Inhibition of induced and spontaneous platelet aggregation by destabilase from medicinal leech
Basic science published in Platelets (2000)
Abstract
Destabilase, endo-epsilon-(gamma-Glu)-Lys isopeptidase from the medicinal leech, inhibits arterial thrombus formation in rats. Inhibition of platelet aggregation was supposed to be one of the main mechanisms of this phenomenon. To elucidate this question highly purified destabilase preparations were used. Aggregation was monitored both by a turbidometric method and by a method based on real-time estimation of mean aggregate size. Spontaneous aggregation of human platelets was completely blocked by destabilase. At 5 microM ADP maximal inhibition was 63%. Aggregation induced by PAF (100 nM) and collagen (0.1 mg/ml) was inhibited in the presence of destabilase by 50 and 65%, respectively. This enzyme does not activate adenylate cyclase but inhibits it. We suggest that destabilase interacts with high-affinity binding sites on the platelet plasma membrane, thus providing an anti-aggregating effect. This idea coincides with the data that destabilase primary structure has high homology with some adhesive proteins.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Resumen
Destabilase completely blocks spontaneous human platelet aggregation and reduces ADP-, PAF-, and collagen-induced aggregation by 50-65%, likely via plasma membrane high-affinity binding sites.
Por qué esto importa para la hirudoterapia
Este estudio investigó la desestabilasa, una isopeptidasa de la sanguijuela medicinal que inhibe la formación de trombos arteriales en ratas, centrándose en sus mecanismos antiplaquetarios utilizando preparaciones altamente purificadas monitorizadas mediante métodos turbidimétricos y de agregación en tiempo real. Los hallazgos son relevantes para comprender el secretoma de la sanguijuela, ya que la desestabilasa bloqueó completamente la agregación plaquetaria humana espontánea e inhibió la agregación inducida por ADP hasta un 63%, la inducida por PAF un 50% y la inducida por colágeno un 65%. Los autores proponen que la desestabilasa interactúa con sitios de unión de alta afinidad en las membranas plasmáticas plaquetarias y destacan su homología estructural con proteínas adhesivas. El estudio abarca tanto hallazgos de trombosis in vivo en ratas como experimentos in vitro con plaquetas humanas, aunque no incluye datos clínicos
Citación
Inhibition of induced and spontaneous platelet aggregation by destabilase from medicinal leech.
Baskova I et al. · Platelets, 2000
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Añadido a la biblioteca ASH: May 27, 2026 · Última actualización del sitio: 18 de junio de 2026