Overview
- Researchers report that para‑tyramine‑O‑sulfate (pTOS) rises about 1,000‑fold in pythons after feeding, according to a Nature Metabolism paper published March 19.
- In obese mice, repeated pTOS dosing reduced food intake and produced roughly 9% weight loss over 28 days without observed gastrointestinal issues, changes in energy expenditure, or muscle loss.
- Experiments indicate that gut bacteria generate pTOS from dietary tyrosine, antibiotic pretreatment abolishes the post‑meal spike in snakes, and the metabolite activates hypothalamic neurons linked to feeding control.
- Analyses of human datasets show low baseline detection with small post‑meal increases in most individuals and a single case with a more than 25‑fold rise approaching python‑level concentrations.
- The study’s investigators have formed Arkana Therapeutics to explore synthetic analogs, with early grant funding reported and translational work remaining at a preclinical stage.