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Activation of JAK/STAT signalling in neurons following spinal cord injury in mice
Author(s) -
Yamauchi Katsuaki,
Osuka Koji,
Takayasu Masakazu,
Usuda Nobuteru,
Nakazawa Ayami,
Nakahara Norimoto,
Yoshida Mitsuhiro,
Aoshima Chihiro,
Hara Masahito,
Yoshida Jun
Publication year - 2006
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2005.03559.x
Subject(s) - stat protein , stat3 , phosphorylation , jak stat signaling pathway , janus kinase , stat , western blot , spinal cord , signal transduction , immunohistochemistry , biology , kinase , spinal cord injury , microbiology and biotechnology , cancer research , medicine , chemistry , neuroscience , biochemistry , gene , receptor tyrosine kinase
The Janus kinase (JAK)/signal transducer and activator of transcription (STAT) signalling pathway is one of the most important in transducing signals from the cell surface to the nucleus in response to cytokines. In the present study, we investigated chronological alteration and cellular location of JAK1, STAT3, phosphorylated ( p )‐Tyr1022/1023‐JAK1, p ‐Tyr705‐STAT3, and interleukin‐6 (IL‐6) following spinal cord injury (SCI) in mice. Western blot analysis showed JAK1 to be significantly phosphorylated at Tyr1022/1023 from 6 h after SCI, peaking at 12 h and gradually decreasing thereafter, accompanied by phosphorylation of STAT3 at Tyr705 with a similar time course. ELISA analysis showed the concentration of IL‐6 in injured spinal cord to also significantly increase from 3 h after SCI, peaking at 12 h, then gradually decreasing. Immunohistochemistry revealed p ‐Tyr1022/1023‐JAK1, p ‐Tyr705‐STAT3, and IL‐6 to be mainly expressed in neurons of the anterior horns at 12 h after SCI. Pretreatment with a JAK inhibitor, AG‐490, suppressed phosphorylation of JAK1 and STAT3 at 12 h after SCI, reducing recovery of motor functions. These findings suggest that SCI at the acute stage produces IL‐6 mainly in neurons of the injured spinal cord, which activates the JAK/STAT pathway, and that this pathway may be involved with neuronal response to SCI.