University of Oulu

Karvinen S, Sievänen T, Karppinen JE, Hautasaari P, Bart G, Samoylenko A, Vainio SJ, Ahtiainen JP, Laakkonen EK and Kujala UM (2020) MicroRNAs in Extracellular Vesicles in Sweat Change in Response to Endurance Exercise. Front. Physiol. 11:676. doi: 10.3389/fphys.2020.00676

MicroRNAs in extracellular vesicles in sweat change in response to endurance exercise

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Author: Karvinen, Sira1; Sievänen, Tero1; Karppinen, Jari E.2;
Organizations: 1Gerontology Research Center and Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
2Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
3Laboratory of Developmental Biology, Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Oulu, Finland
4InfoTech Oulu, Borealis Biobank of Northern Finland, University Hospital, Oulu Center for Cell Matrix Research, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.9 MB)
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Language: English
Published: Frontiers Media, 2020
Publish Date: 2020-10-27


Background: To date, microRNAs (miRs) carried in extracellular vesicles (EVs) in response to exercise have been studied in blood but not in non-invasively collectable body fluids. In the present study, we examined whether six exercise–responsive miRs, miRs-21, -26, -126, -146, -221, and -222, respond to acute endurance exercise stimuli of different intensities in sweat.

Methods: We investigated the response of miRs isolated from sweat and serum EVs to three endurance exercise protocols: (1) maximal aerobic capacity (VO2max), (2) anaerobic threshold (AnaT), and (3) aerobic threshold (AerT) tests. Sauna bathing was used as a control test to induce sweating through increased body temperature in the absence of exercise. All protocols were performed by the same subjects (n = 8, three males and five females). The occurrence of different miR carriers in sweat and serum was investigated via EV markers (CD9, CD63, and TSG101), an miR-carrier protein (AGO2), and an HDL-particle marker (APOA1) with Western blot. Correlations between miRs in sweat and serum (post-sample) were examined.

Results: Of the studied miR carrier markers, sweat EV fractions expressed CD63 and, very weakly, APOA1, while the serum EV fraction expressed all the studied markers. In sweat EVs, miR-21 level increased after AerT and miR-26 after all the endurance exercise tests compared with the Sauna (p < 0.050). miR-146 after AnaT correlated to sweat and serum EV samples (r = 0.881, p = 0.004).

Conclusion: Our preliminary study is the first to show that, in addition to serum, sweat EVs carry miRs. Interestingly, we observed that miRs-21 and -26 in sweat EVs respond to endurance exercise of different intensities. Our data further confirmed that miR responses to endurance exercise in sweat and serum were triggered by exercise and not by increased body temperature. Our results highlight that sweat possesses a unique miR carrier content that should be taken into account when planning analyses from sweat as a substitute for serum.

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Series: Frontiers in physiology
ISSN: 1664-042X
ISSN-E: 1664-042X
ISSN-L: 1664-042X
Volume: 11
Article number: 676
DOI: 10.3389/fphys.2020.00676
Type of Publication: A1 Journal article – refereed
Field of Science: 3111 Biomedicine
Funding: This project was funded by Business Finland (grant 5802/31/2016 to UK) and the Academy of Finland (grant 309504 to EL). GB, AS, and SV were supported by Academy of Finland (grant 315030 and 307533 to SV), FET OPEN MindGAP (grant 829040), and the Sigrid Jusélius Foundation (SV).
EU Grant Number: (829040) MindGAP - Bridging the gap between Mind, Brain and Body: exosome role and monitoring
Academy of Finland Grant Number: 315030
Detailed Information: 315030 (Academy of Finland Funding decision)
307533 (Academy of Finland Funding decision)
Copyright information: © 2020 Karvinen, Sievänen, Karppinen, Hautasaari, Bart, Samoylenko, Vainio, Ahtiainen, Laakkonen and Kujala. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.