Life without blood: Molecular and functional analysis of hirudins and hirudin-like factors of the Asian non-hematophagous leech Whitmania pigra
Müller C, Wang Z, Hamann M, Sponholz D, Hildebrandt JP (2022) · Journal of Thrombosis and Haemostasis · n=0
Study Profile
- Design
- molecular identification, cloning, recombinant expression in E. coli, and functional thrombin-inhibition assays of putative hirudin sequences from Whitmania pigra transcriptome data; cross-checked with Hirudo nipponia transcriptomes (University of Greifswald, Germany)
- Sample size (n)
- 0
- Intervention
- Recombinant Whitmania pigra hirudin-family protein expression and functional characterization
- Comparator
- Hematophagous Hirudo species hirudins (reference activity)
- Primary endpoint
- Demonstration of functional thrombin-inhibitory hirudins in a non-hematophagous leech species
- Primary result
- First identification and functional characterization of multiple hirudin-encoding sequences in Whitmania pigra; some recombinant proteins demonstrated thrombin-inhibitory activity, others were hirudin-like factors (HLFs) with weak or absent thrombin inhibition; exon/intron gene structures elucidated; some W. pigra hirudin coding sequences also detected in Hirudo nipponia transcriptomes
- Follow-up duration
- Not applicable
- PMID
- 35587545
Key Findings
- First demonstration of functional hirudins in a non-hematophagous leech
- Whitmania pigra expresses both true hirudins (thrombin inhibitors) and hirudin-like factors (weak/no thrombin inhibition)
- Some W. pigra hirudin coding sequences shared with Hirudo nipponia
- Exon/intron gene structure resolved
- Challenges traditional view that anti-coagulant pharmacology requires hematophagous evolution
Limitations
- Recombinant proteins from E. coli may differ from native molecules
- No in-vivo or mammalian pharmacokinetic data
- Limited population sampling
- No quantitative comparison to H. medicinalis hirudin potency on standardized assay
- W. pigra is not the K040187 device leech
Clinical Implications
Müller 2022 fundamentally expanded the understanding of leech hirudin pharmacology by showing that even non-hematophagous Whitmania pigra harbors functional thrombin inhibitors. For ASH, the paper supports the broader narrative that leech pharmacology is species-diverse — important context for explaining to regulators, clinicians, and researchers why Chinese-medicine Whitmania pigra use does not directly translate to K040187 US clinical practice. Pure scientific relevance only.
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