Abstract
The present study investigated the activation of extracellular-signal-regulated kinase (ERK) and the potential role of interleukin-1 beta (IL-1β) in the brain's response to focal brain ischemia in the permanent middle cerebral artery occlusion (pMCAO) model. Phosphorylated ERK p44 and p42 were increased time-dependently and significantly 18- and 28-fold, respectively, at 24-h post-pMCAO. Similarly, IL-1β protein levels were significantly increased with the peak at 24 h in the lesioned core of the ischemic hemisphere compared to the contralateral side. Previous studies using various stimuli have shown ERK-dependent IL-1 induction. The results from our study suggest that this relation may also exist in vivo in ischemic brain tissue. Based on the progressive nature of IL-1 induction, we hypothetized that inhibition of interleukin-converting enzyme (ICE) could provide an extended time-window for neuroprotection. Therefore, we applied N-benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone (zVAD·fmk), an ICE blocker 3 or 6 h after pMCAO. Reductions of infarct volume, however, were not observed. Taken together with previous results, where we showed protective activity of zVAD·fmk when given immediately after pMCAO, we conclude that the time window for zVAD·fmk is less than 3 h.
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Skifter, D.A., Allegrini, P.R., Wiessner, C. et al. Similar Time-Course of Interleukin-1 Beta Production and Extracellular-Signal-Regulated Kinase (ERK) Activation in Permanent Focal Brain Ischemic Injury. Metab Brain Dis 17, 131–138 (2002). https://doi.org/10.1023/A:1019917803470
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DOI: https://doi.org/10.1023/A:1019917803470