Cited by 541Glaucoma and retinal disordersNerve injury and regenerationRetinal Development and Disorders

Brn3a as a Marker of Retinal Ganglion Cells: Qualitative and Quantitative Time Course Studies in Naïve and Optic Nerve–Injured Retinas

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Nadal-Nicola´s, Francisco M., Jime´nez-Lo´pez, Manuel, Sobrado-Calvo, Paloma, Nieto-Lo´pez, Leticia, Ca´novas-Marti´nez, Isabel, Salinas-Navarro, Manuel, Vidal-Sanz, Manuel, Agudo, Marta·2009·Investigative Opthalmology & Visual Science

Abstract

PURPOSE: To characterize Brn3a expression in adult albino rat retinal ganglion cells (RGCs) in naïve animals and in animals subjected to complete intraorbital optic nerve transection (IONT) or crush (IONC). METHODS: Rats were divided into three groups, naïve, IONT, and IONC. Two-, 5-, 9-, or 14-day postlesion (dpl) retinas were examined for immunoreactivity for Brn3a. Before the injury, the RGCs were labeled with Fluorogold (FG; Fluorochrome, Corp. Denver, CO). Brn3a retinal expression was also determined by Western blot analysis. The proportion of RGCs double labeled with Brn3a and FG was determined in radial sections. The temporal course of reduction in Brn3a(+) RGCs and FG(+) RGCs induced by IONC or IONT was assessed by quantifying, in the same wholemounts, the number of surviving FG-labeled RGCs and Brn3a(+)RGCs at the mentioned time points. The total number of FG(+)RGCs was automatically counted in naïve and injured retinas (2 and 5 dpl) or estimated by manual quantification in retinas processed at 9 and 14 dpl. All Brn3a immunopositive RGCs were counted using an automatic routine specifically developed for this purpose. This protocol allowed, as well, the investigation of the spatial distribution of these neurons. RESULTS: Brn3a(+) cells were only present in the ganglion cell layer and showed a spatial distribution comparable to that of FG(+) cells. In the naïve retinal wholemounts the mean (mean +/- SEM; n = 14) total number of FG(+)RGCs and Brn3a(+)RGCs was 80,251 +/- 2,210 and 83,449 +/- 4,541, respectively. Whereas in the radial sections, 92.2% of the FG(+)RGCs were also Brn3a(+), 4.4% of the RGCs were Brn3a(+)FG(-) and 3.4% were FG(+)Brn3a(-). Brn3a expression pattern was maintained in injured RGCs. The temporal course of Brn3a(+)RGC and FG(+)RGC loss induced by IONC or IONT followed a similar trend, but Brn3a(+)RGCs loss was detected earlier than that of FG(+)RGCs. Independent of the marker used to detect the RGCs, it was observed that their loss was quicker and more severe after IONT than after IONC. CONCLUSIONS: Brn3a can be used as a reliable, efficient ex vivo marker to identify and quantify RGCs in control and optic nerve-injured retinas.

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Crossref · 10.1167/iovs.08-3267

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Authors
Nadal-Nicola´s, F. M., Jime´nez-Lo´pez, M., Sobrado-Calvo, P., Nieto-Lo´pez, L., Ca´novas-Marti´nez, I., Salinas-Navarro, M., Vidal-Sanz, M., & Agudo, M.
Affiliations
  • From Departamento de Oftalmologi´a, Facultad de Medicina, Campus Espinardo, Universidad de Murcia, Murcia, Spain;2Servicio Murciano de Salud. Hospital Universitario Virgen de la Arrixaca, Fundacio´n para la Formacio´n e Investigacio´n Sanitarias de la Reg
  • From Departamento de Oftalmologi´a, Facultad de Medicina, Campus Espinardo, Universidad de Murcia, Murcia, Spain;
Venue
Investigative Opthalmology & Visual Science
Published
2009-08-01
Volume
50
Issue
8
Pages
3860
ISSN
  • 0146-0404 (ISSN-L)
  • 1552-5783
OpenAlex
W2039127036
Cited by
541
References
53
Citations by year
2026: 18 · 2025: 28 · 2024: 30 · 2023: 28 · 2022: 36 · 2021: 34 · 2020: 37 · 2019: 36 · 2018: 36 · 2017: 29 · 2016: 40 · 2015: 41 · 2014: 42 · 2013: 31 · 2012: 23
FWCI
25.41
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • Investigative Ophthalmology & Visual Science (publishedVersion)
  • PubMed (publishedVersion)
  • Hispana (submittedVersion, cc-by-nc-nd)
Topics
  • Health Sciences › Medicine › Ophthalmology › Glaucoma and retinal disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
retinal ganglion cells, optic nerve injury, optic nerve transection, optic nerve crush, ganglion cell survival, retinal ganglion cell layer, retinal wholemounts, retinal gene expression, axon regeneration, retinal degeneration
MeSH terms
Animals, Cell Count, Female, Fluorescent Dyes, Microscopy, Fluorescence, Nerve Crush, Retina, Retinal Ganglion Cells, Stilbamidines, Time Factors, Blotting, Western, Biomarkers, Rats, Sprague-Dawley, Fluorescent Antibody Technique, Indirect, Optic Nerve Injuries, Transcription Factor Brn-3A, Rats

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