Changes in circulating microRNAs following head impacts in soccer

Area of Science:

• Neuroscience
• Biochemistry
• Sports Medicine

Background:

• Repetitive head impacts in soccer can lead to neurological issues.
• MicroRNAs (miRNAs) are small molecules that regulate gene expression and may serve as biomarkers for brain injury.
• Understanding the specific effects of head impacts versus exercise is crucial.

Purpose of the Study:

• To investigate the short-term effects of accidental head impacts and repetitive headers on circulating microRNAs in soccer players.
• To differentiate the miRNA changes caused by head impacts from those induced by high-intensity exercise alone.

Main Methods:

• Blood samples were collected from professional soccer players at rest, 1 hour, and 12 hours post-exposure.
• Exposures included accidental head impacts, repetitive headers during training, and high-intensity exercise.
• MicroRNA screening and validation were performed, followed by bioinformatics analysis of target genes and pathways.

Main Results:

• Accidental head impacts deregulated eight miRNAs linked to chromatin organization and Hedgehog/Wnt signaling pathways.
• Repetitive headers deregulated six miRNAs linked to the TGF-β signaling pathway.
• High-intensity exercise alone deregulated seven miRNAs involved in 31 different signaling pathways.

Conclusions:

• Specific microRNAs were identified that are deregulated by accidental head impacts and repetitive headers in soccer.
• These identified microRNAs show potential as biomarkers for detecting brain injuries in athletes.