Faulty APOB damages multiple systems

This proposed study asks whether liver protein-building errors can cause vessel, muscle, and glucose problems in naturally aging mice. The proposed mediator is apolipoprotein B (APOB), a protein in fat-carrying blood particles. The intervention would improve accuracy in liver cells supplying 25%, 50%, or 75% of APOB secretion. The model predicts improvement at 50% across all three systems, the same effect at 75%, and no functional threshold at 25%. Researchers would then return a plasma particle fraction containing confirmed APOB errors. Dysfunction returning, while a fraction matched for particle number and fats preserves benefit, would support APOB as the common mediator. Hormone pulses, ammonia, or self-reactive immune cells tracking benefit would favor a rival.