contribution of subcortical retinal mechanisms to normal and aberrant gaze stabilization in the developing and mature visual system.
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Affiliation(s)
- Anna Y M Wang
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
- Helen Wills Neuroscience Institute, Berkeley, CA, USA
| | - Manoj M Kulkarni
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
- Helen Wills Neuroscience Institute, Berkeley, CA, USA
| | - Amanda J McLaughlin
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
- Helen Wills Neuroscience Institute, Berkeley, CA, USA
| | - Jacqueline Gayet
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
- Helen Wills Neuroscience Institute, Berkeley, CA, USA
| | - Benjamin E Smith
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
- Vision Science Graduate Program, University of California, Berkeley, Berkeley, CA, USA
| | - Max Hauptschein
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
| | - Cyrus F McHugh
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
- Vision Science Graduate Program, University of California, Berkeley, Berkeley, CA, USA
| | - Yvette Y Yao
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA
| | - Teresa Puthussery
- Herbert Wertheim School of Optometry and Vision Science, Berkeley, CA, USA.
- Helen Wills Neuroscience Institute, Berkeley, CA, USA.
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Gudiseva HV, Vrathasha V, He J, Bungatavula D, O’Brien JM, Chavali VRM. Single Cell Sequencing of Induced Pluripotent Stem Cell Derived Retinal Ganglion Cells (iPSC-RGC) Reveals Distinct Molecular Signatures and RGC Subtypes. Genes (Basel) 2021; 12:2015. [PMID: 34946963 PMCID: PMC8702079 DOI: 10.3390/genes12122015] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 10/23/2021] [Revised: 12/13/2021] [Accepted: 12/15/2021] [Indexed: 02/04/2023] Open
Abstract
We intend to identify marker genes with differential gene expression (DEG) and RGC subtypes in cultures of human-induced pluripotent stem cell (iPSC)-derived retinal ganglion cells. Single-cell sequencing was performed on mature and functional iPSC-RGCs at day 40 using Chromium Single Cell 3' V3 protocols (10X Genomics). Sequencing libraries were run on Illumina Novaseq to generate 150 PE reads. Demultiplexed FASTQ files were mapped to the hg38 reference genome using the STAR package, and cluster analyses were performed using a cell ranger and BBrowser2 software. QC analysis was performed by removing the reads corresponding to ribosomal and mitochondrial genes, as well as cells that had less than 1X mean absolute deviation (MAD), resulting in 4705 cells that were used for further analyses. Cells were separated into clusters based on the gene expression normalization via PCA and TSNE analyses using the Seurat tool and/or Louvain clustering when using BBrowser2 software. DEG analysis identified subsets of RGCs with markers like MAP2, RBPMS, TUJ1, BRN3A, SOX4, TUBB3, SNCG, PAX6 and NRN1 in iPSC-RGCs. Differential expression analysis between separate clusters identified significant DEG transcripts associated with cell cycle, neuron regulatory networks, protein kinases, calcium signaling, growth factor hormones, and homeobox transcription factors. Further cluster refinement identified RGC diversity and subtype specification within iPSC-RGCs. DEGs can be used as biomarkers for RGC subtype classification, which will allow screening model systems that represent a spectrum of diseases with RGC pathology.
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Affiliation(s)
| | | | | | | | | | - Venkata R. M. Chavali
- Department of Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, PA 19104, USA; (H.V.G.); (V.V.); (J.H.); (D.B.)
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5
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Kingston R, Amin D, Misra S, Gross JM, Kuwajima T. Serotonin transporter-mediated molecular axis regulates regional retinal ganglion cell vulnerability and axon regeneration after nerve injury. PLoS Genet 2021; 17:e1009885. [PMID: 34735454 PMCID: PMC8594818 DOI: 10.1371/journal.pgen.1009885] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 11/16/2021] [Accepted: 10/17/2021] [Indexed: 11/19/2022] Open
Abstract
Molecular insights into the selective vulnerability of retinal ganglion cells (RGCs) in optic neuropathies and after ocular trauma can lead to the development of novel therapeutic strategies aimed at preserving RGCs. However, little is known about what molecular contexts determine RGC susceptibility. In this study, we show the molecular mechanisms underlying the regional differential vulnerability of RGCs after optic nerve injury. We identified RGCs in the mouse peripheral ventrotemporal (VT) retina as the earliest population of RGCs susceptible to optic nerve injury. Mechanistically, the serotonin transporter (SERT) is upregulated on VT axons after injury. Utilizing SERT-deficient mice, loss of SERT attenuated VT RGC death and led to robust retinal axon regeneration. Integrin β3, a factor mediating SERT-induced functions in other systems, is also upregulated in RGCs and axons after injury, and loss of integrin β3 led to VT RGC protection and axon regeneration. Finally, RNA sequencing analyses revealed that loss of SERT significantly altered molecular signatures in the VT retina after optic nerve injury, including expression of the transmembrane protein, Gpnmb. GPNMB is rapidly downregulated in wild-type, but not SERT- or integrin β3-deficient VT RGCs after injury, and maintaining expression of GPNMB in RGCs via AAV2 viruses even after injury promoted VT RGC survival and axon regeneration. Taken together, our findings demonstrate that the SERT-integrin β3-GPNMB molecular axis mediates selective RGC vulnerability and axon regeneration after optic nerve injury.
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Affiliation(s)
- Rody Kingston
- Department of Ophthalmology, The Louis J. Fox Center for Vision Restoration, Pittsburgh, Pennsylvania, United States of America
| | - Dwarkesh Amin
- Department of Ophthalmology, The Louis J. Fox Center for Vision Restoration, Pittsburgh, Pennsylvania, United States of America
| | - Sneha Misra
- Department of Ophthalmology, The Louis J. Fox Center for Vision Restoration, Pittsburgh, Pennsylvania, United States of America
| | - Jeffrey M. Gross
- Department of Ophthalmology, The Louis J. Fox Center for Vision Restoration, Pittsburgh, Pennsylvania, United States of America
- Department of Developmental Biology, The McGowan Institute for Regenerative Medicine, The University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States of America
| | - Takaaki Kuwajima
- Department of Ophthalmology, The Louis J. Fox Center for Vision Restoration, Pittsburgh, Pennsylvania, United States of America
- * E-mail:
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Herzog R, Morales A, Mora S, Araya J, Escobar MJ, Palacios AG, Cofré R. Scalable and accurate method for neuronal ensemble detection in spiking neural networks. PLoS One 2021; 16:e0251647. [PMID: 34329314 PMCID: PMC8323916 DOI: 10.1371/journal.pone.0251647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 04/29/2021] [Indexed: 11/19/2022] Open
Abstract
We propose a novel, scalable, and accurate method for detecting neuronal ensembles from a population of spiking neurons. Our approach offers a simple yet powerful tool to study ensemble activity. It relies on clustering synchronous population activity (population vectors), allows the participation of neurons in different ensembles, has few parameters to tune and is computationally efficient. To validate the performance and generality of our method, we generated synthetic data, where we found that our method accurately detects neuronal ensembles for a wide range of simulation parameters. We found that our method outperforms current alternative methodologies. We used spike trains of retinal ganglion cells obtained from multi-electrode array recordings under a simple ON-OFF light stimulus to test our method. We found a consistent stimuli-evoked ensemble activity intermingled with spontaneously active ensembles and irregular activity. Our results suggest that the early visual system activity could be organized in distinguishable functional ensembles. We provide a Graphic User Interface, which facilitates the use of our method by the scientific community.
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Affiliation(s)
- Rubén Herzog
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Arturo Morales
- Departamento de Electrónica, Universidad Técnica Federico Santa María, Valparaíso, Chile
| | - Soraya Mora
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
- Laboratorio de Biología Computacional, Fundación Ciencia y Vida, Santiago, Chile
| | - Joaquín Araya
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
- Escuela de Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Santiago, Chile
| | - María-José Escobar
- Departamento de Electrónica, Universidad Técnica Federico Santa María, Valparaíso, Chile
| | - Adrian G. Palacios
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Rodrigo Cofré
- CIMFAV Ingemat, Facultad de Ingeniería, Universidad de Valparaíso, Valparaíso, Chile
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Abstract
People are constantly exposed to blue light while engaging in work. It is thus crucial to understand if vast exposure to blue light influences cognitive control, which is essential for working efficiently. Previous studies proposed that the stimulation of intrinsically photosensitive retinal ganglion cells (ipRGCs), a newly discovered photoreceptor that is highly sensitive to blue light, could modulate non-image forming functions. Despite studies that showed blue light (or ipRGCs) enhances brain activations in regions related to cognitive control, how exposure to blue light changes our cognitive control behaviorally remains elusive. We examined whether blue light influences cognitive control through three behavioral tasks in three studies: the sustained attention to response task (SART), the task-switching paradigm, and the Stroop task. Classic effects of the SART, switch cost, and the Stroop effect were found, but no differences were observed in results of different background lights across the six experiments. Together, we conclude that these domains of cognitive control are not influenced by blue light and ipRGCs, and whether the enhancement of blue light on brain activities extends to the behavioral level should be carefully re-examined.
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Affiliation(s)
- Hsing-Hao Lee
- Department of Psychology, National Taiwan University, Taipei, Taiwan
| | - Yun-Chen Tu
- Department of Psychology, National Taiwan University, Taipei, Taiwan
| | - Su-Ling Yeh
- Department of Psychology, National Taiwan University, Taipei, Taiwan.
- Graduate Institute of Brain and Mind Sciences, National Taiwan University, Taipei, Taiwan.
- Neurobiology and Cognitive Science Center, National Taiwan University, Taipei, Taiwan.
- Center for Artificial Intelligence and Advanced Robotics, National Taiwan University, Taipei, Taiwan.
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Abstract
Retinal ganglion cells (RGCs) are thought to be strictly postsynaptic within the retina. They carry visual signals from the eye to the brain, but do not make chemical synapses onto other retinal neurons. Nevertheless, they form gap junctions with other RGCs and amacrine cells, providing possibilities for RGC signals to feed back into the inner retina. Here we identified such feedback circuitry in the salamander and mouse retinas. First, using biologically inspired circuit models, we found mutual inhibition among RGCs of the same type. We then experimentally determined that this effect is mediated by gap junctions with amacrine cells. Finally, we found that this negative feedback lowers RGC visual response gain without affecting feature selectivity. The principal neurons of the retina therefore participate in a recurrent circuit much as those in other brain areas, not being a mere collector of retinal signals, but are actively involved in visual computations.
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Affiliation(s)
- Anastasiia Vlasiuk
- Epigenetics and Neurobiology Unit, EMBL Rome, European Molecular Biology Laboratory, Monterotondo, Rome, Italy
- Collaboration for joint PhD degree between EMBL and Heidelberg University, Faculty of Biosciences, Heidelberg, Germany
| | - Hiroki Asari
- Epigenetics and Neurobiology Unit, EMBL Rome, European Molecular Biology Laboratory, Monterotondo, Rome, Italy
- * E-mail:
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Affiliation(s)
- Vittorio Sebastiano
- From the Institute for Stem Cell Biology and Regenerative Medicine and the Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA (V.S.); and the Wilmer Eye Institute, the Departments of Ophthalmology, Molecular Biology and Genetics, Neuroscience, and Human Genetics, and the Center for Nanomedicine, Johns Hopkins University School of Medicine, Baltimore (D.J.Z.)
| | - Donald J Zack
- From the Institute for Stem Cell Biology and Regenerative Medicine and the Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA (V.S.); and the Wilmer Eye Institute, the Departments of Ophthalmology, Molecular Biology and Genetics, Neuroscience, and Human Genetics, and the Center for Nanomedicine, Johns Hopkins University School of Medicine, Baltimore (D.J.Z.)
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10
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Abstract
Retinal ganglion cells (RGCs) are the only projection neurons in the neural retina. They receive and integrate visual signals from upstream retinal neurons in the visual circuitry and transmit them to the brain. The function of RGCs is performed by the approximately 40 RGC types projecting to various central brain targets. RGCs are the first cell type to form during retinogenesis. The specification and differentiation of the RGC lineage is a stepwise process; a hierarchical gene regulatory network controlling the RGC lineage has been identified and continues to be elaborated. Recent studies with single-cell transcriptomics have led to unprecedented new insights into their types and developmental trajectory. In this review, we summarize our current understanding of the functions and relationships of the many regulators of the specification and differentiation of the RGC lineage. We emphasize the roles of these key transcription factors and pathways in different developmental steps, including the transition from retinal progenitor cells (RPCs) to RGCs, RGC differentiation, generation of diverse RGC types, and central projection of the RGC axons. We discuss critical issues that remain to be addressed for a comprehensive understanding of these different aspects of RGC genesis and emerging technologies, including single-cell techniques, novel genetic tools and resources, and high-throughput genome editing and screening assays, which can be leveraged in future studies.
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Affiliation(s)
- Jianyi Lyu
- Department of Ophthalmology/Ross Eye Institute, State University of New York At Buffalo, Buffalo, NY, 14203, USA
- School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China
| | - Xiuqian Mu
- Department of Ophthalmology/Ross Eye Institute, State University of New York At Buffalo, Buffalo, NY, 14203, USA.
