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• W2528080441 abstract "Resident microglia and recruited macrophages are major contributors to the post-ischemic inflammatory response. Initially considered functionally homogeneous populations, data now suggest distinct but still controversial roles after brain injury. Using a model of conditional monocyte/macrophage depletion we studied the contribution of these myeloid cells to brain lesion progression after ischemia, and their influence on the ischemic inflammatory environment. Male CD11b-DTR transgenic mice, expressing the human diphtheria toxin receptor under the control of the CD11b promoter, were treated with diphtheria toxin to induce monocyte/macrophage depletion. Twenty four hours later the middle cerebral artery was permanently occluded. The ischemic lesion was measured 24h after injury. At the same time microglia and macrophage activation and polarization were assessed by quantitative immunohistochemistry and confocal microscopy for CD45high, CD11b, CD68, CD16/32, iNOS, Arg1, Ym1, and CD206, and gene expression was investigated on CD11b+ sorted cells. Depletion of monocytes/macrophages worsened the ischemic lesion within 24h after the ischemic insult. This effect was associated with higher M1/M2 polarization ratio in the ischemic lesion. Moreover, depletion increased the expression of M1 phenotypic markers on CD11b positive cells. Gene expression on CD11b+ sorted cells indicated a selective increase of iNOS and lower Arg1 mRNA expression than in non depleted mice. Depletion of monocytes/macrophages increases the ischemic lesion, an effect accompanied by an increase in the M1/M2 polarization ratio of microglia and macrophages in the ischemic area. Thus in ischemic injury recruited monocytes/macrophages may control an excessive M1 pro-inflammatory response, suggesting their ability to drive M2 protective polarization." @default.
• W2528080441 created "2016-10-14" @default.
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• W2528080441 date "2016-12-01" @default.
• W2528080441 modified "2023-10-16" @default.
• W2528080441 title "Macrophages are essential for maintaining a M2 protective response early after ischemic brain injury" @default.
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• W2528080441 doi "https://doi.org/10.1016/j.nbd.2016.09.017" @default.
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