Cited by 100Cytokine Signaling Pathways and InteractionsNerve injury and regenerationNeurogenesis and neuroplasticity mechanisms

Induction of Neurite Outgrowth by Interleukin-6 Is Accompanied by Activation of Stat3 Signaling Pathway in a Variant PC12 Cell (E2) Line

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Wu, Yvonne Y., Bradshaw, Ralph A.·1996·Journal of Biological Chemistry

Abstract

PC12-E2 cells, a stable variant subcloned from native cell populations, produce neurites in a rapid, transcription-independent manner upon exposure to nerve growth factor (NGF) or basic fibroblast growth factor (bFGF). They also give a similar morphological response to interleukin-6 (IL-6), which is, however, transcription-dependent and with a slower onset, a phenomenon basically not observed in native PC12 cells. The response profile of PC12-E2 cells to NGF and bFGF is similar to that observed for native PC12 cells pre-exposed (primed) to NGF, and such cells also respond to IL-6 in a fashion indistinguishable from PC12-E2 cells. Mechanistically, NGF and bFGF induce a sustained phosphorylation and activation of ERK1 and ERK2 in both cells, while IL-6 produces only a transient and weak tyrosine phosphorylation. However, it does stimulate a prolonged and biphasic tyrosine phosphorylation and nuclear translocation of Stat3 (signal transducers and activators of transcription 3; at least 24 h) and, to a lesser extent, Stat1. Gel shift and supershift analyses confirm that IL-6 predominantly activates Stat3 (and some Stat1) and stimulates sis-inducible element binding activity. Other members of the same cytokine subfamily, including ciliary neurotrophic factor and leukemia inhibitory factor, also cause a transient initial phase of tyrosine phosphorylation and activation of Stat1 and Stat3 (up to 1 h) but fail to stimulate a second phase of response and do not produce significant neurites. These results suggest that sustained signaling of either STAT or ERK pathways in PC12-E2 cells leads to induction of neuronal differentiation. However, only the latter is effective in native PC12 cells as the activation of Stat3 and Stat1 in native PC12 cells by IL-6 fails to induce neuronal differentiation. Thus, the response of PC12-E2 cells to IL-6 suggests the constitutive expression of a required factor(s) for differentiation, that is induced in native PC12 cells by NGF or bFGF (possibly by ERK activation), but not by IL-6 via Janus kinase/STAT activation. This factor(s), which has a sufficient half-life to allow primed cells to remain responsive to IL-6 for several days, is necessary but not sufficient for differentiation (as measured by neurite proliferation) to occur.

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Authors
Wu, Y. Y., & Bradshaw, R. A.
Affiliations
University of California, Irvine (US)
Corresponding author
Bradshaw, Ralph A.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1996-05
Volume
271
Issue
22
Pages
13023-13032
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2092217194
Cited by
100
References
62
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2021: 1 · 2020: 1 · 2017: 4 · 2014: 4 · 2013: 5 · 2012: 3
FWCI
3.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ag009735-18)
  • National Institute on Aging (AG-09735)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
interleukin-6, STAT3 signaling, STAT1, ERK1/2 activation, neuronal differentiation, neurite outgrowth, nerve growth factor, basic fibroblast growth factor, ciliary neurotrophic factor, leukemia inhibitory factor, Janus kinase, tyrosine phosphorylation, signaling crosstalk
MeSH terms
Acute-Phase Proteins, Animals, Base Sequence, Cell Nucleus, DNA, DNA-Binding Proteins, Fibroblast Growth Factors, Humans, Kinetics, Molecular Sequence Data, Nerve Growth Factors, Phosphorylation, Protein Binding, Protein Kinases, Tyrosine, Signal Transduction, Trans-Activators, Interleukin-6, Neurites, PC12 Cells, STAT1 Transcription Factor, STAT3 Transcription Factor, Rats

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