Perturbation of the chromosomal binding of RCC1, Mad2 and survivin causes spindle assembly defects and mitotic catastrophe

Journal of Cellular Biochemistry
Chin-Yee HoHoi-Yeung Li

Abstract

Mitotic catastrophe is a form of cell death that results from aberrant mitosis. Currently, the mechanisms involved in this form of cell death remain poorly understood. We found that actinomycin D induces mitotic catastrophe with severe spindle assembly defects. We have studied the nature of three groups of chromosome binding proteins in mitotic cells treated with actinomycin D. We found that actinomycin D reduced the binding affinity of RCC1 to the mitotic chromosome, which led to a reduction of RanGTP level. In addition, Mad2 was not concentrated at the kinetochores, indicating that the mitotic spindle checkpoint was affected. Furthermore, the localization of survivin was altered in cells. These data suggested that chromosomal binding of the mitotic regulators such as RCC1, Mad2 and survivin is essential for mitotic progression. Mitotic chromosomes not only carry the genetic material needed for the newly synthesized daughter cells, but also serve as docking sites for some of the mitotic regulators. Perturbation of their binding to the mitotic chromosome by actinomycin D could affect their functions in regulating mitotic progression thus leading to severe spindle defects and mitotic catastrophe.

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Citations

Feb 25, 2014·Apoptosis : an International Journal on Programmed Cell Death·Sanjeev ShuklaSanjay Gupta
Jun 1, 2010·Journal of Cellular Biochemistry·Chin-Yee Ho, Hoi-Yeung Li
Oct 1, 2015·Assay and Drug Development Technologies·Tony J CollinsDavid W Andrews
Dec 17, 2014·Nature Structural & Molecular Biology·Maximiliano M PortalHinrich Gronemeyer
May 25, 2013·World Journal of Gastroenterology : WJG·Wei SunYou-Yong Lu

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