A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.

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 carcino...

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Autores principales:	Aleksandrs Nasonovs, Miguel Garcia-Diaz, Daniel F Bogenhagen
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1d66dc4bfabb479694533af623a72a83
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spelling	oai:doaj.org-article:1d66dc4bfabb479694533af623a72a832021-11-25T06:19:24ZA549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.1932-620310.1371/journal.pone.0249047https://doaj.org/article/1d66dc4bfabb479694533af623a72a832021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0249047https://doaj.org/toc/1932-6203Mitochondria 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.Aleksandrs NasonovsMiguel Garcia-DiazDaniel F BogenhagenPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 3, p e0249047 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Aleksandrs Nasonovs Miguel Garcia-Diaz Daniel F Bogenhagen A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.
description	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.
format	article
author	Aleksandrs Nasonovs Miguel Garcia-Diaz Daniel F Bogenhagen
author_facet	Aleksandrs Nasonovs Miguel Garcia-Diaz Daniel F Bogenhagen
author_sort	Aleksandrs Nasonovs
title	A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.
title_short	A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.
title_full	A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.
title_fullStr	A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.
title_full_unstemmed	A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.
title_sort	a549 cells contain enlarged mitochondria with independently functional clustered mtdna nucleoids.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/1d66dc4bfabb479694533af623a72a83
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_version_	1718413849949896704

A549 cells contain enlarged mitochondria with independently functional clustered mtDNA nucleoids.

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