American Association for Cancer Research
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FigureS3 from MTAP Deficiency–Induced Metabolic Reprogramming Creates a Vulnerability to Cotargeting De Novo Purine Synthesis and Glycolysis in Pancreatic Cancer

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posted on 2023-03-31, 04:26 authored by Qiangsheng Hu, Yi Qin, Shunrong Ji, Xiuhui Shi, Weixing Dai, Guixiong Fan, Shuo Li, Wenyan Xu, Wensheng Liu, Mengqi Liu, Zheng Zhang, Zeng Ye, Zhijun Zhou, Jingxuan Yang, Qifeng Zhuo, Xianjun Yu, Min Li, Xiaowu Xu

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Funding

Scientific Innovation Project of Shanghai Education Committee

National Science Foundation for Distinguished Young Scholars of China

National Natural Science Foundation of China

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ARTICLE ABSTRACT

Methylthioadenosine phosphorylase (MTAP) is a key enzyme associated with the salvage of methionine and adenine that is deficient in 20% to 30% of pancreatic cancer. Our previous study revealed that MTAP deficiency indicates a poor prognosis for patients with pancreatic ductal adenocarcinoma (PDAC). In this study, bioinformatics analysis of The Cancer Genome Atlas (TCGA) data indicated that PDACs with MTAP deficiency display a signature of elevated glycolysis. Metabolomics studies showed that that MTAP deletion–mediated metabolic reprogramming enhanced glycolysis and de novo purine synthesis in pancreatic cancer cells. Western blot analysis revealed that MTAP knockout stabilized hypoxia-inducible factor 1α (HIF1α) protein via posttranslational phosphorylation. RIO kinase 1 (RIOK1), a downstream kinase upregulated in MTAP-deficient cells, interacted with and phosphorylated HIF1α to regulate its stability. In vitro experiments demonstrated that the glycolysis inhibitor 2-deoxy-d-glucose (2-DG) and the de novo purine synthesis inhibitor l-alanosine synergized to kill MTAP-deficient pancreatic cancer cells. Collectively, these results reveal that MTAP deficiency drives pancreatic cancer progression by inducing metabolic reprogramming, providing a novel target and therapeutic strategy for treating MTAP-deficient disease. This study demonstrates that MTAP status impacts glucose and purine metabolism, thus identifying multiple novel treatment options against MTAP-deficient pancreatic cancer.

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