Rat white matter injury model induced by endothelin-1 injection: technical modification and pathological evaluation

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Acta Neurobiologiae Experimentalis

Nencki Institute of Experimental Biology

Subject: Behavioral Sciences, Biomedical Sciences & Nutrition, Life Sciences, Medicine, Neurosciences

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ISSN: 0065-1400
eISSN: 1689-0035

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VOLUME 76 , ISSUE 3 (September 2016) > List of articles

Rat white matter injury model induced by endothelin-1 injection: technical modification and pathological evaluation

Hideaki Ono / Hideaki Imai * / Satoru Miyawaki / Hirofumi Nakatomi / Nobuhito Saito

Keywords : white matter injury, lacunar infarction, rat model, histopathology, retrograde tracing

Citation Information : Acta Neurobiologiae Experimentalis. Volume 76, Issue 3, Pages 212-224, DOI: https://doi.org/10.21307/ane-2017-021

License : (CC BY 4.0)

Published Online: 01-August-2017

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ABSTRACT

White matter injury is an important cause of functional disability of the brain. We comprehensively analyzed a modified endothelin-1 (ET-1) injection-induced white matter injury model in the rat which is very valuable for investigating the underlying mechanisms of subcortical ischemic stroke. ET-1 was stereotactically injected into the internal capsule of the rat. To avoid complications with leakage of ET-1 into the lateral ventricle, the safest trajectory angle to the target was established. Rats with white matter injury were extensively evaluated for structural changes and functional sequelae, using motor function tests, magnetic resonance (MR) imaging, histopathology evolution, volume estimation of the lesion, and neuroanatomical identification of affected neurons using the retrograde tracer hydroxystilbamidine. Optimization of the trajectory of the ET-1 injection needle provided excellent survival rate. MR imaging visualized the white matter injury 2 days after surgery. Motor function deficit appeared temporarily after the operation. Histological studies confirmed damage of axons and myelin sheaths followed by inflammatory reaction and gliosis similar to lacunar infarction, with lesion volume of less than 1% of the whole brain. Hydroxystilbamidine injected into the lesion revealed wide spatial distribution of the affected neuronal population. Compared with prior ET 1 injection models, this method induced standardized amount of white matter damage and temporary motor function deficit in a reproducible and safe manner. The present model is valuable for studying the pathophysiology of not only ischemia, but a broader set of white matter damage conditions in the lissencephalic brain.

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