Cold Triggers a Hidden Molecular Pathway That Extends Lifespan, Study Finds

Key Points:

• A new study published in Nature reveals that mildly cold temperatures trigger muscle tissue to produce a metabolite called dihydrobiopterin (BH2), which helps maintain protein homeostasis and supports tissue health during aging.
• In experiments with nematode worms, cold exposure increased the enzyme CAT–4 in muscles, boosting BH2 production that is converted into a molecule aiding amino acid synthesis, thereby extending lifespan and reducing harmful protein aggregation.
• The research suggests that the longevity benefits of cold are due to an actively regulated biological pathway rather than just passive metabolic slowing, with muscle cells playing a key role in signaling these effects throughout the body.
• Importantly, artificially increasing CAT–4 levels in worms extended their lifespan even at normal or warm temperatures, indicating potential to mimic cold benefits without lowering body temperature.
• Preliminary experiments in human cells showed BH2 supplementation reduced abnormal protein accumulation and cell death linked to neurodegenerative diseases, hinting at future therapeutic possibilities, though further research is needed before applying these findings to humans.