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Related Experiment Video

Updated: May 29, 2026

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

Published on: November 11, 2016

Ligustilide: a novel TRPA1 modulator.

Jian Zhong¹, Federica Pollastro, Jean Prenen

¹Department of Cell Biology, Laboratory of Ion Channel Research, Campus Gasthuisberg, KU Leuven, Herestraat 49, bus 802, 3000 Louvain, Belgium.

Pflugers Archiv : European Journal of Physiology

|September 7, 2011

Summary

Ligustilide (Lig) shows dual effects on the TRPA1 ion channel, acting as both an activator and an inhibitor. Its metabolite, dehydroligustilide (DH-Lig), primarily inhibits TRPA1, with a mechanism independent of cysteine alkylation.

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Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

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Published on: November 11, 2016

A Fluorescent Screening Assay for Identifying Modulators of GIRK Channels

A Fluorescent Screening Assay for Identifying Modulators of GIRK Channels

Published on: April 24, 2012

Area of Science:

Molecular Biology
Neuroscience
Pharmacology

Background:

Transient Receptor Potential Ankyrin 1 (TRPA1) is a crucial ion channel activated by electrophilic irritants like mustard oil.
Ligustilide (Lig) is a dietary compound with potential medicinal applications, known to be electrophilic.

Purpose of the Study:

To investigate the bimodal sensitivity of TRPA1 to ligustilide (Lig) and its metabolite, dehydroligustilide (DH-Lig).
To elucidate the interaction mechanisms of Lig and DH-Lig with TRPA1, focusing on the role of reactive cysteines.

Main Methods:

Electrophysiological recordings of TRPA1 channel activity.
Site-directed mutagenesis of reactive cysteine residues (C622S, C642S, C666S) in mouse TRPA1.
Chemical modification and analysis of Lig and DH-Lig.

Main Results:

Ligustilide (Lig) exhibits dual activity, potently activating TRPA1 and modestly inhibiting mustard oil-induced currents.
Dehydroligustilide (DH-Lig) reverses this profile, acting as a TRPA1 inhibitor.
Mutating TRPA1 cysteines significantly reduced activation by mustard oil and Lig, but had minimal impact on DH-Lig-induced activation, suggesting a distinct mechanism.

Conclusions:

The phthalide structural motif offers a versatile platform for modulating TRPA1 activity and interaction mechanisms.
Ligustilide's interaction with TRPA1 may contribute to the sensory properties of celery and the pharmacological effects of traditional medicines.