Fractionated proteomics identifies a protein network mitigating resistance exercise-induced damage in human skeletal muscle.
Level 4 - case-series / case-control
Uncontrolled prospective human repeated-biopsy physiological study
PubMed 42521682 · doi:10.1038/s41467-026-75501-y
What was done
Researchers analyzed human skeletal muscle using repeated biopsies taken during acute, repeated, and interrupted resistance exercise protocols. They applied fractionated proteomics and phosphoproteomic profiling to track dynamic remodeling of sarcomeric cytoskeleton-associated protein networks and signaling pathways involved in muscle adaptation and repair.
What was found
The abstract reports no numerical values, statistical thresholds, or effect sizes. Qualitatively, damaging resistance exercise induced phosphorylation changes and increased sarcomeric cytoskeletal recruitment of a protein network organized around BAG3 (comprising mechanosensory proteins, small heat shock proteins, and a lipid droplet-associated protein). This network cooperated to target strained myofibrillar structures for degradation via chaperone-assisted selective autophagy (CASA).
Why it matters
The study defines a specific BAG3-centered protein degradation and maintenance network that human skeletal muscle uses to manage mechanical strain and clear damaged myofibrillar proteins during resistance training.
Limits
The abstract provides no quantitative data, effect sizes, participant count, or demographic details (such as sex, age, or baseline training status). The specific exercise regimens, time points of biopsy collection, and functional strength outcomes are not described.
Cited by
- supports Exercise stimulates muscle cells to increase antioxidant defenses, clear damaged proteins and dysfunctional mitochondria, and produce heat shock proteins.