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Updated: Jul 2, 2025

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Acute Resistance Exercise Modifies Extracellular Vesicle miRNAs Targeting Anabolic Gene Pathways: A Prospective

William R Conkright1, Chris K Kargl1, Monica J Hubal2

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Resistance exercise significantly alters extracellular vesicle (EV) microRNAs (miRNAs), impacting pathways crucial for growth, metabolism, and immune function. These findings highlight EVs as key signaling molecules in exercise adaptation.

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Area of Science:

  • Exercise physiology
  • Molecular biology
  • Biomarker discovery

Background:

  • Resistance training offers health benefits mediated by circulating factors.
  • Extracellular vesicles (EVs) are emerging signaling biomarkers that transport cargo like microRNA (miRNA) to support exercise adaptations.
  • Limited research exists on resistance exercise's impact on EV cargo compared to aerobic exercise.

Purpose of the Study:

  • To investigate the effect of acute resistance exercise on circulating EV miRNAs.
  • To identify predicted target pathways of these altered miRNAs.

Main Methods:

  • Ten participants underwent an acute heavy resistance exercise test (AHRET).
  • EVs were isolated from plasma pre- and post-AHRET using size exclusion chromatography.
  • RNA sequencing and Ingenuity Pathway Analysis were used to identify differentially expressed miRNAs and their target pathways.

Main Results:

  • Acute resistance exercise altered 34 miRNAs (P < 0.05), targeting 4895 mRNAs.
  • 175 canonical pathways were enriched (P < 0.01).
  • Key pathways included those related to growth/metabolism (e.g., mTOR, PI3K/AKT) and inflammation signaling (e.g., TGF-β, IL-6).

Conclusions:

  • Acute resistance exercise modifies EV miRNAs involved in growth, metabolism, and immune function.
  • Circulating EVs are significant adaptive signaling molecules influenced by exercise training.