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Magnetic resonance imaging characterization of different experimental autoimmune encephalomyelitis models and the therapeutic effect of glatiramer acetate.

Abstract：

:The roles of inflammation and degeneration as well as of gray matter abnormalities in multiple sclerosis (MS) and its animal model experimental autoimmune encephalomyelitis (EAE) are controversial. We analyzed the pathological manifestations in two EAE models, the chronic oligodendrocyte glycoprotein (MOG)-induced versus the relapsing-remitting proteolipid protein (PLP)-induced, along the disease progression, using advanced magnetic resonance imaging (MRI) parameters. The emphasis of this study was the overall assessment of the whole brain by histogram analysis, as well as the detection of specific affected regions by voxel based analysis (VBA) using quantitative T2, magnetization transfer ratio (MTR) and diffusion tensor imaging (DTI). Brains of EAE-inflicted mice from both models revealed multiple white and gray matter areas with significant changes from naïve mice for all MRI parameters. Ventricle swelling was more characteristic to the PLP-induced model. Decreased MTR values and increased apparent diffusion coefficient (ADC) were observed mainly in MOG-induced EAE, indicative of macromolecular loss and structural CNS damage involvement in the chronic disease. The MS drug glatiramer acetate (GA), applied either as prevention or therapeutic treatment, affected all the MRI pathological manifestations, resulting in reduced T2 values and ventricle volume, elevated MTR and decreased ADC, in comparison to untreated EAE-inflicted mice. In accord, immunohistochemical analysis indicated less histological damage and higher amount of proliferating oligodendrocyte progenitor cells after GA treatment. The higher brain tissue integrity reflected by the MRI parameters on the level of the whole brain and in specific regions supports the in situ anti-inflammatory and neuroprotective consequences of GA treatment.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Aharoni R,Sasson E,Blumenfeld-Katzir T,Eilam R,Sela M,Assaf Y,Arnon R

doi

10.1016/j.expneurol.2012.11.004

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

130-44

eissn

0014-4886

issn

1090-2430

pii

S0014-4886(12)00421-9

journal_volume

240

pub_type

杂志文章

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Magnetic resonance imaging characterization of different experimental autoimmune encephalomyelitis models and the therapeutic effect of glatiramer acetate.