Rigid Analogues of Antimitotic Indolobenzazepinones: New Insights into Tubulin Binding via Molecular Modeling
摘要:
Two rigid analogues of 5-ethylindolobenzazepinone 4, a potent c-ytotoxic agent and inhibitor of tubulin polymerization, were prepared. The first was the indane derivative 5, in which the ethyl group is attached to the benzo moiety. The second was the pyrrolidine analogue 6, in which the ethyl chain was bound to the lactam nitrogen. While both compounds were considerably less active inhibitors of KB cell growth as compared to 4, inhibition of tubulin polymerization was only moderately reduced. Tubulin docking studies indicated that the aR and aS atropoisomers of 5 and 6 occupy different binding pockets at the colchicine binding site. Conversely, both aS-5 and aS-6 occupy the same binding pocket as aSS-4 but do not benefit from the favorable hydrophobic interactions provided by the CS alkyl group of 4, thus possibly explaining their lower activities.
New C5-Alkylated Indolobenzazepinones Acting as Inhibitors of Tubulin Polymerization: Cytotoxic and Antitumor Activities
作者:Laurent Keller、Stéphane Beaumont、Jian-Miao Liu、Sylviane Thoret、Jérôme S. Bignon、Joanna Wdzieczak-Bakala、Philippe Dauban、Robert H. Dodd
DOI:10.1021/jm701466p
日期:2008.6.1
A series of 5-alkylindolobenzazepin-7-ones was synthesized by Suzuki coupling between 3-iodoindole-2-carboxylates and the appropriate alpha-alkylbenzylamino o-boronic acids followed by cyclization to the lactam. Derivatives having a linear alkyl chain at C5 were found to be highly cytotoxic to KB cells with IC50 values in the 30-80 nM range. These compounds also inhibited the polymerization of tubulin with IC50's of 1-2 mu M. Compound 4f ((S)-5-ethyl) showed comparable antiproliferative activities (IC50's of 30-70 nM) in a variety of cancer cell lines, cell growth being arrested at the G2/M phase. Compound 4f induced apoptosis in a dose-dependent manner in three different cancer cell lines and was shown to affect cell morphology in a manner consistent with its inhibitory action on tubulin polymerization. Using the experimental model of glioma grafted on the chick chorio-allantoic membrane, local treatment with compound 4f markedly reduced tumor progression.
[EN] NOVEL WATER-SOLUBLE INDOLOBENZAZEPINE MOLECULES DEMONSTRATING ANTIMITOTIC, ANTIVASCULAR, AND ANTITUMOR ACTIVITIES IN VIVO<br/>[FR] NOUVELLES MOLECULES INDOLOBENZAZEPINIQUES HYDROSOLUBLES DEMONTRANT DES ACTIVITES ANTIMITOTIQUES, ANTIVASCULAIRES ET ANTITUMORALES IN VIVO
申请人:CENTRE NAT RECH SCIENT
公开号:WO2012059568A1
公开(公告)日:2012-05-10
L'objet de la présente demande de brevet concerne des dérivés indolobenzazépiniques à activité antitumorale, leur synthèse, et leur utilisation. En particulier, l'objet de la présente demande de brevet concerne une synthèse stéréocontrôlée de indolobenzazépinones substitués en C5 permettant d'obtenir uniquement l'un ou l'autre des deux isomères possibles en C5 ainsi que des analogues hydrosolubles permettant de démontrer la très grande efficacité de ces molécules à diminuer in vivo la taille de tumeurs.