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Modulation of the ATM/autophagy pathway tips the balance between senescence and apoptosis in response to 20A ligand

ABSTRACT: G-quadruplex ligands (G4L) exert their anti-proliferative effect through telomere-dependent and -independent mechanisms, but the inter-relationship between autophagy, cell growth arrest and cell death induced by these ligands remains largely unexplored. 20A is a 2,4,6-triarylpyridine derivative that binds to G4-DNA with fair to excellent selectivity. Here, we demonstrate that this compound impairs cancer cell viability through induction of senescence and apoptotic cell death in a p53-independent manner. In vivo results corroborate those obtained in in vitro, showing that 20A elicits an important tumor growth inhibition in HeLa-xenografted tumor model. The transcriptomic and proteomic analyses reveal the functional enrichment in the growth arrest, DDR and lysosomal pathways upon 20A treatment. More particularly, we find that ATM and autophagy are activated upon 20A treatment. Genetic inhibition of ATM following 20A treatment inhibits both autophagy and senescence and directs cells to apoptosis. Moreover, loss of autophagy by deletion of two essential autophagy genes ATG5 and ATG7 leads to failure of CHK1 activation and increased cell death triggered by 20A. Our results therefore identify ATM as a critical determinant in the balance between senescence and apoptosis and uncover autophagy as one of the key mediators of such regulation. Thus, targeting the ATM/autophagy pathway might be a promising strategy to achieve the maximal therapeutic effect of the 20A G4-ligand.

OTHER RELATED OMICS DATASETS IN: PXD009430

ORGANISM(S): Homo sapiens

PROVIDER: GSE113424 | GEO | 2019/04/17

REPOSITORIES: GEO

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