title: A monomethine cyanine dye Cyan 40 for two-photon-excited fluorescence detection of nucleic acids and their visualization in live cells.
abstract: Monomethine cyanine dye 4-((1-methylbenzothiazolyliliden-2)methyl)-1,2,6-trimethylpyridinium perchlorate (Cyan 40) was investigated as a two-photon-excited fluorescence probe for nucleic acids (NA). Cyan 40 has been shown to demonstrate efficient two-photon-excited fluorescence in the presence of NA in vitro in contrast to solutions without NA. Two-photon confocal laser scanning microscopy (TPCLSM) and two-photon laser scanning microspectrofluorometry were used to check the possibility of using Cyan 40 as two-photon-excited fluorescence label for NA in living cells. Study of dye effect on viability of cells was also carried out. We ascertained that Cyan 40 is a cell-permeant dye, manifesting efficient two-photon-excited fluorescence when bound to NA in living cells, without any significant influence on viability of cells. TPCLSM images obtained from stained cells indicate preferential RNA staining by Cyan 40 compared with DNA.
authors.affiliation: Department of Chemistry, Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo, Buffalo, NY 14260, USA. tyo2@acsu.buffalo.edu
authors.forename: Tymish Y
authors.initials: TY
authors.lastname: Ohulchanskyy
authors.forename: Haridas E
authors.initials: HE
authors.lastname: Pudavar
authors.forename: Sergiy M
authors.initials: SM
authors.lastname: Yarmoluk
authors.forename: Valeriy M
authors.initials: VM
authors.lastname: Yashchuk
authors.forename: Earl J
authors.initials: EJ
authors.lastname: Bergey
authors.forename: Paras N
authors.initials: PN
authors.lastname: Prasad
mesh_terms: D002232:Carbocyanines / Q000737:chemistry*; D006801:Humans; D009696:Nucleic Acids / Q000032:analysis*; D017785:Photons; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014407:Tumor Cells, Cultured
chemical_list: D002232:Carbocyanines; C467363:Cyan 40; D009696:Nucleic Acids