Abstract
Purpose
Obstructive sleep apnea (OSA) is associated with multiple comorbid conditions including cardiovascular diseases and cancer. There is a growing interest in exploring biomarkers to understand the related mechanisms and improve the risk stratification of OSA. Circulating microRNAs (miRNAs) are single noncoding strands of nearly 22 nucleotides that posttranscriptionally regulate target gene expression. Our aim was to identify miRNA profiles associated with OSA.
Methods
We studied 48 male subjects, mostly Caucasian (63%) and overweight, divided by polysomnography into the no OSA control group (n = 6), mild OSA group (n = 12), moderate OSA group (n = 15), and severe OSA group (n = 15). The study groups were matched for age, body mass index (BMI), and body fat composition. miRNA profiles were measured from peripheral whole blood using two steps: (1) microarray analysis comprising more than 2500 miRNAs in a subsample of 12 subjects (three from each group); and (2) validation phase using real-time quantitative polymerase chain reaction (RTqPCR).
Results
The microarray assessment identified 21 differentially expressed miRNAs among the groups. The RT-qPCR assessment showed that miR-1254 and miR-320e presented a gradual increase in expression parallel to OSA severity. Linear regression analysis showed that severe OSA was independently associated with miR-1254 (ß = 68.4; EP = 29.8; p = 0.02) and miR-320e (ß = 76.1; EP = 31.3; p = 0.02).
Conclusion
Severe OSA is independently associated with miRNAs that are involved in heart failure (miR-1254), myocardial ischemia/reperfusion (miR-320e), and cell proliferation in some cancer types (miR-1254 and miR-320e). Future investigations addressing whether these miRs may provide prognostic information in OSA are needed.
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Funding
This study is supported by FAPESP (2012/02953-2).
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Conceptualization: Luciano F. Drager, Edilamar M. Oliveira, Geraldo Lorenzi-Filho, Luiz A. Bortolotto
Methodology: Luciano F. Drager, Edilamar M. Oliveira, Lunara S. Freitas
Formal analysis and investigation: Lunara S. Freitas, André C. Silveira, Franco C. Martins, Valéria C. Hong, Adriana Lebkuchen, Karina H. M. Cardozo, Fernanda M. Bernardes, Luciano F. Drager, Edilamar M. Oliveira
Writing–original draft preparation: Lunara S. Freitas, André C. Silveira, Geraldo Lorenzi-Filho, Edilamar M. Oliveira, Luciano F. Drager
Writing–review and editing: Lunara S. Freitas, André C. Silveira, Geraldo Lorenzi-Filho, Edilamar M. Oliveira, Luciano F. Drager, Luiz A. Bortolotto
Funding acquisition: Edilamar M. Oliveira, Luciano F. Drager, Geraldo Lorenzi-Filho
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This study have been approved by the local Ethics Committee, under number CAAE: 26431314-8.0000.0068, in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
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Informed consent was obtained from all individual participants included in the study.
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Freitas, L.S., Silveira, A.C., Martins, F.C. et al. Severe obstructive sleep apnea is associated with circulating microRNAs related to heart failure, myocardial ischemia, and cancer proliferation. Sleep Breath 24, 1463–1472 (2020). https://doi.org/10.1007/s11325-019-02003-1
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DOI: https://doi.org/10.1007/s11325-019-02003-1