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Expression data from P4 and P10 mouse optic nerves

ABSTRACT: Optic nerves are an accessible part of the CNS, providing a source of glia without the presence of neuronal cell bodies. Therefore, an analysis was carried out of gene expression in optic nerves at P4, before myelination begins and at P10, when myelination is very actively proceeding. The goal was to obtain a profile of the changing gene expression that accompanies this transition from unmyelinated CNS nerve to myelinated nerve.

ORGANISM(S): Mus musculus

PROVIDER: GSE24513 | GEO | 2011/05/16

SECONDARY ACCESSION(S): PRJNA132591

REPOSITORIES: GEO

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Expression data from P4 and P10 mouse optic nerves

Project description:Optic nerves are an accessible part of the CNS, providing a source of glia without the presence of neuronal cell bodies. Therefore, an analysis was carried out of gene expression in optic nerves at P4, before myelination begins and at P10, when myelination is very actively proceeding. The goal was to obtain a profile of the changing gene expression that accompanies this transition from unmyelinated CNS nerve to myelinated nerve. Two microarray experiments were combined here. In the first, RNA was prepared from the optic nerves of 75 P4 C57BL/6J mice and 70 P10 C57BL/6J mice. In the second experiment, RNA was prepared from the optic nerves of 55 P4 C57BL/6J mice and two groups of 50 P10 C57Bl/6J mice. In total, there are 2 P4 RNA samples and 3 P10 RNA samples being hybridized to Affymetrix GeneChip 430A for Mouse Expression.

2011-05-16 | E-GEOD-24513 | biostudies-arrayexpress

Regional Gene Expression in the Retina, Optic Nerve Head, and Optic Nerve of Mice with Optic Nerve Crush and Experimental Glaucoma

Project description:A major risk factor for glaucomatous optic neuropathy is the level of intraocular pressure (IOP), which can lead to retinal ganglion cell axon injury and cell death. The optic nerve has a rostral unmyelinated portion at the optic nerve head followed by a caudal myelinated region. The unmyelinated region is differentially susceptible to IOP-induced damage in rodent models and in human glaucoma. While several studies have analyzed gene expression changes in the mouse optic nerve following optic nerve injury, few were designed to consider the regional gene expression differences that exist between these distinct areas. We performed bulk RNA-sequencing on the retina and on separately micro-dissected unmyelinated and myelinated optic nerve regions from naïve C57BL/6 mice, mice after optic nerve crush, and mice with microbead-induced experimental glaucoma (total = 36). Gene expression patterns in the naïve unmyelinated optic nerve showed significant enrichment of the Wnt, Hippo, PI3K-Akt, and transforming growth factor β pathways, as well as extracellular matrix–receptor and cell membrane signaling pathways, compared to the myelinated optic nerve and retina. Gene expression changes induced by both injuries were more extensive in the myelinated optic nerve than the unmyelinated region, and greater after nerve crush than glaucoma. Changes present three and fourteen days after injury largely subsided by six weeks. Gene markers of reactive astrocytes did not consistently differ between injury states. Overall, the transcriptomic phenotype of the mouse unmyelinated optic nerve was significantly different from immediately adjacent tissues, likely dominated by expression in astrocytes, whose junctional complexes are inherently important in responding to IOP elevation.

2023-09-06 | GSE241782 | GEO

Transcriptomic analyses of astrocyte heterogeneity within white matter tracts

Project description:Astrocytes are broadly categorized as protoplasmic or fibrous, with the former localized to synaptically dense gray matter regions and the latter associated with axons in the white matter. Much of what we know about astrocyte form and function is derived from the study of protoplasmic astrocytes, whereas fibrous astrocytes remain relatively unexplored. We investigated the transcriptome of uninjured fibrous astrocytes in the mouse from three regions: unmyelinated optic nerve head (ONH), myelinated optic nerve proper (ONP), and corpus callosum (CC).

