Induction of transforming growth factor-β1 by basic fibroblast growth factor in rat C6 glioma cells and astrocytes is mediated by MEK/ERK signaling and AP-1 activation

Krishnan Michael Dhandapani, Mohammad M. Khan, F. Marlene Wade, Chandramohan G. Wakade, Virendra B. Mahesh, Darrell W Brann

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29 Citations (Scopus)

Abstract

Basic fibroblast growth factor (bFGF) and transforming growth factor-β1 (TGF-β1) play an important role in proliferation, differentiation, and survival of malignant gliomas and in normal glial cell biology. Because of these critical roles, potential interactions between these key growth factors were investigated. We previously demonstrated that bFGF potently stimulates TGF-β1 release from rat glioma cells. The purpose of the present study was to elucidate the mechanism(s) of this regulatory effect, establish its functional importance, and examine whether it extends to nontransformed rat hypothalamic astrocytes (RHA). The results revealed that RHA express the high-affinity FGF(1-4) receptors, and similarly to glioma cells, bFGF stimulated TGF-β1 release in an isoform-specific manner. A mediatory role for ERK signaling in bFGF-induced TGF-β release was suggested by the fact that MEK1 inhibition prevented this effect. Additionally, bFGF enhanced MEK1/2 phosphorylation and ERK activation/nuclear translocation, which culminated in increased activity of AP-1-mediated gene transcription. bFGF markedly induced TGF-β1 mRNA levels in an isoform-specific manner, an effect that was dependent on MEK/ERK/AP-1 signaling. Functionally, bFGF-induced proliferation of glioma cells was attenuated by MEK/ERK inhibition or immunoneutralization of TGF-β1, suggesting that this pathway may have important implications for brain tumor progression.

Original languageEnglish (US)
Pages (from-to)1033-1045
Number of pages13
JournalJournal of Neuroscience Research
Volume85
Issue number5
DOIs
StatePublished - Apr 1 2007

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Mitogen-Activated Protein Kinase Kinases
Transcription Factor AP-1
Transforming Growth Factors
Fibroblast Growth Factor 2
Glioma
Astrocytes
Protein Isoforms
Fibroblast Growth Factor 1
Brain Neoplasms
Neuroglia
Cell Biology
Intercellular Signaling Peptides and Proteins
Phosphorylation
Cell Proliferation
Messenger RNA
Genes

Keywords

  • AP-1
  • Astrocyte
  • Glioma
  • TGF-β1
  • bFGF

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

Cite this

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title = "Induction of transforming growth factor-β1 by basic fibroblast growth factor in rat C6 glioma cells and astrocytes is mediated by MEK/ERK signaling and AP-1 activation",
abstract = "Basic fibroblast growth factor (bFGF) and transforming growth factor-β1 (TGF-β1) play an important role in proliferation, differentiation, and survival of malignant gliomas and in normal glial cell biology. Because of these critical roles, potential interactions between these key growth factors were investigated. We previously demonstrated that bFGF potently stimulates TGF-β1 release from rat glioma cells. The purpose of the present study was to elucidate the mechanism(s) of this regulatory effect, establish its functional importance, and examine whether it extends to nontransformed rat hypothalamic astrocytes (RHA). The results revealed that RHA express the high-affinity FGF(1-4) receptors, and similarly to glioma cells, bFGF stimulated TGF-β1 release in an isoform-specific manner. A mediatory role for ERK signaling in bFGF-induced TGF-β release was suggested by the fact that MEK1 inhibition prevented this effect. Additionally, bFGF enhanced MEK1/2 phosphorylation and ERK activation/nuclear translocation, which culminated in increased activity of AP-1-mediated gene transcription. bFGF markedly induced TGF-β1 mRNA levels in an isoform-specific manner, an effect that was dependent on MEK/ERK/AP-1 signaling. Functionally, bFGF-induced proliferation of glioma cells was attenuated by MEK/ERK inhibition or immunoneutralization of TGF-β1, suggesting that this pathway may have important implications for brain tumor progression.",
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author = "Dhandapani, {Krishnan Michael} and Khan, {Mohammad M.} and Wade, {F. Marlene} and Wakade, {Chandramohan G.} and Mahesh, {Virendra B.} and Brann, {Darrell W}",
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T1 - Induction of transforming growth factor-β1 by basic fibroblast growth factor in rat C6 glioma cells and astrocytes is mediated by MEK/ERK signaling and AP-1 activation

AU - Dhandapani, Krishnan Michael

AU - Khan, Mohammad M.

AU - Wade, F. Marlene

AU - Wakade, Chandramohan G.

AU - Mahesh, Virendra B.

AU - Brann, Darrell W

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N2 - Basic fibroblast growth factor (bFGF) and transforming growth factor-β1 (TGF-β1) play an important role in proliferation, differentiation, and survival of malignant gliomas and in normal glial cell biology. Because of these critical roles, potential interactions between these key growth factors were investigated. We previously demonstrated that bFGF potently stimulates TGF-β1 release from rat glioma cells. The purpose of the present study was to elucidate the mechanism(s) of this regulatory effect, establish its functional importance, and examine whether it extends to nontransformed rat hypothalamic astrocytes (RHA). The results revealed that RHA express the high-affinity FGF(1-4) receptors, and similarly to glioma cells, bFGF stimulated TGF-β1 release in an isoform-specific manner. A mediatory role for ERK signaling in bFGF-induced TGF-β release was suggested by the fact that MEK1 inhibition prevented this effect. Additionally, bFGF enhanced MEK1/2 phosphorylation and ERK activation/nuclear translocation, which culminated in increased activity of AP-1-mediated gene transcription. bFGF markedly induced TGF-β1 mRNA levels in an isoform-specific manner, an effect that was dependent on MEK/ERK/AP-1 signaling. Functionally, bFGF-induced proliferation of glioma cells was attenuated by MEK/ERK inhibition or immunoneutralization of TGF-β1, suggesting that this pathway may have important implications for brain tumor progression.

AB - Basic fibroblast growth factor (bFGF) and transforming growth factor-β1 (TGF-β1) play an important role in proliferation, differentiation, and survival of malignant gliomas and in normal glial cell biology. Because of these critical roles, potential interactions between these key growth factors were investigated. We previously demonstrated that bFGF potently stimulates TGF-β1 release from rat glioma cells. The purpose of the present study was to elucidate the mechanism(s) of this regulatory effect, establish its functional importance, and examine whether it extends to nontransformed rat hypothalamic astrocytes (RHA). The results revealed that RHA express the high-affinity FGF(1-4) receptors, and similarly to glioma cells, bFGF stimulated TGF-β1 release in an isoform-specific manner. A mediatory role for ERK signaling in bFGF-induced TGF-β release was suggested by the fact that MEK1 inhibition prevented this effect. Additionally, bFGF enhanced MEK1/2 phosphorylation and ERK activation/nuclear translocation, which culminated in increased activity of AP-1-mediated gene transcription. bFGF markedly induced TGF-β1 mRNA levels in an isoform-specific manner, an effect that was dependent on MEK/ERK/AP-1 signaling. Functionally, bFGF-induced proliferation of glioma cells was attenuated by MEK/ERK inhibition or immunoneutralization of TGF-β1, suggesting that this pathway may have important implications for brain tumor progression.

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