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Vps30/Atg6/BECN1 at the crossroads between cell metabolism and DNA damage response. | LitMetric
Several cytotoxic agents used in cancer therapy cause DNA damage and replication stress. Understanding the metabolic determinants of the cell response to replication stress-inducing agents could have relevant implications for cancer treatment. In a recent study, we showed that cell survival during replication stress is influenced by the availability of amino acids, as well as by TORC1 and Gcn2-mediated amino acid sensing pathways. Amino acid starvation, or TORC1 inhibition, sensitizes cells to replication stress conditions, whereas Gcn2 ablation promotes cell survival by stimulating protein synthesis. The Vps34-Vps15-Vps30/Atg6/BECN1-Vps38/UVRAG phosphatidylinositol-3-phosphate (PtdIns3P) complex at the endosomes sets the balance between survival and death signals during replication stress and amino acid starvation. The Vps34-Vps15-Vps30/Atg6/BECN1-Vps38/UVRAG axis promotes the degradation of amino acid transporters, thus sensitizing cells to amino acid starvation, while Vps34-Vps15-Vps30/Atg6/BECN1-Vps38/UVRAG inactivation promotes cell survival by enabling synthesis of stress response proteins mediating survival under replication stress conditions. Our study unravels an autophagy-independent mechanism through which Vps34-Vps30/Atg6/BECN1 promotes lethal events during replication stress.
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