Increase in p53 protein expression following cortical infarction in the spontaneously hypertensive rat

Brain Res. 1999 Aug 7;837(1-2):38-45. doi: 10.1016/s0006-8993(99)01652-2.

Abstract

Using stroke-prone spontaneously hypertensive (SH-SP) rats with permanent occlusion of the middle cerebral artery (MCA), we investigated the expression of wild type p53 (wt-p53) protein and the occurrence of DNA fragmentation in cerebral neurons after ischemia. Three days following MCA occlusion, terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling (TUNEL staining) revealed a distinct pattern of nuclear staining in many neurons around the ischemic core. On the lesioned side of the cerebral cortex one day after MCA occlusion, wt-p53 immunoreactivity was observed specifically in the cortical neurons, in the same regions as the TUNEL staining. Mutant type p53 (mt-p53) immunoreactivity was not observed at any time following MCA occlusion. These findings suggest that wt-p53 dependent cell death of cortical neurons occurred in the ischemic periphery following cerebral ischemia and that this pathway for the induction of cell death may play an important role in the exaggeration of cerebral ischemic injury.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain / metabolism*
  • Brain / pathology
  • Cerebral Cortex / metabolism
  • Cerebral Cortex / pathology
  • Cerebral Infarction / metabolism*
  • Cerebral Infarction / pathology
  • DNA Fragmentation
  • Gene Expression Regulation
  • Immunohistochemistry
  • In Situ Nick-End Labeling
  • Ischemic Attack, Transient / metabolism
  • Ischemic Attack, Transient / pathology
  • Male
  • Neurons / metabolism*
  • Neurons / pathology
  • Rats
  • Rats, Inbred SHR
  • Tumor Suppressor Protein p53 / analysis*
  • Tumor Suppressor Protein p53 / genetics

Substances

  • Tumor Suppressor Protein p53