A Glial Signature and Wnt7 Signaling Regulate Glioma-Vascular Interactions and Tumor Microenvironment

Authors

Document Type

Article

Abstract

Gliomas comprise heterogeneous malignant glial and stromal cells. While blood vessel co-option is a potential mechanism to escape anti-angiogenic therapy, the relevance of glial phenotype in this process is unclear. We show that Olig2 oligodendrocyte precursor-like glioma cells invade by single-cell vessel co-option and preserve the blood-brain barrier (BBB). Conversely, Olig2-negative glioma cells form dense perivascular collections and promote angiogenesis and BBB breakdown, leading to innate immune cell activation. Experimentally, Olig2 promotes Wnt7b expression, a finding that correlates in human glioma profiling. Targeted Wnt7a/7b deletion or pharmacologic Wnt inhibition blocks Olig2 glioma single-cell vessel co-option and enhances responses to temozolomide. Finally, Olig2 and Wnt7 become upregulated after anti-VEGF treatment in preclinical models and patients. Thus, glial-encoded pathways regulate distinct glioma-vascular microenvironmental interactions.

Keywords

Olig2, Wnt, angiogenesis, astrocyte, blood-brain barrier, glioma, invasiveness, oligodendrocyte precursor, p53, vessel co-option

Medical Subject Headings

Animals; Bevacizumab (pharmacology); Blood-Brain Barrier (metabolism); Brain Neoplasms (blood supply, drug therapy, metabolism); Cell Line, Tumor; Gene Expression Regulation, Neoplastic (drug effects); Glioma (blood supply, drug therapy, metabolism); Humans; Mice; Neoplasm Transplantation; Oligodendrocyte Transcription Factor 2 (genetics, metabolism); Oligodendroglia (microbiology); Temozolomide (pharmacology); Tumor Cells, Cultured; Tumor Microenvironment; Wnt Proteins (genetics, metabolism); Wnt Signaling Pathway (drug effects)

Publication Date

5-14-2018

Publication Title

Cancer cell

E-ISSN

1878-3686

Volume

33

Issue

5

First Page

874

Last Page

889.e7

PubMed ID

29681511

Digital Object Identifier (DOI)

10.1016/j.ccell.2018.03.020

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