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• W2114717600 abstract "Ferritin stores and detoxifies an excess of intracellular iron, and thereby plays an important role in the metabolism of this metal. As unshielded iron promotes oxidative stress, ferritin is crucial in maintaining cellular redox balance and may also modulate cell growth, survival, and apoptosis. The expression of ferritin is controlled by transcriptional and post-transcriptional mechanisms. In light of the well-established transcriptional induction of ferritin by inflammatory signals, we examined how ferritin mRNA translation responds to stress conditions. We first used HT1080 fibrosarcoma cells engineered for coumermycin-inducible expression of PKR, a stress kinase that inhibits protein synthesis in virus-infected cells by phosphorylating eIF2α. In this setting, iron triggered partial ferritin mRNA translation despite a PKR-induced global shutdown in protein synthesis. Moreover, iron-mediated ferritin synthesis was evident in cells infected with an attenuated strain of poliovirus; when eIF4GI was cleaved, eIF2α was phosphorylated, and host protein synthesis was inhibited. Under global inhibition of protein synthesis or specific inhibition of ferritin mRNA translation in cells overexpressing PKR or IRP1, respectively, we demonstrate association of ferritin mRNA with heavy polysomes. Further experiments revealed that the 5' untranslated region (5' UTR) of ferritin mRNA contains a bona fide internal ribosomal entry site (IRES). Our data are consistent with the existence of an alternative, noncanonical mechanism for ferritin mRNA translation, which may primarily operate under stress conditions to protect cells from oxidative stress." @default.
• W2114717600 created "2016-06-24" @default.
• W2114717600 creator A5002284937 @default.
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• W2114717600 date "2012-01-23" @default.
• W2114717600 modified "2023-09-24" @default.
• W2114717600 title "Alternative ferritin mRNA translation via internal initiation" @default.
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• W2114717600 doi "https://doi.org/10.1261/rna.029322.111" @default.
• W2114717600 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3358652" @default.
• W2114717600 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22271759" @default.
• W2114717600 hasPublicationYear "2012" @default.
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