Physiological expression of the PI3K-activating mutation Pik3ca(H1047R) combines with Apc loss to promote development of invasive intestinal adenocarcinomas in mice
AuthorHare, Lauren M.; Phesse, Toby J.; Waring, Paul M.; Montgomery, Karen G.; Kinross, Kathryn M.; Mills, Kevin; Roh, Vincent; Heath, Joan K.; Ramsay, Robert G.; Ernst, Matthias; ...
Source TitleBIOCHEMICAL JOURNAL
University of Melbourne Author/sPhesse, Toby; Waring, Paul; Heath, Joan; Ramsay, Rob; Ernst, Matthias; Phillips, Wayne
AffiliationSir Peter MacCallum Department of Oncology
Document TypeJournal Article
Access StatusOpen Access
NHMRC Grant codeNHMRC/628621
The fulltext of this publication will be made publicly available after relevant embargo periods have lapsed and associated copyright clearances obtained.
PIK3CA, the gene encoding the p110 alpha catalytic subunit of PI3K (phosphoinositide 3-kinase), is mutated in approximately 20% of sporadic CRCs (colorectal cancers), but the role of these mutations in the pathogenesis of CRC remains unclear. In the present study we used a novel mouse model to investigate the role of the Pik3ca(H1047R) mutation, the most common PIK3CA mutation in CRC, during the development and progression of intestinal cancer. Our results demonstrate that Pik3ca(H1047R), when expressed at physiological levels, is insufficient to initiate intestinal tumorigenesis; however, in the context of Apc (adenomatous polyposis coli) loss, which is observed in 80% of CRCs and by itself results in benign intestinal adenomas, the Pik3ca(H1047R) mutation promotes the development of highly aggressive and invasive adenocarcinomas in both the small and large intestines. The results of the present study show that an activating Pik3ca mutation can act in tandem with Apc loss to drive the progression of gastrointestinal cancer and thus this disease may be susceptible to therapeutic targeting using PI3K pathway inhibitors.
Keywordsadenomatous polyposis coli (Apc); colorectal cancer; mouse model; phosphoinositide 3-kinase (PI3K); phosphoinositide 3-kinase; catalytic; alpha polypeptide (Pik3ca)
- Click on "Export Reference in RIS Format" and choose "open with... Endnote".
- Click on "Export Reference in RIS Format". Login to Refworks, go to References => Import References