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11
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Harrison KR, Chervenak AP, Resnick SM, Reifler AN, Wong KY. Amacrine Cells Forming Gap Junctions With Intrinsically Photosensitive Retinal Ganglion Cells: ipRGC Types, Neuromodulator Contents, and Connexin Isoform. Invest Ophthalmol Vis Sci 2021; 62:10. [PMID: 33410914 PMCID: PMC7804497 DOI: 10.1167/iovs.62.1.10] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 09/14/2020] [Accepted: 11/30/2020] [Indexed: 12/11/2022] Open
Abstract
Purpose Intrinsically photosensitive retinal ganglion cells (ipRGCs) signal not only centrally to non-image-forming visual centers of the brain but also intraretinally to amacrine interneurons through gap junction electrical coupling, potentially modulating image-forming retinal processing. We aimed to determine (1) which ipRGC types couple with amacrine cells, (2) the neuromodulator contents of ipRGC-coupled amacrine cells, and (3) whether connexin36 (Cx36) contributes to ipRGC-amacrine coupling. Methods Gap junction-permeable Neurobiotin tracer was injected into green fluorescent protein (GFP)-labeled ipRGCs in Opn4Cre/+; Z/EG mice to stain coupled amacrine cells, and immunohistochemistry was performed to reveal the neuromodulator contents of the Neurobiotin-stained amacrine cells. We also created Opn4Cre/+; Cx36flox/flox; Z/EG mice to knock out Cx36 in GFP-labeled ipRGCs and looked for changes in the number of ipRGC-coupled amacrine cells. Results Seventy-three percent of ipRGCs, including all six types (M1-M6), were tracer-coupled with amacrine somas 5.7 to 16.5 µm in diameter but not with ganglion cells. Ninety-two percent of the ipRGC-coupled somas were in the ganglion cell layer and the rest in the inner nuclear layer. Some ipRGC-coupled amacrine cells were found to accumulate serotonin or to contain nitric oxide synthase or neuropeptide Y. Knocking out Cx36 in M2 and M4 dramatically reduced the number of coupled somas. Conclusions Heterologous gap junction coupling with amacrine cells is widespread across mouse ipRGC types. ipRGC-coupled amacrine cells probably comprise multiple morphologic types and use multiple neuromodulators, suggesting that gap junctional ipRGC-to-amacrine signaling likely exerts diverse modulatory effects on retinal physiology. ipRGC-amacrine coupling is mediated partly, but not solely, by Cx36.
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Affiliation(s)
- Krystal R. Harrison
- Department of Molecular, Cellular, & Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States
| | - Andrew P. Chervenak
- Department of Ophthalmology & Visual Sciences, University of Michigan, Ann Arbor, Michigan, United States
| | - Sarah M. Resnick
- Department of Ophthalmology & Visual Sciences, University of Michigan, Ann Arbor, Michigan, United States
| | - Aaron N. Reifler
- Department of Ophthalmology & Visual Sciences, University of Michigan, Ann Arbor, Michigan, United States
| | - Kwoon Y. Wong
- Department of Molecular, Cellular, & Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States
- Department of Ophthalmology & Visual Sciences, University of Michigan, Ann Arbor, Michigan, United States
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Bürger S, Meng J, Zwanzig A, Beck M, Pankonin M, Wiedemann P, Eichler W, Unterlauft JD. Pigment Epithelium-Derived Factor (PEDF) Receptors Are Involved in Survival of Retinal Neurons. Int J Mol Sci 2020; 22:E369. [PMID: 33396450 PMCID: PMC7795132 DOI: 10.3390/ijms22010369] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 12/11/2020] [Revised: 12/25/2020] [Accepted: 12/28/2020] [Indexed: 02/02/2023] Open
Abstract
The demise of retinal ganglion cells (RGCs) is characteristic of diseases of the retina such as glaucoma and diabetic or ischemic retinopathies. Pigment epithelium-derived factor (PEDF) is a multifunctional secreted protein that mediates neuroprotection and inhibition of angiogenesis in the retina. We have studied expression and regulation of two of several receptors for PEDF, patatin-like phospholipase 2 gene product/PEDF-R and laminin receptor (LR), in serum-starved RGC under normoxia and hypoxia and investigated their involvement in the survival of retinal neuronal cells. We show that PEDF-R and LR are co-expressed in RGC and R28 retinal precursor cells. Expression of both receptors was enhanced in the presence of complex secretions from retinal glial (Müller) cells and upregulated by VEGF and under hypoxic conditions. PEDF-R- and LR-knocked-down cells demonstrated a markedly attenuated expression of anti-apoptotic Bcl-2 family members (Bcl-2, Bcl-xL) and neuroprotective mediators (PEDF, VEGF, BDNF) suggesting that both PEDF-R and LR mediate pro-survival effects of PEDF on RGC. While this study does not provide evidence for a differential survival-promoting influence of either PEDF-R or LR, it nevertheless highlights the importance of both PEDF receptors for the viability of retinal neurons.
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Affiliation(s)
| | | | | | | | | | | | - Wolfram Eichler
- Department of Ophthalmology and Eye Hospital, Leipzig University, Liebigstrasse 10-14, D-04103 Leipzig, Germany; (S.B.); (J.M.); (A.Z.); (M.B.); (M.P.); (P.W.); (J.D.U.)
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13
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Pereiro X, Ruzafa N, Urcola JH, Sharma SC, Vecino E. Differential Distribution of RBPMS in Pig, Rat, and Human Retina after Damage. Int J Mol Sci 2020; 21:ijms21239330. [PMID: 33297577 PMCID: PMC7729751 DOI: 10.3390/ijms21239330] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 10/27/2020] [Revised: 11/25/2020] [Accepted: 12/03/2020] [Indexed: 12/24/2022] Open
Abstract
RNA binding protein with multiple splicing (RBPMS) is expressed exclusively in retinal ganglion cells (RGCs) in the retina and can label all RGCs in normal retinas of mice, rats, guinea pigs, rabbits, cats, and monkeys, but its function in these cells is not known. As a result of the limited knowledge regarding RBPMS, we analyzed the expression of RBPMS in the retina of different mammalian species (humans, pigs, and rats), in various stages of development (neonatal and adult) and with different levels of injury (control, hypoxia, and organotypic culture or explants). In control conditions, RBPMS was localized in the RGCs somas in the ganglion cell layer, whereas in hypoxic conditions, it was localized in the RGCs dendrites in the inner plexiform layer. Such differential distributions of RBPMS occurred in all analyzed species, and in adult and neonatal retinas. Furthermore, we demonstrate RBPMS localization in the degenerating RGCs axons in the nerve fiber layer of retinal explants. This is the first evidence regarding the possible transport of RBPMS in response to physiological damage in a mammalian retina. Therefore, RBPMS should be further investigated in relation to its role in axonal and dendritic degeneration.
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Affiliation(s)
- Xandra Pereiro
- Department of Cell Biology and Histology, Experimental Ophthalmo-Biology Group (GOBE), University of the Basque Country UPV/EHU, 48940 Leioa, Vizcaya, Spain; (X.P.); (N.R.); (J.H.U.); (S.C.S.)
| | - Noelia Ruzafa
- Department of Cell Biology and Histology, Experimental Ophthalmo-Biology Group (GOBE), University of the Basque Country UPV/EHU, 48940 Leioa, Vizcaya, Spain; (X.P.); (N.R.); (J.H.U.); (S.C.S.)
| | - J. Haritz Urcola
- Department of Cell Biology and Histology, Experimental Ophthalmo-Biology Group (GOBE), University of the Basque Country UPV/EHU, 48940 Leioa, Vizcaya, Spain; (X.P.); (N.R.); (J.H.U.); (S.C.S.)
- Department of Ophthalmology, Araba University Hospital, 01009 Vitoria, Alava, Spain
| | - Sansar C. Sharma
- Department of Cell Biology and Histology, Experimental Ophthalmo-Biology Group (GOBE), University of the Basque Country UPV/EHU, 48940 Leioa, Vizcaya, Spain; (X.P.); (N.R.); (J.H.U.); (S.C.S.)
- Department of Anatomy and Cell Biology, New York Medical College, Valhalla, NY 10595, USA
| | - Elena Vecino
- Department of Cell Biology and Histology, Experimental Ophthalmo-Biology Group (GOBE), University of the Basque Country UPV/EHU, 48940 Leioa, Vizcaya, Spain; (X.P.); (N.R.); (J.H.U.); (S.C.S.)
- Correspondence:
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Vera MS, Simón MV, Prado Spalm FH, Ayala-Peña VB, German OL, Politi LE, Santiago Valtierra FX, Rotstein NP. Ceramide-1-phosphate promotes the migration of retina Müller glial cells. Exp Eye Res 2020; 202:108359. [PMID: 33197453 DOI: 10.1016/j.exer.2020.108359] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 09/08/2020] [Revised: 10/30/2020] [Accepted: 11/07/2020] [Indexed: 12/13/2022]
Abstract
Müller glial cells, the major glial cell type in the retina, are activated by most retina injuries, leading to an increased proliferation and migration that contributes to visual dysfunction. The molecular cues involved in these processes are still ill defined. We demonstrated that sphingosine-1-phosphate (S1P), a bioactive sphingolipid, promotes glial migration. We now investigated whether ceramide-1-phosphate (C1P), also a bioactive sphingolipid, was involved in Müller glial cell migration. We evaluated cell migration in primary Müller glial cultures, prepared from newborn rat retinas, by the scratch wound assay. Addition of either 10 μM C8-ceramide-1-phosphate (C8-C1P) or 5 μM C16-C1P (a long chain, natural C1P) stimulated glial migration. Inhibiting PI3K almost completely blocked C8-C1P-elicited migration whereas inhibition of ERK1-2/MAPK pathway diminished it and p38MAPK inhibition did not affect it. Pre-treatment with a cytoplasmic phospholipase A2 (cPLA2) inhibitor markedly reduced C8-C1P-induced migration. Inhibiting ceramide kinase (CerK), the enzyme catalyzing C1P synthesis, partially decreased glial migration. Combined addition of S1P and C8-C1P promoted glial migration to the same extent as when they were added separately, suggesting they converge on their downstream signaling to stimulate Müller glia migration. These results suggest that C1P addition stimulated migration of glial Müller cells, promoting the activation of cPLA2, and the PI3K and ERK/MAPK pathways. They also suggest that CerK-dependent C1P synthesis was one of the factors contributing to glial migration, thus uncovering a novel role for C1P in controlling glial motility.
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Affiliation(s)
- Marcela S Vera
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - M Victoria Simón
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - Facundo H Prado Spalm
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - Victoria B Ayala-Peña
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - O Lorena German
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - Luis E Politi
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - Florencia X Santiago Valtierra
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina
| | - Nora P Rotstein
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB), Dept. of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur (UNS) and National Research Council of Argentina (CONICET), Bahía Blanca, Buenos Aires, Argentina.
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15
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Soto F, Tien NW, Goel A, Zhao L, Ruzycki PA, Kerschensteiner D. AMIGO2 Scales Dendrite Arbors in the Retina. Cell Rep 2020; 29:1568-1578.e4. [PMID: 31693896 PMCID: PMC6871773 DOI: 10.1016/j.celrep.2019.09.085] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 03/13/2019] [Revised: 08/21/2019] [Accepted: 09/27/2019] [Indexed: 12/24/2022] Open
Abstract
The size of dendrite arbors shapes their function and differs vastly between neuron types. The signals that control
dendritic arbor size remain obscure. Here, we find that in the retina, starburst amacrine cells (SACs) and rod bipolar cells
(RBCs) express the homophilic cell-surface protein AMIGO2. In Amigo2 knockout (KO) mice, SAC and RBC dendrites
expand while arbors of other retinal neurons remain stable. SAC dendrites are divided into a central input region and a peripheral
output region that provides asymmetric inhibition to direction-selective ganglion cells (DSGCs). Input and output compartments
scale precisely with increased arbor size in Amigo2 KO mice, and SAC dendrites maintain asymmetric connectivity
with DSGCs. Increased coverage of SAC dendrites is accompanied by increased direction selectivity of DSGCs without changes to
other ganglion cells. Our results identify AMIGO2 as a cell-type-specific dendritic scaling factor and link dendrite size and
coverage to visual feature detection. Soto et al. find that two retinal interneurons express the cell-surface protein AMIGO2. Deletion of Amigo2
causes dendrites of these neurons, but not others, to expand, preserving branching patterns and connectivity. Increased
interneuron dendrite coverage is accompanied by enhanced response selectivity of retinal output neurons.
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Affiliation(s)
- Florentina Soto
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Saint Louis, MO 63110, USA.
| | - Nai-Wen Tien
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Saint Louis, MO 63110, USA; Graduate Program in Neuroscience, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Anurag Goel
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Lei Zhao
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Philip A Ruzycki
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Daniel Kerschensteiner
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Saint Louis, MO 63110, USA; Department of Neuroscience, Washington University School of Medicine, Saint Louis, MO 63110, USA; Department of Biomedical Engineering, Washington University School of Medicine, Saint Louis, MO 63110, USA; Hope Center for Neurological Disorders, Washington University School of Medicine, Saint Louis, MO 63110, USA.
