Biological Role and Therapeutic Targeting of TGF-β3 in Glioblastoma.

Abstract:

:Transforming growth factor (TGF)-β contributes to the malignant phenotype of glioblastoma by promoting invasiveness and angiogenesis and creating an immunosuppressive microenvironment. So far, TGF-β1 and TGF-β2 isoforms have been considered to act in a similar fashion without isoform-specific function in glioblastoma. A pathogenic role for TGF-β3 in glioblastoma has not been defined yet. Here, we studied the expression and functional role of endogenous and exogenous TGF-β3 in glioblastoma models. TGF-β3 mRNA is expressed in human and murine long-term glioma cell lines as well as in human glioma-initiating cell cultures with expression levels lower than TGF-β1 or TGF-β2 in most cell lines. Inhibition of TGF-β3 mRNA expression by ISTH2020 or ISTH2023, two different isoform-specific phosphorothioate locked nucleic acid (LNA)-modified antisense oligonucleotide gapmers, blocks downstream SMAD2 and SMAD1/5 phosphorylation in human LN-308 cells, without affecting TGF-β1 or TGF-β2 mRNA expression or protein levels. Moreover, inhibition of TGF-β3 expression reduces invasiveness in vitro Interestingly, depletion of TGF-β3 also attenuates signaling evoked by TGF-β1 or TGF-β2 In orthotopic syngeneic (SMA-560) and xenograft (LN-308) in vivo glioma models, expression of TGF-β3 as well as of the downstream target, plasminogen-activator-inhibitor (PAI)-1, was reduced, while TGF-β1 and TGF-β2 levels were unaffected following systemic treatment with TGF-β3 -specific antisense oligonucleotides. We conclude that TGF-β3 might function as a gatekeeper controlling downstream signaling despite high expression of TGF-β1 and TGF-β2 isoforms. Targeting TGF-β3in vivo may represent a promising strategy interfering with aberrant TGF-β signaling in glioblastoma. Mol Cancer Ther; 16(6); 1177-86. ©2017 AACR.

journal_name

Mol Cancer Ther

authors

Seystahl K,Papachristodoulou A,Burghardt I,Schneider H,Hasenbach K,Janicot M,Roth P,Weller M

doi

10.1158/1535-7163.MCT-16-0465

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

1177-1186

issue

6

eissn

1535-7163

issn

1538-8514

pii

1535-7163.MCT-16-0465

journal_volume

16

pub_type

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