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The benefits of extracorporeal photochemotherapy (ECP; psoralen and UVA exposure of blood mononuclear cells) in graft-versus-host-disease (GVHD) are well-recognized, but the mechanisms of action remain elusive. As the metabolism of l-arginine in immune cells is known to play a role in immune tolerance, we investigated the effect of ECP on arginine metabolism, and the influence of extracellular l -arginine...
Conventional chemotherapies have showed their limits, notably for patients with advanced cancer. New therapeutic strategies must be identified, and the metabolic abnormalities of cancer cells offer such opportunities. Many human cancer cell lines and primary tumors have absolute requirements for methionine, an essential amino acid. In contrast, normal cells are relatively resistant to exogenous methionine...
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