Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate.

Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Research Abstract Details 

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Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Abstract Text:

Anasuya Ray,Tatiana Okouneva,Tapas Manna,Herbert P Miller,Steven Schmid,Larry Arthaud,Richard Luduena,Mary Ann Jordan,Leslie Wilson,

Tasidotin (ILX-651), an orally active synthetic microtubule-targeted derivative of the marine depsipeptide dolastatin-15, is currently undergoing clinical evaluation for cancer treatment. Tasidotin inhibited proliferation of MCF7/GFP breast cancer cells with an IC(50) of 63 nmol/L and inhibited mitosis with an IC(50) of 72 nmol/L in the absence of detectable effects on spindle microtubule polymer mass. Tasidotin inhibited the polymerization of purified tubulin into microtubules weakly (IC(50) approximately 30 micromol/L). However, it strongly suppressed the dynamic instability behavior of the microtubules at their plus ends at concentrations approximately 5 to 10 times below those required to inhibit polymerization. Its major actions were to reduce the shortening rate, the switching frequency from growth to shortening (catastrophe frequency), and the fraction of time the microtubules grew. In contrast with all other microtubule-targeted drugs thus far examined that can inhibit polymerization, tasidotin did not inhibit the growth rate. In contrast to stabilizing plus ends, tasidotin enhanced microtubule dynamic instability at minus ends, increasing the shortening length, the fraction of time the microtubules shortened, and the catastrophe frequency and reducing the rescue frequency. Tasidotin C-carboxylate, the major intracellular metabolite of tasidotin, altered dynamic instability of purified microtubules in a qualitatively similar manner to tasidotin but was 10 to 30 times more potent. The results suggest that the principal mechanism by which tasidotin inhibits cell proliferation is by suppressing spindle microtubule dynamics. Tasidotin may be a relatively weak prodrug for the functionally active tasidotin C-carboxylate.

Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Publishing Authors By Initials

A Ray,T Okouneva,T Manna,HP Miller,S Schmid,L Arthaud,R Luduena,MA Jordan,L Wilson,

For similar pharmaceutical preparations: prodrugs research abstracts see: pharmaceutical preparations: prodrugs research

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Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Cancer research

VOLUME: 67

Page Numbers: 3767-76

Journal Abbreviation:

ISSN: 0008-5472

DAY: 15

MONTH: Apr

YEAR: 2007

Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 2984705

Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Keywords Mesh Terms:

KEYWORDS: Prodrugs

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate. Information

Substance Name: tasidotin

Registry Number: 0

Grant and Affiliation Information for Mechanism of action of the microtubule-targeted antimitotic depsipeptide tasidotin (formerly ILX651) and its major metabolite tasidotin C-carboxylate.

AFFILIATION: Department of Molecular, Cellular, and Developmental Biology and the Neuroscience Research Institute, University of California-Santa Barbara, Santa Barbara, CA 93106, USA.

Country: United States

AGENCY: United States NINDS

GRANT: NS 13560

ACRONYM: NS

MEDLINETA: Cancer Res

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