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Cysteine metabolic circuitries: druggable targets in cancer

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TLDR
This review will provide a systematic portrayal of the role of cysteine in cancer biology as a source of carbon and sulphur atoms, the pivotal role in different metabolic pathways and the importance of H2S as an energetic substrate and signalling molecule.
Abstract
To enable survival in adverse conditions, cancer cells undergo global metabolic adaptations. The amino acid cysteine actively contributes to cancer metabolic remodelling on three different levels: first, in its free form, in redox control, as a component of the antioxidant glutathione or its involvement in protein s-cysteinylation, a reversible post-translational modification; second, as a substrate for the production of hydrogen sulphide (H2S), which feeds the mitochondrial electron transfer chain and mediates per-sulphidation of ATPase and glycolytic enzymes, thereby stimulating cellular bioenergetics; and, finally, as a carbon source for epigenetic regulation, biomass production and energy production. This review will provide a systematic portrayal of the role of cysteine in cancer biology as a source of carbon and sulphur atoms, the pivotal role of cysteine in different metabolic pathways and the importance of H2S as an energetic substrate and signalling molecule. The different pools of cysteine in the cell and within the body, and their putative use as prognostic cancer markers will be also addressed. Finally, we will discuss the pharmacological means and potential of targeting cysteine metabolism for the treatment of cancer.

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A double-edged sword.

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Physiological roles of hydrogen sulfide in mammalian cells, tissues and organs.

TL;DR: A wide array of significant roles of H2S in the physiological regulation of all organ functions emerges from this review.
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Metabolic Reprogramming in Anticancer Drug Resistance: A Focus on Amino Acids.

TL;DR: Recent evidence highlighting the key role of amino acid (AA) metabolic reprogramming in cancer cells and the supportive microenvironment in driving resistance to anticancer therapies is provided.
References
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Regulation of Ferroptotic Cancer Cell Death by GPX4

TL;DR: Targeted metabolomic profiling and chemoproteomics revealed that GPX4 is an essential regulator of ferroptotic cancer cell death and sensitivity profiling in 177 cancer cell lines revealed that diffuse large B cell lymphomas and renal cell carcinomas are particularly susceptible to GPx4-regulated ferroPTosis.
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Glutathione Metabolism and Its Implications for Health

TL;DR: Animal and human studies demonstrate that adequate protein nutrition is crucial for the maintenance of GSH homeostasis, and compelling evidence shows that GSH synthesis is regulated primarily by gamma-glutamylcysteine synthetase activity, cysteine availability, and GSH feedback inhibition.
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H2S Signals Through Protein S-Sulfhydration

TL;DR: Ex vivo endogenous H2S physiologically modifies cysteine residues in many proteins, including glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and actin, converting Cysteine -SH groups to -SSH groups in a process the authors call S-sulfhydration.
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