Bone marrow CFU-GM and human tumor xenograft efficacy of three tubulin binding agents.

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Kurtzberg LS, Roth SD, Bagley RG, Rouleau C, Yao M, Crawford JL, Krumbholz RD, Schmid SM, Teicher BA

Bone marrow CFU-GM and human tumor xenograft efficacy of three tubulin binding agents.

Cancer Chemother Pharmacol. 2009 Oct;64(5):1029-38. doi: 10.1007/s00280-009-0959-z. Epub 2009 Mar 10.

PubMed ID

19277662 [ View in PubMed

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Abstract

PURPOSE: The dynamic instability of microtubules in cells is one of the key targets of anticancer therapeutics. Microtubule-disrupting agents such as vinca alkaloids and microtubule-stabilizing agents such as taxanes are important antitumor agents. The bone marrow toxicity and human tumor xenograft activity of three tubulin-binding compounds, vincristine, paclitaxel, and tasidotin were compared. METHODS: Mouse and human bone marrow were subjected to colony-forming (CFU-GM) assays over a 5-log concentration range in culture. In vivo, a range of tasidotin doses was compared with vincristine, paclitaxel, and docetaxel for efficacy in several human tumor xenografts. RESULTS: The IC(90) concentrations for vincristine and paclitaxel for mouse CFU-GM were 30 and 27 nM, and for human CFU-GM were 3 and 9 nM, giving mouse to human differentials of ten- and threefold. Tasidotin produced IC(90)s of >300 nM in mouse and 65 nM in human CFU-GM, thus a >4.6-fold differential between species. In vivo, tasidotin resulted in a dose-dependent increase in tumor growth delay in the RL lymphoma, the RPMI 8226 multiple myeloma, and MX-1 breast carcinoma models. Vincristine and tasidotin were also very effective against these tumors. The PC-3 prostate carcinoma was very responsive to full-dose paclitaxel and docetaxel while tasidotin generated a dose dependent effect. CONCLUSIONS: Bringing together bone marrow toxicity data, pharmacokinetic parameters, and human tumor xenograft efficacy provides valuable information for the translation of preclinical findings to the clinic.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Vincristine	Tubulin beta chain	Protein	Humans	Yes	Inhibitor	Details