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16
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Pereiro X, Miltner AM, La Torre A, Vecino E. Effects of Adult Müller Cells and Their Conditioned Media on the Survival of Stem Cell-Derived Retinal Ganglion Cells. Cells 2020; 9:E1759. [PMID: 32708020 PMCID: PMC7465792 DOI: 10.3390/cells9081759] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 06/05/2020] [Revised: 07/13/2020] [Accepted: 07/15/2020] [Indexed: 12/16/2022] Open
Abstract
Retinal neurons, particularly retinal ganglion cells (RGCs), are susceptible to the degenerative damage caused by different inherited conditions and environmental insults, leading to irreversible vision loss and, ultimately, blindness. Numerous strategies are being tested in different models of degeneration to restore vision and, in recent years, stem cell technologies have offered novel avenues to obtain donor cells for replacement therapies. To date, stem cell-based transplantation in the retina has been attempted as treatment for photoreceptor degeneration, but the same tools could potentially be applied to other retinal cell types, including RGCs. However, RGC-like cells are not an abundant cell type in stem cell-derived cultures and, often, these cells degenerate over time in vitro. To overcome this limitation, we have taken advantage of the neuroprotective properties of Müller glia (one of the main glial cell types in the retina) and we have examined whether Müller glia and the factors they secrete could promote RGC-like cell survival in organoid cultures. Accordingly, stem cell-derived RGC-like cells were co-cultured with adult Müller cells or Müller cell-conditioned media was added to the cultures. Remarkably, RGC-like cell survival was substantially enhanced in both culture conditions, and we also observed a significant increase in their neurite length. Interestingly, Atoh7, a transcription factor required for RGC development, was up-regulated in stem cell-derived organoids exposed to conditioned media, suggesting that Müller cells may also enhance the survival of retinal progenitors and/or postmitotic precursor cells. In conclusion, Müller cells and the factors they release promote organoid-derived RGC-like cell survival, neuritogenesis, and possibly neuronal maturation.
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Affiliation(s)
- Xandra Pereiro
- Department of Cell Biology and Histology, University of Basque Country UPV/EHU, Leioa, 48940 Vizcaya, Spain;
| | - Adam M. Miltner
- Department of Cell Biology and Human Anatomy, University of California Davis, Davis, CA 95616, USA; (A.M.M.); (A.L.T.)
| | - Anna La Torre
- Department of Cell Biology and Human Anatomy, University of California Davis, Davis, CA 95616, USA; (A.M.M.); (A.L.T.)
| | - Elena Vecino
- Department of Cell Biology and Histology, University of Basque Country UPV/EHU, Leioa, 48940 Vizcaya, Spain;
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Zhang Q, He C, Li R, Ke Y, Sun K, Wang J. miR-708 and miR-335-3p Inhibit the Apoptosis of Retinal Ganglion Cells Through Suppressing Autophagy. J Mol Neurosci 2020; 71:284-292. [PMID: 32683666 DOI: 10.1007/s12031-020-01648-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 04/26/2020] [Accepted: 06/22/2020] [Indexed: 11/26/2022]
Abstract
This study aimed to clarify the regulation role of miR-708 and miR-335-3p in retinal ganglion cell (RGC) autophagy and apoptosis in glaucoma. Chronic glaucoma mice were established by laser photocoagulation. RGCs were isolated and transfected with a series of plasmids and the cultured in 60 mmHg pressure. miR-335-3p, miR-708, and ATG3 mRNA expressions were detected by qRT-PCR. Protein levels of ATG3, autophagy-related protein LC3, and p62 were detected by Western blot. The apoptosis of RGCs was detected by flow cytometry. The regulation role of miR-335-3p/miR-708 in ATG3 was confirmed by the dual-luciferase reporter gene. The expressions of several miRNAs were measured in retinal tissues from chronic glaucoma mice and RGCs under pressure conditions, and results showed that both miR-335-3p and miR-708 were down-regulated. Besides, the inhibition of miR-708 and miR-335-3p induced the apoptosis of RGCs through promoting autophagy. Also, miR-708 and miR-335-3p could bind to ATG3 and targeted regulated ATG3. Furthermore, the interference with miR-708/miR-335-3p induced RGC apoptosis by up-regulating ATG3 to promote autophagy. In general, the down-regulation of miR-708 and miR-335-3p contributed to the apoptosis of RGCs through promoting autophagy in glaucoma.
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Affiliation(s)
- Qiuli Zhang
- Department of Ophthalmology, Affiliated Hospital of Guangdong Medical University, No.57, South Renmin Avenue, Zhanjiang, 524001, Guangdong Province, China.
| | - Chang He
- Department of Genetics, College of Basic Medical Sciences, Jilin University, Changchun, 130021, Jilin, China
| | - Ruizhuang Li
- Department of Ophthalmology, Affiliated Hospital of Guangdong Medical University, No.57, South Renmin Avenue, Zhanjiang, 524001, Guangdong Province, China
| | - Yi Ke
- Department of Ophthalmology, Affiliated Hospital of Guangdong Medical University, No.57, South Renmin Avenue, Zhanjiang, 524001, Guangdong Province, China
| | - Kaidi Sun
- Department of Ophthalmology, Affiliated Hospital of Inner Mongolia University for the Nationalities, Tongliao, 028007, Inner Mongolia, China
| | - Jiaqi Wang
- Department of Ophthalmology, Affiliated Hospital of Inner Mongolia University for the Nationalities, Tongliao, 028007, Inner Mongolia, China
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DeLawyer T, Tsujimura SI, Shinomori K. Relative contributions of melanopsin to brightness discrimination when hue and luminance also vary. J Opt Soc Am A Opt Image Sci Vis 2020; 37:A81-A88. [PMID: 32400519 DOI: 10.1364/josaa.382349] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 01/13/2020] [Indexed: 06/11/2023]
Abstract
A large number of studies have shown the effect of melanopsin-dependent retinal ganglion cells on humans performing brightness discrimination tasks. These studies often utilized targets that only differ in their melanopsin activation levels, and not in their luminance or hue, which are both factors that make large contributions to brightness discrimination. The purpose of the present study was to evaluate the relative contribution of melanopsin activation to brightness discrimination when luminance and hue are also varying in addition to melanopsin activation. Using an apparatus consisting of three separate high luminance projectors, we were able to manipulate melanopsin-isolating stimulation, and L-, M-, and S-cone stimulation separately, thus allowing us to vary stimuli in their melanopsin activation, luminance, and hue category independently. We constructed three sets of target stimuli with three different levels of melanopsin activation (100%, 131%, and 167% relative melanopsin excitation) and five levels of luminance. We then had subjects do a two-alternative forced choice task where they compared the previously described target stimuli set to a set of four comparison stimuli that varied in their hue category but had identical luminances. We found that in our stimuli set the overall contribution of melanopsin activity to brightness discrimination was small (an average of 6% increase in likelihood to call a high melanopsin activity stimulus brighter compared to a low melanopsin activity stimulus) when luminance and hue also varied. However, a significant interaction showed that when the comparison was between stimuli differing only in melanopsin stimulation (with luminance and hue unchanged) the contribution of melanopsin to brightness judgments was about 3 times larger (an average of 18% increase in likelihood to call a high melanopsin activity stimulus brighter compared to a low melanopsin activity stimulus). This suggests that although luminance and hue have large effects on brightness discrimination such that the melanopsin contribution can become hard to detect, when there are minimal cone-dependent signals available, melanopsin can make a large contribution to brightness discrimination.
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Sonoda T, Okabe Y, Schmidt TM. Overlapping morphological and functional properties between M4 and M5 intrinsically photosensitive retinal ganglion cells. J Comp Neurol 2020; 528:1028-1040. [PMID: 31691279 PMCID: PMC7007370 DOI: 10.1002/cne.24806] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 10/24/2019] [Accepted: 10/30/2019] [Indexed: 02/03/2023]
Abstract
Multiple retinal ganglion cell (RGC) types in the mouse retina mediate pattern vision by responding to specific features of the visual scene. The M4 and M5 melanopsin-expressing, intrinsically photosensitive retinal ganglion cell (ipRGC) subtypes are two RGC types that are thought to play major roles in pattern vision. The M4 ipRGCs overlap in population with ON-alpha RGCs, while M5 ipRGCs were recently reported to exhibit opponent responses to different wavelengths of light (color opponency). Despite their seemingly distinct roles in visual processing, previous reports have suggested that these two populations may exhibit overlap in their morphological and functional properties, which calls into question whether these are in fact distinct RGC types. Here, we show that M4 and M5 ipRGCs are distinct morphological classes of ipRGCs, but they cannot be exclusively differentiated based on color opponency and dendritic morphology as previously reported. Instead, we find that M4 and M5 ipRGCs can only be distinguished based on soma size and the number of dendritic branch points in combination with SMI-32 immunoreactivity. These results have important implications for clearly defining RGC types and their roles in visual behavior.
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Affiliation(s)
- Takuma Sonoda
- Department of Neurobiology, Northwestern University, Evanston, IL, USA
- Northwestern University Interdepartmental Neuroscience Program, Northwestern University, Chicago, IL, USA
| | - Yudai Okabe
- Department of Neurobiology, Northwestern University, Evanston, IL, USA
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20
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Lee J, Kim YK, Ha A, Sun S, Kim YW, Kim JS, Jeoung JW, Park KH. Macular Ganglion Cell-Inner Plexiform Layer Thickness Prediction from Red-free Fundus Photography using Hybrid Deep Learning Model. Sci Rep 2020; 10:3280. [PMID: 32094401 PMCID: PMC7039950 DOI: 10.1038/s41598-020-60277-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 10/02/2019] [Accepted: 02/09/2020] [Indexed: 12/15/2022] Open
Abstract
We developed a hybrid deep learning model (HDLM) algorithm that quantitatively predicts macular ganglion cell-inner plexiform layer (mGCIPL) thickness from red-free retinal nerve fiber layer photographs (RNFLPs). A total of 789 pairs of RNFLPs and spectral domain-optical coherence tomography (SD-OCT) scans for 431 eyes of 259 participants (183 eyes of 114 healthy controls, 68 eyes of 46 glaucoma suspects, and 180 eyes of 99 glaucoma patients) were enrolled. An HDLM was built by combining a pre-trained deep learning network and support vector machine. The correlation coefficient and mean absolute error (MAE) between the predicted and measured mGCIPL thicknesses were calculated. The measured (OCT-based) and predicted (HDLM-based) average mGCIPL thicknesses were 73.96 ± 8.81 µm and 73.92 ± 7.36 µm, respectively (P = 0.844). The predicted mGCIPL thickness showed a strong correlation and good agreement with the measured mGCIPL thickness (Correlation coefficient r = 0.739; P < 0.001; MAE = 4.76 µm). Even when the peripapillary area (diameter: 1.5 disc diameters) was masked, the correlation (r = 0.713; P < 0.001) and agreement (MAE = 4.87 µm) were not changed significantly (P = 0.378 and 0.724, respectively). The trained HDLM algorithm showed a great capability for mGCIPL thickness prediction from RNFLPs.
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Affiliation(s)
- Jinho Lee
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
- Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
| | - Young Kook Kim
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
- Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea.
| | - Ahnul Ha
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
- Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
| | - Sukkyu Sun
- Interdisciplinary Program, Bioengineering Major, Graduate School, Seoul National University, Seoul, Korea
| | - Yong Woo Kim
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
- Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
| | - Jin-Soo Kim
- Department of Ophthalmology, Hallym University Chuncheon Sacred Heart Hospital, Chuncheon, Korea
| | - Jin Wook Jeoung
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
- Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
| | - Ki Ho Park
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
- Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
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21
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Venugopalan P, Cameron EG, Zhang X, Nahmou M, Muller KJ, Goldberg JL. Physiologic maturation is both extrinsically and intrinsically regulated in progenitor-derived neurons. Sci Rep 2020; 10:2337. [PMID: 32047174 PMCID: PMC7012889 DOI: 10.1038/s41598-020-58120-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 09/29/2016] [Accepted: 01/03/2020] [Indexed: 12/15/2022] Open
Abstract
During development, newly-differentiated neurons undergo several morphological and physiological changes to become functional, mature neurons. Physiologic maturation of neuronal cells derived from isolated stem or progenitor cells may provide insight into maturation in vivo but is not well studied. As a step towards understanding how neuronal maturation is regulated, we studied the developmental switch of response to the neurotransmitter GABA, from excitatory depolarization to inhibitory hyperpolarization. We compared acutely isolated retinal ganglion cells (RGCs) at various developmental stages and RGCs differentiated in vitro from embryonic retinal progenitors for the effects of aging and, independently, of retinal environment age on their GABAA receptor (GABAAR) responses, elicited by muscimol. We found that neurons generated in vitro from progenitors exhibited depolarizing, immature GABA responses, like those of early postnatal RGCs. As progenitor-derived neurons aged from 1 to 3 weeks, their GABA responses matured. Interestingly, signals secreted by the early postnatal retina suppressed acquisition of mature GABA responses. This suppression was not associated with changes in expression of GABAAR or of the chloride co-transporter KCC2, but rather with inhibition of KCC2 dimerization in differentiating neurons. Taken together, these data indicate GABA response maturation depends on release of inhibition by developmentally regulated diffusible signals from the retina.
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Affiliation(s)
- Praseeda Venugopalan
- Neuroscience Program, University of Miami, Miami, FL, 33136, USA
- Shiley Eye Institute, University of California, San Diego, CA, 92093, USA
| | - Evan G Cameron
- Shiley Eye Institute, University of California, San Diego, CA, 92093, USA
- Byers Eye Institute, Stanford University, Stanford, CA, 94303, USA
| | - Xiong Zhang
- Shiley Eye Institute, University of California, San Diego, CA, 92093, USA
| | - Michael Nahmou
- Byers Eye Institute, Stanford University, Stanford, CA, 94303, USA
| | - Kenneth J Muller
- Neuroscience Program, University of Miami, Miami, FL, 33136, USA.
- Department of Physiology & Biophysics, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
| | - Jeffrey L Goldberg
- Neuroscience Program, University of Miami, Miami, FL, 33136, USA.
