c-Jun N-terminal kinase (JNK) and JNK interacting protein response in rat brain after transient middle cerebral artery occlusion

Takeshi Hayashi, Ken Ichi Sakai, Chihoko Sasaki, Wen Ri Zhang, Hitoshi Warita, Koji Abe

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

c-Jun response is involved in the development of ischemic brain injury, which is activated by c-Jun N-terminal kinase-1 (JNK-1). The activity of JNK-1 is strictly regulated, and only the phosphorylated form of JNK (phospho-JNK) which is translocated to the nucleus has an ability to activate c-Jun response. There is a protein which inhibits JNK-1 activation, and known as JNK interacting protein-1 (JIP-1). In this study, we investigated change in JNK-1, phospho-JNK, and JIP-1 immunoreactivity in rat brain after transient middle cerebral artery (MCA) occlusion. Immunoreactive JNK-1 was scant in the sham-control brain, but it was induced at 1 h after reperfusion, which was slightly increased at 3 h of reperfusion. By contrast, phospho-JNK remained negative till 3 h. At 8 h, JNK-1 and phospho-JNK became distinctly positive, and nuclei as well as cytoplasm were stained. Thereafter, immunoreactivity for JNK-1 and phospho-JNK became furthermore dense, and most neurons revealed positively stained nuclei. Immunoreactivity for JIP-1 remained negative till 8 h of reperfusion, but at 24 and 72 h, cytoplasm of cortical neurons at the MCA boundary area was positively stained. This JIP-1 induction got behind the JNK-1 activation, and therefore, may be a vain effort for neurons to survive. Inhibition of JNK-1 activation might become an innovative means of therapy for stroke treatment in the future. Copyright (C) 2000 Elsevier Science Ireland Ltd.

Original languageEnglish
Pages (from-to)195-199
Number of pages5
JournalNeuroscience Letters
Volume284
Issue number3
DOIs
Publication statusPublished - Apr 28 2000

    Fingerprint

Keywords

  • C-Jun N-terminal kinase
  • C-Jun N-terminal kinase interacting protein
  • Immunohistochemistry
  • Ischemia
  • Rat

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this