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MUC1 oncoprotein mitigates ER stress via CDA-mediated reprogramming of pyrimidine metabolism by Olou, Appolinaire A.; King, Ryan J.; Yu, Fang; Singh, Pankaj K. is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is MUC1 oncoprotein mitigates ER stress via CDA-mediated reprogramming of pyrimidine metabolism about?

The Mucin 1 (MUC1) protein is overexpressed in various cancers and mediates chemotherapy resistance. However, the mechanism is not fully understood. Given that most chemotherapeutic drugs disrupt ER homeostasis as part of their toxicity, and MUC1 expression is regulated by proteins involved in ER homeostasis, we investigated the link between MUC1 and ER homeostasis. MUC1 knockdown in pancreatic cancer cells enhanced unfolded protein response (UPR) signaling and cell death upon ER stress induction. Transcriptomic analysis revealed alterations in the pyrimidine metabolic pathway and cytidine deaminase (CDA). ChIP and CDA activity assays showed that MUC1 occupied CDA gene promoter upon ER stress induction correlating with increased CDA expression and activity in MUC1-expressing cells as compared with MUC1 knockdown cells. Inhibition of either the CDA or pyrimidine metabolic pathway diminished survival in MUC1-expressing cancer cells upon ER stress induction. Metabolomic analysis demonstrated that MUC1-mediated CDA activity corresponded to deoxycytidine to deoxyuridine metabolic reprogramming upon ER stress induction. The resulting increase in deoxyuridine mitigated ER stress-induced c

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Author

Olou, Appolinaire A.; King, Ryan J.; Yu, Fang; Singh, Pankaj K.

Publisher

Nature Publishing Group; Springer Science and Business Media LLC (ISSN 0950-9232)

Published

2020

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)