American Society of Hirudotherapy

Time to Change Theory; Medical Leech from a Molecular Medicine Perspective: Leech Salivary Proteins Playing a Potential Role in Medicine

Review published in Adv Pharm Bull (2020)

Last Updated: June 18, 2026Reviewed by: ASH Editorial Board
Research article — evidence reviewArticle reference
Evidence: Narrative reviewSalivary PharmacologyDrug DevelopmentClinical TrialsShakouri A et al. · Advanced pharmaceutical bulletin, 2020

Abstract

Followed by developing modern medicine, leeches did not have extensive use as before; however, in the late 19th century, they were still used in most countries all over the world. Thus far, leeches were utilized in treating various diseases like skin disorders, arthritis, and cancer. In Egypt, using leeches for treatment dates back to early 1500 BC. A medical leech's salivary glands involve over 100 bioactive proteins and the salivary gland secretion contains bacteriostatic, analgesic, and anticoagulation influences; with resolving activity, it causes microcirculation disorders elimination, restoring the hurt vascular permeability of organs and tissues, removing hypoxia, decreasing blood pressure and detoxifying the organism by antioxidant paths. The current work reviews the innovative treatment with medical leech, especially proteins in leech saliva extraction (LSE) with high potential in medicine. The virtue of salivary gland secretions which are proteinaceous enzymes, leech acts on various diseases such as venous congestion in reconstructive and plastic surgery, osteoarthritis, cardiovascular diseases caused by blood coagulation disorders, pain management, priapism, macroglossia, cancer complications, wounds and many other. To confirm the potential therapeutic impacts of leech treatment, more studies are required in more extensive areas with more exact methodologies.

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

Publication typeJournal ArticleReview

Summary

Review of medical-leech salivary-gland proteins (over 100 bioactives) including anticoagulants, analgesics, bacteriostatics, and microcirculation modulators. Maps clinical applications across venous congestion, osteoarthritis, cardiovascular disease, pain, priapism, and macroglossia.

Why This Matters for Hirudotherapy

This review explores medicinal leech therapy and leech salivary proteins from a molecular medicine perspective, noting that medical leech salivary glands contain over 100 bioactive proteins with bacteriostatic, analgesic, anticoagulant, resolving, microcirculation-restoring, anti-hypoxic, and antioxidant activities. It discusses applications including venous congestion in reconstructive/plastic surgery, osteoarthritis, cardiovascular disease, pain management, priapism, macroglossia, cancer complications, and wound healing, tracing leech medicinal use back to Egypt circa 1500 BC. For ASH's domain, this is directly relevant: it is a dedicated review of leech salivary proteins and their therapeutic potential, aligning with the core focus of ASH. Caveat: as a review, it presents no new experimental data and the authors explicitly state that more rigorous and extensive studies are needed to confirm therapeutic effects; specific molecular or clinical evidence is not detailed in the abstract.

Citation

Time to Change Theory; Medical Leech from a Molecular Medicine Perspective: Leech Salivary Proteins Playing a Potential Role in Medicine.

Shakouri A et al. · Advanced pharmaceutical bulletin, 2020

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.