Abdallah, A., Shamaa, A., El-Tookhy, O. (2020). Ethidium Bromide Induced Demyelination of The Central Nervous System in A Dog Model of Secondary Progressive Multiple Sclerosis. test, 2(1), 57-67. doi: 10.21608/jcvr.2020.90224
Ahmed Nour Eldine Abdallah; Ashraf Aly Shamaa; omar salah El-Tookhy. "Ethidium Bromide Induced Demyelination of The Central Nervous System in A Dog Model of Secondary Progressive Multiple Sclerosis". test, 2, 1, 2020, 57-67. doi: 10.21608/jcvr.2020.90224
Abdallah, A., Shamaa, A., El-Tookhy, O. (2020). 'Ethidium Bromide Induced Demyelination of The Central Nervous System in A Dog Model of Secondary Progressive Multiple Sclerosis', test, 2(1), pp. 57-67. doi: 10.21608/jcvr.2020.90224
Abdallah, A., Shamaa, A., El-Tookhy, O. Ethidium Bromide Induced Demyelination of The Central Nervous System in A Dog Model of Secondary Progressive Multiple Sclerosis. test, 2020; 2(1): 57-67. doi: 10.21608/jcvr.2020.90224

Ethidium Bromide Induced Demyelination of The Central Nervous System in A Dog Model of Secondary Progressive Multiple Sclerosis

Journal of Current Veterinary Research
Article 7, Volume 2, Issue 1, April 2020, Pages 57-67    PDF (903.07 K)
Document Type: Original Article
DOI: 10.21608/jcvr.2020.90224
Authors
Ahmed Nour Eldine Abdallah* 1; Ashraf Aly Shamaa2; omar salah El-Tookhy2
1Pathology department, Animal Health Research Institute, Dokki, Giza
2Surgery Department, Faculty of Veterinary Medicine, Cairo University.
Abstract
Demyelinating lesions induced by intraspinal injection of gliotoxin have been studied for many years in order to gain insights into reasons for remyelination failure and in order to improve the understanding of the axonal conduction disorders in multiple sclerosis (MS). This work aimed to develop a model resembling clinical human-progressive MS where Ethidium bromide induced demyelination in dogs’ spinal cord is experimented. All animals received intraspinal injection of 20 μl of 0.1 % Ethidium bromide in the lateral columns using a microneedle syringe attached to a capillary tube. All animals were evaluated clinically with gait analysis, MRI imaging of the spinal cord and electron microscopic analysis. Results showed progressive clinical disability beginning from the third day post induction till 28 days; confirmed by the appearance of sclerotic plaques by MRI and hyperintense regions at the lateral columns of the spinal cord. The electron microscopic pictures showed progressive degenerative lesions characterized by death of oligodendrocytes and astrocytes leading to demyelination and vacuolation followed by axonal damage without signs of endogenous regeneration. Unique features were revealed compared to previous models; this dog model reached a more progressive form of MS where spontaneous remyelination was not observed till 28 days post induction. These findings support that dogs provide an alternative large model to study progressive MS.

Keywords
Demyelination - Dog Model - Ethidium Bromide; Spinal Cord - Multiple Sclerosis
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