Antitumor Antimitotics That Reverse Tumor Resistance
Principal Investigator: A Gangjee
Affiliation: Duquesne University
Abstract: [unreadable] DESCRIPTION (provided by applicant): Antimitotic agents that target tubulin and mitosis are some of the most clinically successful antitumor agents. The Vinca alkaloids vincristine and vinblastine as well as Taxol and the taxanes are antitubulin agents used against a wide variety of tumors including leukemias, Hodgkin's, lymphomas (Vinca alkaloids) and breast, ovarian and other solid tumors (Taxol and taxanes). Recent evidence suggests that combinations of some antitubulin agents are synergistic and clinical trials are currently underway with such combinations. Clinical tumor resistance however is a major cause of treatment failure and is most often the result of P-glycoprotein which pumps the antitumor agent out of the tumor cells. Thus novel antimitotic agents that are active against resistant tumors are highly coveted. We have recently discovered a series of analogs that are quite novel in that they possess antimitotic and antitumor activities in the nanomolar range against antimitotic sensitive as well as resistant tumor cells, they bind to a site on tubulin that is different from the colchicine, vinca alkaloid and Taxol sites, and remarkably also reverse tumor resistance to antimitotic agents. The Specific Aims of this proposal are: 1) the synthesis of analogs of the lead compounds to provide a structure-activity relationship (SAR) study to optimize both the antitumor activity as well as the ability to reverse tumor resistance to antimitotic agents; 2) evaluation of the microtubule and cell cycle effects of these compounds; 3) evaluation of the cytotoxicity both as single agents and in combination, and the anti-multidrug resistance activities of these compounds; and 4) evaluation of the in vivo antitumor activity of the lead compounds and selected analogs against both antimitotic sensitive and resistant tumors. This study should provide a comprehensive SAR for the design of future analogs and afford analogs with increased antitumor activity against sensitive and resistant tumors in vitro and in vivo as well as an increased ability to reverse tumor resistance perhaps in single agents. Such agents could be used alone or in combination with other antimitotic or antitumor agents and provide a broader spectrum of activity against both antimitotic sensitive and resistant tumors. The study will also further define the mechanism of action of the novel series and could afford agents for clinical use. [unreadable] [unreadable]
Funding Period: 2006-02-24 - 2010-12-31
more information: NIH RePORT
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Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
Bioorg Med Chem 21:1180-9. 2013..Incorporation of methoxy substitutions on the 7-benzyl moiety improved antitumor activity for the 5-phenylthio compounds 16 and 17. Compounds 16 and 17 demonstrated single to two-digit micromolar inhibition of tumor cells...
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Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA
J Med Chem 54:6151-5. 2011..Cytotoxicity against 60 tumor cell lines, however, indicated that the (S)-isomer was 10- to 88-fold more potent than the (R)-isomer...
- Discovery of novel antitumor antimitotic agents that also reverse tumor resistanceAleem Gangjee
Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, USA
J Med Chem 50:3290-301. 2007..Compounds of this series are promising novel antimitotic agents that have the potential for treating both sensitive and resistant tumors...