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Human hookworm infection is a major cause of gastrointestinal blood loss and iron deficiency anemia, affecting up to one billion people in the developing world. These soil-transmitted helminths cause blood loss during attachment to the intestinal mucosa by lacerating capillaries and ingesting extravasated blood. We have isolated the major anticoagulant used by adult worms to facilitate feeding and exacerbate intestinal blood loss. This 8.7-kDa peptide, named the Ancylostoma caninum anticoagulant peptide (AcAP), was purified by using a combination of ion-exchange chromatography, gel-filtration chromatography, and reverse-phase HPLC. N-terminal sequencing of AcAP reveals no homology to any previously identified anticoagulant or protease inhibitor. Single-stage chromogenic assays reveal that AcAP is a highly potent and specific inhibitor of human coagulation, with an intrinsic K*i for the inhibition of free factor Xa of 323.5 pM. In plasma-based clotting time assays, AcAP was more effective at prolonging the prothrombin time than both recombinant hirudin and tick anticoagulant peptide. These data suggest that AcAP, a specific inhibitor of factor Xa, is one of the most potent naturally occurring anticoagulants described to date.

Ancylostoma caninum anticoagulant peptide: a hookworm-derived inhibitor of human coagulation factor Xa.