• Neuroscience · Aug 2023

    Electrophysiological and histological correlations of optic neuritis in the Dark Agouti rat model of experimental autoimmune encephalomyelitis.

    • Itay Lotan, Shuhei Nishiyama, Amy Wright, Myoung SeokJinJNeuroimmunology Clinic and Research Laboratory, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA., and Michael Levy.
    • Neuroimmunology Clinic and Research Laboratory, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Department of Neurology and Neuroimmunology Unit, Rabin Medical Center, Petah Tikva, Israel and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.. Electronic address: lotan.itay1@gmail.com.
    • Neuroscience. 2023 Aug 1; 524: 899389-93.

    AbstractExperimental autoimmune encephalomyelitis (EAE) is an animal model of Inflammatory central nervous system (CNS) disease. Dark agouti (DA) rats immunized with full-length myelin oligodendrocyte glycoprotein (MOG1-125) typically develop a relapsing-remitting EAE form characterized by predominant demyelinating involvement of the spinal cord and optic nerve. Visually evoked potentials (VEP) are a useful objective tool to assess the optic nerve function and monitor electrophysiological changes in optic neuritis (ON). The current study aimed to assess the VEP changes in MOG-EAE DA rats using a minimally invasive recording device and to correlate them with histological findings. Twelve MOG-EAE DA rats and four controls underwent VEP recording at day 0, 7, 14, 21, and 28 post-EAE induction. Tissue samples were obtained on days 14, 21, and 28 from two EAE rats and one control. The median VEP latencies were significantly higher on days 14, 21, and 28 compared to baseline, with maximal latencies observed on day 21. The histological analyses on day 14 demonstrated inflammation with largely preserved myelin and axonal structures. Inflammation and demyelination with largely preserved axons were evident on days 21 and 28, which correlated with prolonged VEP latencies. These findings suggest that VEPs may be a reliable biomarker reflecting the optic nerve involvement in EAE. Moreover, the use of a minimally invasive device enables observation of VEP changes over time in MOG-EAE DA rats. Our findings may have important implications for testing the potential neuroprotective and regenerative effects of new therapies for CNS demyelinating diseases.Copyright © 2023 IBRO. Published by Elsevier Ltd. All rights reserved.

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