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Plasma MicroRNA Levels Differ between Endurance and Strength Athletes

Author

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  • Sophie L Wardle
  • Mark E S Bailey
  • Audrius Kilikevicius
  • Dalia Malkova
  • Richard H Wilson
  • Tomas Venckunas
  • Colin N Moran

Abstract

Aim: MicroRNAs (miRNAs) are stable in the circulation and are likely to function in inter-organ communication during a variety of metabolic responses that involve changes in gene expression, including exercise training. However, it is unknown whether differences in circulating-miRNA (c-miRNA) levels are characteristic of training modality. Methods: We investigated whether levels of candidate c-miRNAs differ between elite male athletes of two different training modalities (n = 10 per group) - endurance (END) and strength (STR) - and between these groups and untrained controls (CON; n = 10). Fasted, non-exercised, morning plasma samples were analysed for 14 c-miRNAs (miR-1, miR-16-2, miR-20a-1, miR-21, miR-93, miR-103a, miR-133a, miR-146a, miR-192, miR-206, miR-221, miR-222, miR-451, miR-499). Moreover, we investigated whether c-miRNA levels were associated with quantitative performance-related phenotypes within and between groups. Results: miR-222 was present at different levels in the three participant groups (p = 0.028) with the highest levels being observed in END and the lowest in STR. A number of other c-miRNAs were present at higher levels in END than in STR (relative to STR, ± 1 SEM; miR-222: 1.94 fold (1.73-2.18), p = 0.011; miR-21: 1.56 fold (1.39-1.74), p = 0.013; miR-146a: 1.50 fold (1.38-1.64), p = 0.019; miR-221: 1.51 fold (1.34-1.70), p = 0.026). Regression analyses revealed several associations between candidate c-miRNA levels and strength-related performance measures before and after adjustment for muscle or fat mass, but not following adjustment for group. Conclusion: Certain c-miRNAs (miR-222, miR-21, miR-146a and miR-221) differ between endurance- and resistance-trained athletes and thus have potential as useful biomarkers of exercise training and / or play a role in exercise mode-specific training adaptations. However, levels of these c-miRNAs are probably unrelated to muscle bulk or fat reserves.

Suggested Citation

  • Sophie L Wardle & Mark E S Bailey & Audrius Kilikevicius & Dalia Malkova & Richard H Wilson & Tomas Venckunas & Colin N Moran, 2015. "Plasma MicroRNA Levels Differ between Endurance and Strength Athletes," PLOS ONE, Public Library of Science, vol. 10(4), pages 1-15, April.
  • Handle: RePEc:plo:pone00:0122107
    DOI: 10.1371/journal.pone.0122107
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    1. María Mittelbrunn & Cristina Gutiérrez-Vázquez & Carolina Villarroya-Beltri & Susana González & Fátima Sánchez-Cabo & Manuel Ángel González & Antonio Bernad & Francisco Sánchez-Madrid, 2011. "Unidirectional transfer of microRNA-loaded exosomes from T cells to antigen-presenting cells," Nature Communications, Nature, vol. 2(1), pages 1-10, September.
    2. Tzu-Pin Lu & Chien-Yueh Lee & Mong-Hsun Tsai & Yu-Chiao Chiu & Chuhsing Kate Hsiao & Liang-Chuan Lai & Eric Y Chuang, 2012. "miRSystem: An Integrated System for Characterizing Enriched Functions and Pathways of MicroRNA Targets," PLOS ONE, Public Library of Science, vol. 7(8), pages 1-10, August.
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