title: Two-photon fluorescence absorption and emission spectra of dyes relevant for cell imaging.
abstract: Two-photon absorption and emission spectra for fluorophores relevant in cell imaging were measured using a 45 fs Ti:sapphire laser, a continuously tuneable optical parametric amplifier for the excitation range 580-1150 nm and an optical multichannel analyser. The measurements included DNA stains, fluorescent dyes coupled to antibodies as well as organelle trackers, e.g. Alexa and Bodipy dyes, Cy2, Cy3, DAPI, Hoechst 33342, propidium iodide, FITC and rhodamine. In accordance with the two-photon excitation theory, the majority of the investigated fluorochromes did not reveal significant discrepancies between the two-photon and the one-photon emission spectra. However, a blue-shift of the absorption maxima ranging from a few nanometres up to considerably differing courses of the spectrum was found for most fluorochromes. The potential of non-linear laser scanning fluorescence microscopy is demonstrated here by visualizing multiple intracellular structures in living cells. Combined with 3D reconstruction techniques, this approach gives a deeper insight into the spatial relationships of subcellular organelles.
authors.affiliation: Biomedizinische Strukturforschung (A0602), Deutsches Krebsforschungszentrum, PO Box 101949, D-69009 Heidelberg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Bestvater
authors.forename: E
authors.initials: E
authors.lastname: Spiess
authors.forename: G
authors.initials: G
authors.lastname: Stobrawa
authors.forename: M
authors.initials: M
authors.lastname: Hacker
authors.forename: T
authors.initials: T
authors.lastname: Feurer
authors.forename: T
authors.initials: T
authors.lastname: Porwol
authors.forename: U
authors.initials: U
authors.lastname: Berchner-Pfannschmidt
authors.forename: C
authors.initials: C
authors.lastname: Wotzlaw
authors.forename: H
authors.initials: H
authors.lastname: Acker
mesh_terms: D002460:Cell Line; D005456:Fluorescent Dyes / Q000378:metabolism*; D006657:Histones / Q000378:metabolism*; D006801:Humans; D008856:Microscopy, Fluorescence / Q000379:methods; D017785:Photons; D013050:Spectrometry, Fluorescence / Q000379:methods; D013194:Staining and Labeling / Q000379:methods
chemical_list: D005456:Fluorescent Dyes; D006657:Histones