Neurochemical Research

, Volume 25, Issue 7, pp 971–975 | Cite as

Preconditioning Prevents the Inhibition of Na+,K+-ATPase Activity after Brain Ischemia

  • Angela Terezinha de Souza Wyse
  • Emílio Luiz Streck
  • Paulo Worm
  • André Wajner
  • Fabiana Ritter
  • Carlos Alexandre Netto
Article

Abstract

Application of single transient forebrain ischemia (ISC) in adult Wistar rats, lasting 2 or 10 min, caused inhibition of Na+,K+-ATPase activity in cytoplasmic membrane fractions of hippocampus and cerebral cortex immediately after the event. In the 2-min ISC group followed by 60 min of reperfusion, the enzyme inhibition was maintained in the cortex, while there was an increase in hippocampal enzyme activity; both effects were over 1 day after the event. However, in the 10-min ISC group enzyme inhibition had been maintained for 7 days in both cerebral structures. Interestingly, ischemic preconditioning (2-min plus 10-min ISC, with a 24-hour interval in between) prevented the inhibitory effect of ischemia/reperfusion on Na+,K+-ATPase activity observed either after a single insult of 2 min or 10 min ischemia. We suggest that the maintenance of Na+,K+-ATPase activity afforded by preconditioning be related to cellular neuroprotection.

Na+,K+-ATPase brain ischemia ischemic preconditioning 

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Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • Angela Terezinha de Souza Wyse
    • 1
  • Emílio Luiz Streck
    • 2
  • Paulo Worm
    • 2
  • André Wajner
    • 2
  • Fabiana Ritter
    • 2
  • Carlos Alexandre Netto
    • 2
  1. 1.Departamento de Bioquímica, ICBSUniversidade Federal do Rio Grande do SulPorto Alegre, RSBrazil
  2. 2.Departamento de Bioquímica, ICBSUniversidade Federal do Rio Grande do SulPorto Alegre, RSBrazil

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