Circadian Clock Regulates Muscle Stem Cell Regeneration Through Coordinated Notch and Wnt Signaling
Researchers found that the circadian clock controls the timing of muscle stem cell regeneration by coordinating Notch and Wnt signaling pathways in a specific temporal sequence. The study identified circadian clock components as direct regulators of these pathways and showed that activating the clock enhanced muscle repair in both normal and dystrophic muscle. These findings suggest circadian clock activation could be a therapeutic target for improving muscle regeneration after injury or in muscular dystrophy.
A new study published on bioRxiv demonstrates that the circadian clock acts as a master temporal regulator of muscle stem cell regeneration by orchestrating the sequential activation of Notch and Wnt signaling pathways. Researchers identified key Notch pathway components as direct circadian clock targets and showed that genetic or pharmacological clock activation enhanced both the proliferative expansion and differentiation of myogenic progenitor cells during regeneration. Notably, these clock-dependent mechanisms remained functional in both dystrophin-deficient mouse muscle and human myoblasts, suggesting broad applicability. The study found that clock activation improved regenerative outcomes following acute muscle injury and enhanced regeneration in dystrophic muscle models. These findings establish a mechanistic link between circadian biology and regenerative capacity, opening potential avenues for therapeutic interventions targeting the circadian clock to improve muscle repair.
Limitations & open questions
The preprint does not specify the timeline for potential clinical translation of clock-activating compounds, the specific pharmacological agents tested, or whether circadian disruption impairs regeneration—a key validation that would strengthen the causal claims. Additionally, the study's applicability to human patients with muscular dystrophy remains to be determined through clinical trials.
What different sources said
- bioRxivCenter
Circadian Clock Control of Muscle Stem Cells Through Temporal Coordination of Notch and Wnt Signaling
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