Irvine, Calif. - September 30, 2019 - Common herbs, including lavender, fennel and chamomile, have a long history of use as folk medicines used to lower blood pressure. In a new study, University of California, Irvine researchers explain the molecular mechanisms that make them work.
Published today in Proceedings of the National Academy of Sciences (PNAS), the study illustrates how many of the known traditional botanical plants used to lower blood pressure activate a specific potassium channel (KCNQ5) in blood vessels. KCNQ5, together with other potassium channels including KCNQ1 and KCNQ4, is expressed in vascular smooth muscle. When activated, KCNQ5 relaxes blood vessels, making it a logical mechanism for at least part of the hypotensive actions of certain botanical folk medicines.
"We found KCNQ5 activation to be a unifying molecular mechanism shared by a diverse range of botanical hypotensive folk medicines. Lavandula angustifolia, commonly called lavender, was among those we studied. We discovered it to be among the most efficacious KCNQ5 potassium channel activators, along with fennel seed extract and chamomile," said Geoff Abbott, PhD, professor of physiology and biophysics at the UCI School of Medicine and senior investigator on the study.
Interestingly, the KCNQ5-selective potassium channel activation feature found in the botanicals is lacking in the modern synthetic pharmacopeia. Until now, it seems to have eluded conventional screening methods utilizing chemical libraries, which may account for why it is not a recognized feature of synthetic blood pressure medications.
"Our discovery of these botanical KCNQ5-selective potassium channel openers may enable development of future targeted therapies for diseases including hypertension and KCNQ5 loss-of-function encephalopathy," said Abbott.
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, even suggests non-food usage of plants by Homo erectus or similar species. Today, evidence of the efficacy of botanical folk medicines ranges from anecdotal to clinical trials, however the underlying molecular mechanisms often remain elusive.
This study was supported by the National Institutes of Health, National Institute of General Medical Sciences and the National Institute of Neurological Disorders and Stroke. Also involved in the study were UCI's Rían Manville, PhD, PhD student Kaitlyn Redford and Benjamin Katz, PhD, and from the University of Copenhagen, Denmark, PhD student Jennifer van der Horst and Thomas Jepps, PhD.
About the UCI School of Medicine: Each year, the UCI School of Medicine educates more than 400 medical students, as well as 200 doctoral and master's students. More than 600 residents and fellows are trained at UC Irvine Medical Center and affiliated institutions. The School of Medicine offers an MD; a dual MD/PhD medical scientist training program; and PhDs and master's degrees in anatomy and neurobiology, biomedical sciences, genetic counseling, epidemiology, environmental health sciences, pathology, pharmacology, physiology and biophysics, and translational sciences. Medical students also may pursue an MD/MBA, an MD/master's in public health, or an MD/master's degree through one of three mission-based programs: the Health Education to Advance Leaders in Integrative Medicine (HEAL-IM), the Leadership Education to Advance Diversity-African, Black and Caribbean (LEAD-ABC), and the Program in Medical Education for the Latino Community (PRIME-LC). The UCI School of Medicine is accredited by the Liaison Committee on Medical Accreditation and ranks among the top 50 nationwide for research. For more information, visit som.uci.edu.