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Recent Advances in Understanding Mechanisms of TGF Beta Signaling and Its Role in Glioma Pathogenesis

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Glioma Signaling

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1202))

Abstract

Transforming growth factor beta (TGF-β) signaling is involved in the regulation of proliferation, differentiation and survival/or apoptosis of many cells, including glioma cells. TGF-β acts via specific receptors activating multiple intracellular pathways resulting in phosphorylation of receptor-regulated Smad2/3 proteins that associate with the common mediator, Smad4. Such complex translocates to the nucleus, binds to DNA and regulates transcription of many genes. Furthermore, TGF-β-activated kinase-1 (TAK1) is a component of TGF-β signaling and activates mitogen-activated protein kinase (MAPK) cascades. Negative regulation of TGF-β/Smad signaling may occur through the inhibitory Smad6/7. While genetic alterations in genes related to TGF-β signaling are relatively rare in gliomas, the altered expression of those genes is a frequent event. The increased expression of TGF-β1–3 correlates with a degree of malignancy of human gliomas. TGF-β may contribute to tumor pathogenesis in many ways: by direct support of tumor growth, by maintaining self-renewal of glioma initiating stem cells and inhibiting anti-tumor immunity. Glioma initiating cells are dedifferentiated cells that retain many stem cell-like properties, play a role in tumor initiation and contribute to its recurrence. TGF-β1,2 stimulate expression of the vascular endothelial growth factor as well as the plasminogen activator inhibitor and some metalloproteinases that are involved in vascular remodeling, angiogenesis and degradation of the extracellular matrix. Inhibitors of TGF-β signaling reduce viability and invasion of gliomas in animal models and show a great promise as novel, potential anti-tumor therapeutics.

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Abbreviations

ADAMTS-1:

metalloproteinase and disintegrin-like domain

Akt:

protein kinase B/Akt kinase

ALKs:

activin-receptor-like kinases

AP-1:

activator protein 1

BMPs:

bone morphogenetic proteins

CTLs:

cytotoxic T lymphocytes;

ECM:

extracellular matrix

EGFR:

epidermal growth factor receptor

ERK1/2:

extracellular signal-regulated kinases 1/2

GDFs:

growth and differentiation factors

Id:

inhibitor of DNA binding

JAK:

Janus kinase

JNK:

c-Jun N-terminal kinases

LAP:

latency-associated peptide

LIF:

leukemia inhibitory factor

LTBP:

latent TGF-β binding protein

MMP:

metalloproteinase

MT1-MMP:

membrane-type 1 matrix metalloproteinase

p38 MAPK:

P38 mitogen-activated protein kinases

R-Smads:

receptor-Smad proteins

SARA:

Smad anchor for receptor activation

STAT:

signal transducer and activator of transcription

TAK1:

TGF-β-activated kinase-1

TGF-β:

transforming growth factor β

TMZ:

temozolomide

TNFα:

tumor necrosis factor α

TRAF:

TNF receptor associated factor

TβRI:

TGF-β type I receptor

TβRII:

TGF-β type II receptor

VEGF:

vascular endothelial growth factor

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Acknowledgments

The work is supported by a National Science Center grant 017/27/B/NZ3/01605 (BK). SC is a recipient of a scholarship from the National Center of Research and Development project WND-POWR.03.02.00-00-I041/16.

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Correspondence to Bozena Kaminska .

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Kaminska, B., Cyranowski, S. (2020). Recent Advances in Understanding Mechanisms of TGF Beta Signaling and Its Role in Glioma Pathogenesis. In: Barańska, J. (eds) Glioma Signaling. Advances in Experimental Medicine and Biology, vol 1202. Springer, Cham. https://doi.org/10.1007/978-3-030-30651-9_9

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