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Synthetic Curcumin Derivatives Inhibit Jun-Fos-DNA Complex Formation

  • Kim, Hyun-Kyung (School of Chemistry, College of Natural Sciences, Seoul National University) ;
  • Yang, Chul-Hak (School of Chemistry, College of Natural Sciences, Seoul National University)
  • Published : 2004.12.20

Abstract

Jun/Fos, a crucial factor in transmitting the tumor-promoting signal from the extracellular environment to the nuclear transcription machinery, has a dimerization interface possessing several coiled structural properties. Jun and Fos can interact with the DNA regulatory region, AP-1 (Activator Protein-1), which is composed of 5'-TGAC/GTCA-3'.$^1$ Curcumin is a well-known anticancer and anti-inflammatory compound.$^{2,3}$ It also acts as an inhibitor of the Jun-Fos function. c-Fos and c-Jun with a bZIP region are overexpressed in BL21 E. coli and purified with an $Ni^{2+}$ affinity column. The inhibitors of Fos-Jun-AP-1 complex formation were searched through the EMSA (electrophoresis mobility shift assay) experiment, and new curcuminoids were synthesized and investigated as to their inhibitory effect on the same system. Two curcuminoids showed a stronger inhibitory effect than curcumin. This inhibitory activity was quantified with EMSA. 1,7-bis(4-methyl)-1,6-heptadiene-3,5-dione (BJC003) and 1,7-bis(4-hydroxy-5-methoxy-3-nitrophenyl)-1,6-heptadiene-3,5-dione (BJC005) showed remarkably high inhibitory activities. $IC_{50}$ of 1,7-bis(4-methyl)-1,6-heptadiene-3,5-dione (BJC003) and 1,7-bis(4-hydroxy-5-methoxy-3-nitrophenyl)-1,6-heptadiene-3,5-dione (BJC005) are 8.98 ${\mu}M$ and 5.40 ${\mu}M$, respectively. However, 1,7-bis(4-methyl-3-nitrophenyl)-1,6-heptadiene-3,5-dione (BJC004) did not show inhibitory activity.

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  2. Small Molecule Inhibitors Targeting Activator Protein 1 (AP-1) vol.57, pp.16, 2014, https://doi.org/10.1021/jm5004733
  3. Drug Targets for Cardiovascular-Safe Anti-Inflammatory: In Silico Rational Drug Studies vol.11, pp.6, 2016, https://doi.org/10.1371/journal.pone.0156156