Differential regulation of calcium signalling pathways by components of Piper methysticum ('Awa).

Autor: Shimoda LM; Laboratory of Immunology and Signal Transduction, Division of Natural Sciences and Mathematics, Chaminade University, Honolulu, HI, United States., Showman A, Baker JD, Lange I, Koomoa DL, Stokes AJ, Borris RP, Turner H
Jazyk: angličtina
Zdroj: Phytotherapy research : PTR [Phytother Res] 2015 Apr; Vol. 29 (4), pp. 582-90. Date of Electronic Publication: 2015 Jan 30.
DOI: 10.1002/ptr.5291
Abstrakt: Kava is a soporific, anxiolytic and relaxant in widespread ritual and recreational use throughout the Pacific. Traditional uses of kava by indigenous Pacific Island peoples reflect a complex pharmacopeia, centered on GABA-ergic effects of the well-characterized kavalactones. However, peripheral effects of kava suggest active components other than the CNS-targeted kavalactones. We have previously shown that immunocytes exhibit calcium mobilization in response to traditionally prepared kava extracts, and that the kavalactones do not induce these calcium responses. Here, we characterize the complex calcium-mobilizing activity of traditionally prepared and partially HPLC-purified kava extracts, noting induction of both calcium entry and store release pathways. Kava components activate intracellular store depletion of thapsigargin-sensitive and -insensitive stores that are coupled to the calcium release activated (CRAC) current, and cause calcium entry through non-store-operated pathways. Together with the pepper-like potency reported by kava users, these studies lead us to hypothesize that kava extracts contain one or more ligands for the transient receptor potential (TRP) family of ion channels. Indeed, TRP-like conductances are observed in kava-treated cells under patch clamp. Thus TRP-mediated cellular effects may be responsible for some of the reported pharmacology of kava.
(Copyright © 2015 John Wiley & Sons, Ltd.)
Databáze: MEDLINE
Externí odkaz: