Intrinsically fluorescent cytotoxic cisplatin analogues as DNA marker molecules.
Two square planar derivatives of Pt(en)Cl(2) with intrinsic fluorescence in aqueous solution at room temperature, with quantum yields (Phi) 0.11 and 0.10, respectively, have been synthesized and characterized as [Pt(en)(CG)Cl] (Complex 1) and [Pt(en)(CG)(2)] (Complex 2) (en = ethylenediamine, CG = cholylglycinate). Complexes 1 and 2 exchange just one ligand (chloride or cholylglycinate, respectively) when reacted with water or 5'-GMP to give the same chemical species. After reaction with DNA oligonucleotides or DNA plasmids, they show enhanced emission in the visible region, which lasts for long periods of time and makes them potentially useful DNA marker molecules. Incubation with nucleated blood cells followed by microscopic analyses revealed that they enter the cells within minutes of exposure, selectively stain the DNA, and persist after more than 48 h of exposure. Complexes 1 and 2 display cell cycle phase-independent cytotoxic activity against cisplatin-resistant CHO (Chinese hamster ovarian) tumor cells, with an early onset of their effects. Their slightly different biological effects, as compared to cisplatin, are considered to be linked to the bile acids and their vector properties and to the preferential formation of monoadducts.
Criado
Julio J
JJ
Departamentos de Química Inorgánica and Química Farmacéutica, Facultad de Farmacia, and Centro de Investigación del Cáncer (CIC), Campus Miguel de Unamuno, Universidad de Salamanca, 37007-Salamanca, Spain. jjct@usal.es
Fernández
Emilio R
ER
Manzano
Juan L
JL
Alonso
Angel
A
Barrena
Susana
S
Medarde
Manuel
M
Pelaez
Rafael
R
Tabernero
M Dolores
MD
Orfao
Alberto
A
D002453:Cell Cycle; D045744:Cell Line, Tumor; D002945:Cisplatin / Q000031:analogs & derivatives* / Q000737:chemistry; D003584:Cytological Techniques / Q000379:methods*; D004247:DNA / Q000032:analysis*; D005456:Fluorescent Dyes; D006801:Humans; D008024:Ligands; D013057:Spectrum Analysis
D005456:Fluorescent Dyes; D008024:Ligands; D004247:DNA; D002945:Cisplatin