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Inducible Expression of p57KIP2 Inhibits Glioma Cell Motility and Invasion

  • Laboratory Investigation
  • Published:
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Abstract

To examine the role of p57KIP2 in human malignant glioma cells, we studied its expression in a panel of human malignant glioma specimens by western blot and immunohistochemical analysis. To determine the effects of p57KIP2 expression on the phenotype of glioma cells, we analyzed two inducible stably transfected p57KIP2 expressing glioma cell lines. Expression of p57KIP2 was induced in U373 and U87 malignant gliomacells with doxycycline using the tetracycline repressor system. A phagokinetic track assay on gold particles was used to investigate differences in cell migration between p57KIP2 expressing and non-expressing control cells. The effects of the extracellular matrix (ECM) on U373 motility was determined in p57+ and p57 cells on surfaces coated with 5 μg/cm2 of fibronectin, laminin, type I and type IV collagens. The invasion of p57+ and p57 glioma cells across BD Biocoat Matrigel invasion chambers was then determined. p57KIP2 was weakly expressed in 4/6 glioblastoma (GBM) specimens by western blot. By immunohistochemistry, p57KIP2 immunoreactivity was positive in 8/40 GBMs, and was primarily nuclear in location. The motility of U373 glioma cells was significantly reduced after p57KIP2 induction. The presence of ECM proteins did not further alter the motility of p57+ and p57 glioma cells. The results of the invasion chamber assay showed that p57+ cells exhibited a 35% reduction in their invasive capacity as compared to p57 cells. These data suggest that p57KIP2 is expressed in at least some malignant gliomas. Inducible expression of 57KIP2 in cell lines deficient in this cyclin-dependent kinase inhibitor reduces their motility and invasiveness.

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Sakai, K., Peraud, A., Mainprize, T. et al. Inducible Expression of p57KIP2 Inhibits Glioma Cell Motility and Invasion. J Neurooncol 68, 217–223 (2004). https://doi.org/10.1023/B:NEON.0000033380.08940.c8

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  • DOI: https://doi.org/10.1023/B:NEON.0000033380.08940.c8

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