MOTS-c improves intrinsic muscle mitochondrial bioenergetic health and efficiency in a PGC-1α/AMPK-dependent manner.

{ "summary": "Mice with normal muscle function were given MOTS-c, and their muscle mitochondria were measured for energy production and oxidative stress, showing improved efficiency and less damage.", "explanation": "Two strains of genetically modified mice were given MOTS-c, a peptide derived from mitochondrial DNA, to study its effect on muscle mitochondria, the parts of cells that produce energy. The researchers measured how well the mitochondria generated energy, how much reactive oxygen species (harmful molecules) they released, and how much protein damage occurred. They found that MOTS-c improved mitochondrial energy performance and reduced oxidative stress, but these effects depended on two specific proteins, PGC-1α and AMPK, which act as regulators in the cell. The improvements happened without increasing the amount of mitochondrial proteins, suggesting the mitochondria themselves became more efficient rather than more numerous. The paper also reports that in humans, exercise did not change the level of MOTS-c in blood flowing out of the leg, indicating that muscle may not be the source of circulating MOTS-c during exercise."

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