American Society of Hirudotherapy

Antithrombin III binding protein

Leech-derived inhibitor that potentiates host antithrombin III activity — synergistic anticoagulation.

Preclinical / mechanisticLast updated: 2026-05-26 · Reviewed by ASH Editorial Board
Molecular weight of Antithrombin III binding protein compared with other characterized leech-derived compoundsHementerin80 kDaHementin80 kDaHementin-Like Protein (HLP-1)80 kDaLeech Collagenase70 kDaHaemadipsa yanyuanensis Progr…70 kDaLeech Apyrase67 kDaCalin65 kDaHyaluronidase60 kDaAntithrombin III binding prot…58 kDaCollagenolytic Fibrinolysin55 kDaLeech Thrombospondin-Like Pro…50 kDaLHyal (Leech Hyaluronidase)50 kDa
Molecular weight (kilodaltons) of Antithrombin III binding protein (highlighted) alongside other characterized leech salivary compounds. Smaller proteins/peptides generally diffuse and act faster.

Mechanistic Evidence Box

Preclinical / mechanistic
Page type
Compound profile
Evidence type
Leech-derived inhibitor that potentiates host antithrombin III activity — synergistic anticoagulation.
Evidence level
In vitro
Drug vs leech
Purified natural compound
Safety domains
Bleeding

Clinical translation limit

This leech-derived factor's reported potentiation of antithrombin III does not establish clinical efficacy. No FDA-approved derivative exists. Mechanism is preclinical/biochemical only and rests largely on Russian-language literature.

Molecular Profile

Category
Anticoagulant
Evidence tier
Preclinical
Molecular weight
58,000 Da
Source species
Hirudo medicinalis
Antithrombin III binding protein molecular structure

Biological Targets

  • antithrombin III complex

Key Citations

  1. Baskova IP, Nikonov GI (1985), Biokhimiia

External Resources

    Related Anticoagulant Compounds

    This website provides educational information and does not constitute medical advice, diagnosis, or treatment recommendations. Medicinal leech therapy carries clinically meaningful risks and should be performed only by qualified clinicians under institutionally approved protocols. FDA 510(k) clearance for medicinal leeches is limited to specific indications; investigational and off-label discussions are labeled accordingly. For patient-specific guidance, consult a qualified healthcare provider.