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Summary: Study reveals a molecular action that enables cilantro to effectively delay seizures. One component of cilantro, dodecenal, binds to a specific part of the potassium channel to open them, reducing cellular excitability.
Source: UC Irvine
Herbs, including cilantro, have a long history of use as folk medicine anticonvulsants. Until now, many of the underlying mechanisms of how the herbs worked remained unknown. In a new study, researchers uncovered the molecular action that enables cilantro to effectively delay certain seizures common in epilepsy and other diseases.
The study, published in FASEB Journal, explains the molecular action of cilantro (Coriandrum sativum) as a highly potent KCNQ channel activator. This new understanding may lead to improvements in therapeutics and the development of more efficacious drugs.
“We discovered that cilantro, which has been used as a traditional anticonvulsant medicine, activates a class of potassium channels in the brain to reduce seizure activity,” said Geoff Abbott, Ph.D., professor of physiology and biophysics at the UCI School of Medicine and principal investigator on the study. “Specifically, we found one component of cilantro, called dodecenal, binds to a specific part of the potassium channels to open them, reducing cellular excitability. This specific discovery is important as it may lead to more effective use of cilantro as an anticonvulsant, or to modifications of dodecenal to develop safer and more effective anticonvulsant drugs.”
Researchers screened cilantro leaf metabolites, revealing that one – the long-chain fatty aldehyde (E)-2-dodecenal – activates multiple potassium channels including the predominant neuronal isoform and the predominant cardiac isoform, which are responsible for regulating electrical activity in the brain and heart. This metabolite was also found to recapitulate the anticonvulsant action of cilantro, delaying certain chemically-induced seizures. The results provide a molecular basis for the therapeutic actions of cilantro and indicate that this ubiquitous culinary herb is surprisingly influential upon clinically important potassium channels.
Documented use of botanical folk medicines stretches back as far as recorded human history. There is DNA evidence, dating back 48,000 years, that suggests the consumption of plants for medicinal use by Homo neanderthalensis. Archaeological evidence, dating back 800,000 years, suggests a non-food use of plants by Homo erectus or similar species. Today, evidence of the efficacy of botanical folk medicines ranges from anecdotal to clinical trials. In many cases, these “medicines” are currently consumed, often on a large scale, as foodstuffs or food flavoring. Cilantro, known as coriander in the UK, is one example. Cilantro has been consumed by human beings for at least 8,000 years. It was found in the tomb of Tutankhamen and is thought to have been cultivated by the ancient Egyptians.
“In addition to the anticonvulsant properties, cilantro also has reported anti-cancer, anti-inflammatory, anti-fungal, antibacterial, cardioprotective, gastric health and analgesic effects,” said Abbott. “And, the best part is it tastes good!”
Funding: This study was supported by the National Institutes of Health, National Institute of General Medicine Sciences and National Institute of Neurological Disorders and Stroke.
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Source: UC Irvine Media Contacts: Anne Warde – UC Irvine Image Source: The image is in the public domain.
Original Research: Open access “Cilantro leaf harbors a potent potassium channel–activating anticonvulsant”. Rían W. Manville and Geoffrey W. Abbott. FASEB Journal. doi:10.1096/fj.201900485R
Cilantro leaf harbors a potent potassium channel–activating anticonvulsant
Herbs have a long history of use as folk medicine anticonvulsants, yet the underlying mechanisms often remain unknown. Neuronal voltage-gated potassium channel subfamily Q (KCNQ) dysfunction can cause severe epileptic encephalopathies that are resistant to modern anticonvulsants. Here we report that cilantro (Coriandrum sativum), a widely used culinary herb that also exhibits antiepileptic and other therapeutic activities, is a highly potent KCNQ channel activator. Screening of cilantro leaf metabolites revealed that one, the long-chain fatty aldehyde (E)-2-dodecenal, activates multiple KCNQs, including the predominant neuronal isoform, KCNQ2/KCNQ3 [half maximal effective concentration (EC50), 60 ± 20 nM], and the predominant cardiac isoform, KCNQ1 in complexes with the type I transmembrane ancillary subunit (KCNE1) (EC50, 260 ± 100 nM). (E)-2-dodecenal also recapitulated the anticonvulsant action of cilantro, delaying pentylene tetrazole-induced seizures. In silico docking and mutagenesis studies identified the (E)-2-dodecenal binding site, juxtaposed between residues on the KCNQ S5 transmembrane segment and S4-5 linker. The results provide a molecular basis for the therapeutic actions of cilantro and indicate that this ubiquitous culinary herb is surprisingly influential upon clinically important KCNQ channels.
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