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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Cyclin-dependent kinase inhibitor indirubin-3'-oxime selectively inhibits human papillomavirus type 16 E7-induced numerical centrosome anomalies.

Dysregulation of the centrosome duplication cycle has been implicated in tumorigenesis. Our previous work has shown that the human papillomavirus type 16 (HPV-16) E7 oncoprotein rapidly induces aberrant centrosome and centriole duplication in normal human cells. We report here that HPV E7-induced abnormal centriole duplication is specifically abrogated by a small molecule CDK inhibitor, indirubin-3'-oxime (IO), but not a kinase-inactive derivative. Importantly, normal centriole duplication was not markedly affected by IO, and the inhibitory effects were observed at concentrations that did not affect the G1/S transition of the cell division cycle. Depletion of CDK2 by siRNA similarly abrogated HPV E7- induced abnormal centrosome duplication and ectopic expression of CDK2 in combination with cyclin E or cyclin A could rescue the inhibitory effect of IO. IO treatment also reduced the steady-state level of aneuploid cells in HPV-16 E7-expressing cell populations. Our results suggest that cyclin/CDK2 activity is critically involved in abnormal centrosome duplication induced by HPV-16 E7 oncoprotein expression, but may be dispensable for normal centrosome duplication and cell cycle progression.[1]

References

  1. Cyclin-dependent kinase inhibitor indirubin-3'-oxime selectively inhibits human papillomavirus type 16 E7-induced numerical centrosome anomalies. Duensing, S., Duensing, A., Lee, D.C., Edwards, K.M., Piboonniyom, S.O., Manuel, E., Skaltsounis, L., Meijer, L., Münger, K. Oncogene (2004) [Pubmed]
 
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