The Claim

Ractopamine exposure in pigs induces a coordinated upregulation of more than 20 genes regulated by activating transcription factor 4 (ATF4), including asparagine synthetase, sestrin-2, and aminoacyl-tRNA synthetases, indicating activation of an integrated stress response pathway in skeletal muscle.

Source: The Beta-adrenergic agonist, Ractopamine, increases skeletal muscle expression of Asparagine Synthetase as part of an integrated stress response gene program

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
19score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

Ractopamine exposure in pigs increases the activity of over 20 genes controlled by ATF4, including asparagine synthetase, sestrin-2, and aminoacyl-tRNA synthetases, in skeletal muscle, which reflects activation of the integrated stress response pathway.

See the scientific wording

Ractopamine exposure in pigs induces a coordinated upregulation of more than 20 genes known to be regulated by activating transcription factor 4 (ATF4), including asparagine synthetase, sestrin-2, and aminoacyl-tRNA synthetases, indicating activation of an integrated stress response pathway in skeletal muscle.

Why this might work

Ractopamine binds to receptors on muscle cells, triggering a chain reaction that turns on a set of stress-response genes. These genes help the cell manage amino acid levels and protein production during metabolic strain, even as the drug pushes the muscle to grow. The cell activates these genes not because it is starving, but because the drug forces it into a state that mimics nutrient shortage.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: The Beta-adrenergic agonist, Ractopamine, increases skeletal muscle expression of Asparagine Synthetase as part of an integrated stress response gene program

    Ractopamine, a drug given to pigs to make them leaner, tricks their muscle cells into thinking they’re under stress — turning on a set of genes that usually activate when cells are low on nutrients. Even though the drug helps muscles grow, it also flips on these stress signals.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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