Hormonal
Elevated levels of the transcriptional coactivator PGC-1α protect skeletal muscle from atrophy by suppressing the transcriptional activity and binding of the FoxO3 transcription factor to atrophy-related genes (atrogin-1 and MuRF-1).
To maintain muscle mass, especially during periods of stress, illness, or reduced activity, prioritize metabolic health and regular movement. This helps keep PGC-1α levels high, which naturally blocks the molecular signals (FoxO3) that trigger muscle breakdown. While this doesn't replace resistance training for growth, it is a critical defense against muscle loss.
Transfection of PGC-1α into adult fibers reduced the capacity of FoxO3 to cause fiber atrophy and to bind to and transcribe from the atrogin-1 promoter.
Why this rating
Strong evidence from multiple rodent models (transgenic, denervation, fasting, disease cachexia) and molecular assays (ChIP, luciferase), though not human clinical trials.
Source
PGC-1α protects skeletal muscle from atrophy by suppressing FoxO3 action and atrophy-specific gene transcription
Marco Sandri et al. · Proceedings of the National Academy of Sciences · 2006
DOI 10.1073/pnas.0607795103
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