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The indole ring, adamantane, and urea groups are important components of bioactive molecules. The orphan nuclear receptor Nur77 as a unique transcription factor encoded by an immediate early gene is a potential therapeutic target for cancer treatment. We synthesized a series of 1-(2-(adamantane-1-yl)-1H-indol-5-yl)-3-substituted urea/thiourea derivatives and identified which of these potential anticancer candidates could modulate the expression and activity of Nur77. The synthesized compounds were initially evaluated for their anti-proliferative activity against H460 lung cancer cells, HepG2 liver cancer cells, and MCF-7 breast cancer cells. Major compounds were found to be active against these tested cancer cell lines. The compounds with IC50 values down to 20 μM exhibited selective cytotoxicity effects on the human lung cancer cell line (H460) and the normal lung cell line (MCR-5). Compounds 7n, 7s, and 7w induced Nur77-expression in a time- and dose-dependent manner in H460 cells. Compounds 7n and 7s strongly induced Parp cleavage in H460 cells, but 7w resulted in a slight induction of apoptosis. The apoptotic effect of 7s was largely inhibited when the Nur77 was knocked down by shRNA. This indicated that Nur77 served as a critical mediator for the anticancer action of 7s. The molecular docking study between Nur77 and 7s revealed that compound 7s exhibited a promising binding affinity with Nur77. These findings will provide a direction for the developing Nur77 regulator as anticancer agents.

Synthesis and biological evaluation of 1-(2-(adamantane-1-yl)-1H-indol-5-yl)-3-substituted urea/thiourea derivatives as anticancer agents