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Figure S1 from Tumor-Derived Pericytes Driven by EGFR Mutations Govern the Vascular and Immune Microenvironment of Gliomas

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posted on 2023-03-31, 04:20 authored by Berta Segura-Collar, María Garranzo-Asensio, Beatriz Herranz, Esther Hernández-SanMiguel, Teresa Cejalvo, Bárbara S. Casas, Ander Matheu, Ángel Pérez-Núñez, Juan Manuel Sepúlveda-Sánchez, Aurelio Hernández-Laín, Verónica Palma, Ricardo Gargini, Pilar Sánchez-Gómez

Association between the levels of angiogenic molecules and the aggressiveness and the genetic alterations of gliomas.

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FONDECYT

Ministerio de Economía y Competitividad and FEDER funds

Asociación Española contra el Cancer

Ministerio de Ciencia

Innovación y Universidades and FEDER funds

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ARTICLE ABSTRACT

The extraordinary plasticity of glioma cells allows them to contribute to different cellular compartments in tumor vessels, reinforcing the vascular architecture. It was recently revealed that targeting glioma-derived pericytes, which represent a big percentage of the mural cell population in aggressive tumors, increases the permeability of the vessels and improves the efficiency of chemotherapy. However, the molecular determinants of this transdifferentiation process have not been elucidated. Here we show that mutations in EGFR stimulate the capacity of glioma cells to function as pericytes in a BMX- (bone marrow and X-linked) and SOX9-dependent manner. Subsequent activation of platelet-derived growth factor receptor beta in the vessel walls of EGFR-mutant gliomas stabilized the vasculature and facilitated the recruitment of immune cells. These changes in the tumor microenvironment conferred a growth advantage to the tumors but also rendered them sensitive to pericyte-targeting molecules such as ibrutinib or sunitinib. In the absence of EGFR mutations, high-grade gliomas were enriched in blood vessels, but showed a highly disrupted blood–brain barrier due to the decreased BMX/SOX9 activation and pericyte coverage, which led to poor oxygenation, necrosis, and hypoxia. Overall, these findings identify EGFR mutations as key regulators of the glioma-to-pericyte transdifferentiation, highlighting the intricate relationship between the tumor cells and their vascular and immune milieu. Our results lay the foundations for a vascular-dependent stratification of gliomas and suggest different therapeutic vulnerabilities determined by the genetic status of EGFR. This study identifies the EGFR-related mechanisms that govern the capacity of glioma cells to transdifferentiate into pericytes, regulating the vascular and immune phenotypes of the tumors.

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