Cell Metabolism 2015 Landmark: Decoding Mitochondrial Retrograde Signaling

Until the landmark 2015 study by Lee and colleagues published in Cell Metabolism (PMID: 25738459), the 12S rRNA gene was assumed not to encode bioactive signaling peptides. The team discovered that open reading frame MOTS-c yields a 16-amino acid hormone that translocates from the mitochondrion to the nucleus during metabolic perturbation.

In animal models, MOTS-c prevented high-fat-diet-induced insulin resistance in skeletal muscle and blocked hepatic lipid accumulation by targeting the folate cycle and suppressing de novo purine synthesis. This biochemical cascade leads to AICAR-independent accumulation of ZMP and subsequent AMPK activation. Reviewing this original paper provides clear molecular context for why researchers investigate MOTS-c in insulin resistance protocols.