title: Ischemic preconditioning relieves ischemia/reperfusion injury of hippocampus neurons in rat by inhibiting p53 and bax expressions.
abstract: OBJECTIVE
  To examine whether ischemic preconditioning (IPC) can protect neuron against delayed death in CA1 subfield of hippocampus following reperfusion of a lethal ischemia in rats, and explore the role of p53 and bax in this process.
  
  
  METHODS
  We examined the effect of IPC on delayed neuron death, neuron apoptosis, expressions of p53 and bax gene in the CA1 area of hippocampus in the rats using HE staining, flow cytometry, RT-PCR, and immunohistochemistry technique.
  
  
  RESULTS
  IPC enhanced the quantity of survival cells in the CA1 region of hippocampus (216 +/- 9 cells/0.72 mm2 vs. 30 +/- 5 cells/0.72 mm2, P < 0.01) , decreased the percentages of apoptotic neurons of hippocampus caused by ischemia/reperfusion (2.06% +/- 0.21% vs. 4.27% +/- 0.08%, P < 0.01 ), and weakened the expressions of p53 and bax gene of hippocampus compared with ischemia/reperfusion without IPC.
  
  
  CONCLUSIONS
  IPC can protect the neurons in the CA1 region of hippocampus against apoptosis caused by ischemia/reperfusion, and this process may be related to the reduced expressions of p53 and bax.
authors.affiliation: Institute of Physiology, School of Medicine, Shandong University, Jinan 250012.
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Liu
authors.forename: Jing-Xin
authors.initials: JX
authors.lastname: Li
authors.forename: Lian-Bi
authors.initials: LB
authors.lastname: Chen
mesh_terms: D000818:Animals; D005786:Gene Expression Regulation; D016158:Genes, p53; D006624:Hippocampus / Q000293:injuries*; D019194:Ischemic Preconditioning / Q000379:methods*; D009474:Neurons / Q000502:physiology*; D051381:Rats; D015427:Reperfusion Injury / Q000517:prevention & control*; D016159:Tumor Suppressor Protein p53 / Q000037:antagonists & inhibitors / Q000235:genetics*; D051028:bcl-2-Associated X Protein / Q000037:antagonists & inhibitors / Q000235:genetics*
chemical_list: D016159:Tumor Suppressor Protein p53; D051028:bcl-2-Associated X Protein