Knockout in U251 Glioblastoma Cells Reduces Tumor Sphere Formation by Increasing Oxidative Stress and Suppressing Methionine Dependency.

Fiche publication

Date publication

avril 2022

Journal

Nutrients

Auteurs

Membres identifiés du Cancéropôle Est :
Pr GUEANT Jean-Louis , Dr NAMOUR Bernard , Pr GAUCHOTTE Guillaume , Dr BATTAGLIA-HSU Shyue-Fang

Tous les auteurs :
Quéré M, Alberto JM, Broly F, Hergalant S, Christov C, Gauchotte G, Guéant JL, Namour F, Battaglia-Hsu SF

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/35565854

Résumé

Previously, the in vitro growth of cancer stem cells in the form of tumor spheres from five different brain cancer cell lines was found to be methionine-dependent. As this earlier work indicated that , a folate-dependent mitochondria aldehyde dehydrogenase gene, is upregulated in glioblastoma stem cells, we invalidated this gene using CRISPR-cas 9 technique in this present work. We reported here that this invalidation was effective in U251 glioblastoma cells, and no cas9 off target site could be detected by genome sequencing of the two independent knockout targeting either exon I or exon III. The knockout of gene in U251 cells rendered the growth of the cancer stem cells of U251 methionine independent. In addition, a much higher ROS (reactive oxygen radicals) level can be detected in the knockout cells compared to the wild type cells. Our evidence here linked the excessive ROS level of the knockout cells to reduced total cellular NADPH. Our evidence suggested also that the cause of the slower growth of the knockout turmor sphere may be related to its partial differentiation.