Interleukin-6 activates signal transducer and activator of transcription and mitogen-activated protein kinase signal transduction pathways and induces de novo protein synthesis in human neuronal cells.

Abstract:

:Interleukin-6 (IL-6) is involved in the pathophysiology of various diseases of the CNS. Because the molecular mechanism of action of this cytokine in human neurons is not well understood, we were interested in characterizing and defining a model system for IL-6-induced activation of signal transduction cascades, transcriptional activation, and protein synthesis in human neuronal cells. We show that IL-6 leads to transcriptional activation of signal transducer and activator of transcription 3 (STAT3) in human SH-SY5Y neuroblastoma cells. IL-6-induced activation and translocation of STAT3 and to a lesser degree STAT1 but not STAT5 are demonstrated. STAT3 is phosphorylated on Tyr705 and Ser727 residues on stimulation with IL-6, suggesting maximal activation of transcription. We also show IL-6-induced phosphorylation of p42/44 mitogen-activated protein (MAP) kinase, providing evidence for MAP kinase pathway activation. The physiological relevance of our results is confirmed by IL-6-induced phosphorylation of key signaling proteins of both STAT and MAP kinase pathway in rat primary hippocampal neurons. Furthermore, de novo protein synthesis on IL-6 activation is demonstrated.

journal_name

J Neurochem

authors

Schumann G,Huell M,Machein U,Hocke G,Fiebich BL

keywords:

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

2009-17

issue

5

eissn

0022-3042

issn

1471-4159

journal_volume

73

pub_type

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