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Green fluorescent protein chromophore derivatives as a new class of aldose reductase inhibitors.
European Journal of Medicinal Chemistry 2017 January 6
A number of (Z)-4-arylmethylene-1H-imidazol-5(4H)-ones, which are related to the fluorescent chromophore of the Aequorea green fluorescent protein (GFP), have been synthesized and evaluated their in vitro inhibitory activity against recombinant human aldose reductase for the first time. The GFP chromophore model 1a, with a p-hydroxy group on the 4-benzylidene and a carboxymethyl group on the N1 position, exhibited strong bioactivity with an IC50 value of 0.36 μM. This efficacy is higher than that of sorbinil, a known highly potent aldose reductase inhibitor. Compound 1h, the 2-naphtylmethylidene analogue of 1a, exhibited the best inhibitory effect among the tested copounds with an IC50 value of 0.10 μM. Structure-activity relationship studies combined with docking simulations revealed the interaction mode of the newly synthesized inhibitors toward the target protein as well as the structural features required to gain a high inhibitory activity. In conclusion, the GFP chromophore model compounds synthesized in this study have proved to be potential drugs for diabetic complications.
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