- Shiley Eye Institute, University of California, San Diego, CA, 92093, USA.
- Byers Eye Institute, Stanford University, Stanford, CA, 94303, USA.
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Abstract
The stereotypic dendritic morphology is one of the landmark characteristics for classifying retinal ganglion cell (RGC) subtypes. These unique dendritic morphologies and their corresponding stratification level in the inner plexiform layer are indicators of their physiological function and presynaptic connection with other neurons. Mis-patterned dendritic morphologies underlie many neurological disease conditions. To streamline the morphological analysis of RGCs, here, we describe a simple protocol using Cre-/lox-dependent genetically directed sparse labeling strategy on flat-mounted retinas to inspect dendritic morphology of specific RGC subtypes.
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Affiliation(s)
- Leila Jamal
- Ruiz Department of Ophthalmology and Visual Science, McGovern Medical School at The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
- Biological Sciences (Neurobiology, Physiology, and Behavior), College of Liberal Arts and Sciences at Arizona State University, Tempe, AZ, USA
| | - Takae Kiyama
- Ruiz Department of Ophthalmology and Visual Science, McGovern Medical School at The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
| | - Chai-An Mao
- Ruiz Department of Ophthalmology and Visual Science, McGovern Medical School at The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA.
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23
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Abstract
Retinal ganglion cell (RGC) axons extend along the inner limiting membrane, which forms the extracellular matrix (ECM) containing laminin, collagen, and proteoglycans. RGC axons express integrin, which is activated by binding to ECM proteins to regulate cytoskeleton. To study the growth of RGC axons in vitro, maintaining the natural environment for them is absolutely necessary. For this purpose, culturing a strip of embryonic chick retina in Matrigel® is a suitable method. This article describes detailed techniques of the retinal strip culture.
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Affiliation(s)
- Masayuki Yamashita
- Center for Basic Medical Research, International University of Health and Welfare, Ohtawara, Japan.
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24
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Ly A, Banh J, Luu P, Huang J, Yapp M, Zangerl B. Interocular asymmetry of the superonasal retinal nerve fibre layer thickness and blood vessel diameter in healthy subjects. PLoS One 2019; 14:e0226728. [PMID: 31869361 PMCID: PMC6927597 DOI: 10.1371/journal.pone.0226728] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 12/03/2019] [Indexed: 11/19/2022] Open
Abstract
Background Optical coherence tomography is commonly used to measure the retinal nerve fibre layer thickness in both normal and diseased eyes; however, variation among normal eyes is common and may limit the usefulness of the results. The aim of this study was to explore the interocular asymmetries in retinal nerve fibre layer thickness in a group of normal eyes and to investigate the influence of blood vessel diameter on local retinal nerve fibre layer thickness. Methods In this prospective study, retinal nerve fibre layer thickness and blood vessel diameter across 100 healthy participants were measured using two optical coherence tomography instruments. Individuals were categorised into two groups based on the presence or absence of interocular retinal nerve fibre layer thickness asymmetry beyond the 75th percentile of all participants. Results The superonasal sectoral retinal nerve fibre layer thickness was significantly greater in the left eye compared to the right, across all three sectors. Mean blood vessel diameter showed a corresponding difference in thickness at one of the superonasal sectors. Linear regression showed a positive and moderate correlation between blood vessel diameter and focal retinal nerve fibre layer thickness. This trend persisted across both arteries and veins, but veins showed larger variability between left and right eye in participants with marked superonasal retinal nerve fibre layer asymmetry. Conclusion Retinal nerve fibre layer thickness and blood vessel diameter vary significantly between eyes even in healthy individuals. These asymmetries in a normal population should be taken into consideration when interpreting the retinal nerve fibre layer thickness measurements from optical coherence tomography to assist in distinguishing normal variations from disease.
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Affiliation(s)
- Angelica Ly
- Centre for Eye Health, Sydney, New South Wales, Australia
- School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
| | - Jennifer Banh
- School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
| | - Patricia Luu
- School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
| | - Jessie Huang
- Centre for Eye Health, Sydney, New South Wales, Australia
- School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
| | - Michael Yapp
- Centre for Eye Health, Sydney, New South Wales, Australia
- School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
| | - Barbara Zangerl
- Centre for Eye Health, Sydney, New South Wales, Australia
- School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
- * E-mail:
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25
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Rotruck JC, House RJ, Freedman SF, Kelly MP, Enyedi LB, Prakalapakorn SG, Lim ME, El-Dairi MA. Optical Coherence Tomography Normative Peripapillary Retinal Nerve Fiber Layer and Macular Data in Children 0-5 Years of Age. Am J Ophthalmol 2019; 208:323-330. [PMID: 31271744 DOI: 10.1016/j.ajo.2019.06.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 06/18/2019] [Accepted: 06/19/2019] [Indexed: 12/26/2022]
Abstract
PURPOSE To determine reference values for the peripapillary retinal nerve fiber layer (pRNFL) and macula in children 0-5 years of age. DESIGN Prospective cross-sectional study. METHODS This study was set in a single large academic pediatric ophthalmology practice. Healthy, full-term children 0 to <6 years of age presenting for surgery under general anesthesia were prospectively recruited for participation. Excluded were children with systemic neurologic disease, optic nerve or retinal disease (even if unilateral) or any bilateral ocular disease process, and eyes with amblyopia, ocular disease, or spherical equivalent refractive error outside of -3.00 to +8.00 diopters. Following general anesthesia, OCT scans of the optic nerve and retina were acquired using an HRA+OCT Spectralis with Flex module (Heidelberg Engineering). Automated segmentation of the pRNFL and retinal layers was followed by manual correction. RESULTS Data were obtained from normal eyes of 57 participants (mean age 2.28 ± 1.50 years). Mean global pRNFL thickness was 107.6 ± 10.3 μm. Mean global pRNFL thickness was not dependent on age but showed a negative relationship with axial length (P = .01). The mean total macular volume was 8.56 ± 0.259 mm3 (n = 38). No relationship was found between total macular volume and age. Ganglion cell layer, ganglion cell complex, and inner nuclear layer volumes showed an inverse relationship with age while the photoreceptor layers showed a logarithmic increase with age. CONCLUSIONS Global pRNFL thickness measurements remain stable over time. Macular volume and thickness values of segmented retinal layers reflect the development of the macula with age.
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Affiliation(s)
- Jill C Rotruck
- Duke University Department of Ophthalmology, Durham, North Carolina, USA; Department of Ophthalmology and Visual Science, Yale School of Medicine, New Haven, Connecticut, USA
| | - Robert J House
- Duke University Department of Ophthalmology, Durham, North Carolina, USA
| | - Sharon F Freedman
- Duke University Department of Ophthalmology, Durham, North Carolina, USA
| | - Michael P Kelly
- Duke University Department of Ophthalmology, Durham, North Carolina, USA
| | - Laura B Enyedi
- Duke University Department of Ophthalmology, Durham, North Carolina, USA
| | | | - Maria E Lim
- Duke University Department of Ophthalmology, Durham, North Carolina, USA; Dean McGee Eye Institute, University of Oklahoma School of Medicine, Oklahoma City, Oklahoma, USA
| | - Mays A El-Dairi
- Duke University Department of Ophthalmology, Durham, North Carolina, USA.
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26
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Hong S, Yang H, Gardiner SK, Luo H, Hardin C, Sharpe GP, Caprioli J, Demirel S, Girkin CA, Liebmann JM, Mardin CY, Quigley HA, Scheuerle AF, Fortune B, Chauhan BC, Burgoyne CF. OCT-Detected Optic Nerve Head Neural Canal Direction, Obliqueness, and Minimum Cross-Sectional Area in Healthy Eyes. Am J Ophthalmol 2019; 208:185-205. [PMID: 31095953 DOI: 10.1016/j.ajo.2019.05.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/03/2019] [Accepted: 05/06/2019] [Indexed: 12/28/2022]
Abstract
PURPOSE To assess anterior scleral canal opening (ASCO) offset relative to Bruch's membrane opening (BMO) (ASCO/BMO offset) so as to determine neural canal direction, obliqueness, and minimum cross-sectional area (NCMCA) in 362 healthy eyes. DESIGN Cross-sectional study. METHODS After optical coherence tomography optic nerve head and retinal nerve fiber layer thickness (RNFLT) imaging, BMO and ASCO were manually segmented. Planes, centroids, size, and shape were calculated. Neural canal direction was defined by projecting the neural canal axis vector (connecting BMO and ASCO centroids) onto the BMO plane. Neural canal obliqueness was defined by the angle between the neural canal axis and the BMO plane perpendicular vector. NCMCA was defined by projecting BMO and ASCO points onto a neural canal axis perpendicular plane and measuring the area of overlap. The angular distance between superior and inferior peak RNFLT was measured, and correlations between RFNLT, BMO, ASCO, ASCO/BMO offset, and NCMCA were assessed. RESULTS Mean (SD) NCMCA was significantly smaller than either the BMO or ASCO area (1.33 (0.42), 1.82 (0.38), 2.22 (0.43) mm2, respectively), and most closely correlated to RNFLT (P < .001, R2 = 0.158). Neural canal direction was most commonly superior-nasal (55%). Mean neural canal obliqueness was 39.4° (17.3°). The angular distance between superior and inferior peak RNFLT correlated to neural canal direction (P ≤ .008, R2 = 0.093). CONCLUSIONS ASCO/BMO offset underlies neural canal direction, obliqueness, and NCMCA. RNFLT is more strongly correlated to NCMCA than to BMO or ASCO, and its peripapillary distribution is influenced by neural canal direction.
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Affiliation(s)
- Seungwoo Hong
- Devers Eye Institute, Optic Nerve Head Research Laboratory, Legacy Research Institute, Portland, Oregon, USA; Department of Ophthalmology, Medical College, the Catholic University of Korea, Seoul, Korea
| | - Hongli Yang
- Devers Eye Institute, Optic Nerve Head Research Laboratory, Legacy Research Institute, Portland, Oregon, USA
| | - Stuart K Gardiner
- Devers Eye Institute, Discoveries in Sight Research Laboratories, Legacy Research Institute, Portland, Oregon, USA
| | - Haomin Luo
- Department of Ophthalmology, Second Xiangya Hospital, Central South University, Changsha, Hunan Province, P.R. China; Devers Eye Institute, Optic Nerve Head Research Laboratory, Legacy Research Institute, Portland, Oregon, USA
| | - Christy Hardin
- Devers Eye Institute, Optic Nerve Head Research Laboratory, Legacy Research Institute, Portland, Oregon, USA
| | - Glen P Sharpe
- Ophthalmology and Visual Sciences, Dalhousie University, Halifax, NS, Canada
| | - Joseph Caprioli
- Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | - Shaban Demirel
- Devers Eye Institute, Discoveries in Sight Research Laboratories, Legacy Research Institute, Portland, Oregon, USA
| | - Christopher A Girkin
- Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jeffrey M Liebmann
- Einhorn Clinical Research Center, Moise and Chella Safra Advanced Ocular Imaging Laboratory, New York Eye and Ear Infirmary of Mount Sinai Health System, New York, USA
| | | | - Harry A Quigley
- Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA
| | | | - Brad Fortune
- Devers Eye Institute, Discoveries in Sight Research Laboratories, Legacy Research Institute, Portland, Oregon, USA
| | | | - Claude F Burgoyne
- Devers Eye Institute, Optic Nerve Head Research Laboratory, Legacy Research Institute, Portland, Oregon, USA.
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27
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Abstract
In humans, the production of melatonin is suppressed by light exposure. This effect is mediated by a retinal pathway involving the melanopsin-containing intrinsincally photosensitive retinal ganglion cells (ipRGCs), which exhibit maximum sensitivity to short-wavelength light. Here, based on extant and published data, we examine how signals from the two eyes are integrated in driving the suppression of melatonin by light. We find that melatonin suppression by light exposure to two eyes corresponds to a sensitivity shift by about 1.2 log units (factor ~17.4).
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Affiliation(s)
- Manuel Spitschan
- Department of Experimental Psychology, University of Oxford, Oxford, UK
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, Switzerland
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, Switzerland
| | - Christian Cajochen
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, Switzerland
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, Switzerland
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28
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Donahue RJ, Maes ME, Grosser JA, Nickells RW. BAX-Depleted Retinal Ganglion Cells Survive and Become Quiescent Following Optic Nerve Damage. Mol Neurobiol 2019; 57:1070-1084. [PMID: 31673950 DOI: 10.1007/s12035-019-01783-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 09/12/2019] [Indexed: 12/19/2022]
Abstract
Removal of the Bax gene from mice completely protects the somas of retinal ganglion cells (RGCs) from apoptosis following optic nerve injury. This makes BAX a promising therapeutic target to prevent neurodegeneration. In this study, Bax+/- mice were used to test the hypothesis that lowering the quantity of BAX in RGCs would delay apoptosis following optic nerve injury. RGCs were damaged by performing optic nerve crush (ONC) and then immunostaining for phospho-cJUN, and quantitative PCR were used to monitor the status of the BAX activation mechanism in the months following injury. The apoptotic susceptibility of injured cells was directly tested by virally introducing GFP-BAX into Bax-/- RGCs after injury. The competency of quiescent RGCs to reactivate their BAX activation mechanism was tested by intravitreal injection of the JNK pathway agonist, anisomycin. Twenty-four weeks after ONC, Bax+/- mice had significantly less cell loss in their RGC layer than Bax+/+ mice 3 weeks after ONC. Bax+/- and Bax+/+ RGCs exhibited similar patterns of nuclear phospho-cJUN accumulation immediately after ONC, which persisted in Bax+/- RGCs for up to 7 weeks before abating. The transcriptional activation of BAX-activating genes was similar in Bax+/- and Bax+/+ RGCs following ONC. Intriguingly, cells deactivated their BAX activation mechanism between 7 and 12 weeks after crush. Introduction of GFP-BAX into Bax-/- cells at 4 weeks after ONC showed that these cells had a nearly normal capacity to activate this protein, but this capacity was lost 8 weeks after crush. Collectively, these data suggest that 8-12 weeks after crush, damaged cells no longer displayed increased susceptibility to BAX activation relative to their naïve counterparts. In this same timeframe, retinal glial activation and the signaling of the pro-apoptotic JNK pathway also abated. Quiescent RGCs did not show a timely reactivation of their JNK pathway following intravitreal injection with anisomycin. These findings demonstrate that lowering the quantity of BAX in RGCs is neuroprotective after acute injury. Damaged RGCs enter a quiescent state months after injury and are no longer responsive to an apoptotic stimulus. Quiescent RGCs will require rejuvenation to reacquire functionality.
