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• W2012241026 abstract "Gliosis is a repair process of lesions appearing in the central nervous system (CNS). Although gliosis by astrocytes (astrocytic gliosis) has been well documented, that by microglia (microglial gliosis) remains poorly understood. In the present study we induced experimental autoimmune encephalomyelitis (EAE) in Lewis rats and examined microglial and astroglial reactions to EAE lesions at various stages of the disease by immunohistochemistry. For the demonstration of microglia and astrocytes, antibodies against complement receptor type 3 (OX42) and glial fibrillary acidic protein (GFAP) were used, respectively. It was revealed that the whole course of microglial and astroglial reactions to EAE lesions is divisible into three stages, i.e., initial, peak and recovery stages. Microglial and astroglial reactions to EAE lesions at each stage correspond well with the clinical and histological stages of EAE. At the initial stage, rats showed mild clinical signs and a few inflammatory foci were found in the CNS. Microglia were increased in number in close association with inflammatory cell aggregates, whereas astrocytes showed no significant reaction in spite of the presence of inflammatory cells. At the peak stage, rats showed full-blown EAE and the number of inflammatory cells reached maximum. The most characteristic finding at this stage was 'encasement' of inflammatory lesions by astrocytic fibers. Microglia were increased in number, but association of microglia with lesions was prevented by astrocytes. Interestingly, however, such characteristic distribution of microglia and astrocytes was not observed at the recovery stage. Residual inflammatory cell aggregates were intermingled with dense microglial and astrocytic gliosis, forming 'micro-astroglial scars'. Double immunofluorescence staining with anti-GFAP and anti-bromodeoxyuridine (BrdU), or with OX42 and anti-BrdU revealed that BrdU-incorporated microglia, but not astrocytes, were present mainly at the initial and peak stages, suggesting that microglia would proliferate by cell division to create gliosis, whereas astrocytic gliosis would be a result of migration of astrocytes and/or up-regulation of expression of GFAP molecule. Taken together with previous in vitro findings that microglia, but not astrocytes, stimulate encephalitogenic T cell proliferation, these in vivo findings suggest that microglia augment, whereas astrocytes suppress, inflammatory processes in the CNS." @default.
• W2012241026 created "2016-06-24" @default.
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• W2012241026 date "1992-03-01" @default.
• W2012241026 modified "2023-10-01" @default.
• W2012241026 title "Microglial and astroglial reactions to inflammatory lesions of experimental autoimmune encephalomyelitis in the rat central nervous system" @default.
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• W2012241026 doi "https://doi.org/10.1016/0165-5728(92)90152-b" @default.
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