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Germ cell tumors overexpress the candidate therapeutic target cyclin B1 independently of p53 function

Ugo De Giorgi1, Juping Yuan, Mauro Moroni

  • 1Department of Medical Oncology, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, Meldola (Forlì-Cesena) - Italy.

The International Journal of Biological Markers
|May 19, 2015
PubMed

Insights

Germ cell tumors (GCTs) consistently overexpress cyclin B1, regardless of chemotherapy resistance or p53 mutations. Targeting cyclin B1 may offer a novel therapeutic strategy for GCTs.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Germ cell tumors (GCTs) typically express wild-type p53.
  • p53 mutations are rare in GCTs and may correlate with cisplatin resistance.
  • Cyclins, particularly cyclin B1, are emerging as potential therapeutic targets in GCTs.

Purpose of the Study:

  • To investigate if chemotherapy-resistant GCTs overexpress cyclin B1 due to nonfunctional p53.
  • To evaluate cyclin B1 as a potential therapeutic target in GCTs.

Main Methods:

  • Analysis of cyclin B1 expression in GCT cell lines.
  • Assessment of p53 status (wild-type vs. mutated).
  • Evaluation of the effect of cyclin B1-specific small interfering RNAs (siRNAs) on tumor cell proliferation.

Main Results:

  • GCTs consistently overexpressed cyclin B1, irrespective of chemotherapy response or p53 mutation status.
  • Cyclin B1 overexpression was observed even in GCT cell lines with functional p53.
  • Cyclin B1-specific siRNAs showed only a minor reduction in the proliferation of JAR and JEG-3 cells.

Conclusions:

  • Cyclin B1 overexpression is a common feature of GCTs, independent of p53 status or chemotherapy sensitivity.
  • The role of cyclin B1 as a therapeutic target in GCTs requires further investigation, as its inhibition had limited impact on proliferation in tested cell lines.

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