American Society of Hirudotherapy

Protease inhibitors in Haementeria leech species

Research article published in Thromb Haemost (1984)

Last Updated: June 18, 2026Reviewed by: ASH Editorial Board
Research article — evidence reviewArticle reference
Evidence: Preclinical (animal)Salivary PharmacologyDrug DevelopmentMurer EH et al. · Thromb Haemost, 1984

Abstract

Inhibitors, of trypsin, plasmin, alpha-chymotrypsin and granulocyte elastase were demonstrated in salivary gland extracts from two species of leeches. Haementeria ghilianii and Haementeria officinalis. Preliminary fractionation of salivary gland extracts from Haementeria ghilianii allowed separation of protease inhibitors from hementin a fibrinogenolytic blood anticoagulant. It was found that the anticoagulant activity resided only in hementin-containing fractions and did not parallel protease inhibitory activity.

Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.

Publication typeJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.
Indexed MeSH termsAnimalsChymotrypsinFibrinolysinLeechesPancreatic ElastaseProtease InhibitorsSalivary GlandsThrombin TimeTrypsin Inhibitors

Summary

Salivary gland extracts of Haementeria ghilianii and H. officinalis contained inhibitors of trypsin, plasmin, alpha-chymotrypsin and granulocyte elastase; fractionation of H. ghilianii separated these from hementin, with anticoagulant activity confined to hementin-containing fractions.

Why This Matters for Hirudotherapy

This study demonstrated the presence of trypsin, plasmin, alpha-chymotrypsin, and granulocyte elastase inhibitors in salivary gland extracts from two Haementeria leech species (H. ghilianii and H. officinalis), and separated these protease inhibitors from hementin, a fibrinogenolytic anticoagulant. The study characterizes additional bioactive components of the leech secretome beyond the well-known anticoagulants, potentially informing understanding of how leech saliva modulates wound healing and inflammation. However, the work is preclinical biochemical characterization using salivary gland extracts only; there are no in-vivo, clinical, or hirudotherapy data, and no functional therapeutic claims are made.

Citation

Reference (Vancouver style)

Murer EH, James HL, Budzynski AZ, Malinconico SM, Gasic GJ. Protease inhibitors in Haementeria leech species. Thromb Haemost. 1984;51(1):24-26. PMID: 6232728

Bibliographic details (authors, volume, pages, DOI) are taken from the PubMed record.

PubMed

Added to ASH library: May 27, 2026 · Site last updated: June 18, 2026

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.