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Development of pyrene-based fluorescent ether lipid as inhibitor of SK3 ion channels.

Abstract
We report the synthesis of three bioactive pyrene-based fluorescent analogues of Ohmline which is the most efficient and selective inhibitor of SK3 ion channel. The interaction of these Ohmline-pyrene (OP1-3) with liposomes of different composition reveals that only OP2 and OP3 are readily integrated into liposomes. Fluorescence measurements indicate that, depending on their concentration, OP2 and OP3 exist either as monomer or as a mixture of monomer and excimers within the liposome bilayer. Among the three Ohmline Pyrene compounds (OP1-3) only OP2 is able to reduce SK3 currents and is the first efficient fluorescent modulator of SK3 channel as revealed by patch clamp measurements (- 71.3 ± 13.3% at 10 μM) and by its inhibition of SK3-dependent cancer cell migration at (-32.5% ± 4.8% at 1 μM). We also report the first fluorescence study on living breast cancer cells (MDA-MB-231) showing that OP2 is rapidly integrated in bio-membranes followed by cell internalization.
AuthorsAlicia Bauduin, Marion Papin, Aurélie Chantôme, Hélène Couthon, Laure Deschamps, Jose Requejo-Isidro, Christophe Vandier, Paul-Alain Jaffrès
JournalEuropean journal of medicinal chemistry (Eur J Med Chem) Vol. 209 Pg. 112894 (Jan 01 2021) ISSN: 1768-3254 [Electronic] France
PMID33049604 (Publication Type: Journal Article)
CopyrightCopyright © 2020 Elsevier Masson SAS. All rights reserved.
Chemical References
  • 1-O-hexadecyl-2-O-methylglycero-3-lactose
  • Fluorescent Dyes
  • Glycolipids
  • KCNN3 protein, human
  • Potassium Channel Blockers
  • Pyrenes
  • Small-Conductance Calcium-Activated Potassium Channels
Topics
  • Cell Line, Tumor
  • Cell Movement (drug effects)
  • Fluorescent Dyes (chemistry, pharmacology)
  • Glycolipids (chemistry, pharmacology)
  • HEK293 Cells
  • Humans
  • Potassium Channel Blockers (chemistry, pharmacology)
  • Pyrenes (chemistry, pharmacology)
  • Small-Conductance Calcium-Activated Potassium Channels (antagonists & inhibitors, metabolism)

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