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Loss of PI3K blocks cell-cycle progression in a Drosophila tumor model.

Summary of "Loss of PI3K blocks cell-cycle progression in a Drosophila tumor model."

Tumorigenesis is a complex process, which requires alterations in several tumor suppressor or oncogenes. Here, we use a Drosophila tumor model to identify genes, which are specifically required for tumor growth. We found that reduction of phosphoinositide 3-kinase (PI3K) activity resulted in very small tumors while only slightly affecting growth of wild-type tissue. The observed inhibition on tumor growth occurred at the level of cell-cycle progression. We conclude that tumor cells become dependent on PI3K function and that reduction of PI3K activity synthetically interferes with tumor growth. The results presented here broaden our insights into the intricate mechanisms underling tumorigenesis and illustrate the power of Drosophila genetics in revealing weak points of tumor progression.Oncogene advance online publication, 25 April 2011; doi:10.1038/onc.2011.125.

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Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland.

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This article was published in the following journal.

Name: Oncogene
ISSN: 1476-5594
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Medical and Biotech [MESH] Definitions

Proteins whose abnormal expression (gain or loss) are associated with the development, growth, or progression of NEOPLASMS. Some neoplasm proteins are tumor antigens (ANTIGENS, NEOPLASM), i.e. they induce an immune reaction to their tumor. Many neoplasm proteins have been characterized and are used as tumor markers (TUMOR MARKERS, BIOLOGICAL) when they are detectable in cells and body fluids as monitors for the presence or growth of tumors. Abnormal expression of ONCOGENE PROTEINS is involved in neoplastic transformation, whereas the loss of expression of TUMOR SUPPRESSOR PROTEINS is involved with the loss of growth control and progression of the neoplasm.

A guanine nucleotide exchange factor from DROSOPHILA. Sevenless refers to genetic mutations in DROSOPHILA that cause loss of the R7 photoreceptor which is required to see UV light.

A group of cell cycle proteins that negatively regulate the activity of CYCLIN/CYCLIN-DEPENDENT KINASE complexes. They inhibit CELL CYCLE progression and help control CELL PROLIFERATION following GENOTOXIC STRESS as well as during CELL DIFFERENTIATION.

The period of the CELL CYCLE preceding DNA REPLICATION in S PHASE. Subphases of G1 include "competence" (to respond to growth factors), G1a (entry into G1), G1b (progression), and G1c (assembly). Progression through the G1 subphases is effected by limiting growth factors, nutrients, or inhibitors.

A class of RAS GUANINE NUCLEOTIDE EXCHANGE FACTORS that are genetically related to the Son of Sevenless gene from DROSOPHILA. Sevenless refers to genetic mutations in DROSOPHILA that cause loss of the R7 photoreceptor which is required to see UV light.

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