Carcinogenesis, Vol. 21, No. 12, 2293-2297,
December 2000
© 2000 Oxford University Press
SHORT COMMUNICATION |
Correlation of defective mitotic checkpoint with aberrantly reduced expression of MAD2 protein in nasopharyngeal carcinoma cells
Department of Anatomy and
1 Institute of Molecular Biology, Faculty of Medicine, University of Hong Kong, Pok Fu Lam Road, Hong Kong
Nasopharyngeal carcinoma (NPC) occurs with a high incidence in many countries in south-eastern Asia. Chromosomal abnormalities have been commonly found in NPC, but the underlying mechanism is not well understood. We determined mitotic indices, the staining pattern of nuclear DNA and cell cycle profiles of NPC cells in response to treatment with microtubule-disrupting agents, and found that the mitotic checkpoint was defective in two out of five (40%) of the tested NPC cell lines. We also observed that an aberrantly reduced expression of MAD2, one of the key components of mitotic checkpoint, correlated with the loss of checkpoint control. Our findings suggest that a defective mitotic checkpoint characterized by reduced expression of MAD2 contributes to chromosomal instability in NPC.
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