BACKGROUND: Oleanolic acid is a natural plant adaptogen, and tryptamine is a natural psychoactive drug. To compare their effects of with the effect of their derivatives, tryptamine and fluorotryptamine amides of oleanolic acid were designed and synthesized. METHODS: The target amides were investigated for their pharmacological effect, and basic supramolecular self-assembly characteristics. Four human cancer cell lines were involved in the screening tests performed by standard methods. RESULTS: The ability to display cytotoxicity and to cause selective cell apoptosis in human cervical carcinoma and in human malignant melanoma was seen with the three most active compounds of the prepared series of compounds. Tryptamine amide of (3β)-3-(acetyloxy)olean-12-en-28-oic acid (3a) exhibited cytotoxicity in HeLa cancer cell lines (IC50 = 8.7 ± 0.4 µM) and in G-361 cancer cell lines (IC50 = 9.0 ± 0.4 µM). Fluorotryptamine amides of (3β)-3-(acetyloxy)olean-12-en-28-oic acid (compounds 3b and 3c) showed cytotoxicity in the HeLa cancer cell line (IC50 = 6.7 ± 0.4 µM and 12.2 ± 4.7 µM, respectively). The fluorotryptamine amide of oleanolic acid (compound 4c) displayed cytotoxicity in the MCF7 cancer cell line (IC50 = 13.5 ± 3.3 µM). Based on the preliminary UV spectra measured in methanol/water mixtures, the compounds 3a-3c were also found to self-assemble into supramolecular systems. Conclusions: An effect of the fluorine atom present in the molecules on self-assembly was observed with 3b. Enhanced cytotoxicity has been achieved in 3a-4c in comparison with the effect of the parent oleanolic acid (1) and tryptamine. The compounds 3a-3c showed a strong induction of apoptosis in HeLa and G-361 cells after 24 h.

Department of Chemistry of Natural Compounds University of Chemistry and Technology Prague Technická 5 CZ 16628 Prague Czech Republic

Department of Experimental Biology Faculty of Science Palacký University Šlechtitelů 27 CZ 78371 Olomouc Czech Republic

Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo náměstí 2 CZ 16610 Prague Czech Republic

Isotope Laboratory Institute of Experimental Botany of the Czech Academy of Sciences Vídeňská 1083 CZ 14220 Prague Czech Republic

Laboratory of Growth Regulators Institute of Experimental Botany of the Czech Academy of Sciences Faculty of Science Palacký University Šlechtitelů 27 CZ 78371 Olomouc Czech Republic

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