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Affiliation(s)
- Ryan J Donahue
- Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, WI, USA
- Cellular and Molecular Pathology Graduate Program, University of Wisconsin, Madison, WI, USA
| | - Margaret E Maes
- Department of Life Sciences, Institute of Science and Technology, Klosterneuburg, Austria
| | - Joshua A Grosser
- Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, WI, USA
| | - Robert W Nickells
- Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, WI, USA.
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29
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Suen HC, Qian Y, Liao J, Luk CS, Lee WT, Ng JKW, Chan TTH, Hou HW, Li I, Li K, Chan WY, Feng B, Gao L, Jiang X, Liu YH, Rudd JA, Hobbs R, Qi H, Ng TK, Mak HK, Leung KS, Lee TL. Transplantation of Retinal Ganglion Cells Derived from Male Germline Stem Cell as a Potential Treatment to Glaucoma. Stem Cells Dev 2019; 28:1365-1375. [PMID: 31580778 DOI: 10.1089/scd.2019.0060] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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] [Indexed: 01/19/2023] Open
Abstract
Glaucoma is characterized by retinal ganglion cell (RGC) degeneration and is the second leading cause of blindness worldwide. However, current treatments such as eye drop or surgery have limitations and do not target the loss of RGC. Regenerative therapy using embryonic stem cells (ESCs) holds a promising option, but ethical concern hinders clinical applications on human subjects. In this study, we employed spermatogonial stem cells (SSCs) as an alternative source of ESCs for cell-based regenerative therapy in mouse glaucoma model. We generated functional RGCs from SSCs with a two-step protocol without applying viral transfection or chemical induction. SSCs were first dedifferentiated to embryonic stem-like cells (SSC-ESCs) that resemble ESCs in morphology, gene expression signatures, and stem cell properties. The SSC-ESCs then differentiated toward retinal lineages. We showed SSC-ESC-derived retinal cells expressed RGC-specific marker Brn3b and functioned as bona fide RGCs. To allow in vivo RGC tracing, Brn3b-EGFP reporter SSC-ESCs were generated and the derived RGCs were subsequently transplanted into the retina of glaucoma mouse models by intravitreal injection. We demonstrated that the transplanted RGCs could survive in host retina for at least 10 days after transplantation. SSC-ESC-derived RGCs can thus potentially be a novel alternative to replace the damaged RGCs in glaucomatous retina.
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Affiliation(s)
- Hoi Ching Suen
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Yan Qian
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Jinyue Liao
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Chun Shui Luk
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Wing Tung Lee
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Judy Kin Wing Ng
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Thomas Ting Hei Chan
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Hei Wan Hou
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Ingrid Li
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Kit Li
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Wai-Yee Chan
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Bo Feng
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Lin Gao
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Xiaohua Jiang
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Yuen Hang Liu
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - John A Rudd
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Robin Hobbs
- Aust Regenerative Medicine Institute, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Huayu Qi
- Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou Institutes of Biomedicine and Health, Guangzhou, China
| | - Tsz Kin Ng
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Heather Kayew Mak
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Kai Shun Leung
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Tin-Lap Lee
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
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30
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Claes M, De Groef L, Moons L. Target-Derived Neurotrophic Factor Deprivation Puts Retinal Ganglion Cells on Death Row: Cold Hard Evidence and Caveats. Int J Mol Sci 2019; 20:E4314. [PMID: 31484425 PMCID: PMC6747494 DOI: 10.3390/ijms20174314] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 08/02/2019] [Revised: 08/28/2019] [Accepted: 08/30/2019] [Indexed: 12/14/2022] Open
Abstract
Glaucoma and other optic neuropathies are characterized by axonal transport deficits. Axonal cargo travels back and forth between the soma and the axon terminus, a mechanism ensuring homeostasis and the viability of a neuron. An example of vital molecules in the axonal cargo are neurotrophic factors (NTFs). Hindered retrograde transport can cause a scarcity of those factors in the retina, which in turn can tilt the fate of retinal ganglion cells (RGCs) towards apoptosis. This postulation is one of the most widely recognized theories to explain RGC death in the disease progression of glaucoma and is known as the NTF deprivation theory. For several decades, research has been focused on the use of NTFs as a novel neuroprotective glaucoma treatment. Until now, results in animal models have been promising, but translation to the clinic has been highly disappointing. Are we lacking important knowledge to lever NTF therapies towards the therapeutic armamentarium? Or did we get the wrong end of the stick regarding the NTF deprivation theory? In this review, we will tackle the existing evidence and caveats advocating for and against the target-derived NTF deprivation theory in glaucoma, whilst digging into associated therapy efforts.
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Affiliation(s)
- Marie Claes
- Laboratory of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, 3000 Leuven, Belgium
| | - Lies De Groef
- Laboratory of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, 3000 Leuven, Belgium
| | - Lieve Moons
- Laboratory of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, 3000 Leuven, Belgium.
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31
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Abstract
BACKGROUND Melanopsin-expressing, intrinsically photosensitive retinal ganglion cells (ipRGCs) respond directly to light and have been shown to mediate a broad variety of visual behaviors in adult animals. ipRGCs are also the first light sensitive cells in the developing retina, and have been implicated in a number of retinal developmental processes such as pruning of retinal vasculature and refinement of retinofugal projections. However, little is currently known about the properties of the six ipRGC subtypes during development, and how these cells act to influence retinal development. We therefore sought to characterize the structure, physiology, and birthdate of the most abundant ipRGC subtypes, M1, M2, and M4, at discrete postnatal developmental timepoints. METHODS We utilized whole cell patch clamp to measure the electrophysiological and morphological properties of ipRGC subtypes through postnatal development. We also used EdU labeling to determine the embryonic timepoints at which ipRGC subtypes terminally differentiate. RESULTS Our data show that ipRGC subtypes are distinguishable from each other early in postnatal development. Additionally, we find that while ipRGC subtypes terminally differentiate at similar embryonic stages, the subtypes reach adult-like morphology and physiology at different developmental timepoints. CONCLUSIONS This work provides a broad assessment of ipRGC morphological and physiological properties during the postnatal stages at which they are most influential in modulating retinal development, and lays the groundwork for further understanding of the specific role of each ipRGC subtype in influencing retinal and visual system development.
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Affiliation(s)
- Jasmine A. Lucas
- Department of Neurobiology, Northwestern University, Evanston, IL USA
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32
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Nelson AJ, Chang R, LeTran V, Vu B, Burkemper B, Chu Z, Fard A, Kashani A, Xu B, Wang R, Varma R, Richter GM. Ocular Determinants of Peripapillary Vessel Density in Healthy African Americans: The African American Eye Disease Study. Invest Ophthalmol Vis Sci 2019; 60:3368-3373. [PMID: 31917454 PMCID: PMC6681862 DOI: 10.1167/iovs.19-27035] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 03/07/2019] [Accepted: 07/03/2019] [Indexed: 01/01/2023] Open
Abstract
Purpose The African American (AA) population has unique ocular anatomic characteristics and a disproportionately high incidence of glaucoma, which is associated with lower peripapillary vessel density (VD). This study aimed to identify ocular determinants of peripapillary VD in healthy AAs. Methods This was a cross-sectional, population-based study of 1029 AAs, ages 40 and older. Participants underwent examination to obtain axial length (AL), IOP, central corneal thickness (CCT), mean retinal nerve fiber layer (RNFL) thickness, visual field mean deviation (MD), and 6 × 6-mm optical coherence tomography angiography scans of the optic nerve. Participants with glaucoma, vision-threatening diabetic retinopathy, or other relevant ocular disease were excluded. Prototype software was used to quantify VD. A multivariable regression model, controlling for age and signal strength, identified the ocular variables that predicted peripapillary VD. The contribution of each variable was assessed with the magnitude of standardized regression coefficients (SRC). Results Based on univariate regressions, AL, RNFL thickness, and MD had significant associations with peripapillary VD (all P < 0.001). In the final multivariate model, lower mean RNFL thickness (β = 0.0022, P < 0.001, SRC = 0.542) and longer AL (β = -0.0055, P < 0.001, SRC = -0.118) were associated with lower peripapillary VD, controlling for age and signal strength, with model R2 of 0.69. Conclusions Thinner RNFL and longer AL were the most influential ocular determinants of lower peripapillary perfusion in healthy AA eyes. Additional research is needed to clarify whether longer AL increases risk of glaucoma by affecting capillary perfusion.
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Affiliation(s)
- Andrew J. Nelson
- USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of the University of Southern California, California, United States
| | - Ryuna Chang
- USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of the University of Southern California, California, United States
| | - Vivian LeTran
- USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of the University of Southern California, California, United States
| | - Brian Vu
- University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Bruce Burkemper
- Departments of Preventive Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, California, United States
| | - Zhongdi Chu
- Department of Bioengineering, University of Washington, Washington, United States
| | - Ali Fard
- Carl Zeiss Meditec, Dublin, California, United States
| | - Amir Kashani
- USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of the University of Southern California, California, United States
| | - Benjamin Xu
- USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of the University of Southern California, California, United States
| | - Ruikang Wang
- Department of Bioengineering, University of Washington, Washington, United States
| | - Rohit Varma
- Southern California Eye Institute, CHA Hollywood Presbyterian Medical Center, Los Angeles, California, United States
| | - Grace M. Richter
- USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of the University of Southern California, California, United States
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Sawant OB, Jidigam VK, Fuller RD, Zucaro OF, Kpegba C, Yu M, Peachey NS, Rao S. The circadian clock gene Bmal1 is required to control the timing of retinal neurogenesis and lamination of Müller glia in the mouse retina. FASEB J 2019; 33:8745-8758. [PMID: 31002540 PMCID: PMC6662963 DOI: 10.1096/fj.201801832rr] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 04/02/2019] [Indexed: 12/20/2022]
Abstract
A single pool of multipotent retinal progenitor cells give rise to the diverse cell types within the mammalian retina. Such cellular diversity is due to precise control of various cellular processes like cell specification, proliferation, differentiation, and maturation. Circadian clock genes can control the expression of key regulators of cell cycle progression and therefore can synchronize the cell cycle state of a heterogeneous population of cells. Here we show that the protein encoded by the circadian clock gene brain and muscle arnt-like protein-1 (Bmal1) is expressed in the embryonic retina and is required to regulate the timing of cell cycle exit. Accordingly, loss of Bmal1 during retinal neurogenesis results in increased S-phase entry and delayed cell cycle exit. Disruption in cell cycle kinetics affects the timely generation of the appropriate neuronal population thus leading to an overall decrease in the number of retinal ganglion cells, amacrine cells, and an increase in the number of the late-born type II cone bipolar cells as well as the Müller glia. Additionally, the mislocalized Müller cells are observed in the photoreceptor layer in the Bmal1 conditional mutants. These changes affect the functional integrity of the visual circuitry as we report a significant delay in visual evoked potential implicit time in the retina-specific Bmal1 null animals. Our results demonstrate that Bmal1 is required to maintain the balance between the neural and glial cells in the embryonic retina by coordinating the timing of cell cycle entry and exit. Thus, Bmal1 plays an essential role during retinal neurogenesis affecting both development and function of the mature retina.-Sawant, O. B., Jidigam, V. K., Fuller, R. D., Zucaro, O. F., Kpegba, C., Yu, M., Peachey, N. S., Rao, S. The circadian clock gene Bmal1 is required to control the timing of retinal neurogenesis and lamination of Müller glia in the mouse retina.
