Overview
Lyophilized Powder yes
Origin Penicillium paxilli.
Source Natural
MW: 435.6
Purity: >98% (HPLC)
Effective concentration 10-100 nM.
Structure
Chemical name (2R,4bS,6aS,12bS,12cR,14aS)-5,6,6a,7,12,12b,12c,13,14,1 4a-Decahydro-4b-hydroxy-2-(1-hydroxy-1-methylethyl)-12b ,12c-dimethyl-2H-pyrano[2'',3'':5',6']benz[1',2':6,7]in deno[1,2-b]indol-3(4bH)-one.
Molecular formula C27H33NO4.
CAS No.: 57186-25-1
Activity Paxilline is a selective blocker of high-conductance Ca2+-activated (Maxi-K) K+ channels.
Shipping and storage Shipped at room temperature. Product as supplied can be stored intact at room temperature for several weeks. For longer periods, it should be stored at -20°C.
Solubility DMSO or acetone. Centrifuge all product preparations before use (10000 x g 5 min).
Storage of solutions Up to one week at 4°C or three months at -20°C.
Our bioassay
Alomone Labs Paxilline inhibits KCa1.1 (BK) channels heterologously expressed in Xenopus oocytes.Left: The effect of 100 nM Paxilline (#P-450) (a), Penitrem A (P-650) (b), and Verruculogen (#V-500) (c) on BK currents. Time course of current amplitude changes upon sequential application of the three toxins. Right: Example of current responses to 100 ms depolarization before (red) and during (black) perfusion of 500 nM Paxilline.
Scientific background
Paxilline is a selective blocker of KCa1.1 (high-conductance Ca2+-activated K+, BK) channels. It belongs to a set of tremorgenic indole alkaloids which are lipid soluble and also include Penitrem A and Verruculogen.2
Paxilline enhanced the electrically induced twitch contractions in guinea pig ileum, without influencing the contractions provoked by exogenous acetylcholine.1 Paxilline was shown to inhibit the peptidyle toxin resistant combination a+b4 channels (for more background see 3) expressed in CHO cells.4 It was shown to be as potent as Iberiotoxin in action potential broadening in hippocampus and amygdala.4,5
Paxilline also inhibits intracellular Ca2+-ATPases (SERCA) with IC50s between 5 and 10 µM6.
Target KCa K+ channels, SERCA pump
Lyophilized Powder
Image & Title 
Alomone Labs Paxilline inhibits KCa1.1 channel currents in isolated canine intracardiac neurons.Representative current traces show a total blockage of the fast-activated current component and a reduction of the slow outward component caused by 100 nM Paxilline (#P-450).Adapted from Perez, G.J. et al. (2013) Am. J. Physiol. 304, C280. with permission of The American Physiological Society.
Alomone Labs Paxilline inhibits KCa1.1 channel currents in isolated canine intracardiac neurons.Representative current traces show a total blockage of the fast-activated current component and a reduction of the slow outward component caused by 100 nM Paxilline (#P-450).Adapted from Perez, G.J. et al. (2013) Am. J. Physiol. 304, C280. with permission of The American Physiological Society.
For research purposes only, not for human use
Last Update: 07/05/2024
Specifications
Citations
Citations