2022-11-29 | GSE211515 | GEO

Astrocytes of the optic nerve exhibit a region-specific and temporally distinct response to elevated intraocular pressure

Project description:The optic nerve is an important tissue in glaucoma and the unmyelinated nerve head region remains an important site of many early neurodegenerative changes. In humans and mice, astrocytes constitute the major glial cell type in the region, and in glaucoma they become reactive, influencing the optic nerve head (ONH) microenvironment and disease outcome. To determine the response of ONH astrocytes in glaucoma, we studied their transcriptional response to an elevation in intraocular pressure (IOP) induced by the microbead occlusion model. We also assessed the response of astrocytes in the more distal myelinated optic nerve proper (ONP). In this experimental model, astrocytes of the optic nerve exhibited a region-specific and temporally distinct response: ONH astrocytes showed very few early transcriptional changes and ONP astrocytes demonstrated substantially larger changes over the course of the experiment.

2023-10-01 | GSE237073 | GEO

EAE Optic Nerves Injected with LPC 18:1 + Isobaric C13-His

Project description:EAE mice were injected with LPC 18:1 and Isobaric C13-His at the optic nerve when they exhibited a clinical score of 2. Visual function was assessed via pattern electroretinogram and optic nerves were harvested 12 days post optic nerve injection. Optic nerves were processed for mass spectrometry to identify the integration of C13-His in newly synthesized proteins.

2022-02-17 | PXD025176 | Pride

EAE Optic Nerve Injections with LPC 18:1 (iTRAQ)

Project description:EAE mice were injected with LPC 18:1 at the optic nerve when they exhibited a clinical score of 2. Visual function was assessed via pattern electroretinogram and optic nerves were harvested 12 days post optic nerve injection. Three different visual recovery pathways were observed: 1) No-injection control (no recovery in visual function), 2) Low recovery visual function, 3) High recovery visual function and 4) No change in visual function.

2022-02-17 | PXD024966 | Pride

Augmenting fibronectin levels in injured adult CNS promotes axon regeneration in vivo [bulk RNA-seq]

Project description:In an attempt to repair injured central nervous system (CNS) nerves/tracts, immune cells are recruited into the injury site, but endogenous response in adult mammals is insufficient for promoting regeneration of severed axons. Here, we found that a portion of retinal ganglion cell (RGC) CNS projection neurons that survive after optic nerve crush (ONC) injury are enriched for and upregulate fibronectin (Fn)-interacting integrins Itga5 and ItgaV, and that Fn promotes long-term survival and long-distance axon regeneration of a portion of axotomized adult RGCs in culture. We then show that, Fn is developmentally downregulated in the axonal tracts of optic nerve and spinal cord, but injury-activated macrophages/microglia upregulate Fn while axon regeneration-promoting zymosan augments their recruitment (and thereby increases Fn levels) in the injured optic nerve. Finally, we found that Fn’s RGD motif, established to interact with Itga5 and ItgaV, promotes long-term survival and long-distance axon regeneration of adult RGCs after ONC in vivo, with some axons reaching the optic chiasm when co-treated with Rpl7a gene therapy. Thus, experimentally augmenting Fn levels in the injured CNS is a promising approach for therapeutic neuroprotection and axon regeneration of at least a portion of neurons.

2024-06-28 | GSE269813 | GEO

Augmenting fibronectin levels in injured adult CNS promotes axon regeneration in vivo [scRNA-seq]

2024-06-28 | GSE269812 | GEO

Retinal whole genome microarray analysis after irradiated injury of intraorbital nerve in the monkey

Project description:To obtain and analyze early retinal changes at molecular level at 24h after ipsilateral intraorbital nerve radiation injury by gamma knife surgery Unilateral intraorbital optic nerves of three Rhesus Macaques were treated by gamma knife surgery (GKS) with irradiated doses of 15Gy, while the contralateral optic nerves and retinas served as the control. Gene expression profiles of control and affected retinas were analyzed with Affymetrix Rhesus Macaque Genome arrays at 24h after treatment

2011-09-29 | E-GEOD-29901 | biostudies-arrayexpress

Nervous system injury establishes a microenvironment sufficient for brain tumor formation

Project description:To investigate the mechanism by which optic nerve crush induces microglia Ccl5 production, we performed bulk RNA sequencing on isolated optic nerves from crush- and sham-treatedNf1flox/flox;hGFAP-Cre miceat 3 months of age.

2024-02-07 | GSE233373 | GEO

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