Abstract
Efficient uptake to both cytoplasm and nucleus in live cells remains a key obstacle for G-quadruplex targeting fluorophores. We developed a Pt(IV) complex by oxidizing a bisphenanthrolinyl Pt(II) complex, which is our first generation G-quadruplex specific fluorogenic probe.15 The axial lipophilic ligand assists Pt(IV) pro-probe to enter live cells and reach the nucleus rapidly. In situ reduction of Pt(IV) pro-probe restores parental Pt(II) complex, and sequentially lights up both RNA and DNA G-quadruplexes in live cancerous cells simultaneously. Pt(IV) pro-probe shows potent cytotoxicity after long time incubation as a dual-functional theranostic agent.
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