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Role of astrocytes in pathogenesis of ischemic brain injury

Neurotoxicity Research volume 3, pages 205–221 (2001)Cite this article

Abstract

Astrocytes play an important role in the homeostasis of the CNS both in normal conditions and after ischemic injury. The swelling of astrocytes is observed during and several seconds after brain ischemia. Then ischemia stimulates sequential morphological and biochemical changes in glia and induces its proliferation. Reactive astrocytes demonstrate stellate morphology, increased glial fibrillary acidic protein (GFAP) immunoreactivity, increased number of mitochondria as well as elevated enzymatic and non-enzymatic antioxidant activities. Astrocytes can re-uptake and metabolize glutamate and in this way they control its extracellular concentration. The ability of astrocytes to protect neurons against the toxic action of free radicals depends on their specific energy metabolism, high glutathione level, increased antioxidant enzyme activity (catalase, superoxide dismutase, glutathione peroxidase) and overexpression of antiapoptoticbcl-2 gene. Astrocytes produce cytokines (TNF-±, IL-1, IL-6) involved in the initiation and maintaining of immunological response in the CNS. In astrocytes, like in neurones, ischemia induces the expression of immediate early genes:c-fos, c-jun, fos B, jun B, jun D, Krox-24, NGFI-B and others. The protein products of these genes modulate the expression of different proteins, both destructive ones and those involved in the neuroprotective processes.

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  1. Department of Pharmacology, Silesian Medical University, Medyków 18 St., 40-752, Katowice, Poland

    Bozena Gabryel & Henryk I. Trzeciak

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  1. Bozena Gabryel
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Gabryel, B., Trzeciak, H.I. Role of astrocytes in pathogenesis of ischemic brain injury. neurotox res 3, 205–221 (2001). https://doi.org/10.1007/BF03033192

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Keywords

  • Astrocytes
  • Ischemia
  • Energy metabolism
  • Glutamate
  • Adenosine
  • Calcium
  • Immediate early genes
  • Cytokines