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• W4361827080 abstract "<div>Abstract<p>Succinate dehydrogenase is a key enzyme in the tricarboxylic acid cycle and the electron transport chain. All four subunits of succinate dehydrogenase are tumor suppressor genes predisposing to paraganglioma, but only mutations in the SDHB subunit are associated with increased risk of metastasis. Here we generated an <i>Sdhd</i> knockout chromaffin cell line and compared it with <i>Sdhb-</i>deficient cells. Both cell types exhibited similar SDH loss of function, metabolic adaptation, and succinate accumulation. In contrast, <i>Sdhb^−/−</i> cells showed hallmarks of mesenchymal transition associated with increased DNA hypermethylation and a stronger pseudo-hypoxic phenotype compared with <i>Sdhd^−/−</i> cells. Loss of SDHB specifically led to increased oxidative stress associated with dysregulated iron and copper homeostasis in the absence of NRF2 activation. High-dose ascorbate exacerbated the increase in mitochondrial reactive oxygen species, leading to cell death in <i>Sdhb^−/−</i> cells. These data establish a mechanism linking oxidative stress to iron homeostasis that specifically occurs in <i>Sdhb</i>-deficient cells and may promote metastasis. They also highlight high-dose ascorbate as a promising therapeutic strategy for SDHB-related cancers.</p>Significance:<p>Loss of different succinate dehydrogenase subunits can lead to different cell and tumor phenotypes, linking stronger 2-OG–dependent dioxygenases inhibition, iron overload, and ROS accumulation following SDHB mutation.</p></div>" @default.
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• W4361827080 date "2023-03-31" @default.
• W4361827080 modified "2023-09-27" @default.
• W4361827080 title "Data from Loss of SDHB Promotes Dysregulated Iron Homeostasis, Oxidative Stress, and Sensitivity to Ascorbate" @default.
• W4361827080 doi "https://doi.org/10.1158/0008-5472.c.6513153.v1" @default.
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