Picolyl amides of betulinic acid as antitumor agents causing tumor cell apoptosis

• DOI: 10.1016/j.ejmech.2017.12.096
• Publication Date: 2018-01-04T18:24:38Z
• Authors: Uladzimir Bildziu...; Lucie Rárová; David Šaman; Zdeněk Wimmer
• Keywords: Amide; 0301 basic medicine; Dose-Response Relationship, Drug; Molecular Structure; Cytotoxicity; Antineoplastic Agents; Apoptosis; Betulinic acid; Picolyl amine; Amides; Triterpenes; Cell Line; 3. Good health; Structure-Activity Relationship; 03 medical and health sciences; Humans; Drug Screening Assays, Antitumor; Betulinic Acid; Pentacyclic Triterpenes; Therapeutic index; Cell Proliferation

A series of picolyl amides of betulinic acid (3a-3c and 6a-6c) was prepared and subjected to the cytotoxicity screening tests. Structure-activity relationships studies resulted in finding differences in biological activity in dependence on o-, m- and p-substitution of the pyridine ring in the target amides, when cytotoxicity data of 3a-3c and 6a-6c were obtained and compared. The amides 3b and 3a displayed cytotoxicity (given in the IC50 values) in G-361 (0.5 ± 0.1 μM and 2.4 ± 0.0 μM, respectively), MCF7 (1.4 ± 0.1 μM and 2.2 ± 0.2 μM, respectively), HeLa (2.4 ± 0.4 μM and 2.3 ± 0.5 μM, respectively) and CEM (6.5 ± 1.5 μM and 6.9 ± 0.4 μM, respectively) tumor cell lines, and showed weak effect in the normal human fibroblasts (BJ). Selectivity against all tested cancer cells was determined and compared to normal cells with therapeutic index (TI) between 7 and 100 for compounds 3a and 3b. The therapeutic index (TI = 100) was calculated for human malignant melanoma cell line (G-361) versus normal human fibroblasts (BJ). The cytotoxicity of other target amides (3c and 6a-6c) revealed lower effects than 3a and 3b in the tested cancer cell lines.