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Immunohistochemical staining and quantitative evaluation of glial fibrillary acidic protein (GFAP) were carried out in a stab wound model of neural trauma in the rat. Increased GFAP staining was detected in reactive cortical astrocytes in the vicinity of the wound at 3, 7, and 30 d following injury. Western blots immunostained for GFAP also demonstrated an increase in GFAP in homogenates from the lesioned cortex, compared to the contralateral control side, on days 3, 7, and 30. Specific activity of GFAP expressed as a ratio of lesion/control values showed a fivefold increase from day 0 to day 7, with no further change on day 30. We conclude that neural trauma elicits a quantitative increase in GFAP in the rat cortex during the first week following injury. This increase correlates with both astrocyte hyperthrophy and proliferation. Thus, specific activity of GFAP is a reliable indicator of the onset and progression of astrogliosis in neural trauma.
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