Related Experiment Video
Updated: Jun 14, 2025
11:50
Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle
Published on: June 8, 2022
4.1K
Circulating miRNA Signaling for Fatty Acid Metabolism in Response to a Maximum Endurance Test in Elite Long-Distance
Dailson Paulucio1, Carlos Ramirez-Sanchez1, Rodolfo Velasque1
1Biometrics Laboratory (LADEBIO), Federal University of Rio de Janeiro, Rio de Janeiro 21941-599, Brazil.
Genes
|August 29, 2024
Summary
Epigenetics, specifically microRNAs (miRNAs), influences maximal oxygen uptake (VO2max) in elite athletes. Fatty acid metabolism pathways are significantly targeted by these miRNAs, highlighting their role in endurance performance.
Area of Science:
- Exercise Physiology
- Molecular Biology
- Epigenetics
Background:
- Maximal oxygen uptake (VO2max) is a key indicator of cardiorespiratory fitness in endurance athletes.
- Epigenetic factors, particularly microRNAs (miRNAs), play a significant role in VO2max levels and variability.
- Elite endurance athletes exhibit distinct VO2max levels despite similar training volumes, suggesting underlying genetic and epigenetic influences.
Purpose of the Study:
- To investigate the plasma miRNA profile in elite endurance athletes with varying VO2max levels.
- To identify specific miRNAs and their associated biological pathways influenced by an acute maximal endurance test.
- To explore the relationship between miRNA expression, VO2max, and fatty acid metabolism in trained athletes.
Main Methods:
- Plasma samples were collected from 23 elite endurance athletes before and after a maximal graded exercise test.
- Six athletes were categorized into high (75.4 mL.kg-1.min-1) and low (60.1 mL.kg-1.min-1) VO2max groups.
- RNA was extracted, and a 1113 miRNA RT-qPCR panel was used to analyze differential miRNA expression.
- Bioinformatic analysis (DIANA tools) was performed on significantly expressed miRNAs to identify targeted pathways.
Main Results:
- 51 miRNAs were found to be differentially expressed between the high and low VO2max groups.
- miRNA expression patterns clustered based on performance levels and time points (pre- vs. post-exercise).
- Fatty acid metabolism pathways were significantly targeted by differentially expressed miRNAs across all groups and time points (p < 0.001).
Conclusions:
- Plasma miRNA profiles differ between elite endurance athletes with high and low VO2max.
- Epigenetic regulation via miRNAs, particularly those involved in fatty acid metabolism, contributes to cardiorespiratory capacity.
- These findings suggest a link between genetic/epigenetic factors, fatty acid pathways, and endurance performance in elite athletes.
Related Concept Videos
01:22MicroRNAs
3.0K
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
3.0K
01:24Metabolic States of the Body: Fasting and Starvation
1.2K
During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
1.2K