J Biol Chem 2005,
PMID: 15695523
Song, Jin H; Wang, Chen Xu; Song, Doyoun K; Wang, Peng; Shuaib, Ashfaq; Hao, Chunhai
Interferon gamma (IFN-gamma) is a cytokine predominantly involved in antiproliferative and antiviral responses, immune surveillance, and tumor suppression. However, it has been shown that IFN-gamma is also involved in central nervous system development. Here we studied the underlying mechanism for IFN-gamma-induced neuronal differentiation using the human neuroblastoma Paju cell line. Our results indicate that IFN-gamma treatment led to neurite outgrowth followed by growth arrest in the G1 phase of the cell cycle. IFN-gamma induced ERK1/2 phosphorylation and subsequently the transcription factor early gene response 1, which in turn up-regulated p35 expression and increased cyclin-dependent kinase 5 (Cdk5) activity. IFN-gamma-induced neurite outgrowth was abolished by the treatment of MEK1/2 kinase inhibitors, such as U0126 and PD98059, which inhibit the ERK1/2 activation and subsequently prevent the up-regulation of p35 expression and Cdk5 activity. In agreement with the role of p35-Cdk5 in neuronal differentiation, small interfering RNA targeting Cdk5 abrogate the IFN-gamma-induced neurite outgrowth. Together, these results demonstrate for the first time that IFN-gamma-triggered neuronal differentiation mediated through the up-regulation of p35-associated Cdk5 depends on the activation of the ERK1/2 pathway. Therefore, the present study suggests that IFN-gamma is not only involved in tumorigenicity but also involved in neurogenesis by regulating cell proliferation and differentiation.
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Text Mining Data
neuronal differentiation → IFN-gamma: "
Here we studied the underlying mechanism for
IFN-gamma induced
neuronal differentiation using the human neuroblastoma Paju cell line
"
transcription factor → IFN-gamma: "
IFN-gamma induced ERK1/2 phosphorylation and subsequently the transcription factor early gene response 1, which in turn up-regulated p35 expression and increased cyclin dependent kinase 5 (Cdk5) activity
"
ERK1/2 → IFN-gamma: "
IFN-gamma induced ERK1/2 phosphorylation and subsequently the transcription factor early gene response 1, which in turn up-regulated p35 expression and increased cyclin dependent kinase 5 (Cdk5) activity
"
transcription factor — ERK1/2: "
IFN-gamma induced ERK1/2 phosphorylation and subsequently the transcription factor early gene response 1, which in turn up-regulated p35 expression and increased cyclin dependent kinase 5 (Cdk5) activity
"
neuronal differentiation ⊣ p35-Cdk5: "
In agreement with the role of p35-Cdk5 in neuronal differentiation , small interfering RNA targeting Cdk5 abrogate the IFN-gamma induced neurite outgrowth
"
neuronal differentiation ⊣ p35-Cdk5: "
In agreement with the role of p35-Cdk5 in neuronal differentiation , small interfering RNA targeting Cdk5 abrogate the IFN-gamma induced neurite outgrowth
"
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