Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of human HMEC exposed to lactic acidosis and hypoxia

ABSTRACT: Human Mammalian Epithelial Cells (HMEC) were exposed to different environmental stresses, including hypoxia, lactic acidosis, the combination of hypoxia and lactic acidosis, lactosis , as well as acidosis. We used microarrays to examine the genomic programs of cells incubated under different microenvironments. Experiment Overall Design: HMEC cells were exposed to different environmental stresses and RNAs were extracted and put on Affymetrix microarrays. We gathered RNAs from cells grown in regular media (control), lactic acidosis, hypoxia, the combinatino of lactic acidosis and hypoxia, lactosis, as well as acidosis.

ORGANISM(S): Homo sapiens

SUBMITTER: Julia Ling-Yu Chen

PROVIDER: E-GEOD-9649 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

The genomic analysis of lactic acidosis and acidosis response in human cancers.

Chen Julia Ling-Yu JL Lucas Joseph E JE Schroeder Thies T Mori Seiichi S Wu Jianli J Nevins Joseph J Dewhirst Mark M West Mike M Chi Jen-Tsan JT

PLoS genetics 20081205 12

The tumor microenvironment has a significant impact on tumor development. Two important determinants in this environment are hypoxia and lactic acidosis. Although lactic acidosis has long been recognized as an important factor in cancer, relatively little is known about how cells respond to lactic acidosis and how that response relates to cancer phenotypes. We develop genome-scale gene expression studies to dissect transcriptional responses of primary human mammary epithelial cells to lactic aci ...[more]

PMID: 19057672

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Project description:Lactic acidosis and hypoxia are two prominent tumor microenvironmental stresses that are both known to exert important influences on gene expression and phenotypes of cancer cells. But very little is known about the cross-talk and interaction between these two stresses. We performed gene expression analysis of MCF7 cells exposed to lactic acidosis, hypoxia and combined lactic acidosis and hypoxia. We found the hypoxia response elicited under hypoxia was mostly abolished upon simultaneous exposure to lactic acidosis. The repression effects are due to loss of HIF-1Î± protein synthesis under lactic acidosis. In addition, we showed lactic acidosis strongly synergizes with hypoxia to activate the unfold protein response (UPR) and inflammation response which are highly similar to amino acid deprivation responses (AAR). The statistical factor analysis of hypoxia and lactic acidosis responses indicated that ATF4 locus, an important activator in the UPR/AAR pathway, is amplified in subsets of breast tumors and cancer cell lines. Varying ATF4 levels dramatically affect the ability to survive the post-stress recovery from hypoxia and lactic acidosis and may suggest its selection of ATF4 amplification in human cancers. These data suggest that lactic acidosis interacts with hypoxia by both inhibiting the canonical hypoxia response and while activating the UPR and inflammation response. Gain of ATF4 locus may offer survival advantages to allow successful adaptation to frequent fluctuations of oxygen and acidity in tumor microenvironment. Collectively, our studies have provided linkage between the short-term transcriptional responses to the long term selection of the DNA copy number alterations (CNAs) under tumor microenvironmental stresses. RNAs from MCF7 cells exposed to control condition (ambient air ~21% O2, no lactate and neutral pH), lactic acidosis (ambient air, 10 mM Lactate and pH 6.7), hypoxia (1% pO2, no lactate and neutral pH) and the combined lactic acidosis and hypoxia (1% pO2, 10 mM Lactate and pH 6.7) condition for 24 hours were extracted by miRVana kits (Ambion) and hybridized to Affymetrix Human genome 133A 2.0 arrays with standard protocol.

Dataset Information

Transcription profiling of human HMEC exposed to lactic acidosis and hypoxia

Publications

The genomic analysis of lactic acidosis and acidosis response in human cancers.

Similar Datasets

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