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Respiratory Research
Published in: Respiratory Research 1/2015

Open Access 01-12-2015 | Research

Mitochondrial DNA alteration in obstructive sleep apnea

Authors: Donato Lacedonia, Giovanna E Carpagnano, Elisabetta Crisetti, Grazia Cotugno, Grazia P Palladino, Giulia Patricelli, Roberto Sabato, Maria P Foschino Barbaro

Published in: Respiratory Research | Issue 1/2015

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Abstract

Background

Obstructive Sleep Apnea (OSAS) is a disease associated with the increase of cardiovascular risk and it is characterized by repeated episodes of Intermittent Hypoxia (IH) which inducing oxidative stress and systemic inflammation. Mitochondria are cell organelles involved in the respiratory that have their own DNA (MtDNA). The aim of this study was to investigate if the increase of oxidative stress in OSAS patients can induce also MtDNA alterations.

Methods

46 OSAS patients (age 59.27 ± 11.38; BMI 30.84 ± 3.64; AHI 36.63 ± 24.18) were compared with 36 control subjects (age 54.42 ± 6.63; BMI 29.06 ± 4.7; AHI 3.8 ± 1.10). In blood cells Content of MtDNA and nuclear DNA (nDNA) was measured in OSAS patients by Real Time PCR. The ratio between MtDNA/nDNA was then calculated. Presence of oxidative stress was evaluated by levels of Reactive Oxygen Metabolites (ROMs), measured by diacron reactive oxygen metabolite test (d-ROM test).

Results

MtDNA/nDNA was higher in patients with OSAS than in the control group (150.94 ± 49.14 vs 128.96 ± 45.8; p = 0.04), the levels of ROMs were also higher in OSAS subjects (329.71 ± 70.17 vs 226 ± 36.76; p = 0.04) and they were positively correlated with MtDNA/nDNA (R = 0.5, p < 0.01).

Conclusions

In OSAS patients there is a Mitochondrial DNA damage induced by the increase of oxidative stress. Intermittent hypoxia seems to be the main mechanism which leads to this process.
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Metadata
Title
Mitochondrial DNA alteration in obstructive sleep apnea
Authors
Donato Lacedonia
Giovanna E Carpagnano
Elisabetta Crisetti
Grazia Cotugno
Grazia P Palladino
Giulia Patricelli
Roberto Sabato
Maria P Foschino Barbaro
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2015
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/s12931-015-0205-7

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