Mimics of the chordate gut–brain hormone neurotensin in parasitic intestinal hookworms

Hookworms of the family Ancylostomatidae are intestinal parasites that infect hundreds of millions of people worldwide, contributing to malnutrition, anemia, and impaired development. While hookworms are known to secrete immunomodulatory molecules to evade host defenses, it has been unclear whether they also exploit host hormonal signaling. Here, we identify a previously unrecognized family of hookworm peptides, which we term ancylotensins. Ancylotensins share strong sequence similarity with the chordate hormone neurotensin, a key regulator of metabolism, gut–brain communication, and intestinal function. In vitro pharmacological assays, ex vivo gut contractility studies, and cryo-electron microscopy demonstrate that ancylotensins closely replicate both the structural and functional properties of mammalian neurotensin to modulate gut function. Furthermore, ancylotensins do not share common ancestry with chordate neurotensin and instead evolved independently via convergent evolution. These findings reveal the existence of gut peptide mimicry as a mechanism by which intestinal parasites can manipulate host physiology.