Changes in the Photoreceptor Mosaic of P23H-1 Rats During Retinal Degeneration: Implications for Rod-Cone Dependent Survival

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Title: Changes in the Photoreceptor Mosaic of P23H-1 Rats During Retinal Degeneration: Implications for Rod-Cone Dependent Survival
Authors: García Ayuso, Diego | Ortín Martínez, Arturo | Jiménez López, Manuel | Galindo Romero, Caridad | Cuenca, Nicolás | Pinilla Lozano, Isabel | Vidal Sanz, Manuel | Agudo Barriuso, Marta | Villegas Pérez, María Paz
Research Group/s: Neurobiología del Sistema Visual y Terapia de Enfermedades Neurodegenerativas (NEUROVIS)
Center, Department or Service: Universidad de Alicante. Departamento de Fisiología, Genética y Microbiología
Keywords: P23H | Retinitis pigmentosa | Opsin | Rhodopsin | Rings | Automated quantification
Knowledge Area: Biología Celular
Issue Date: 28-Aug-2013
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Citation: Investigative Ophthalmology & Visual Science. 2013, 54(8): 5888-5900. doi:10.1167/iovs.13-12643
Abstract: Purpose. To investigate the spatiotemporal relationship between rod and cone degeneration in the P23H-1 rat. Methods. Control Sprague-Dawley (SD) and P23H-1 rats of ages ranging from P30 to P365 were used. Retinas were processed for whole mounts or cross sections and rods and cones were immunodetected. We used newly developed image analysis techniques to quantify the total population of L/M cones (the most abundant cones in the rat) and analyzed the rings of rod-cone degeneration. Results. In P23H-1 rats, rod degeneration occurs rapidly: first the rod outer segment shortens, at P30 there is extensive rod loss, and by P180 rod loss is almost complete except for the most peripheral retina. The numbers of L/M cones are, at all postnatal ages, lower in P23H-1 rats than in control SD rats, and decrease significantly with age (by P180). Rod and cone degeneration is spatiotemporally related and occurs in rings that appear already at P90 and spread throughout the entire retina. At P180, the rings of rod-cone degeneration are more abundant in the equatorial retina and are larger in the dorsal retina. Conclusions. This work describes for the first time that in the P23H-1 rat, rod and cone degeneration is spatiotemporally related and occurs in rings. Cone loss follows rod loss and starts very soon, even before P30, the first age analyzed here. The characteristics of the rings suggest that secondary cone degeneration is influenced by retinal position and/or other intrinsic or extrinsic factors.
Sponsor: Supported by the Spanish Ministry of Economy and Competitiveness Instituto de Salud Carlos III-Fondo Europeo de Desarrollo Regional PI10/01496, PI10/00187, FIS PS0901854, SAF-2012-38328, BFU2012-36845, RD12/0034/0010, and RD12/0034/0014; Fundación Séneca de la Región de Murcia 04446/GERM/07; and Organización Nacional de Ciegos de España.
URI: http://hdl.handle.net/10045/40108
ISSN: 0146-0404 (Print) | 1552-5783 (Online)
DOI: 10.1167/iovs.13-12643
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 The Association for Research in Vision and Ophthalmology, Inc.
Peer Review: si
Publisher version: http://dx.doi.org/10.1167/iovs.13-12643
Appears in Collections:INV - NEUROVIS - Artículos de Revistas

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