Induction of apoptosis is a promising strategy that could lead to the discovery of new molecules active in cancer chemotherapy. This property is generally observed when cells are treated with agents that target microtubules, dynamic structures that play a crucial role in cell division. Small molecules such as benzo[b]furans are attractive as inhibitors of tubulin polymerization. A new class of inhibitors of tubulin polymerization based on the 2-(3',4',5'-trimethoxybenzoyl)benzo[b]furan molecular skeleton, with the amino group placed at different positions on the benzene ring, were synthesized and evaluated for antiproliferative activity, inhibition of tubulin polymerization, and cell-cycle effects. The methoxy substitution pattern on the benzene portion of the benzo[b]furan moiety played an important role in affecting antiproliferative activity. In the series of 5-amino derivatives, the greatest inhibition of cell growth occurred if the methoxy substituent is placed at the C6 position, whereas C7 substitution decreases potency. The most promising compound in this series is 2-(3',4',5'-trimethoxybenzoyl)-3-methyl-5-amino-6-methoxybenzo[b]furan (3h), which inhibits cancer cell growth at nanomolar concentrations (IC 50=16-24nM), and interacts strongly with tubulin by binding to the colchicine site. Sub-G 1 apoptotic cells in cultures of HL-60 and U937 cells were observed by flow cytometric analysis after treatment with 3h in a concentration-dependent manner. We also show that compound 3h induces apoptosis by activation of caspase-3, -8, and -9, and this is associated with cytochromec release from mitochondria. The introduction of an α-bromoacryloyl group increased antiproliferative activity with respect to the parent amino derivatives. A new class of tubulin polymerization inhibitors based on the 2-(3,4,5-trimethoxybenzoyl)benzo[b]furan molecular skeleton, with the amino group placed at various positions on the benzene ring, were synthesized. The most promising compound in this series, 3h, inhibits cancer cell growth at nanomolar concentrations and interacts strongly with tubulin by binding to the colchicine site. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Synthesis and Antitumor Molecular Mechanism of Agents Based on Amino 2-(3 ',4 ',5 '-Trimethoxybenzoyl)benzo[b]furan: Inhibition of Tubulin and Induction of Apoptosis
ROMAGNOLI, Romeo;BARALDI, Pier Giovanni;
2011
Abstract
Induction of apoptosis is a promising strategy that could lead to the discovery of new molecules active in cancer chemotherapy. This property is generally observed when cells are treated with agents that target microtubules, dynamic structures that play a crucial role in cell division. Small molecules such as benzo[b]furans are attractive as inhibitors of tubulin polymerization. A new class of inhibitors of tubulin polymerization based on the 2-(3',4',5'-trimethoxybenzoyl)benzo[b]furan molecular skeleton, with the amino group placed at different positions on the benzene ring, were synthesized and evaluated for antiproliferative activity, inhibition of tubulin polymerization, and cell-cycle effects. The methoxy substitution pattern on the benzene portion of the benzo[b]furan moiety played an important role in affecting antiproliferative activity. In the series of 5-amino derivatives, the greatest inhibition of cell growth occurred if the methoxy substituent is placed at the C6 position, whereas C7 substitution decreases potency. The most promising compound in this series is 2-(3',4',5'-trimethoxybenzoyl)-3-methyl-5-amino-6-methoxybenzo[b]furan (3h), which inhibits cancer cell growth at nanomolar concentrations (IC 50=16-24nM), and interacts strongly with tubulin by binding to the colchicine site. Sub-G 1 apoptotic cells in cultures of HL-60 and U937 cells were observed by flow cytometric analysis after treatment with 3h in a concentration-dependent manner. We also show that compound 3h induces apoptosis by activation of caspase-3, -8, and -9, and this is associated with cytochromec release from mitochondria. The introduction of an α-bromoacryloyl group increased antiproliferative activity with respect to the parent amino derivatives. A new class of tubulin polymerization inhibitors based on the 2-(3,4,5-trimethoxybenzoyl)benzo[b]furan molecular skeleton, with the amino group placed at various positions on the benzene ring, were synthesized. The most promising compound in this series, 3h, inhibits cancer cell growth at nanomolar concentrations and interacts strongly with tubulin by binding to the colchicine site. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
