Erschienen in:
09.08.2016 | Original Paper
Global or Granulosa Cell-Specific Pten Mutations in Combination with Elevated FSH Levels Fail to Cause Ovarian Tumours in Mice
verfasst von:
Dannielle H. Upton, Kirsty A. Walters, Rachel E. Allavena, Mark Jimenez, Reena Desai, David J. Handelsman, Charles M. Allan
Erschienen in:
Discover Oncology
|
Ausgabe 5-6/2016
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Abstract
Phosphatase and tensin homologue (PTEN) is a known tumour suppressor. To explore the role of Pten in ovarian tumorigenesis, we used transgenic (Tg) SOX2. Cre and AMH. Cre mouse models to direct global Pten haploinsufficiency (Pten
+/−) or ovary-specific granulosa cell (GC) Pten disruption (Pten
GC
). Pten mutant models were combined with progressively rising Tg-follicle-stimulating hormone (TgFSH) levels to study the tumorigenic potential of combined genetic/endocrine modification in vivo. Global Pten
+/− mice exhibited grossly detectable tumours in multiple organs including uterine and mammary tissue and displayed reduced survival. Despite extra-ovarian tumorigenesis, Pten
+/− females had no detectable ovarian tumours, although elevated corpus luteum numbers increased ovary size and estrous cycling was altered. Combined TgFSH/Pten
+/−
mice also had no ovarian tumours, but early survival was reduced in the presence of TgFSH. Ovary-specific Pten
GC
± TgFSH females exhibited no detectable ovarian or uterine tumours, and corpus luteum numbers and estrous cycling remained unchanged. The non-tumorigenic ovarian phenotypes in Pten
+/−
and Pten
GC
± TgFSH mice support the proposal that multi-hit genetic mutations (including ovarian and extra-ovarian tissue) initiate ovarian tumours. Our findings suggest that elevated FSH may reduce early cancer survival; however, the ovary remains remarkably resistant to Pten-induced tumorigenic changes even in the presence of uterine and reproductive cancers.