Hypoxia, inflammation and necrosis as determinants of glioblastoma cancer stem cells progression

Marco Papale, Mariachiara Buccarelli, Cristiana Mollinari, Matteo A. Russo, Roberto Pallini, Lucia Ricci-Vitiani, Marco Tafani

Research output: Contribution to journalArticlepeer-review

Abstract

Tumor hypoxic microenvironment causes hypoxia inducible factor 1 alpha (HIF-1ff) activation and necrosis with alarmins release. Importantly, HIF-1ff also controls the expression of alarmin receptors in tumor cells that can bind to and be activated by alarmins. Human tumor tissues possess 1-2% of cancer stem cells (CSCs) residing in hypoxic niches and responsible for the metastatic potential of tumors. Our hypothesis is that hypoxic CSCs express alarmin receptors that can bind alarmins released during necrosis, an event favoring CSCs migration. To investigate this aspect, glioblastoma stem-like cell (GSC) lines were kept under hypoxia to determine the expression of hypoxic markers as well as receptor for advanced glycation end products (RAGE). The presence of necrotic extracts increased migration, invasion and cellular adhesion. Importantly, HIF-1ff inhibition by digoxin or acriflavine prevented the response of GSCs to hypoxia alone or plus necrotic extracts. In vivo, GSCs injected in one brain hemisphere of NOD/SCID mice were induced to migrate to the other one in which a necrotic extract was previously injected. In conclusion, our results show that hypoxia is important not only for GSCs maintenance but also for guiding their response to external necrosis. Inhibition of hypoxic pathway may therefore represent a target for preventing brain invasion by glioblastoma stem cells (GSCs).

Original languageEnglish
Article number2660
JournalInternational Journal of Molecular Sciences
Volume21
Issue number8
DOIs
Publication statusPublished - Apr 2 2020

Keywords

  • Alarmins
  • Cancer stem cells
  • Glioblastoma
  • Hypoxia
  • Molecular rehabilitation

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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