vincristine-sulfate and Liver-Neoplasms

In our search for potential new anticancer drugs, we designed and synthesized a series of tricyclic compounds containing the antimitotic 2-phenylazaflavone chromophore fused to a pyrrole ring in a pyrroloquinoline structure. Compounds 8, 18, 19, 22, 23, 25 and 26, when tested against a panel of fourteen human tumor cell lines, showed poor in vitro cytotoxic activity, whereas 20, 21 and 24 showed significant activity (IC(50) 0.7 to 50 microM). Steroid hormone-sensitive ovary, liver, breast and adrenal gland adenocarcinoma cell lines displayed the highest sensitivity (IC(50) 0.7 to 8 microM). Compound 24 blocked cells in the G(2)/M phase of the cell cycle and induced a significant increase in apoptotis. Compounds 20, 21 and 24 proved to alter microtubule assembly and stability, displaying a cytoplasmic microtubule network similar to that caused by Vincristine. In vivo, administration of compound 24 to Balb/c mice inhibited the growth of a syngenic hepatocellular carcinoma.

Topics: Animals; Antineoplastic Agents; Apoptosis; Aromatase Inhibitors; Carcinoma, Hepatocellular; Cell Cycle; Cell Line, Tumor; Drug Screening Assays, Antitumor; Humans; Liver Neoplasms; Male; Mice; Mice, Inbred BALB C; Microtubules; Neoplasm Transplantation; Neoplasms, Hormone-Dependent; Pyrroles; Quinolines; Structure-Activity Relationship; Topoisomerase I Inhibitors; Topoisomerase II Inhibitors