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Mucosal and blood-brain barrier transport kinetics of the plant N-alkylamide spilanthol using in vitro and in vivo models

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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 P-app 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 k(e) 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 K-1 of 796 mu l/(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.
Keywords
Plant N-alkylamide spilanthol, Blood-brain barrier, Caco-2 cells, Oral absorption, DRUG ABSORPTION, RAT MODEL, PERMEABILITY, PEPTIDES, BEHAVIOR, EXTRACT, ACMELLA, QUANTIFICATION, MONOLAYERS, CHEMISTRY

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Chicago
Veryser, Lieselotte, Lien Taevernier, Tanmayee Joshi, Pratima Tatke, Evelien Wynendaele, Nathalie Bracke, Sofie Stalmans, et al. 2016. “Mucosal and Blood-brain Barrier Transport Kinetics of the Plant N-alkylamide Spilanthol Using in Vitro and in Vivo Models.” Bmc Complementary and Alternative Medicine 16.
APA
Veryser, L., Taevernier, L., Joshi, T., Tatke, P., Wynendaele, E., Bracke, N., Stalmans, S., et al. (2016). Mucosal and blood-brain barrier transport kinetics of the plant N-alkylamide spilanthol using in vitro and in vivo models. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE, 16.
Vancouver
1.
Veryser L, Taevernier L, Joshi T, Tatke P, Wynendaele E, Bracke N, et al. Mucosal and blood-brain barrier transport kinetics of the plant N-alkylamide spilanthol using in vitro and in vivo models. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE. 2016;16.
MLA
Veryser, Lieselotte, Lien Taevernier, Tanmayee Joshi, et al. “Mucosal and Blood-brain Barrier Transport Kinetics of the Plant N-alkylamide Spilanthol Using in Vitro and in Vivo Models.” BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 16 (2016): n. pag. Print.
@article{8042618,
  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 P-app 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 k(e) 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 K-1 of 796 mu l/(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.},
  articleno    = {177},
  author       = {Veryser, Lieselotte and Taevernier, Lien and Joshi, Tanmayee and Tatke, Pratima and Wynendaele, Evelien and Bracke, Nathalie and Stalmans, Sofie and Peremans, Kathelijne and Burvenich, Christian and Risseeuw, Martijn and De Spiegeleer, Bart},
  issn         = {1472-6882},
  journal      = {BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE},
  keyword      = {Plant N-alkylamide spilanthol,Blood-brain barrier,Caco-2 cells,Oral absorption,DRUG ABSORPTION,RAT MODEL,PERMEABILITY,PEPTIDES,BEHAVIOR,EXTRACT,ACMELLA,QUANTIFICATION,MONOLAYERS,CHEMISTRY},
  language     = {eng},
  pages        = {12},
  title        = {Mucosal and blood-brain barrier transport kinetics of the plant N-alkylamide spilanthol using in vitro and in vivo models},
  url          = {http://dx.doi.org/10.1186/s12906-016-1159-0},
  volume       = {16},
  year         = {2016},
}

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