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

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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.

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Authors and Affiliations

  1. Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003, Porto Alegre, RS, Brazil

    Angela Terezinha de Souza Wyse

  2. Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003, Porto Alegre, RS, Brazil

    Emílio Luiz Streck, Paulo Worm, André Wajner, Fabiana Ritter & Carlos Alexandre Netto

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  1. Angela Terezinha de Souza Wyse
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  2. Emílio Luiz Streck
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de Souza Wyse, A.T., Streck, E.L., Worm, P. et al. Preconditioning Prevents the Inhibition of Na+,K+-ATPase Activity after Brain Ischemia. Neurochem Res 25, 971–975 (2000). https://doi.org/10.1023/A:1007504525301

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