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PLoS One. 2009;4(1):e4295. doi: 10.1371/journal.pone.0004295. Epub 2009 Jan 27.

Expression of activated PIK3CA in ovarian surface epithelium results in hyperplasia but not tumor formation.

Author information

1
Center for Research on the Early Detection and Cure of Ovarian Cancer, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America.

Abstract

BACKGROUND:

The Phosphatidylinositol 3'-kinase is a key regulator in various cancer-associated signal transduction pathways. Genetic alterations of its catalytic subunit alpha, PIK3CA, have been identified in ovarian cancer. Our in vivo data suggests that PIK3CA activation is one of the early genetic events in ovarian cancer. However, its role in malignant transformation of ovarian surface epithelium (OSE) is largely unclear.

METHODOLOGY/PRINCIPAL FINDINGS:

Using the Müllerian inhibiting substance type II receptor (MISIIR) promoter, we generated transgenic mice that expressed activated PIK3CA in the Müllerian epithelium. Overexpression of PIK3CA in OSE induced remarkable hyperplasia, but was not able to malignantly transform OSE in vivo. The consistent result was also observed in primary cultured OSEs. Although enforced expression of PIK3CA could not induce OSE anchorage-independent growth, it significantly increased anchorage-independent growth of OSE transformed by mutant K-ras.

CONCLUSIONS/SIGNIFICANCE:

While PIK3CA activation may not be able to initiate OSE transformation, we conclude that activation of PIK3CA may be an important molecular event contributing to the maintenance of OSE transformation initiated by oncogenes such as K-ras.

PMID:
19172191
PMCID:
PMC2629728
DOI:
10.1371/journal.pone.0004295
[Indexed for MEDLINE]
Free PMC Article

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