Title : p53-dependent glutamine usage determines susceptibility to oxidative stress in radioresistant head and neck cancer cells.

Pub. Date : 2021 Jan

PMID : 33137455






7 Functional Relationships(s)
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1 To elucidate the manner in which p53 deals with glucose-deprived, reactive oxygen species (ROS)-prone conditions in this regard, two isogenic cancer subclones (HN3R-A and HN3R-B) bearing distinct p53 mutations as an in vitro model of intratumoral p53 heterogeneity were identified. Reactive Oxygen Species tumor protein p53 Homo sapiens
2 To elucidate the manner in which p53 deals with glucose-deprived, reactive oxygen species (ROS)-prone conditions in this regard, two isogenic cancer subclones (HN3R-A and HN3R-B) bearing distinct p53 mutations as an in vitro model of intratumoral p53 heterogeneity were identified. Reactive Oxygen Species tumor protein p53 Homo sapiens
3 However, in glucose-deprived and ROS-prone conditions, HN3R-B, the subclone with the original p53 increased the utilization of glutamine by GLS2, thereby maintaining redox homeostasis and ATP. Reactive Oxygen Species tumor protein p53 Homo sapiens
4 Conversely, HN3R-A, the p53-deficient radioresistant subclone displayed an impairment in glutamine usage and high susceptibility to metabolic stresses as well as ROS-inducing agents despite the increased ROS scavenging system. Reactive Oxygen Species tumor protein p53 Homo sapiens
5 Conversely, HN3R-A, the p53-deficient radioresistant subclone displayed an impairment in glutamine usage and high susceptibility to metabolic stresses as well as ROS-inducing agents despite the increased ROS scavenging system. Reactive Oxygen Species tumor protein p53 Homo sapiens
6 Collectively, our findings suggest that p53 governs the alternative utilization of metabolic ingredients, such as glucose and glutamine, in ROS-prone conditions. Reactive Oxygen Species tumor protein p53 Homo sapiens
7 Thus, p53 status may be an important biomarker for selecting cancer treatment strategies, including metabolic drugs and ROS-inducing agents, for recurrent cancers after radiotherapy. Reactive Oxygen Species tumor protein p53 Homo sapiens