Hirudins and hirudin-like factors in Hirudinidae: implications for function and phylogenetic relationships
Müller C, Haase M, Lemke S, Hildebrandt JP (2016) · Parasitology Research · n=0
Study Profile
- Design
- molecular biology and bioinformatics analysis of hirudin and hirudin-like factor (HLF) gene expression across Hirudo medicinalis, two related Hirudo species, and Hirudinaria manillensis (Animal Physiology and Biochemistry, Ernst Moritz Arndt University, Greifswald, Germany)
- Sample size (n)
- 0
- Intervention
- Verification of HLF expression in multiple leech species and phylogenetic reconstruction of hirudin and HLF gene families using both gene and protein sequence data
- Comparator
- Cross-species and cross-gene-family comparison; no clinical comparator
- Primary endpoint
- Identification of HLF expression in additional Hirudo species and Hirudinaria manillensis; phylogenetic relationship between hirudins and HLFs
- Primary result
- HLFs are expressed not only in Hirudo medicinalis but in two additional Hirudo species and in Hirudinaria manillensis; phylogenetic analyses support a sister-group relationship between hirudins and HLFs; multiple isoforms of HLFs in individual leeches of different genera suggest key but unconfirmed functions in blood-feeding regulation; molecular targets of HLFs remain unknown at time of publication
- Follow-up duration
- not applicable (in silico and protein-level mechanistic study)
- PMID
- 27785600
Key Findings
- Verifies that hirudin-like factors (HLFs) are conserved across multiple Hirudinidae genera, not unique to Hirudo medicinalis
- Phylogenetic analyses support hirudins and HLFs as sister gene families with shared evolutionary origin
- Multiple HLF isoforms within individual leeches suggest functional specialization in blood-feeding biology
- Documents that HLF molecular targets remain unknown - identifies a key gap in leech pharmacology
- Provides a foundational molecular-biology basis for further investigation of HLF therapeutic potential
Limitations
- Mechanistic study only - no clinical outcomes or human pharmacology data
- HLF molecular targets unknown - functional inference limited
- Limited to in silico phylogenetics plus protein-level expression verification
- Does not investigate hirudin/HLF pharmacology in human subjects or animal models
- Phylogenetic conclusions depend on the gene/protein sequences available at time of analysis
Clinical Implications
Müller 2016 is a foundational mechanistic publication that documents the existence and evolutionary conservation of hirudin-like factors (HLFs) across multiple leech genera. For ASH editorial purposes, the trial is essential context for understanding why hirudin is not the only thrombin-relevant factor in leech saliva, and why HLF-targeted research is an important frontier in leech pharmacology. The study is cited as mechanistic background on compound-registry entries for hirudin and related bioactives. It does not provide clinical-outcome data and should not be cited as efficacy evidence.
Related Trials
Medicinal leech therapy in venous congestion of microsurgical flaps: a randomized comparison with heparin pinprick scarification
Merlino G, Carbone S, Servillo G, Marletta DA (2020)
Adjunctive medicinal leech therapy for venous congestion in free flaps: a German multicenter randomized trial
Lehnhardt M, Daigeler A, Behr B, Schmidt SV, Wallner C (2021)
Medicinal leeches and the microsurgeon: a four-year study, clinical series and risk benefit review
Whitaker IS, Josty IC, Hawkins S, Azzopardi E, Naderi N, Graf J, Damaris L, Lineaweaver WC, Kon M (2011)
Medicinal leeches for surgically uncorrectable venous congestion after free flap breast reconstruction
Pannucci CJ, Nelson JA, Chung CU, Fischer JP, Kanchwala SK, Kovach SJ, Serletti JM, Wu LC (2014)