Prostaglandin E1 is an efficient molecular tool for forest leech blood sucking
Behavioral pharmacology published in Frontiers in Veterinary Science (2021)
Abstract
From a survival perspective, it is hypothesized that leech saliva exhibits certain physiological effects to ensure fast blood-feeding, including analgesia, anesthesia, and anti-inflammation to stay undetected by the host and vasodilatation and anti-hemostasis to ensure a steady, rapid, and sustained blood flow to the feeding site. Many anti-hemostatic compounds have been identified in leech saliva, such as hirudin, calin, and bdellin A. However, no specific substance with direct vasodilatory and anti-inflammatory function has been reported from forest leech saliva. Herein, using activity-guided analysis, prostaglandin E1 (PGE1) was identified for the first time as an efficient molecular tool for forest leech blood sucking. The structure of PGE1 was analyzed by nuclear magnetic resonance spectroscopy and high-resolution electrospray ionization mass spectroscopy. PGE1 was found to be primarily distributed in the leech salivary gland (1228.36 ng/g body weight). We also analyzed how forest leech PGE1 affects platelet aggregation, skin vascular permeability, bleeding time, and pain. Results indicated that PGE1 efficiently inhibited platelet aggregation induced by adenosine diphosphate (ADP) (5 μM) with an IC50 of 21.81 ± 2.24 nM. At doses of 10, 100 nM, and 1 μM, PGE1 increased vascular permeability by 1.18, 5.8, and 9.2 times. It also prolonged bleeding time in a concentration-independent manner. In the formalin-induced mouse paw pain model, PGE1 suppressed acute pain. To the best of our knowledge, this is the first report on PGE1 in invertebrates. The functions of PGE1, such as vasodilation, platelet aggregation inhibition, anti-inflammation, and pain alleviation, may facilitate the ingestion of host blood by leeches.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Resumen
Identifies prostaglandin E1 as an effective stimulant for blood-sucking by forest leeches — useful for laboratory feeding protocols and research.
Por qué esto importa para la hirudoterapia
Este estudio (Zheng et al., Frontiers in Veterinary Science 2021) reporta la primera identificación de prostaglandina E1 (PGE1) en la saliva de sanguijuelas forestales como una herramienta molecular que ayuda a la alimentación sanguínea; la PGE1 estaba concentrada en la glándula salival, inhibió la agregación plaquetaria inducida por ADP (IC50 reportado de 21,81 más o menos 2,24 nM), aumentó la permeabilidad vascular cutánea de forma dependiente de la dosis, prolongó el tiempo de sangrado y suprimió el dolor agudo en un modelo de ratón de formol, con los autores afirmando que este es el primer informe de PGE1 en un invertebrado. Esto amplía el panorama del secretoma de la sanguijuela más allá de péptidos como hirudin, calin y bdellin para incluir un mediador de pequeña molécula que combina acciones vasodilatadoras, antiplaquetarias, antiinflamatorias y analgésicas que explican plausiblemente por qué las mordeduras de sanguijuelas sangran y son relativamente indoloras, reforzando la justificación de descubrimiento de fármacos detrás de la hirudoterapia. Honestamente, una advertencia: estos son hallazgos preclínicos bioquímicos y de modelo animal de una sanguijuela forestal (no necesariamente Hirudo medicinalis), que caracterizan un componente salival en el laboratorio, no un estudio clínico del tratamiento con sanguijuelas en pacientes.
Citación
Prostaglandin E1 is an efficient molecular tool for forest leech blood sucking.
Zheng F et al. · Frontiers in veterinary science, 2021
Contexto clínico relacionado
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Añadido a la biblioteca ASH: May 27, 2026 · Última actualización del sitio: June 18, 2026