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Affiliation(s)
- Onkar B. Sawant
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Vijay K. Jidigam
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Rebecca D. Fuller
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Olivia F. Zucaro
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Cristel Kpegba
- Department of Ophthalmology, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio, USA
| | - Minzhong Yu
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Department of Ophthalmology, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio, USA
| | - Neal S. Peachey
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Department of Ophthalmology, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio, USA
- Research Service, Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, Ohio, USA
| | - Sujata Rao
- Department of Ophthalmic Research, Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Department of Ophthalmology, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio, USA
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Trujillo-Gonzalez I, Friday WB, Munson CA, Bachleda A, Weiss ER, Alam NM, Sha W, Zeisel SH, Surzenko N. Low availability of choline in utero disrupts development and function of the retina. FASEB J 2019; 33:9194-9209. [PMID: 31091977 PMCID: PMC6662989 DOI: 10.1096/fj.201900444r] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 04/15/2019] [Indexed: 12/14/2022]
Abstract
Adequate supply of choline, an essential nutrient, is necessary to support proper brain development. Whether prenatal choline availability plays a role in development of the visual system is currently unknown. In this study, we addressed the role of in utero choline supply for the development and later function of the retina in a mouse model. We lowered choline availability in the maternal diet during pregnancy and assessed proliferative and differentiation properties of retinal progenitor cells (RPCs) in the developing prenatal retina, as well as visual function in adult offspring. We report that low choline availability during retinogenesis leads to persistent retinal cytoarchitectural defects, ranging from focal lesions with displacement of retinal neurons into subretinal space to severe hypocellularity and ultrastructural defects in photoreceptor organization. We further show that low choline availability impairs timely differentiation of retinal neuronal cells, such that the densities of early-born retinal ganglion cells, amacrine and horizontal cells, as well as cone photoreceptor precursors, are reduced in low choline embryonic d 17.5 retinas. Maintenance of higher proportions of RPCs that fail to exit the cell cycle underlies aberrant neuronal differentiation in low choline embryos. Increased RPC cell cycle length, and associated reduction in neurofibromin 2/Merlin protein, an upstream regulator of the Hippo signaling pathway, at least in part, explain aberrant neurogenesis in low choline retinas. Furthermore, we find that animals exposed to low choline diet in utero exhibit a significant degree of intraindividual variation in vision, characterized by marked functional discrepancy between the 2 eyes in individual animals. Together, our findings demonstrate, for the first time, that choline availability plays an essential role in the regulation of temporal progression of retinogenesis and provide evidence for the importance of adequate supply of choline for proper development of the visual system.-Trujillo-Gonzalez, I., Friday, W. B., Munson, C. A., Bachleda, A., Weiss, E. R., Alam, N. M., Sha, W., Zeisel, S. H., Surzenko, N. Low availability of choline in utero disrupts development and function of the retina.
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Affiliation(s)
- Isis Trujillo-Gonzalez
- Nutrition Research Institute, University of North Carolina–Chapel Hill, Kannapolis, North Carolina, USA
| | - Walter B. Friday
- Nutrition Research Institute, University of North Carolina–Chapel Hill, Kannapolis, North Carolina, USA
| | - Carolyn A. Munson
- Nutrition Research Institute, University of North Carolina–Chapel Hill, Kannapolis, North Carolina, USA
| | - Amelia Bachleda
- Department of Cell Biology and Physiology, University of North Carolina–Chapel Hill, Chapel Hill, North Carolina, USA
| | - Ellen R. Weiss
- Department of Cell Biology and Physiology, University of North Carolina–Chapel Hill, Chapel Hill, North Carolina, USA
| | - Nazia M. Alam
- Department of Physiology and Biophysics, Weill Cornell Medical College, New York, New York, USA
- Center for Visual Restoration, Burke Neurological Institute, White Plains, New York, USA
| | - Wei Sha
- Bioinformatics Services Division, University of North Carolina–Charlotte, Kannapolis, North Carolina, USA
| | - Steven H. Zeisel
- Nutrition Research Institute, University of North Carolina–Chapel Hill, Kannapolis, North Carolina, USA
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina–Chapel Hill, Chapel Hill, North Carolina, USA
| | - Natalia Surzenko
- Nutrition Research Institute, University of North Carolina–Chapel Hill, Kannapolis, North Carolina, USA
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina–Chapel Hill, Chapel Hill, North Carolina, USA
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Teotia P, Van Hook MJ, Fischer D, Ahmad I. Human retinal ganglion cell axon regeneration by recapitulating developmental mechanisms: effects of recruitment of the mTOR pathway. Development 2019; 146:dev178012. [PMID: 31273087 PMCID: PMC6633601 DOI: 10.1242/dev.178012] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 05/15/2019] [Indexed: 12/15/2022]
Abstract
The poor axon regeneration in the central nervous system (CNS) often leads to permanent functional deficit following disease or injury. For example, degeneration of retinal ganglion cell (RGC) axons in glaucoma leads to irreversible loss of vision. Here, we have tested the hypothesis that the mTOR pathway regulates the development of human RGCs and that its recruitment after injury facilitates axon regeneration. We observed that the mTOR pathway is active during RGC differentiation, and using the induced pluripotent stem cell model of neurogenesis show that it facilitates the differentiation, function and neuritogenesis of human RGCs. Using a microfluidic model, we demonstrate that recruitment of the mTOR pathway facilitates human RGC axon regeneration after axotomy, providing evidence that the recapitulation of developmental mechanism(s) might be a viable approach for facilitating axon regeneration in the diseased or injured human CNS, thus helping to reduce and/or recover loss of function.
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Affiliation(s)
- Pooja Teotia
- Department of Ophthalmology and Visual Science, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Matthew J Van Hook
- Department of Ophthalmology and Visual Science, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Dietmar Fischer
- Department of Cell Physiology, Ruhr University of Bochum, Universitätsstraße 150, 44780 Bochum, Germany
- Division of Experimental Neurology, Medical Faculty, Heinrich Heine University, Merowingerplatz 1a, 40225 Düsseldorf, Germany
| | - Iqbal Ahmad
- Department of Ophthalmology and Visual Science, University of Nebraska Medical Center, Omaha, NE 68198, USA
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Abstract
Myopia is a substantial public health problem worldwide. Although it is known that defocused images alter eye growth and refraction, their effects on retinal ganglion cell (RGC) signaling that lead to either emmetropization or refractive errors have remained elusive. This study aimed to determine if defocused images had an effect on signaling of RGCs in the mouse retina. ON and OFF alpha RGCs and ON-OFF RGCs were recorded from adult C57BL/6J wild-type mice. A mono green organic light-emitting display presented images generated by PsychoPy. The defocused images were projected on the retina under a microscope. Dark-adapted mouse RGCs were recorded under different powers of projected defocused images on the retina. Compared with focused images, defocused images showed a significantly decreased probability of spikes. More than half of OFF transient RGCs and ON sustained RGCs showed disparity in responses to the magnitude of plus and minus optical defocus (although remained RGCs we tested exhibited similar response to both types of defocus). ON and OFF units of ON-OFF RGCs also responded differently in the probability of spikes to defocused images and spatial frequency images. After application of a gap junction blocker, the probability of spikes of RGCs decreased with the presence of optical defocused image. At the same time, the RGCs also showed increased background noise. Therefore, defocused images changed the signaling of some ON and OFF alpha RGCs and ON-OFF RGCs in the mouse retina. The process may be the first step in the induction of myopia development. It appears that gap junctions also play a key role in this process.
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Affiliation(s)
- Feng Pan
- School of Optometry, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.
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Shi Q, Gupta P, Boukhvalova AK, Singer JH, Butts DA. Functional characterization of retinal ganglion cells using tailored nonlinear modeling. Sci Rep 2019; 9:8713. [PMID: 31213620 PMCID: PMC6581951 DOI: 10.1038/s41598-019-45048-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 11/11/2018] [Accepted: 05/31/2019] [Indexed: 01/30/2023] Open
Abstract
The mammalian retina encodes the visual world in action potentials generated by 20-50 functionally and anatomically-distinct types of retinal ganglion cell (RGC). Individual RGC types receive synaptic input from distinct presynaptic circuits; therefore, their responsiveness to specific features in the visual scene arises from the information encoded in synaptic input and shaped by postsynaptic signal integration and spike generation. Unfortunately, there is a dearth of tools for characterizing the computations reflected in RGC spike output. Therefore, we developed a statistical model, the separable Nonlinear Input Model, to characterize the excitatory and suppressive components of RGC receptive fields. We recorded RGC responses to a correlated noise ("cloud") stimulus in an in vitro preparation of mouse retina and found that our model accurately predicted RGC responses at high spatiotemporal resolution. It identified multiple receptive fields reflecting the main excitatory and suppressive components of the response of each neuron. Significantly, our model accurately identified ON-OFF cells and distinguished their distinct ON and OFF receptive fields, and it demonstrated a diversity of suppressive receptive fields in the RGC population. In total, our method offers a rich description of RGC computation and sets a foundation for relating it to retinal circuitry.
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Affiliation(s)
- Qing Shi
- Department of Biology, University of Maryland, College Park, MD, United States.
| | - Pranjal Gupta
- Department of Biology, University of Maryland, College Park, MD, United States
| | | | - Joshua H Singer
- Department of Biology, University of Maryland, College Park, MD, United States
- Program in Neuroscience and Cognitive Science, University of Maryland, College Park, MD, United States
| | - Daniel A Butts
- Department of Biology, University of Maryland, College Park, MD, United States
- Program in Neuroscience and Cognitive Science, University of Maryland, College Park, MD, United States
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Liu H, Wang W, Li X, Huang C, Zhang Z, Yuan M, Li X. High hydrostatic pressure induces apoptosis of retinal ganglion cells via regulation of the NGF signalling pathway. Mol Med Rep 2019; 19:5321-5334. [PMID: 31059045 PMCID: PMC6522898 DOI: 10.3892/mmr.2019.10206] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 07/17/2018] [Accepted: 04/02/2019] [Indexed: 12/23/2022] Open
Abstract
High pressure is the most important factor inducing retinal ganglion cell (RGC) apoptosis. However, the underlying mechanisms remain obscure. The present study investigated the effects of different levels of hydrostatic pressure (HP) on RGCs and the potential mechanisms involved. Primary cultured rat RGCs were exposed to five levels of HP (0, 20, 40, 60 and 80 mmHg) for 24 h. Morphological changes in RGCs were observed. The viability and apoptosis rate of RGCs were detected using a Cell Counting Kit‑8 assay and Annexin V‑fluorescein isothiocyanate/propidium iodide flow cytometry, respectively. Western blotting, reverse transcription‑quantitative polymerase chain reaction and immunofluorescence were used to detect the expression and mRNA levels of nerve growth factor (NGF), protein kinase B (AKT), apoptosis signal‑regulating kinase 1 (ASK1), forkhead box O1 (FoxO1) and cAMP response element binding protein (CREB). In the 0‑ and 20‑mmHg groups, there were no apoptotic morphological changes. In the 40 mmHg group, parts of the cell were shrunken or disrupted. In the 60 mmHg group, neurite extension was weakened and parts of the cells were disintegrating or dying. In the 80 mmHg group, the internal structures of the cells were not visible at all. The apoptosis rates of RGCs were significantly higher and the viability rates significantly lower under 40, 60 and 80 mmHg compared with under 0 or 20 mmHg (all P<0.01). The expression and mRNA levels of NGF, AKT and CREB decreased in a dose‑dependent manner in the 40‑, 60‑ and 80‑mmHg groups (all P<0.05), but those of ASK1 and FoxO1 increased in a dose‑dependent manner (all P<0.05). Interestingly, the alterations to the expression and mRNA levels of CREB were significantly larger compared with the changes in ASK1 or FoxO1 in the 40‑, 60‑ and 80‑mmHg groups (all P<0.01). The results of the present study demonstrate that elevated HP of 40, 60 or 80 mmHg reduces viability and induces apoptosis in RGCs, which may occur through effects on the NGF/ASK1/FoxO1 and NGF/AKT/CREB pathways, of which the latter is more strongly affected.
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Affiliation(s)
- Hongji Liu
- College of Ophthalmology, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610072, P.R. China
| | - Wei Wang
- Department of Ophthalmology, Kunming Municipal Hospital of Traditional Chinese Medicine, Kunming, Yunnan 646000, P.R. China
| | - Xiang Li
- Department of Ophthalmology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610072, P.R. China
| | - Chao Huang
- Central Laboratory, Shenzhen Bao'an People's Hospital Affiliated to Southern Medical University, Shenzhen, Guangdong 518100, P.R. China
| | - Zongduan Zhang
- Department of Ophthalmology, The Affiliated Eye Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China
| | - Mingyue Yuan
- College of Ophthalmology, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610072, P.R. China
| | - Xiangyu Li
- College of Ophthalmology, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610072, P.R. China
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Aliper AT, Zaichikova AA, Damjanović I, Maximov PV, Kasparson AA, Gačić Z, Maximova EM. Updated functional segregation of retinal ganglion cell projections in the tectum of a cyprinid fish-further elaboration based on microelectrode recordings. Fish Physiol Biochem 2019; 45:773-792. [PMID: 30612338 DOI: 10.1007/s10695-018-0603-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 12/26/2018] [Indexed: 06/09/2023]
Abstract
Single-unit responses of retinal ganglion cells (GCs) were recorded extracellularly from their axonal terminals in the tectum opticum (TO) of the intact fish (goldfish, carp). The depths of retinal units consecutively recorded along the track of the microelectrode were measured. At the depth of around 50 μm, the responses of six types of direction-selective (DS) GCs were regularly recorded. Responses of two types of orientation-selective (OS) GCs and detectors of white and black spots occurred approximately 50 μm deeper. Responses of GCs with dark- and light-sustained activity were recorded deeper than all others, at about 200 μm. The receptive fields of consecutively recorded units overlap, so they analyze the same fragment of the visual scene, focused by eye optic on the photoreceptor raster. The responses of pairs of DS GCs (ON and OFF units that preferred same direction of stimulus movement) and OS GCs (detectors of vertical and horizontal lines) were often simultaneously recorded at one position of the microelectrode. (The paired recordings of certain units amounted about fourth part of all recordings.) This suggests that their axonal arborizations are located close to each other in the tectal retinorecipient layer. Electrophysiological method, thus, allows to indirectly clarify and make precise the morphology of the retino-tectal connections and to establish a morpho-physiological correspondence.
