TY - JOUR T1 - Centrosome Impairments and Consequent Cytokinesis Defects are Possible Mechanisms of Taxane Drugs JF - Anticancer Research JO - Anticancer Res SP - 1919 LP - 1925 VL - 25 IS - 3B AU - JUN ZHU AU - ERIC C. BEATTIE AU - YANG YANG AU - HUI-JUAN WANG AU - JAE-YOUNG SEO AU - LI-XI YANG Y1 - 2005/05/01 UR - http://ar.iiarjournals.org/content/25/3B/1919.abstract N2 - Taxol and taxotere are two of the most promising anticancer drugs. To determine the mechanisms responsible for cell death after exposure to low doses of taxane, PC3 cells were treated with taxol and taxotere, and observed with immunofluoroscence microscopy. Pericentriolar material dissociation and blockage of normal centrosome separation were found to result in two different abnormal spindle types; multipolar and monopolar spindles, respectively. The majority of abnormal spindles induced by taxol were monopolar spindles, whereas taxotere mostly induced abnormal multipolar spindles. Consequently, monopolar spindle mitosis resulted in cleavage failure, while multipolar spindle mitosis led to the formation of both cleavage failure and multipolar cell division. Multinucleation characterized interphase cells which had undergone cytokinesis defects. These cells subsequently became giant multinucleated cells after several rounds of cell cycle with sustained cleavage failure, and were gradually eliminated through cell death. Copyright© 2005 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved ER -