Activation of diverse signalling pathways by oncogenic PIK3CA mutations

Xinyan Wu, Santosh Renuse, Nandini A. Sahasrabuddhe, Muhammad Saddiq Zahari, Raghothama Chaerkady, Min Sik Kim, Raja S. Nirujogi, Morassa Mohseni, Praveen Kumar, Rajesh Raju, Jun Zhong, Jian Yang, Johnathan Neiswinger, Jun Seop Jeong, Robert Newman, Maureen A. Powers, Babu Lal Somani, Edward Gabrielson, Saraswati Sukumar, Vered StearnsJiang Qian, Heng Zhu, Bert Vogelstein, Ben Ho Park, Akhilesh Pandey

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The PIK3CA gene is frequently mutated in human cancers. Here we carry out a SILAC-based quantitative phosphoproteomic analysis using isogenic knockin cell lines containing driver oncogenic mutations of PIK3CA to dissect the signalling mechanisms responsible for oncogenic phenotypes induced by mutant PIK3CA. From 8,075 unique phosphopeptides identified, we observe that aberrant activation of PI3K pathway leads to increased phosphorylation of a surprisingly wide variety of kinases and downstream signalling networks. Here, by integrating phosphoproteomic data with human protein microarray-based AKT1 kinase assays, we discover and validate six novel AKT1 substrates, including cortactin. Through mutagenesis studies, we demonstrate that phosphorylation of cortactin by AKT1 is important for mutant PI3K-enhanced cell migration and invasion. Our study describes a quantitative and global approach for identifying mutation-specific signalling events and for discovering novel signalling molecules as readouts of pathway activation or potential therapeutic targets.

Original languageEnglish (US)
Article number4961
JournalNature communications
StatePublished - 2014

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


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