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• W2022941427 abstract "Heme is considered to play an instrumental role in the pathology of hemolysis, trauma, and reperfusion following ischemia. However, data are sparse and experimental models are required. The transport of heme by hemopexin to tissues is a specific, membrane receptor-mediated process. Hemopexin recycles after endocytosis like transferrin. Heme oxygenase-1 (HO-1), transferrin, the transferrin receptor, and ferritin are regulated by heme-hemopexin. Genes that encode proteins important for cellular defenses against oxidative stress, such as the cysteine-rich metallothioneins (MTs), are also activated by hemopexin, as are proteins that regulate cell cycle control including p21WAF1 and the tumor suppressor p53. The hemopexin system is being investigated to establish how intracellular events are affected by signal(s) from the plasma membrane due to hemopexin receptor occupancy and heme transport. A transient oxidative modification of proteins, shown by carbonyl production, takes place. Redox processes at the cell surface, which generate cuprous ions, are involved in the regulation of the MT-1 and HO-1 genes by heme-hemopexin before heme catabolism and intracellular release of iron. The redox-sensitive transcription factors activated by the hemopexin system include c- Jun, RelA/NFkappaB and MTF-1. The specific copper chelator bathocuproine disulfonate prevents carbonyl production, the nuclear translocation of MTF-1, and the induction of MT-1 revealing a novel, pivotal role for copper in the hemopexin system. In addition, surface redox-active copper is the first link shown for the concomitant regulation of HO-1 and MT-1 and is required for the activation of the amino-terminal c-Jun kinase (JNK) by heme-hemopexin." @default.
• W2022941427 created "2016-06-24" @default.
• W2022941427 creator A5082515168 @default.
• W2022941427 date "2000-06-01" @default.
• W2022941427 modified "2023-10-16" @default.
• W2022941427 title "Links Between Cell-Surface Events Involving Redox-Active Copper and Gene Regulation in the Hemopexin Heme Transport System" @default.
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• W2022941427 doi "https://doi.org/10.1089/ars.2000.2.2-157" @default.
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