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- W2029905908 abstract "Lesions of the central nervous system result in invasion of peripheral phagocytes and/or in situ activation and proliferation of microglia, depending on the direct or indirect nature of the injury. Neurotoxins which are widely used to induce neurodegeneration have been reported to elicit a pure microglial reaction when administered intraventricularly. However, the mechanical lesion at the injection site, although remote from the lesioned area, could give access to blood-derived cells. Therefore, this study compares the phagocytic reaction occurring after a traumatic lesion of the brain causing a breakdown of the blood-brain barrier (BBB), or after degeneration of the inferior olivary neurons induced by intraperitoneal administration of 3-acetylpyridine, a process that respects the integrity of the BBB as suggested by the results of intravascular injection of Evans blue. The identification of the macrophages at the lesion site used specific binding of the B4 isolectin from Griffonia simplicifolia, preloading of the peripheral monocytes/macrophages with trypan blue, and characteristic morphological features. In traumatically lesioned rats, the lectin-labeled macrophages were mainly large rounded peripheral cells recruited 1-3 days postlesion, whereas in chemically lesioned rats, the cellular reaction appeared 24-36 h postinjection and peaked between 3 and 12 days before undergoing a slow decline. Lectin binding and morphological characteristics indicated that these small cells were reactive microglia. These results confirm that a brain injury leaving the BBB intact involves essentially the recruitment and/or the proliferation of microglia." @default.
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- W2029905908 date "1994-07-01" @default.
- W2029905908 modified "2023-09-26" @default.
- W2029905908 title "Contribution of Peripheral Macrophages and Microglia to the Cellular Reaction after Mechanical or Neurotoxin-Induced Lesions of the Rat Brain" @default.
- W2029905908 doi "https://doi.org/10.1006/exnr.1994.1114" @default.
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