2026-06-30T04:06:46Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/262312025-12-18T12:56:03Zcom_20.500.12105_2327com_20.500.12105_2290col_20.500.12105_16991

00925njm 22002777a 4500 dc Linder, Samantha J author Bernasocchi, Tiziano author Martínez-Pastor, Bárbara author Sullivan, Kelly D author Galbraith, Matthew D author Lewis, Caroline A author Ferrer, Christina M author Boon, Ruben author Silveira, Giorgia G author Cho, Hyo Min author Vidoudez, Charles author Shroff, Stuti author Oliveira-Costa, Joao P author Ross, Kenneth N author Massri, Rami author Matoba, Yusuke author Kim, Eugene author Rueda, Bo R author Stott, Shannon L author Gottlieb, Eyal author Espinosa, Joaquin M author Mostoslavsky, Raul author 2023-12 Glutamine is a critical metabolite for rapidly proliferating cells as it is used for the synthesis of key metabolites necessary for cell growth and proliferation. Glutamine metabolism has been proposed as a therapeutic target in cancer and several chemical inhibitors are in development or in clinical trials. How cells subsist when glutamine is limiting is poorly understood. Here, using an unbiased screen, we identify ALDH18A1, which encodes P5CS, the rate-limiting enzyme in the proline biosynthetic pathway, as a gene that cells can downregulate in response to glutamine starvation. Notably, P5CS downregulation promotes de novo glutamine synthesis, highlighting a previously unrecognized metabolic plasticity of cancer cells. The glutamate conserved from reducing proline synthesis allows cells to produce the key metabolites necessary for cell survival and proliferation under glutamine-restricted conditions. Our findings reveal an adaptive pathway that cancer cells acquire under nutrient stress, identifying proline biosynthesis as a previously unrecognized major consumer of glutamate, a pathway that could be exploited for developing effective metabolism-driven anticancer therapies. Nat Metab . 2023 Dec;5(12):2131-2147 Nature Metabolism https://pmc.ncbi.nlm.nih.gov/articles/PMC11639397/pdf/nihms-2034696.pdf 37957387 https://hdl.handle.net/20.500.12105/26231 AMINO-ACID TUMORS SYNTHETASE VULNERABILITY ADAPTATION ASPARAGINE DEFICIENCY APOPTOSIS PLAYS IMAGE Inhibition of the proline metabolism rate-limiting enzyme P5CS allows proliferation of glutamine-restricted cancer cells.