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• W2891725583 abstract "Background and Purpose— Type 2 diabetes mellitus (T2DM) is a major comorbidity that exacerbates ischemic brain injury and worsens functional outcome after stroke. T2DM is known to aggravate white matter (WM) impairment, but the underlying mechanism is not completely understood. This study was designed to test the hypothesis that T2DM impedes poststroke WM recovery by suppressing both oligodendrogenesis and beneficial microglia/macrophage responses. Methods— Permanent distal middle cerebral artery occlusion was performed in wild-type, homozygous diabetic db/db, and heterozygous db/+ mice. The adhesive removal, open field, and Morris water maze tests were used to assess neurobehavioral outcomes. Neuronal tissue loss, WM damage, oligodendrogenesis, and microglia/macrophage responses were evaluated up to 35 days after stroke. The functional integrity of WM was measured by electrophysiology. Primary microglia-oligodendrocyte cocultures were used for additional mechanistic studies. Results— T2DM exacerbated structural damage and impaired conduction of compound action potentials in WM 35 days after stroke. The deterioration in WM integrity correlated with poor sensorimotor performance. Furthermore, T2DM impaired the proliferation of oligodendrocyte precursor cells and the generation of new myelinating oligodendrocytes. T2DM also promoted a shift of microglia/macrophage phenotype toward the proinflammatory modality. Coculture studies confirmed that microglia/macrophage polarization toward the proinflammatory phenotype under high glucose conditions suppressed oligodendrocyte precursor cell differentiation. Conclusions— Deterioration of WM integrity and impairments in oligodendrogenesis after stroke are associated with poor long-term functional outcomes in experimental diabetes mellitus. High glucose concentrations may shift microglia/macrophage polarization toward a proinflammatory phenotype, significantly impairing oligodendrocyte precursor cell differentiation and WM repair." @default.
• W2891725583 created "2018-09-27" @default.
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• W2891725583 date "2018-10-01" @default.
• W2891725583 modified "2023-10-12" @default.
• W2891725583 title "Diabetes Mellitus Impairs White Matter Repair and Long-Term Functional Deficits After Cerebral Ischemia" @default.
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• W2891725583 doi "https://doi.org/10.1161/strokeaha.118.021452" @default.
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