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Mechanism of mitotic arrest induced by dolastatin 15 involves loss of tension across kinetochore pairs

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Abstract

Dolastatin 15 (DL15) is a potent, tubulin-targeted, vinca-site binding, anticancer agent that induces mitotic arrest and inhibit cell proliferation in a variety of cell types. Several analogs of DL15, including LU 103793 and tasidotin, have been progressed to clinical trials for different types of cancer. DL15 has been known to interfere with cellular microtubules and purified tubulin in vitro. However, the molecular mechanism with which the peptide arrests cells in mitosis is poorly understood. This study reports a possible antimitotic mechanism of action of DL15. DL15 inhibited HeLa cell proliferation in a concentration-dependent manner with a half-maximal inhibitory concentration (IC50) of 2.8 ± 0.3 nM, induced mitotic arrest, disrupted cellular microtubules near its IC50 for cell proliferation, and inhibited the re-polymerization of cellular microtubules. By staining the centrosomes of DL15-treated cells with anti-γ tubulin antibodies, the study found a significant reduction in interpolar distances in mitotic HeLa cells, indicating a disruption in the normal assembly dynamics of the microtubules. The study further found that DL15 induced a loss of tension across the kinetochore pairs as indicated by a reduction in interkinetochore distance. In response to this loss of tension, the tension-sensing checkpoint protein BuBR1 accumulated at the kinetochores, promoting mitotic arrest. In vitro, DL15 promoted formation of curved and fragmented polymers of microtubule proteins and inhibited tubulin decay in a manner similar to vinca-site binding agents such as phomopsin A. Together, the data indicate that the mitotic arrest induced by DL15 involves a loss of tension across the kinetochore pairs due to disruption of normal assembly dynamics of microtubules.

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Acknowledgments

The author thanks Prof. Dulal Panda, Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, for providing the facilities for carrying out this research and for helpful suggestions, and Silja Joseph, University of California, Santa Barbara, for critical reading of the manuscript.

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  1. Manu Lopus

    Present address: Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, University of California, Santa Barbara, CA, 93106, USA

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  1. Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai, India

    Manu Lopus

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Lopus, M. Mechanism of mitotic arrest induced by dolastatin 15 involves loss of tension across kinetochore pairs. Mol Cell Biochem 382, 93–102 (2013). https://doi.org/10.1007/s11010-013-1721-8

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