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Published on: August 16, 2018
GABA(A) receptor modulation by terpenoids from Sideritis extracts
Artur Kessler1, Hilal Sahin-Nadeem, Sarah C R Lummis
1Department of Chemistry and Pharmacy, Food Chemistry Division, University of Erlangen-Nuernberg, Erlangen, Germany.
Sideritis extracts modulate GABAA receptors. Researchers identified specific terpenes like carvacrol, isopulegol, and pinocarveol as potent modulators, acting independently of the gamma-2 subunit.
Area of Science:
- Pharmacology
- Neuroscience
- Phytochemistry
Background:
- Sideritis extracts are known to modulate GABAA receptors.
- Identifying specific active compounds is crucial for understanding their mechanism of action.
Purpose of the Study:
- To identify single volatile substances from Sideritis extracts responsible for GABAA receptor modulation.
- To investigate the role of specific chemical structures in GABAA receptor interaction.
Main Methods:
- Gas chromatography (GC) for volatile substance identification.
- Electrophysiological recordings in Xenopus oocytes and human embryonic kidney cells.
- High-throughput screening of terpenoids on GABAA receptor function.
Main Results:
- Carvacrol demonstrated high potency in modulating GABAA receptors (α1β2 and α1β2γ2 subunits).
- Isopulegol, pinocarveol, verbenol, and myrtenol were identified as the most effective terpenoid modifiers.
- Observed modulatory effects were independent of the γ2 subunit.
Conclusions:
- Terpene action on GABAA receptors is likely linked to hydroxyl groups and bicyclic structures.
- A proposed allosteric modulation mechanism, independent of the γ2 subunit, similar to alcohols and anesthetics.
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