Development of Microtubulin Inhibitor Is a Potential Lead to Novel Biologic Therapy

Gatastatin, an inhibitor specific for γ-tubulin, known to be overexpressed in some cancer cells, has been identified and holds potential for the development of anticancer agents. These findings were published in Nature Communications (doi:10.1038/ncomms9722).

Cancer therapy and biologic research regularly uses inhibitors of microtubule assembly that target α/β-tubulin. However, none had been identified for γ-tubulin, which is known to activate during cell division and to be overexpressed in some cancer cells.

The γ-tubulin specific inhibitor gatastatin was developed through a collaboration between Takeo Usui, PhD, and Hideo Kigoshi, PhD, both at the University of Tsukuba in Tsukuba, Japan, and Heidelberg University, Okayama University, Tokyo University of Pharmacy and Life Sciences, and RIKEN. These researchers evolved previously developed inhibitors of β-tubulin to create gatastatin.

Their study using gatastatin found that γ-tubulin function is important in microtubule function in the late stages of cell division. Microtubules are very involved in shaping and dividing cells during cell division. When gatastatin was added to preformed metaphase spindles, the dynamics of microtubules were altered, the number of growing microtubules was reduced, and spindle lengths were shortened. So, gatastatin revealed novel roles for γ-tubulin in maintaining the metaphase spindle and elongating the anaphase spindle. These are important steps in cell division.

Gatastatin was found to block γ-tubulin–dependent microtubule nucleation without affecting the polymerization of α/β-tubulin. During the cell cycle, γ-tubulin has continuous importance. The results of these studies provide knowledge linking to analyses of intracellular γ-tubulin function as well as the development of new anticancer agents.

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