Dofetilide

Tikosyn®
A Potent and Highly Selective Blocker of KV11.1 (hERG) Channels
Cat #: D-100
Alternative Name Tikosyn®
  • Lyophilized Powder
  • Bioassay Tested
  • Source Synthetic
    MW: 441.6
    Purity: >98%
    Effective concentration 0.5-100 μM.
    Chemical name 1-(4-Methanesulphonamidophenoxy)-2-[N-(4-methanesulphonamidophenethyl)-N-methylamino]ethane.
    Molecular formula C19H27N3O5S2.
    CAS No.: 115256-11-6.
    Activity Dofetilite is a class II antiarrytmic agent which blocks the fast delayed rectifier cardiac potassium current, mostly carried out by the KV11.1 (hERG) channels1. Dofetilide was effective in inhibiting KV11.1 channels in Xenopus oocytes with 1 μM, thereby eliminating the current2. 500 nM Dofetilide enhanced smooth muscle from bovine epididymal duct contractions as expected by blocking KV11.1 channels in this preparation3.
      • Roukoz, H. and Saliba, W. (2007) Exp.Rev. Cardiovas. Ther. 5, 9.

      • Xu, X. et al. (2008) Mol. Pharmacol. 73, 1709.

      • Mewe, M. et al. (2008) Am. J. Physiol. Regul. Integr. Comp. Physiol. 294, R895.

    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. Centrifuge all product preparations before use (10000 x g 5 min).
    Storage of solutions Up to four weeks at 4°C or three months at -20°C.
      • Alomone Labs Dofetilide inhibits KV11.1 (hERG) currents in Xenopus oocytes.
        A. Time course of current amplitude at -20 mV (see B for the voltage stimulating protocol) before and during the application of 10 μM Dofetilide (#D-100) (indicated by bar) and upon wash, demonstrating potent inhibition. B. Superimposed example traces of KV11.1 channel current responses, before and during application of 10 μM Dofetilide. Currents were elicited by 150 ms voltage step from -100 mV to 20 mV followed by a 150 ms step to -20 mV (demonstrated on top) , applied every 10 sec.
      • The KV11.1 (HERG) channel is a member of the ether-a-go-go (EAG) subfamily of voltage-dependent K+ channels that includes the related proteins KV11.2 and KV11.3 (erg2 and erg3). The KV11.1 current is characterized by strong inward rectification with slow activation and very rapid inactivation kinetics. The channel is expressed in the brain and heart (where it underlies the IKr current) and has a central role in mediating repolarization of action potentials1,2.

        Mutations in the KV11.1 channel cause inherited long QT syndrome (LQTS) or abnormalities in the repolarization of the heart that are associated with life-threatening arrhythmias and sudden death. All the identified KV11.1 mutations produce loss of function of the channel via several cellular mechanisms ranging from alterations of gating properties, channel permeability/selectivity and intracellular channel trafficking that decreases the number of channels that reach the cell membrane1,2.

        Lately, drug-induced forms of LQTS have been reported for a wide range of non-cardiac drugs including antihistamines, psychoactive agents and antimicrobials. All these drugs potently block the KV11.1 channel as an unintended side effect, prompting regulatory drug agencies to issue recommendations for the testing of new drugs for their potential KV11.1 blocking effect.

        In addition, KV11.1 expression was found to be upregulated in several tumor cell lines of different histogenesis suggesting that it confers the cells some advantage in cell proliferation. Indeed, in several studies it has been shown that inhibition of the KV11.1 current leads to a decrease in tumor cell proliferation3.

        Dofetilite is a class II antiarrythmic agent which blocks the fast delayed rectifier cardiac K+ current, mostly carried out by KV11.1 (hERG) channels4. In mouse atrial tumor myocytes (AT-1 cells), dofetilide was very effective in inhibiting the IKr current with IC50 of 12 nM5. Dofetilide was effective in inhibiting KV11.1 channels in Xenopus oocytes with 1 µM, thereby eliminating the current6. 500 nM Dofetilide enhanced smooth muscle from bovine epididymal duct contractions as expected by blocking KV11.1 channels in this preparation7.

    Target KV11.1 K+ channels
    Last update: 27/06/2019

    Dofetilide (#D-100) is a highly pure, synthetic, and biologically active compound.

    For research purposes only, not for human use