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Advances in Brief

Overexpression of CDC25A and CDC25B in Head and Neck Cancers

Daniela Gasparotto, Roberta Maestro, Sara Piccinin, Tamara Vukosavljevic, Luigi Barzan, Sandro Sulfaro and Mauro Boiocchi
Daniela Gasparotto
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Roberta Maestro
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Sara Piccinin
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Tamara Vukosavljevic
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Luigi Barzan
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Sandro Sulfaro
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Mauro Boiocchi
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DOI:  Published June 1997
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Abstract

The deregulation of several cell cycle-related genes participates in neoplastic transformation. Cell cycle progression is driven by cyclin-dependent kinases, which are positively regulated by association with cyclins and negatively regulated by binding to inhibitory subunits. The activity of cyclin-dependent kinases is also regulated by the phosphorylation status, which is controlled by the antagonistic action of weel kinase and CDC25 phosphatases. Three CDC25 genes are present in human cells: CDC25A, CDC25B, and CDC25C. These three genes function at different phases of the cell cycle. Whereas CDC25A and CDC25B are expressed throughout the cell cycle, with peak expression in G1 for CDC25A and in both G1-S-phase and G2 for CDC25B, CDC25C is predominantly expressed in G2. Several lines of evidence suggest a role for CDC25s as oncogenes. CDC25A and CDC25B cooperate with Ha-ras or loss of Rb1 in the oncogenic transformation of rodent fibroblasts. Moreover, they are transcriptional targets of c-myc, and CDC25A in particular plays an important role as a mediator of myc functions. On the basis of the evidence that CDC25 phosphatases can act as oncogenes, we analyzed the expression of CDC25A, CDC25B, and CDC25C genes in 20 squamous cell carcinomas of the head and neck by quantitative reverse transcription-PCR. Our results show that whereas CDC25C is expressed at a low level with no relevant differences between neoplastic tissue and normal mucosa, CDC25A and CDC25B are overexpressed in a large fraction of tumors.

Footnotes

  • ↵1 Supported in part by a grant from the Italian Association for Cancer Research.

  • ↵2 To whom requests for reprints should be addressed.

  • Received March 18, 1997.
  • Accepted April 30, 1997.
  • ©1997 American Association for Cancer Research.
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June 1997
Volume 57, Issue 12
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Overexpression of CDC25A and CDC25B in Head and Neck Cancers
Daniela Gasparotto, Roberta Maestro, Sara Piccinin, Tamara Vukosavljevic, Luigi Barzan, Sandro Sulfaro and Mauro Boiocchi
Cancer Res June 15 1997 (57) (12) 2366-2368;

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Overexpression of CDC25A and CDC25B in Head and Neck Cancers
Daniela Gasparotto, Roberta Maestro, Sara Piccinin, Tamara Vukosavljevic, Luigi Barzan, Sandro Sulfaro and Mauro Boiocchi
Cancer Res June 15 1997 (57) (12) 2366-2368;
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