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Affiliation(s)
- Alexey T Aliper
- Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia, 127051
| | - Alisa A Zaichikova
- Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia, 127051
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia, 119991
| | - Ilija Damjanović
- Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia, 127051
| | - Paul V Maximov
- Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia, 127051
| | - Anna A Kasparson
- Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia, 127051
| | - Zoran Gačić
- Institute for Multidisciplinary Research,, University of Belgrade, P.O. Box 33, Belgrade, 11000, Serbia.
- , Belgrade, Serbia.
| | - Elena M Maximova
- Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia, 127051
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40
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Hong YK, Burr EF, Sanes JR, Chen C. Heterogeneity of retinogeniculate axon arbors. Eur J Neurosci 2019; 49:948-956. [PMID: 29883007 PMCID: PMC6286704 DOI: 10.1111/ejn.13986] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 05/10/2018] [Accepted: 05/23/2018] [Indexed: 01/25/2023]
Abstract
The retinogeniculate synapse transmits information from retinal ganglion cells (RGC) in the eye to thalamocortical relay neurons in the visual thalamus, the dorsal lateral geniculate nucleus (dLGN). Studies in mice have identified genetic markers for distinct classes of RGCs encoding different features of the visual space, facilitating the dissection of RGC subtype-specific physiology and anatomy. In this study, we examine the morphological properties of axon arbors of the BD-RGC class of ON-OFF direction selective cells that, by definition, exhibit a stereotypic dendritic arbor and termination pattern in the retina. We find that axon arbors from the same class of RGCs exhibit variations in their structure based on their target region of the dLGN. Our findings suggest that target regions may influence the morphologic and synaptic properties of their afferent inputs.
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Affiliation(s)
- Y. Kate Hong
- F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, U.S.A
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, U.S.A
| | - Eliza F. Burr
- F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, U.S.A
| | - Joshua R. Sanes
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, U.S.A
| | - Chinfei Chen
- F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, U.S.A
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Capowski EE, Samimi K, Mayerl SJ, Phillips MJ, Pinilla I, Howden SE, Saha J, Jansen AD, Edwards KL, Jager LD, Barlow K, Valiauga R, Erlichman Z, Hagstrom A, Sinha D, Sluch VM, Chamling X, Zack DJ, Skala MC, Gamm DM. Reproducibility and staging of 3D human retinal organoids across multiple pluripotent stem cell lines. Development 2019; 146:dev171686. [PMID: 30567931 PMCID: PMC6340149 DOI: 10.1242/dev.171686] [Citation(s) in RCA: 132] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 12/10/2018] [Indexed: 12/13/2022]
Abstract
Numerous protocols have been described for producing neural retina from human pluripotent stem cells (hPSCs), many of which are based on the culture of 3D organoids. Although nearly all such methods yield at least partial segments of retinal structure with a mature appearance, variabilities exist within and between organoids that can change over a protracted time course of differentiation. Adding to this complexity are potential differences in the composition and configuration of retinal organoids when viewed across multiple differentiations and hPSC lines. In an effort to understand better the current capabilities and limitations of these cultures, we generated retinal organoids from 16 hPSC lines and monitored their appearance and structural organization over time by light microscopy, immunocytochemistry, metabolic imaging and electron microscopy. We also employed optical coherence tomography and 3D imaging techniques to assess and compare whole or broad regions of organoids to avoid selection bias. Results from this study led to the development of a practical staging system to reduce inconsistencies in retinal organoid cultures and increase rigor when utilizing them in developmental studies, disease modeling and transplantation.
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Affiliation(s)
| | - Kayvan Samimi
- Morgridge Institute for Research, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Steven J Mayerl
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, WI 53705, USA
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - M Joseph Phillips
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Isabel Pinilla
- Aragon Institute for Health Research (IIS Aragón), Lozano Blesa University Hospital, Zaragoza 50009, Spain
- Department of Ophthalmology, Lozano Blesa University Hospital, Zaragoza 50009, Spain
| | - Sara E Howden
- Murdoch Children's Research Institute, The Royal Children's Hospital, Parkville, Victoria 3052, Australia
- Department of Paediatrics, University of Melbourne, Parkville, Victoria 3052, Australia
| | - Jishnu Saha
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Alex D Jansen
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | | | - Lindsey D Jager
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Katherine Barlow
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Rasa Valiauga
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Zachary Erlichman
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Anna Hagstrom
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Divya Sinha
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Valentin M Sluch
- Department of Ophthalmology, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Xitiz Chamling
- Department of Ophthalmology, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Donald J Zack
- Department of Ophthalmology, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Melissa C Skala
- Morgridge Institute for Research, University of Wisconsin-Madison, Madison, WI 53706, USA
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - David M Gamm
- Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, WI 53705, USA
- Department of Ophthamology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53705, USA
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Ghinia MG, Novelli E, Sajgo S, Badea TC, Strettoi E. Brn3a and Brn3b knockout mice display unvaried retinal fine structure despite major morphological and numerical alterations of ganglion cells. J Comp Neurol 2019; 527:187-211. [PMID: 27391320 PMCID: PMC5219957 DOI: 10.1002/cne.24072] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 06/07/2016] [Accepted: 06/30/2016] [Indexed: 01/21/2023]
Abstract
Ganglion cells (GCs), the retinal output neurons, receive synaptic inputs from bipolar and amacrine cells in the inner plexiform layer (IPL) and send information to the brain nuclei via the optic nerve. Although GCs constitute less than 1% of the total retinal cells, they occur in numerous types and are the first neurons formed during retinal development. Using Brn3a and Brn3b mutant mice in which the alkaline phosphatase gene was knocked-in (Badea et al. [Neuron] 2009;61:852-864; Badea and Nathans [Vision Res] 2011;51:269-279), we studied the general effects after gene removal on the retinal neuropil together with the consequences of lack of development of large numbers of GCs onto the remaining retinal neurons of the same class. We analyzed the morphology, number, and general architecture of various neuronal types presynaptic to GCs, searching for changes secondary to the decrement in the number of their postsynaptic partners, as well as the morphology and distribution of retinal astrocytes, for their strong topographical relation to GCs. We found that, despite GC losses, retinal organization in Brn3 null mice is remarkably similar to that of wild-type controls. J. Comp. Neurol. 527:187-211, 2019. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Miruna Georgiana Ghinia
- Neuroscience Institute of the Italian National Research Council, Pisa Research Campus, 56124 Pisa, Italy
- Retinal CIrcuit Development & Genetics Unit, Neurobiology–Neurodegeneration and Repair Laboratory, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892
- Babeş Bolyai University, 400084 Cluj Napoca, Romania
| | - Elena Novelli
- Neuroscience Institute of the Italian National Research Council, Pisa Research Campus, 56124 Pisa, Italy
| | - Szilard Sajgo
- Retinal CIrcuit Development & Genetics Unit, Neurobiology–Neurodegeneration and Repair Laboratory, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892
| | - Tudor Constantin Badea
- Retinal CIrcuit Development & Genetics Unit, Neurobiology–Neurodegeneration and Repair Laboratory, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892
| | - Enrica Strettoi
- Neuroscience Institute of the Italian National Research Council, Pisa Research Campus, 56124 Pisa, Italy
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Yang Y, Xu C, Chen Y, Liang JJ, Xu Y, Chen SL, Huang S, Yang Q, Cen LP, Pang CP, Sun XH, Ng TK. Green Tea Extract Ameliorates Ischemia-Induced Retinal Ganglion Cell Degeneration in Rats. Oxid Med Cell Longev 2019; 2019:8407206. [PMID: 31379990 PMCID: PMC6652088 DOI: 10.1155/2019/8407206] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 05/09/2019] [Accepted: 05/26/2019] [Indexed: 02/05/2023]
Abstract
PURPOSE Oxidative stress induced by reduced blood circulation is a critical pathological damage to retinal ganglion cells (RGCs) in glaucoma. We previously showed that green tea extract (GTE) and its catechin constituents alleviate sodium iodate-induced retinal degeneration in rats. Here, we investigated the therapeutic effect of GTE on ischemia-induced RGC degeneration in rats. METHODS RGC degeneration was induced by ischemic reperfusion in adult Fischer F344 rats. Green tea extract (Theaphenon E) was intragastrically administered 4 times within 48 hours after ischemia. RGC survival, pupillary light reflex, expressions of cell apoptosis, oxidative stress, and inflammation-related proteins were studied. RESULTS Ischemic reperfusion significantly induced apoptotic RGCs, RGC loss, and larger constricted pupil area compared to the untreated normal rats. Expressions of activated caspase-3 and caspase-8, Sod2, and inflammation-related proteins as well as p38 phosphorylation were significantly upregulated in the ischemia-injured rats. Compared to the saline-fed ischemic rats, significantly higher number of surviving RGCs, less apoptotic RGCs, and smaller constricted pupil area were observed in the GTE-fed ischemic rats. GTE also reduced the increased protein expressions caused by ischemic injury but enhanced the Jak phosphorylation in the retina. Notably, green tea extract did not affect the survival of RGCs in the uninjured normal rats. CONCLUSIONS In summary, GTE offers neuroprotection to RGCs under ischemic challenge, suggesting a potential therapeutic strategy for glaucoma and optic neuropathies.
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Affiliation(s)
- Yaping Yang
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ciyan Xu
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
| | - Yuhong Chen
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Jia-Jian Liang
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
| | - Yanxuan Xu
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
| | - Shao-Lang Chen
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
| | - Shaofen Huang
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
| | - Qichen Yang
- Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Hong Kong
| | - Ling-Ping Cen
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
| | - Chi Pui Pang
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
- Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Hong Kong
| | - Xing-huai Sun
- Department of Ophthalmology and Vision Science, Eye and Ear Nose Throat Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Tsz Kin Ng
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
- Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Hong Kong
- Shantou University Medical College, Shantou, Guangdong, China
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McGregor JE, Yin L, Yang Q, Godat T, Huynh KT, Zhang J, Williams DR, Merigan WH. Functional architecture of the foveola revealed in the living primate. PLoS One 2018; 13:e0207102. [PMID: 30485298 PMCID: PMC6261564 DOI: 10.1371/journal.pone.0207102] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 10/24/2018] [Indexed: 01/17/2023] Open
Abstract
The primate foveola, with its high cone density and magnified cortical representation, is exquisitely specialized for high-resolution spatial vision. However, uncovering the wiring of retinal circuitry responsible for this performance has been challenging due to the difficulty in recording receptive fields of foveal retinal ganglion cells (RGCs) in vivo. In this study, we use adaptive optics scanning laser ophthalmoscopy (AOSLO) to image the calcium responses of RGCs in the living primate, with a stable, high precision visual stimulus that allowed us to localize the receptive fields of hundreds of foveal ganglion cells. This approach revealed a precisely radial organization of foveal RGCs, despite the many distortions possible during the extended developmental migration of foveal cells. By back projecting the line connecting RGC somas to their receptive fields, we have been able to define the ‘physiological center’ of the foveola, locating the vertical meridian separating left and right hemifields in vivo.
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Affiliation(s)
- Juliette E. McGregor
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
| | - Lu Yin
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
| | - Qiang Yang
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
| | - Tyler Godat
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
- Institute of Optics, University of Rochester, Rochester, New York, United States of America
| | - Khang T. Huynh
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, United States of America
| | - Jie Zhang
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
| | - David R. Williams
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
- Institute of Optics, University of Rochester, Rochester, New York, United States of America
| | - William H. Merigan
- Center for Visual Science, University of Rochester, Rochester, New York, United States of America
- Flaum Eye Institute, University of Rochester Medical Center, Rochester, New York, United States of America
- * E-mail:
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45
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Yao F, Zhang E, Gao Z, Ji H, Marmouri M, Xia X. Did you choose appropriate tracer for retrograde tracing of retinal ganglion cells? The differences between cholera toxin subunit B and Fluorogold. PLoS One 2018; 13:e0205133. [PMID: 30289890 PMCID: PMC6173421 DOI: 10.1371/journal.pone.0205133] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 09/19/2018] [Indexed: 12/31/2022] Open
Abstract
Cholera toxin subunit B (CTB) and Fluorogold(FG) are two widely utilized retrograde tracers to assess the number and function of retinal ganglion cells (RGCs). However, the relative advantages and disadvantages of these tracers remain unclear, which may lead to their inappropriate application. In this study, we compared these tracers by separately injecting the tracer into the superior Colliculi (SC) in rats, one or 2 weeks later, the rats were sacrificed, and their retinas, brains, and optic nerves were collected. From the first to second week, FG displayed a greater number of labeled RGCs and a larger diffusion area in the SC than CTB; The number of CTB labeled RGCs and the diffusion area of CTB in the SC increased significantly, but there was no distinction between FG; Furthermore, CTB exhibited more labeled RGC neurites and longer neurites than FG, but no difference was evident between the same trace; The optic nerves labeled using CTB were much clearer than those labeled using FG. In conclusion, both CTB and FG can be used for the retrograde labeling of RGCs in rats at 1 or 2 weeks. FG achieves retrograde labeling of a greater number of RGCs than CTB, whereas CTB better delineates the morphology of RGCs. Furthermore, CTB seems more suitable for retrograde labeling of some small, non-image forming nuclei in the brain to which certain RGC subtypes project their axons.
