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Microtubules are dynamic structures that undergo cycles of catastrophe and rescue. The microtubules play a central role in cell division by forming the spindle apparatus for segregating the chromosomes. This makes them ideal targets for regulating dividing cells in tumors and malignant cancer cells. Microtubule stabilizing drugs help stabilize the microtubule formation and promote its polymerization. Paclitaxel was the first microtubule stabilizing agent used as anticancer drug in chemotherapy...
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Microtubules are dynamic structures and can be regulated by microtubule targeting agents (MTAs). Microtubule destabilizing drugs are a class of MTAs that destabilize and prevent microtubules' polymerization. Both natural and synthetic chemicals can be found under this class of drugs. Vincristine and vinblastine, two vinca alkaloids, and colchicine were among the first to be discovered. These drugs can affect cells in various ways, either by inducing a change in cell morphology, preventing...
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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Self-Assembly of Microtubule Tactoids
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Taccalonolide microtubule stabilizers.

Jing Li1, April L Risinger1, Susan L Mooberry2

  • 1Department of Pharmacology, University of Texas Health Science Center at San Antonio, TX 78229, United States; Cancer Therapy & Research Center, University of Texas Health Science Center at San Antonio, TX 78229, United States.

Bioorganic & Medicinal Chemistry
|February 5, 2014
PubMed
Summary

Taccalonolides, a novel class of microtubule stabilizers derived from Tacca plants, show unique efficacy against taxane-resistant cells. These compounds covalently bind to beta-tubulin, offering a promising new avenue for cancer therapy.

Keywords:
LaulimalideMicrotubuleMicrotubule stabilizerPaclitaxelTaccaTaccalonolideTaxolTubulin

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Area of Science:

  • Natural Products Chemistry
  • Cell Biology
  • Pharmacology

Background:

  • Taccalonolides are a new class of pentacyclic steroid natural products isolated from the Tacca genus.
  • They function as microtubule stabilizers, similar to established agents, but possess unique properties.

Purpose of the Study:

  • To review the properties and mechanisms of taccalonolides as microtubule stabilizers.
  • To highlight their potential as therapeutic agents, particularly in cases of drug resistance.

Main Methods:

  • Literature review of studies on taccalonolides.
  • Analysis of cell-based assays and in vivo models evaluating taccalonolide efficacy.
  • Review of biochemical binding studies elucidating the mechanism of action.

Main Results:

  • Taccalonolides increase microtubule density, induce bundling, and cause mitotic arrest leading to apoptosis.
  • They demonstrate efficacy in taxane-resistant cell lines and in vivo models.
  • Taccalonolide AJ exhibits covalent binding to beta-tubulin near the taxane binding site, stabilizing microtubules uniquely.

Conclusions:

  • Taccalonolides represent a distinct class of microtubule-targeting agents with a unique mechanism of action.
  • Their ability to overcome taxane resistance makes them promising candidates for cancer drug development.