Bright and photostable push-pull pyrene dye visualizes lipid order variation between plasma and intracellular membranes.
Fiche publication
Date publication
janvier 2016
Journal
Scientific reports
Auteurs
Membres identifiés du Cancéropôle Est :
Pr MELY Yves, Dr KLYMCHENKO Andrey
Tous les auteurs :
Niko Y, Didier P, Mely Y, Konishi G, Klymchenko AS
Lien Pubmed
Résumé
Imaging lipid organization in cell membranes requires advanced fluorescent probes. Here, we show that a recently synthesized push-pull pyrene (PA), similarly to popular probe Laurdan, changes the emission maximum as a function of lipid order, but outperforms it by spectroscopic properties. In addition to red-shifted absorption compatible with common 405 nm diode laser, PA shows higher brightness and much higher photostability than Laurdan in apolar membrane environments. Moreover, PA is compatible with two-photon excitation at wavelengths >800 nm, which was successfully used for ratiometric imaging of coexisting liquid ordered and disordered phases in giant unilamellar vesicles. Fluorescence confocal microscopy in Hela cells revealed that PA efficiently stains the plasma membrane and the intracellular membranes at >20-fold lower concentrations, as compared to Laurdan. Finally, ratiometric imaging using PA reveals variation of lipid order within different cellular compartments: plasma membranes are close to liquid ordered phase of model membranes composed of sphingomyelin and cholesterol, while intracellular membranes are much less ordered, matching well membranes composed of unsaturated phospholipids without cholesterol. These differences in the lipid order were confirmed by fluorescence lifetime imaging (FLIM) at the blue edge of PA emission band. PA probe constitutes thus a new powerful tool for biomembrane research.
Mots clés
2-Naphthylamine, analogs & derivatives, Cell Membrane, metabolism, Cholesterol, chemistry, Fluorescent Dyes, chemical synthesis, HeLa Cells, Humans, Intracellular Membranes, metabolism, Laurates, chemistry, Microscopy, Confocal, Microscopy, Fluorescence, Phosphatidylcholines, chemistry, Pyrenes, chemical synthesis, Sensitivity and Specificity, Sphingomyelins, chemistry, Unilamellar Liposomes, chemistry
Référence
Sci Rep. 2016 Jan;6:18870