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Neuronal damage, glial response and cerebral metabolism after hypothermic forebrain ischemia in the rat

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Summary

We investigated the effect of 30°C whole body hypothermia on neuronal injury, astroglial reactivity and intracellular pH in rats subjected to 15 min of forebrain ischemia. Experimental groups included: (1) normothermic ischemia (n=8), ischemia induced under 37°C body temperature, (2) hypothermic ischemia (n=6), ischemia induced under 30°C body temperature. Cerebral intracellular pH was measured using in vivo 31P NMR spectroscopy over 7 days. Neuronal injury and astrocytic reactivity were evaluated using hematoxylin and eosin staining, and immunoreactivity to glial fibrillary acidic protein, respectively. Normothermic animals revealed significant alkalosis (P<0.01) at 48 h after ischemia compared to the pre-ischemic value. No significant intracellular pH change was detected after ischemia in the hypothermic group. Ischemic neuronal injury was prevented in the hypothermic animals, compared to the severe neuronal injury found in the normothermic animals (P<0.01). The marked astrocytosis of normothermic animals was significantly inhibited in the hypothermic animals (P<0.01). Our data indicate, that hypothermia significantly inhibits neuronal injury as well as post-ischemic alkalois and astrocytosis, induced by 15 min of forebrain ischemia in the rat.

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Authors and Affiliations

  1. Department of Neurology, Henry Ford Hospital, 2799 W-Grand Blvd., 48202, Detroit, MI, USA

    H. Chen, M. Chopp & Q. Jiang

  2. Department of Pathology, Henry Ford Hospital, 2799 W-Grand Blvd., 48202, Detroit, MI, USA

    J. H. Garcia

  3. Department of Physics, Oakland University, 48309, Rochester, MI, USA

    M. Chopp

Authors
  1. H. Chen
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  2. M. Chopp
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  3. Q. Jiang
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  4. J. H. Garcia
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Supported by NINDS grants NS23393 and NS29463

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Chen, H., Chopp, M., Jiang, Q. et al. Neuronal damage, glial response and cerebral metabolism after hypothermic forebrain ischemia in the rat. Acta Neuropathol 84, 184–189 (1992). https://doi.org/10.1007/BF00311393

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  • DOI: https://doi.org/10.1007/BF00311393

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