Hypoxia differently modulates the release of mitochondrial and nuclear DNA.
Br J Cancer
; 122(5): 715-725, 2020 03.
Article
en En
| MEDLINE
| ID: mdl-31929518
BACKGROUND: We investigated the influence of hypoxia on the concentration of mitochondrial and nuclear cell-free DNA (McfDNA and NcfDNA, respectively). METHOD: By an ultra-sensitive quantitative PCR-based assay, McfDNA and NcfDNA were measured in the supernatants of different colorectal cell lines, and in the plasma of C57/Bl6 mice engrafted with TC1 tumour cells, in normoxic or hypoxic conditions. RESULTS: Our data when setting cell culture conditions highlighted the higher stability of McfDNA as compared to NcfDNA and revealed that cancer cells released amounts of nuclear DNA equivalent to the mass of a chromosome over a 6-h duration of incubation. In cell model, hypoxia induced a great increase in NcfDNA and McfDNA concentrations within the first 24 h. After this period, cfDNA total concentrations remained stable in hypoxia consecutive to a decrease of nuclear DNA release, and noteworthy, to a complete inhibition of daily mitochondrial DNA release. In TC1-engrafted mice submitted to intermittent hypoxia, plasma NcfDNA levels are much higher than in mice bred in normoxia, unlike plasma McfDNA concentration that is not impacted by hypoxia. CONCLUSION: This study suggests that hypoxia negatively modulates nuclear and, particularly, mitochondrial DNA releases in long-term hypoxia, and revealed that the underlying mechanisms are differently regulated.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
ADN Mitocondrial
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Neoplasias Colorrectales
/
Hipoxia Tumoral
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ADN Tumoral Circulante
Límite:
Animals
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Humans
/
Male
Idioma:
En
Revista:
Br J Cancer
Año:
2020
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Reino Unido