Melanopsin(+)RGCs Are fully Resistant to NMDA-Induced Excitotoxicity.
We studied short- and long-term effects of intravitreal injection of N-methyl-d-aspartate (NMDA) on melanopsin-containing (m(+)) and non-melanopsin-containing (Brn3a(+)) retinal ganglion cells (RGCs). In adult SD-rats, the left eye received a single intravitreal injection of 5µL of 100nM NMDA. At 3...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Instituto de Investigación Biomédica y Sanitaria de Alicante (ISABIAL) |
| Repositorio: | r-ISABIAL. Repositorio Institucional de Producción Científica del Instituto de Investigación Biomédica y Sanitaria de Alicante |
| OAI Identifier: | oai:isabial.fundanetsuite.com:p6347 |
| Acceso en línea: | https://isabial.portalinvestigacion.com/publicaciones6347 |
| Access Level: | acceso abierto |
| Palabra clave: | Brn3a+RGCs NMDA SD-OCT adult albino rat excitotoxicity glaucoma intrinsically photosensitive-RGCs melanopsin-RGCs retina |
| Sumario: | We studied short- and long-term effects of intravitreal injection of N-methyl-d-aspartate (NMDA) on melanopsin-containing (m(+)) and non-melanopsin-containing (Brn3a(+)) retinal ganglion cells (RGCs). In adult SD-rats, the left eye received a single intravitreal injection of 5µL of 100nM NMDA. At 3 and 15 months, retinal thickness was measured in vivo using Spectral Domain-Optical Coherence Tomography (SD-OCT). Ex vivo analyses were done at 3, 7, or 14 days or 15 months after damage. Whole-mounted retinas were immunolabelled for brain-specific homeobox/POU domain protein 3A (Brn3a) and melanopsin (m), the total number of Brn3a(+)RGCs and m(+)RGCs were quantified, and their topography represented. In control retinas, the mean total numbers of Brn3a(+)RGCs and m(+)RGCs were 78,903 ± 3572 and 2358 ± 144 (mean ± SD; n = 10), respectively. In the NMDA injected retinas, Brn3a(+)RGCs numbers diminished to 49%, 28%, 24%, and 19%, at 3, 7, 14 days, and 15 months, respectively. There was no further loss between 7 days and 15 months. The number of immunoidentified m(+)RGCs decreased significantly at 3 days, recovered between 3 and 7 days, and were back to normal thereafter. OCT measurements revealed a significant thinning of the left retinas at 3 and 15 months. Intravitreal injections of NMDA induced within a week a rapid loss of 72% of Brn3a(+)RGCs, a transient downregulation of melanopsin expression (but not m(+)RGC death), and a thinning of the inner retinal layers. |
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