Transcriptional data from yeast expressing mammalian PIK3CA
Ontology highlight
ABSTRACT:
ORGANISM(S): Schizosaccharomyces pombe Saccharomyces cerevisiae
PROVIDER: GSE59596 | GEO | 2014/07/19
SECONDARY ACCESSION(S): PRJNA255676
REPOSITORIES: GEO
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2014-07-19 | E-GEOD-59596 | biostudies-arrayexpress
Project description:Mutations in PIK3CA, the gene encoding the p110α subunit of PI3K, induce transformation of mammary epithelial cells (MEC). Studies suggest the transforming action of mutant PIK3CA requires binding to activated receptor tyrosine kinases or adaptors. We examined in transgenic mice if ErbB3, a powerful activator of PI3K, is required for mutant PIK3CA-mediated MEC transformation. ErbB3 loss delayed PIK3CAH1047R-dependent mammary gland hyperplasia, but tumor latency, gene expression and markers of PI3K signaling were unaffected. In ErbB3-deficient tumors, mutant PI3K remained associated with other tyrosine phosphorylated adaptors, potentially explaining the dispensability of ErbB3 for tumorigenicity and PI3K activity. Combined inhibition of ErbB RTKs and PI3K with lapatinib and the p110α inhibitor BYL719, respectively, reduced PIK3CAH1047R-dependent tumor growth and PI3K signaling more potently than the p110α inhibitor alone. In human breast cancer cells harboring PIK3CAH1047R, the combination with BYL719 and an ErbB3 inhibitor synergistically inhibited tumor growth and P-Akt. These data suggest that basal tumor growth and PI3K signaling do not depend on ErbB RTKs in PIK3CAH1047R-expressing tumors. However, upon inhibition of p110α, these receptors limit the action of PI3K inhibitors potentially explaining the more potent effect of the combination against PI3K-mutant cancers. reference x sample
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Project description:Skeletal muscle insulin resistance, decreased phosphatidylinositol 3-kinase (PI3K) activation and altered mitochondrial function are hallmarks of type 2 diabetes. We created mice with a muscle-specific knockout of p110α or p110β, the two major catalytic subunits of PI3K. We find that mice with muscle-specific knockout of p110α, but not p110β, display impaired muscle insulin signaling and reduced muscle size due to enhanced proteasomal and autophagic activity. Despite insulin resistance and muscle atrophy, M-p110αKO mice show decreased serum myostatin, increased mitochondrial mass, increased mitochondrial fusion visualized by intravital microscopy, and increased PGC1α expression, especially PCG1α2 and PCG1α3. This leads to enhanced mitochondrial oxidative capacity, striking increases in muscle NADH content, and higher muscle free radical release measured in vivo using pMitoTimer reporter. Thus, p110α is the dominant catalytic isoform of PI3K in muscle in control of insulin sensitivity and muscle mass, and has a unique role in mitochondrial homeostasis in skeletal muscle.
2019-03-12 | GSE124394 | GEO
Project description:Purpose: The phosphoinositide 3-kinase (PI3K) pathway is fundamental for cell proliferation and survival and is frequently altered and activated in neoplasia, including carcinomas of the lung. In this study we investigated the potential of targeting the catalytic class IA PI3K isoforms in small cell lung cancer (SCLC), which is the most aggressive of all lung cancer types. Experimental Design: The expression of PI3K isoforms in patient specimens was analyzed. The effects on SCLC cell survival and downstream signaling were determined following PI3K isoform inhibition by selective inhibitors or down-regulation by small interfering RNA. Results: Over-expression of the PI3K isoforms p110α and p110β was shown by immunohistochemistry in primary SCLC tissue samples. Targeting the PI3K p110α with RNA interference (RNAi) or selective pharmacological inhibitors resulted in strongly affected cell proliferation of SCLC cells in vitro and in vivo, while targeting p110β was less effective. Inhibition of p110α also resulted in increased apoptosis and autophagy, which was accompanied by decreased phosphorylation of Akt and components of the mammalian target of rapamycin (mTOR) pathway, such as the ribosomal S6 protein, and the eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1). A DNA microarray analysis revealed that p110α inhibition profoundly affected the balance of pro- and anti-apoptotic Bcl-2 family proteins. Finally, p110α inhibition led to impaired SCLC tumor formation and vascularization in vivo. Conclusion: Together our data demonstrate the key involvement of the PI3K isoform p110α in multiple tumor-promoting processes in SCLC.
