Abstract 4439: Decoding the metabolic symphony TP53 mutation-driven rewiring of cellular metabolism in non-small cell lung carcinoma

Abstract TP53 is a critical regulator of major metabolic pathways. Metabolic reprogramming is one of the "hallmarks of cancer" and drives tumorigenesis. Frequent p53mutations not only eradicate tumour suppressor capacities but also confer various activities that impact the alteration of metabolic pathways now regarded as central for tumour development and progression. We selected three hotspot mutants (R175H, R273H and R249S) and wtp53 to evaluate the effects in the human non-small cell lung carcinoma cell line (NCI-H1299). Differential expressions of p53 mutants were observed in normal and glucose/glutamine starvation. However, WTp53 expression was not found to be affected. Under both the glucose and glutamine starvation, inhibition of the cell growth and migratory potential of mutant cells was observed which was more prominent in glutamine starvation. Basal respiration and ATP production in p53-/- R273H and R249S significantly increased under glucose starvation. However, Non-mitochondrial oxygen consumption and maximal respiration were found to be decreased in all the cell lines. Importantly, the cells harbouring mutation R175H increase the glycolysis and TCA cycle. The metabolic intermediates of the urea cycle were found to be increased by nearly fourfold in R273H cells. Indicating increased utilization of the urea cycle instead of the TCA cycle, which has been known to be fueled by glutamine for anaplerosis. This study demonstrates that mutp53 influences several metabolic processes and has an influence on cancer cell aggression under starvation of main carbon sources (Glucose and Glutamine). In starved conditions, cells with p53 mutations enhance mitochondrial activity and use alternative pathways in non-small cell lung cancer cells. This might provide a foundation for the development of more effective targeted therapeutics/pharmacological approaches toward variants of mutant p53. Citation Format: Jiyauddin Khan, Asad Ur Rehman, Ankit Mathur, Naveen Kumar Bhatrajuc, Anannya Tulid, Divya Rajput, Mohammad Askandar Iqbal, Daman Saluja. Decoding the metabolic symphony TP53 mutation-driven rewiring of cellular metabolism in non-small cell lung carcinoma abstract. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts) ; 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84 (6Suppl): Abstract nr 4439.