I have posted about the hypermetabolic übermice before.
I'm trying to understand the mechanism. From what I can tell increasing PEPCK-C in the muscle, mainly inhibits anaerobic glycolisis (fermentation metabolism) and increases OxPhos. I think that is the fundamental mechanism. The fact that tjsr doubles life span and increases reproductive health so much, corroborates what Peat said for decades.
"...we identified a progressive decrease in cytosolic phosphoenolpyruvate carboxykinase (PEPCK-C), a longevity-associated metabolic enzyme, and a reciprocal increase in glycolytic pyruvate kinase (PK) that were necessary and sufficient to limit lifespan. Decline in PEPCK-C with age also led to loss of cellular function and integrity including muscle activity, and cellular senescence. Genetic and pharmacologic interventions of PEPCK-C, muscle activity, and AMPK signaling demonstrate that declines in PEPCK-C and muscle function with age interacted to limit reproductive life and lifespan via disrupted energy homeostasis. Quantifications of metabolic flux show that reciprocal changes in PEPCK-C and PK with age shunted energy metabolism toward glycolysis, reducing mitochondrial bioenergetics. Last, calorie restriction countered changes in PEPCK-C and PK with age to elicit anti-aging effects via TOR inhibition. Thus, a programmed metabolic event involving PEPCK-C and PK is a determinant of aging that can be modified to modulate aging."
https://pubmed.ncbi.nlm.nih.gov/26631730/
"...overexpression of the central gluconeogenic gene pck-2 (encoding PEPCK) increases health measures via a mechanism that requires DAF-16 to promote pck-2 expression in specific intestinal cells. Dietary restriction also features DAF-16-dependent pck-2 expression in the intestine, and the healthspan benefits conferred by dietary restriction require pck-2. Together, our results a new paradigm in which nutritional signals engage gluconeogenesis to influence aging quality via DAF-16."
https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1008982
"Finally, a synergistic induction of PEPCK gene transcription by T3 and cAMP is described. "
https://pubmed.ncbi.nlm.nih.gov/1657985/