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Project description:We have compared the proteome, transcriptome and metabolome of two isogenic cell lines: MCF-10A, derived from human breast epithelium, and the mutant MCF-10A-H1047R. These cell lines differ by a single amino acid substitution (H1047R) caused by single nucleotide change in one allele of the PIK3CA gene which encodes the catalytic subunit p110α of phosphatidylinositol 3-kinase (PI3K). The H1047R mutation of PIK3CA is one of the most frequently encountered somatic cancer-specific mutations. In MCF-10A, this mutation induces an extensive cellular reorganization that far exceeds the known signaling activities of PI3K. The changes are highly diverse; with examples in structural protein levels, the DNA repair machinery and sterol synthesis. Gene set enrichment analysis reveals a highly significant concordance of the genes differentially expressed in MCF-10A-H1047R cells and the established protein and RNA signatures of basal breast cancer. No such concordance was found with the specific gene signatures of other histological types of breast cancer. Our data document the power of a single base mutation, inducing an extensive remodeling of the cell toward the phenotype of a specific cancer.
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Project description:Objectives: Phosphatidylinositol 3-kinase catalytic subunit alpha (PIK3CA) is commonly altered in many human tumors, leading to the activation of p110α enzymatic activity that stimulates growth factor-independent cell growth. PIK3CA alterations such as mutation, gene amplification and overexpression are common in head and neck squamous cell carcinoma (HNSCC) and. We aim to explore how these alterations and clinical outcome are associated, as well as the molecular mechanisms involved. Material and methods: Mutation and copy-number variation in PIK3CA, and whole-genome expression profiles, were analyzed in primary HNSCC tumors from The Cancer Genome Atlas (TCGA) cohort (n=243). The results were validated in an independent cohort form the University Hospital of A Coruña (UHAC, n=62). Expression of the PIK3CA gene protein product (PI3K p110α) and nuclear YAP were assessed in tissue microarrays in a cohort from the University Hospital 12 de Octubre (UH12O, n=91). Results: Only high expression of the PIK3CA gene was associated with poor clinical outcome. The study of gene expression, transcription factor and protein signatures suggested that the activation of the Hippo-YAP pathway, involved in organ size, stem cell maintenance and tumorigenesis, could underlie tumor progression in PI3KCA overexpressing tumors. Tissue arrays showed that PI3K p110α levels correlated with YAP nuclear localization in HNSCC tumors. Conclusions: High expression of PIK3CA in HNSCC primary tumors identifies patients at high risk for recurrence. In these tumors, progression could rely on the Hippo-YAP pathway instead of the canonical Akt/mTOR pathway. This observation could have important implications in the therapeutic options for patients.
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2011-01-10 | E-GEOD-22035 | biostudies-arrayexpress
Project description:We have compared the proteome, transcriptome and metabolome of two isogenic cell lines: MCF-10A, derived from human breast epithelium, and the mutant MCF-10A-H1047R. These cell lines differ by a single amino acid substitution (H1047R) caused by single nucleotide change in one allele of the PIK3CA gene which encodes the catalytic subunit p110α of phosphatidylinositol 3-kinase (PI3K). The H1047R mutation of PIK3CA is one of the most frequently encountered somatic cancer-specific mutations. In MCF-10A, this mutation induces an extensive cellular reorganization that far exceeds the known signaling activities of PI3K. The changes are highly diverse; with examples in structural protein levels, the DNA repair machinery and sterol synthesis. Gene set enrichment analysis reveals a highly significant concordance of the genes differentially expressed in MCF-10A-H1047R cells and the established protein and RNA signatures of basal breast cancer. No such concordance was found with the specific gene signatures of other histological types of breast cancer. Our data document the power of a single base mutation, inducing an extensive remodeling of the cell toward the phenotype of a specific cancer. 2 cell lines (H1047R and WT), 4 time points (0, 6, 12, 24 hours), 3 replicates
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