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- Title
Mucosal and blood-brain barrier transport kinetics of the plant N-alkylamide spilanthol using in vitro and in vivo models.
- Authors
Veryser, Lieselotte; Taevernier, Lien; Joshi, Tanmayee; Tatke, Pratima; Wynendaele, Evelien; Bracke, Nathalie; Stalmans, Sofie; Peremans, Kathelijne; Burvenich, Christian; Risseeuw, Martijn; De Spiegeleer, Bart
- Abstract
Background: N-alkylamides (NAAs) are a large group of secondary metabolites occurring in more than 25 plant families which are often used in traditional medicine. A prominent active NAA is spilanthol. The general goal was to quantitatively investigate the gut mucosa and blood-brain barrier (BBB) permeability pharmacokinetic properties of spilanthol. Methods: Spilanthes acmella (L.) L. extracts, as well as purified spilanthol were used to investigate (1) the permeation of spilanthol through a Caco-2 cell monolayer in vitro, (2) the absorption from the intestinal lumen after oral administration to rats, and (3) the permeation through the BBB in mice after intravenous injection. Quantification of spilanthol was performed using a validated bio-analytical UPLC-MS2 method. Results: Spilanthol was able to cross the Caco-2 cell monolayer in vitro from the apical-to-basolateral side and from the basolateral-to-apical side with apparent permeability coefficients Papp between 5.2 ⋅ 10-5 and 10.2 ⋅ 10-5 cm/h. This in vitro permeability was confirmed by the in vivo intestinal absorption in rats after oral administration, where an elimination rate constant ke of 0.6 h-1 was obtained. Furthermore, once present in the systemic circulation, spilanthol rapidly penetrated the blood-brain barrier: a highly significant influx of spilanthol into the brains was observed with a unidirectional influx rate constant K1 of 796 µl/(g ⋅ min). Conclusions: Spilanthol shows a high intestinal absorption from the gut into the systemic circulation, as well as a high BBB permeation rate from the blood into the brain.
- Subjects
BLOOD-brain barrier; INTESTINAL mucosa physiology; PHYTOTHERAPY; CAPILLARIES; ALTERNATIVE medicine; ANIMAL experimentation; BIOLOGICAL models; CELL physiology; ORAL drug administration; RATS; RESEARCH funding; IN vitro studies; IN vivo studies; ANATOMY; PHYSIOLOGY
- Publication
BMC Complementary & Alternative Medicine, 2016, Vol 16, p1
- ISSN
1472-6882
- Publication type
Article
- DOI
10.1186/s12906-016-1159-0