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New conjugate of G-quadruplex ligand, cationic tris(methylpyridinium)porphyrin, and its Zn(II) and Mn(III) metal complexes with a neutral intercalating agent imidazophenazine were synthesized. The synthesis was based on the coupling of carboxyalkyl derivative of the porphyrin with N1-aminoalkylated dye. Spectral-fluorescent studies and density functional quantum-chemical calculations suggest the formation of intramolecular complexes between the two chromophores for non-metalated hybrid and zinc(II) derivative. The conjugates have been found to inhibit the growth of tumor cells of mouse Lewis lung carcinoma in vitro at micromolar concentrations. Metal complexes were several times more active than the non-metalated hybrid. The most efficient Zn(II) complex suppressed the tumor cells with IC50 5.9 M
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Dubey et al. (2011) studied this question.
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