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Transient increase in glutamic acid decarboxylase mRNA in the cerebral cortex following focal cortical lesion in the rat

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Summary

In situ hybridization histochemistry (ISHH) was used to study the expression of glutamic acid decarboxylase (GAD) mRNA changes in the rat cerebral cortex following unilateral frontal and somatosensory cortical lesion by devascularisation. 4 days after the lesion, a significant transient increase in GAD mRNA level in the ipsilateral cortex was observed when compared with contralateral, ipsi-sham operated and ipsi-normal control cortices. The change occurred throughout the ipsilateral neocortex, with no significant difference between the magnitude of increase in frontal, parieto-occipital, parieto-temporal, cingulate or retrosplenial areas; no obvious change was seen in pyriform, entorhinal or hippocampal cortices. This unexpected GAD mRNA increase in neocortex may be part of a long term adaptive functional alteration and changes in the gene expression of the cerebral cortex following focal cortical injury.

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Najlerahim, A., Showell, D.G.L. & Pearson, R.C.A. Transient increase in glutamic acid decarboxylase mRNA in the cerebral cortex following focal cortical lesion in the rat. Exp Brain Res 87, 113–118 (1991). https://doi.org/10.1007/BF00228512

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Key words

  • Cortex
  • Glutamic acid decarboxylase
  • In situ hybridization
  • mRNA
  • Rat