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Lipophilic ruthenium complexes with tuned cell membrane affinity and photoactivated uptake

Frida Svensson (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Maria Matson (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; M. Li ; Per Lincoln (Institutionen för kemi- och bioteknik, Fysikalisk kemi)
Biophysical Chemistry (0301-4622). Vol. 149 (2010), 3, p. 102-106.
[Artikel, refereegranskad vetenskaplig]

Ruthenium dipyridophenazine (dppz) complexes are virtually non-emissive in aqueous solutions but show strong luminescence in hydrophobic environments, making them interesting as molecular probes in cellular imaging. We show by luminescence spectroscopy that by substituting the dppz ligand with alkyl ether chains of increasing length the complexes can be tuned from preferential intercalation into DNA to insertion in model phospholipid membranes Confocal laser scanning microscopy (CLSM) on methanol fixed CHO-K1 cells show an analogous distribution in the cell, where the least hydrophobic complex exclusively stains the nucleus whereas the more hydrophobic ones seem to predominantly stain membrane structures in the cytoplasm In live cells CLSM show that initially only the more hydrophobic derivatives stain the plasma membrane However, brief further exposure to the laser light causes permeabilization of the membrane and accumulation of extracellular ruthenium complexes in internal cellular structures, similarly to the distribution found in fixed cells. (C) 2010 Elsevier B V All rights reserved

Nyckelord: Ruthenium dipyridophenazine complex, Luminescent cellular probes, Membrane binding, Photoactivated cellular uptake, Confocal laser, scanning microscopy, Emission spectroscopy, polypyridyl complex, liposome membranes, light-switch, dna, mechanism, probes

Denna post skapades 2010-08-12.
CPL Pubid: 124456


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Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)



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