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First Synthesis of an Oridonin-Conjugated Iridium(III) Complex for the Intracellular Tracking of NF-κB in Living Cells.
Chemistry : a European Journal 2017 April 7
NF-κB is a critical transcription factor that plays an important role in mediating inflammation, the immune response, and cell proliferation. The activation of NF-κB leads to an enhancement of proinflammatory mediator expression, which is implicated in the pathogenesis of a variety of diseases. Therefore, methods that allow the intracellular tracking of NF-κB are particularly attractive because they can provide information regarding the pathways or stimulation responses that are involved in the activation of NF-κB. In this work, we report a novel platform to track intracellular NF-κB by employing the conjugated iridium(III) complex 1, which was synthesized through the unique combination of a luminescent iridium(III) moiety with the natural product oridonin. Experiments conducted with p50 knockdown cells revealed that complex 1 could detect the p50 subunit of NF-κB in cellulo. Furthermore, complex 1 tracked NF-κB translocation induced by tumor necrosis factor-α (TNF-α) as a model stimulus, without affecting the translocation process itself. To the best of our knowledge, complex 1 is the first metal-based compound that has been reported to be capable of monitoring intracellular NF-κB in living cells.
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