Fractionated proteomics identifies a protein network mitigating resistance exercise-induced damage in human skeletal muscle
This study reveals molecular responses of untrained, adapted and deadapted human skeletal muscle to resistance exercise, which identifies a network of mechanosensory proteins and molecular chaperones that ensures skeleta
Resistance exercise (RE) is a cornerstone of physical conditioning, improving strength and muscle mass while offering multiple health benefits. However, intense RE also induces acute myofibrillar damage, necessitating robust molecular mechanisms to preserve, mark, degrade, and restore damaged proteins. These mechanisms are essential for maintaining skeletal muscle function under stress but remain incompletely understood.
Based on repeated sampling of human skeletal muscle, researchers demonstrated that acute, repeated, and interrupted RE induce dynamic changes in the protein landscape associated with the sarcomeric cytoskeleton. These alterations correlate with shifts in phosphorylation patterns, indicative of adaptation and deadaptation signaling footprints. The study utilized fractionated proteomics to capture these nuanced molecular responses across different training states.
Regulation primarily affects the protein network linked to the muscle maintenance protein BAG3, which includes mechanosensory proteins, small heat shock proteins, and a lipid droplet-associated protein. All network components exhibit altered phosphorylation and increased cytoskeletal association following damaging RE. This coordinated response suggests a critical role for these proteins in monitoring structural integrity during mechanical stress.
Moreover, network components cooperate to recognize strained skeletal muscle structures and mediate their degradation through chaperone-assisted selective autophagy (CASA). This process ensures the removal of damaged proteins while preserving functional cellular machinery. The authors' study thus identifies key regulators of skeletal muscle homeostasis in humans, providing new insights into exercise-induced adaptation.
This research highlights the importance of mechanosensory and chaperone networks in mitigating resistance exercise-induced damage. Understanding these pathways may inform strategies for optimizing training protocols and managing muscle health. However, further investigation is required to fully elucidate the clinical implications of these findings.
Note: This information is provided for research-use only (RUO) purposes. Peptides and related compounds should be handled according to laboratory safety guidelines and institutional policies.