Reduced postischemic apoptosis in the hippocampus of mice deficient in interleukin-1

Hidekatsu Mizushima, Chengji Zhou, Kenji Dohi, Reiko Horai, Masahide Asano, Yoichiro Iwakura, Takahiro Hirabayashi, Satoru Arata, Shigeo Nakajo, Atsushi Takaki, Hirokazu Ohtaki, Seiji Shioda

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The cytokine interleukin-1 (IL-1) has been implicated in ischemic brain damage, because the IL-1 receptor antagonist markedly inhibits experimentally induced neuronal loss. However, to date, no studies have demonstrated the involvement of endogenous IL-1α and IL-1β in neurodegeneration. We report here, for the first time, that mice lacking IL-1α/β (double knockout) exhibit markedly reduced neuronal loss and apoptotic cell death when exposed to transient cardiac arrest. Furthermore, we show that, despite the reduced neuronal loss, phosphorylation of JNK/SAPK (c-Jun NH2-terminal protein kinase/stress activated protein kinase) and p38 enzymes remain elevated in IL-1 knockout mice. In contrast, the inducible nitric oxide (iNOS) immunoreactivity after global ischemia was reduced in IL-1 knockout mice as compared with wild-type mice. The levels of nitrite (NO2 -) and nitrate (NO3 -) in the hippocampus of wild-type mice were increased with time after ischemia-reperfusion, whereas the increase was significantly inhibited in IL-1 knockout mice. These observations strongly suggest that endogenous IL-1 contributes to ischemic brain damage, and this influence may act through the release of nitric oxide by iNOS.

Original languageEnglish (US)
Pages (from-to)203-216
Number of pages14
JournalJournal of Comparative Neurology
Volume448
Issue number2
DOIs
StatePublished - 2002
Externally publishedYes

Keywords

  • Global ischemia
  • Knockout mice
  • Mitogen-activated protein kinase
  • Neurodegeneration
  • Nitric oxide

ASJC Scopus subject areas

  • Neuroscience(all)

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