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Labrador tea encompasses various closely related plants within the Rhododendron genus. These evergreen shrubs, known for their fuzzy leaves, are a staple in herbal teas used by the Inuit and Indigenous peoples of the U.S. and Canada. Folk wisdom has long attributed these teas with the ability to treat a range of ailments, including colds, flu, headaches, stomach aches, and nasal congestion. Previous studies have also hinted at their antimicrobial properties, which could combat antibiotic-resistant microbes.

One particular variety, Dwarf Labrador tea, or Rhododendron subarcticum, thrives in the harsh subarctic conditions of regions from Alaska to Siberia. Despite its extensive use in traditional medicine, its chemical composition and antimicrobial potential remain largely unexplored. This prompted Normand Voyer and colleagues to embark on a groundbreaking study to unveil the constituents of R. subarcticum for the first time and evaluate its antiparasitic properties.

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The research involved collecting R. subarcticum leaves from Nunavik, Northern Quebec, followed by the extraction of essential oils. Advanced analytical techniques, including gas chromatography and mass spectrometry, identified 53 compounds, with ascaridole constituting 64.7% and p-cymene at 21.1%. Notably, this unique combination of compounds had not been previously documented in closely related North American Labrador tea species, although it had been found in European and Asian subspecies.

To assess its potential as an antimalarial agent, the team exposed two strains of the malaria-causing parasite Plasmodium falciparum to the essential oil and pure ascaridole. Encouragingly, ascaridole emerged as the primary component responsible for combating both strains, including one that was resistant to conventional antimalarial drugs. This aligns with the historical use of ascaridole-rich traditional medicines for their antiparasitic properties.

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This groundbreaking work underscores the importance of investigating and preserving plants used in traditional medicine, especially those from climates vulnerable to climate change. Labrador tea, deeply rooted in Indigenous culture, holds the promise of providing valuable tools in the fight against malaria and other infectious diseases.

Sources

1. The Traditional Medicine and Modern …Traditional Indigenous medicine in North America
2. Integrating traditional indigenous medicine and western …