Rod-Like Microglia Are Restricted to Eyes with Laser-Induced Ocular Hypertension but Absent from the Microglial Changes in the Contralateral Untreated Eye



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Hoz Montañana, María Rosa de and Gallego Collado, Beatriz Isabel and Ramírez Sebastián, Ana Isabel and Rojas López, María Blanca and Salazar Corral, Juan José and Valiente Soriano, Francisco Javier and Avilés Trigueros, Marcelino and Villegas Pérez, María Paz and Vidal Sanz, Manuel and Triviño Casado, Alberto and Ramirez Sebastian, Jose Manuel (2013) Rod-Like Microglia Are Restricted to Eyes with Laser-Induced Ocular Hypertension but Absent from the Microglial Changes in the Contralateral Untreated Eye. Plos One, 8 (12). e83733. ISSN 1932-6203

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In the mouse model of unilateral laser-induced ocular hypertension (OHT) the microglia in both the treated and the normotensive untreated contralateral eye have morphological signs of activation and up-regulation of MHC-II expression in comparison with naive. In the brain, rod-like microglia align to less-injured neurons in an effort to limit damage. We investigate whether: i) microglial activation is secondary to laser injury or to a higher IOP and; ii) the presence of rod-like microglia is related to OHT. Three groups of mice were used: age-matched control (naive, n=15); and two lasered: limbal (OHT, n=15); and non-draining portion of the sclera (scleral, n=3). In the lasered animals, treated eyes as well as contralateral eyes were analysed. Retinal whole-mounts were immunostained with antibodies against, Iba-1, NF-200, MHC-II, CD86, CD68 and Ym1. In the scleral group (normal ocular pressure) no microglial signs of activation were found. Similarly to naive eyes, OHT-eyes and their contralateral eyes had ramified microglia in the nerve-fibre layer related to the blood vessel. However, only eyes with OHT had rod-like microglia that aligned end-to-end, coupling to form trains of multiple cells running parallel to axons in the retinal surface. Rod-like microglia were CD68+ and were related to retinal ganglion cells (RGCs) showing signs of degeneration (NF-200+ RGCs). Although MHC-II expression was up-regulated in the microglia of the NFL both in OHT-eyes and their contralateral eyes, no expression of CD86 and Ym1 was detected in ramified or in rod-like microglia. After 15 days of unilateral lasering of the limbal and the non-draining portion of the sclera, activated microglia was restricted to OHT-eyes and their contralateral eyes. However, rod-like microglia were restricted to eyes with OHT and degenerated NF-200+ RGCs and were absent from their contralateral eyes. Thus, rod-like microglia seem be related to the neurodegeneration associated with HTO.

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© 2013 de Hoz et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Uncontrolled Keywords:Elevated Intraocular-Pressure; Oxygen-induced Retinopathy; Retinal Ganglion-Cells; Optic-Nerve Damage; Mice; Experimental Glaucoma; Neuronal Degeneration; Gene-Expression
Subjects:Medical sciences > Medicine > Medical genetics
Medical sciences > Medicine > Neurosciences
Medical sciences > Medicine > Ophtalmology
Medical sciences > Optics > Eyes anatomy
ID Code:31191
Deposited On:01 Jul 2015 11:34
Last Modified:07 Jul 2015 11:36

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