4.6 Review

Inflammation in multiple sclerosis: consequences for remyelination and disease progression

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Summary: Multiple sclerosis (MS) is characterized by remyelination failure, axonal degeneration, and progressive worsening of motor functions. Animal models of demyelination are commonly used to develop and evaluate therapies for MS. In this study, the focal internal capsule (IC) demyelination mouse model was used to examine the effect of clemastine, an anti-muscarinic drug that promotes remyelination, on motor functions. Clemastine administration improved motor function and increased myelination in the IC lesions, suggesting that the IC demyelination model is useful for evaluating changes in motor functions following pharmacological treatments.

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Summary: This study explores the regional distribution of myelin repair in multiple sclerosis and its relationship with neurodegeneration. The findings show that periventricular white matter lesions in multiple sclerosis patients exhibit selective failure of remyelination, which is associated with choroid plexus enlargement and grey matter atrophy. The study highlights the importance of myelin repair in protecting against cortical damage in multiple sclerosis.
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Summary: The study investigates the effects of age and differentiation on the myelination potential of human OL lineage cells. The results show that pediatric progenitor and mature cells have a stronger capacity for ensheathing nanofibers compared to their adult counterparts. Additionally, certain gene expressions are higher in pediatric cells. These findings suggest potential targets for enhancing remyelination therapies.

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Summary: This study examines DNA methylation in glial cells to uncover molecular changes underlying Multiple Sclerosis (MS) neuropathology. The researchers identified significant differential methylation positions between MS patients and controls, and found alterations in processes related to cellular motility, metabolic processes, neuroinflammation, and signaling. Genes affected by the methylation changes showed transcriptional differences in the brains of MS patients. The findings suggest a multicellular reaction in response to inflammation in the absence of lesional insult.

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Sarah A. Neely et al.

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Richard Creswell et al.

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Versican promotes T helper 17 cytotoxic inflammation and impedes oligodendrocyte precursor cell remyelination

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Summary: Remyelination efficiency decreases with age, particularly in patients with multiple sclerosis. Bexarotene, a retinoid-X receptor agonist, only shortens the visual evoked potential latency in patients under 42 years old and increases the magnetization transfer ratio of deep gray matter lesions in those under 43 years old.

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