Related Experiment Video
Updated: Jun 16, 2026
A Simple Double Centrifugation Tube Method to Obtain Platelet-rich Plasma from Equine Blood
Published on: August 15, 2025
Horse chestnut extract contracts bovine vessels and affects human platelet aggregation through 5-HT(2A) receptors: an
Emma Felixsson1, Ingrid A-L Persson, Andreas C Eriksson
1Division of Drug Research/Pharmacology, Department of Medical and Health Sciences, Faculty of Health Sciences, Linköping University, SE-581 85 Linköping, Sweden.
Insights
Horse chestnut extract contracts veins and arteries, primarily via 5-HT(2A) receptors. This herbal medicine also reduces human platelet aggregation, suggesting potential therapeutic benefits for vascular conditions.
Area of Science:
- Pharmacology
- Herbal Medicine
- Cardiovascular Research
Background:
- Horse chestnut (Aesculus hippocastanum L) extract is a traditional herbal remedy for chronic venous insufficiency.
- The precise mechanisms underlying its effects on vascular tissues and platelets are not fully elucidated.
Purpose of the Study:
- To investigate the effects and mechanisms of horse chestnut extract on bovine mesenteric vein and artery contraction.
- To assess the impact of horse chestnut extract on human platelet aggregation.
Main Methods:
- Vascular contraction studies using isolated bovine mesenteric veins and arteries.
- Assessment of human platelet aggregation induced by adenosine diphosphate (ADP).
- Pharmacological blockade using receptor antagonists (ketanserin, prazosin, saralasin) and an enzyme inhibitor (indomethacin).
Main Results:
- Horse chestnut extract induced dose-dependent contraction in both veins and arteries, with veins showing higher sensitivity.
- Contraction of vascular tissues was significantly inhibited by ketanserin (a 5-HT(2A) receptor antagonist).
- Horse chestnut extract significantly reduced ADP-induced human platelet aggregation, with an additive effect observed in the presence of ketanserin.
Conclusions:
- Vascular contraction by horse chestnut extract is, in part, mediated by 5-HT(2A) receptors.
- Horse chestnut extract demonstrates anti-platelet aggregation properties.
- Further research is needed to determine the clinical significance, potential side effects, and drug interactions of horse chestnut extract.
Abstract:
Extract from seeds and bark of horse chestnut (Aesculus hippocastanum L) is used as an herbal medicine against chronic venous insufficiency. The effect and mechanism of action on veins, arteries, and platelets are not fully understood. The aim of this study was to investigate the effects and mechanisms of action of horse chestnut on the contraction of bovine mesenteric veins and arteries, and human platelet aggregation. Contraction studies showed that horse chestnut extract dose-dependently contracted both veins and arteries, with the veins being the most sensitive. Contraction of both veins and arteries were significantly inhibited by the 5-HT(2A) receptor antagonist ketanserin. No effect on contraction was seen with the cyclooxygenase inhibitor indomethacin, the alpha(1) receptor antagonist prazosin or the angiotensin AT(1) receptor antagonist saralasin neither in veins nor arteries. ADP-induced human platelet aggregation was significantly reduced by horse chestnut. A further reduction was seen with the extract in the presence of ketanserin. In conclusion, horse chestnut contraction of both veins and arteries is, at least partly, mediated through 5-HT(2A) receptors. Human platelet aggregation is reduced by horse chestnut. The clinical importance of these findings concerning clinical use, possible adverse effects, and drug interactions remains to be investigated.
More Related Videos
07:32Isolating and Using Sections of Bovine Mesenteric Artery and Vein as a Bioassay to Test for Vasoactivity in the Small Intestine
Published on: October 7, 2014
09:13Turbidimetry on Human Washed Platelets: The Effect of the Pannexin1-inhibitor Brilliant Blue FCF on Collagen-induced Aggregation
Published on: April 6, 2017
