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• W3136335079 startingPage "e0249047" @default.
• W3136335079 abstract "Mitochondria are commonly viewed as highly elongated organelles with regularly spaced mtDNA genomes organized as compact nucleoids that generate the local transcripts essential for production of mitochondrial ribosomes and key components of the respiratory chain. In contrast, A549 human lung carcinoma cells frequently contain apparently swollen mitochondria harboring multiple discrete mtDNA nucleoids and RNA processing granules in a contiguous matrix compartment. While this seemingly aberrant mitochondrial morphology is akin to mito-bulbs previously described in cells exposed to a variety of genomic stressors, it occurs in A549 cells under typical culture conditions. We provide a detailed confocal and super-resolution microscopic investigation of the incidence of such mito-bulbs in A549 cells. Most mito-bulbs appear stable, engage in active replication and transcription, and maintain respiration but feature an elevated oxidative environment. High concentrations of glucose and/or L-glutamine in growth media promote a greater incidence of mito-bulbs. Furthermore, we demonstrate that treatment of A549 cells with TGFβ suppresses the formation of mito-bulbs while treatment with a specific TGFβ pathway inhibitor substantially increases incidence. This striking heterogeneity of mitochondrial form and function may play an important role in a variety of diseases involving mitochondrial dysfunction." @default.
• W3136335079 created "2021-03-29" @default.
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• W3136335079 date "2021-03-25" @default.
• W3136335079 modified "2023-10-18" @default.
• W3136335079 title "A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids" @default.
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• W3136335079 doi "https://doi.org/10.1371/journal.pone.0249047" @default.
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