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Affiliation(s)
- Fei Yao
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Endong Zhang
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zhaolin Gao
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hongpei Ji
- Department of Ophthalmology, The People’s Hospital of Guizhou Province, Guiyang, Guizhou, China
| | - Mahmoud Marmouri
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xiaobo Xia
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- * E-mail:
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46
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Fligor CM, Langer KB, Sridhar A, Ren Y, Shields PK, Edler MC, Ohlemacher SK, Sluch VM, Zack DJ, Zhang C, Suter DM, Meyer JS. Three-Dimensional Retinal Organoids Facilitate the Investigation of Retinal Ganglion Cell Development, Organization and Neurite Outgrowth from Human Pluripotent Stem Cells. Sci Rep 2018; 8:14520. [PMID: 30266927 PMCID: PMC6162218 DOI: 10.1038/s41598-018-32871-8] [Citation(s) in RCA: 107] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 08/24/2018] [Indexed: 12/13/2022] Open
Abstract
Retinal organoids are three-dimensional structures derived from human pluripotent stem cells (hPSCs) which recapitulate the spatial and temporal differentiation of the retina, serving as effective in vitro models of retinal development. However, a lack of emphasis has been placed upon the development and organization of retinal ganglion cells (RGCs) within retinal organoids. Thus, initial efforts were made to characterize RGC differentiation throughout early stages of organoid development, with a clearly defined RGC layer developing in a temporally-appropriate manner expressing a complement of RGC-associated markers. Beyond studies of RGC development, retinal organoids may also prove useful for cellular replacement in which extensive axonal outgrowth is necessary to reach post-synaptic targets. Organoid-derived RGCs could help to elucidate factors promoting axonal outgrowth, thereby identifying approaches to circumvent a formidable obstacle to RGC replacement. As such, additional efforts demonstrated significant enhancement of neurite outgrowth through modulation of both substrate composition and growth factor signaling. Additionally, organoid-derived RGCs exhibited diverse phenotypes, extending elaborate growth cones and expressing numerous guidance receptors. Collectively, these results establish retinal organoids as a valuable tool for studies of RGC development, and demonstrate the utility of organoid-derived RGCs as an effective platform to study factors influencing neurite outgrowth from organoid-derived RGCs.
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Affiliation(s)
- Clarisse M Fligor
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
| | - Kirstin B Langer
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
| | - Akshayalakshmi Sridhar
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
- Department of Biological Structure, University of Washington, Seattle, WA, 98195, USA
| | - Yuan Ren
- Department of Biological Sciences, Purdue University, West Lafayette, IN, 47907, USA
- Purdue Institute for Integrative Neuroscience, Purdue University, West Lafayette, IN, 47907, USA
| | - Priya K Shields
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
| | - Michael C Edler
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
| | - Sarah K Ohlemacher
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
| | - Valentin M Sluch
- Department of Molecular Biology and Genetics, Johns Hopkins University, Baltimore, MD, 21287, USA
| | - Donald J Zack
- Department of Molecular Biology and Genetics, Johns Hopkins University, Baltimore, MD, 21287, USA
- Department of Ophthalmology, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, 21287, USA
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, Baltimore, MD, 21287, USA
- Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, 21287, USA
| | - Chi Zhang
- Department of Medical and Molecular Genetics, Indiana University, Indianapolis, IN, 46202, USA
| | - Daniel M Suter
- Department of Biological Sciences, Purdue University, West Lafayette, IN, 47907, USA
- Purdue Institute for Integrative Neuroscience, Purdue University, West Lafayette, IN, 47907, USA
| | - Jason S Meyer
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA.
- Department of Medical and Molecular Genetics, Indiana University, Indianapolis, IN, 46202, USA.
- Stark Neurosciences Research Institute, Indiana University, Indianapolis, IN, 46202, USA.
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47
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Fan SMY, Chang YT, Chen CL, Wang WH, Pan MK, Chen WP, Huang WY, Xu Z, Huang HE, Chen T, Plikus MV, Chen SK, Lin SJ. External light activates hair follicle stem cells through eyes via an ipRGC-SCN-sympathetic neural pathway. Proc Natl Acad Sci U S A 2018; 115:E6880-E6889. [PMID: 29959210 PMCID: PMC6055137 DOI: 10.1073/pnas.1719548115] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Changes in external light patterns can alter cell activities in peripheral tissues through slow entrainment of the central clock in suprachiasmatic nucleus (SCN). It remains unclear whether cells in otherwise photo-insensitive tissues can achieve rapid responses to changes in external light. Here we show that light stimulation of animals' eyes results in rapid activation of hair follicle stem cells with prominent hair regeneration. Mechanistically, light signals are interpreted by M1-type intrinsically photosensitive retinal ganglion cells (ipRGCs), which signal to the SCN via melanopsin. Subsequently, efferent sympathetic nerves are immediately activated. Increased norepinephrine release in skin promotes hedgehog signaling to activate hair follicle stem cells. Thus, external light can directly regulate tissue stem cells via an ipRGC-SCN autonomic nervous system circuit. Since activation of sympathetic nerves is not limited to skin, this circuit can also facilitate rapid adaptive responses to external light in other homeostatic tissues.
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Affiliation(s)
- Sabrina Mai-Yi Fan
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, 100 Taipei, Taiwan
| | - Yi-Ting Chang
- Department of Life Science, College of Life Science, National Taiwan University, 106 Taipei, Taiwan
| | - Chih-Lung Chen
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, 100 Taipei, Taiwan
- Department of Dermatology, National Taiwan University Hospital and College of Medicine, 100 Taipei, Taiwan
| | - Wei-Hung Wang
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, 100 Taipei, Taiwan
| | - Ming-Kai Pan
- Department of Medical Research, National Taiwan University Hospital, 100 Taipei, Taiwan
- Department of Neurology, National Taiwan University Hospital, 100 Taipei, Taiwan
| | - Wen-Pin Chen
- Institute of Pharmacology, College of Medicine, National Taiwan University, 100 Taipei, Taiwan
| | - Wen-Yen Huang
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, 100 Taipei, Taiwan
| | - Zijian Xu
- National Institute of Biological Sciences, 102206 Beijing, China
| | - Hai-En Huang
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, 100 Taipei, Taiwan
| | - Ting Chen
- National Institute of Biological Sciences, 102206 Beijing, China
| | - Maksim V Plikus
- Center for Complex Biological Systems, University of California, Irvine, CA 92697
- Department of Developmental and Cell Biology, Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, CA 92697
| | - Shih-Kuo Chen
- Department of Life Science, College of Life Science, National Taiwan University, 106 Taipei, Taiwan;
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, 100 Taipei, Taiwan
| | - Sung-Jan Lin
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, 100 Taipei, Taiwan;
- Department of Dermatology, National Taiwan University Hospital and College of Medicine, 100 Taipei, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, 100 Taipei, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, 100 Taipei, Taiwan
- Molecular Imaging Center, National Taiwan University, 100 Taipei, Taiwan
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48
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Rheaume BA, Jereen A, Bolisetty M, Sajid MS, Yang Y, Renna K, Sun L, Robson P, Trakhtenberg EF. Single cell transcriptome profiling of retinal ganglion cells identifies cellular subtypes. Nat Commun 2018; 9:2759. [PMID: 30018341 PMCID: PMC6050223 DOI: 10.1038/s41467-018-05134-3] [Citation(s) in RCA: 234] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 06/12/2018] [Indexed: 12/13/2022] Open
Abstract
Retinal ganglion cells (RGCs) convey the major output of information collected from the eye to the brain. Thirty subtypes of RGCs have been identified to date. Here, we analyze 6225 RGCs (average of 5000 genes per cell) from right and left eyes by single-cell RNA-seq and classify them into 40 subtypes using clustering algorithms. We identify additional subtypes and markers, as well as transcription factors predicted to cooperate in specifying RGC subtypes. Zic1, a marker of the right eye-enriched subtype, is validated by immunostaining in situ. Runx1 and Fst, the markers of other subtypes, are validated in purified RGCs by fluorescent in situ hybridization (FISH) and immunostaining. We show the extent of gene expression variability needed for subtype segregation, and we show a hierarchy in diversification from a cell-type population to subtypes. Finally, we present a website for comparing the gene expression of RGC subtypes.
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Affiliation(s)
- Bruce A Rheaume
- Department of Neuroscience, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT, 06030, USA
| | - Amyeo Jereen
- Department of Neuroscience, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT, 06030, USA
| | - Mohan Bolisetty
- The Jackson Laboratory for Genomic Medicine, Farmington, CT, 06032, USA
| | - Muhammad S Sajid
- Department of Neuroscience, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT, 06030, USA
| | - Yue Yang
- Department of Neuroscience, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT, 06030, USA
| | - Kathleen Renna
- Department of Neuroscience, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT, 06030, USA
| | - Lili Sun
- The Jackson Laboratory for Genomic Medicine, Farmington, CT, 06032, USA
| | - Paul Robson
- The Jackson Laboratory for Genomic Medicine, Farmington, CT, 06032, USA
- Institute for Systems Genomics and Department of Genetics & Genome Sciences, University of Connecticut School of Medicine, Farmington, CT, 06032, USA
| | - Ephraim F Trakhtenberg
- Department of Neuroscience, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT, 06030, USA.
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49
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Abstract
Rbfox1 is a splicing regulator that has been associated with various neurological conditions such as autism spectrum disorder, mental retardation, epilepsy, attention-deficit/hyperactivity disorder and schizophrenia. We show that in adult rodent retinas, Rbfox1 is expressed in all types of retinal ganglion cells (RGCs) and in certain subsets of amacrine cells (ACs), within the inner nuclear (INL) and ganglion cell (GCL) layers. In the INL, all Rbfox1-positive cells were colocalized with GABAergic ACs, however not all GABAergic ACs were immunostained for Rbfox1. In the GCL, a vast majority of GABAergic dACs were Rbfox1-immunopositive. Furthermore, all cholinergic starburst ACs (SACs) in the INL (type a) and in the GCL (type b) were Rbfox1 positive. The expression of Rbfox1 in the retina significantly overlapped with expression of Rbfox2, another member of Rbfox family of proteins. Rbfox2, in addition to RGCs and ACs, was also expressed in horizontal cells. In developing retinas at E12 and E15, Rbfox1 is localized to the cytoplasm of differentiating RGCs and ACs. Between P0 and P5, Rbfox1 subcellular localization switched from cytoplasmic to predominantly nuclear. Downregulation of Rbfox1 in adult Rbfox1loxP/loxP mice had no detectable effect on retinal gross morphology. However, the visual cliff test revealed marked abnormalities of depth perception of these animals. RNA sequencing of retinal transcriptomes of control and Rbfox1 knockout animals identified a number of Rbfox1-regulated genes that are involved in establishing neuronal circuits and synaptic transmission, including Vamp1, Vamp2, Snap25, Trak2, and Slc1A7, suggesting the role of Rbfox1 in facilitating synaptic communications between ACs and RGCs.
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Affiliation(s)
- Lei Gu
- Department of Ophthalmology, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - Dean Bok
- Department of Ophthalmology, University of California, Los Angeles, Los Angeles, CA, United States of America
- Department of Neurobiology, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - Fei Yu
- Department of Ophthalmology, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - Joseph Caprioli
- Department of Ophthalmology, University of California, Los Angeles, Los Angeles, CA, United States of America
| | - Natik Piri
- Department of Ophthalmology, University of California, Los Angeles, Los Angeles, CA, United States of America
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50
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Fischer RA, Zhang Y, Risner ML, Li D, Xu Y, Sappington RM. Impact of Graphene on the Efficacy of Neuron Culture Substrates. Adv Healthc Mater 2018; 7:e1701290. [PMID: 29943431 PMCID: PMC6105445 DOI: 10.1002/adhm.201701290] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 04/11/2018] [Indexed: 01/09/2023]
Abstract
How graphene influences the behavior of living cells or tissues remains a critical issue for its application in biomedical studies, despite the general acceptance that graphene is biocompatible. While direct contact between cells and graphene is not a requirement for all biomedical applications, it is often mandatory for biosensing. Therefore, it is important to clarify whether graphene impedes the ability of cells to interact with biological elements in their environment. Here, a systematic study is reported to determine whether applying graphene on top of matrix substrates masks interactions between these substrates and retinal ganglion cells (RGCs). Six different platforms are tested for primary RGC cultures with three platforms comprised of matrix substrates compatible with these neurons, and another three having a layer of graphene placed on top of the matrix substrates. The results demonstrate that graphene does not impede interactions between RGCs and underlying substrate matrix, such that their positive or negative effects on neuron viability and vitality are retained. However, direct contact between RGCs and graphene reduces the number, but increases basal activity, of functional cation channels. The data indicate that, when proper baselines are established, graphene is a promising biosensing material for in vitro applications in neuroscience.
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Affiliation(s)
- Rachel A. Fischer
- Department of Ophthalmology and Visual Sciences, Vanderbilt University Medical Center, Department of Pharmacology, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN 37235, USA
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, USA
- Department of Physics and Astronomy and Department of Electrical, Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Department of Pharmacology, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN 37235, USA
| | - Yuchen Zhang
- Department of Ophthalmology and Visual Sciences, Vanderbilt University Medical Center, Department of Pharmacology, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN 37235, USA
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, USA
- Department of Physics and Astronomy and Department of Electrical, Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Department of Pharmacology, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN 37235, USA
| | - Michael L. Risner
- Department of Ophthalmology and Visual Sciences, Vanderbilt University Medical Center, Department of Pharmacology, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN 37235, USA
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, USA
- Department of Physics and Astronomy and Department of Electrical, Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Department of Pharmacology, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN 37235, USA
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