The Claim
In mice, the majority of myostatin in skeletal muscle is stored extracellularly near the sarcolemma as pro-myostatin, and this localization indicates that extracellular activation is the primary regulatory step for myostatin signaling in muscle tissue.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In mice, most myostatin protein in muscle is found outside muscle cells, close to the cell membrane, and its activation outside the cell is the main way it controls muscle growth.
See the scientific wording
In mice, the majority of myostatin in skeletal muscle exists as pro-myostatin stored extracellularly near the sarcolemma, not intracellularly, suggesting that extracellular activation is the primary regulatory step for myostatin signaling in muscle tissue.
Myostatin is made inside muscle cells but stays locked in an inactive form outside the cells, right next to the cell surface. A specific enzyme cuts this inactive form to release the active version, which then tells the muscle to stop growing. When this cut is blocked, the muscle keeps growing bigger because the signal to stop growth never turns on.
What the research says
1 studyStudy: Blocking extracellular activation of myostatin as a strategy for treating muscle wasting
Scientists found that blocking myostatin outside muscle cells — not inside them — makes mice grow bigger muscles. This means most of the muscle-growth blocker is stored just outside the cells and gets activated there.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.