Hormonal
Inhibition of HIF1α signaling allows regenerating skeletal muscle myofibers to bypass a neonatal maturation checkpoint, thereby accelerating muscle repair and growth following injury.
This research identifies a biological 'brake' on muscle repair: if HIF1α signaling stays high after an injury, the muscle gets stuck in an immature, small state. Pharmacologically lowering HIF1α (e.g., with PX-478 in mice) or genetically removing it allows the muscle to mature faster and grow larger. For humans, this suggests that strategies to modulate hypoxia signaling or mitochondrial fusion (Mfn2) might accelerate recovery from severe muscle trauma, though no such therapy is currently available for general use.
Correspondingly, inhibition of HIF1α allowed myofibers to bypass the checkpoint, thereby accelerating the repair process.
Why this rating
Strong evidence from multiple animal models (knockouts, pharmacological inhibition, genetic stabilization) and human patient correlation, though not a human clinical trial.
Source
A mitofusin 2/HIF1α axis sets a maturation checkpoint in regenerating skeletal muscle
Xun Wang et al. · Journal of Clinical Investigation · 2022
DOI 10.1172/jci161638
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