Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Shld1 effect on 3T3 cell

ABSTRACT: NIH3T3 cells were cultured in medium containing 1 uM, 100 nM, 10 nM and 0 nM (serve as control) shld1 for 24 hours. Three independent cultures were obtained for each drug concentration. Total RNA from experimental samples were extracted using RNeasy Kit (Qiagen). Mouse RNA pooled from 11 cell lines (Stratagene, La Jolla, CA) was used as reference. Cy5-dUTP and Cy3-dUTP, were used to label the experimental cDNA and the reference samples, respectively, and hybridized to the Mouse Exonic Evidence Based Oligonucleotide (MEEBO) arrays (http://www.microarray.org./sfgf/meebo). The hybridizations were performed by Stanford Functional Genome Facility using its standard protocol (Oligo Array Hybridization protocol, http://www.microarray.org./sfgf/docView.do?type=2). A compound treatment design type is where the response to administration of a compound or chemical (including biological compounds such as hormones) is assayed. Computed

ORGANISM(S): Mus musculus

SUBMITTER: Ling-Chun Chen

PROVIDER: E-GEOD-5916 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

A directed approach for engineering conditional protein stability using biologically silent small molecules.

Maynard-Smith Lystranne A LA Chen Ling-Chun LC Banaszynski Laura A LA Ooi A G Lisa AG Wandless Thomas J TJ

The Journal of biological chemistry 20070701 34

The ability to regulate the function of specific proteins using cell-permeable molecules can be a powerful method for interrogating biological systems. To bring this type of "chemical genetic" control to a wide range of proteins, we recently developed an experimental system in which the stability of a small protein domain expressed in mammalian cells depends on the presence of a high affinity ligand. This ligand-dependent stability is conferred to any fused partner protein. The FK506- and rapamy ...[more]

PMID: 17603093

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Project description:In response to polarization cues, cultured Caco-2 cells, a human colon adenocarcinoma-derived cell line, form a polarized epithelium resembling normal enterocytes. We investigated potential signaling mechanisms activated by Caco-2 cells that might trigger the genome-wide transcriptional reprogramming that accompanies polarization (Saaf et al, submitted-I). cDNA microarrays were used to compare the transcriptional profile of Caco-2 polarization to the gene expression profiles of normal human colon and colon tumors. The transcript profile of proliferating, non-polarized Caco-2 cells has striking parallels to the gene expression profile of human colon cancer in vivo. However, as Caco-2 cells develop polarity, the gene expression profile shifts to one more closely resembling that of normal colon tissue, suggesting that the underlying regulatory mechanisms that mediate Caco-2 cell polarization are similar to those that occur during in vivo enterocyte differentiation. We show that transcriptional re-programming of Caco-2 cells during development of cell polarity occurs in the context of signaling pathways that are regulated in a manner that is remarkably similar to those in normal intestinal development. For example, transcriptional targets of the Wnt pathway are tightly regulated during Caco-2 cell polarization, mimicking the gradient of Wnt-mediated transcription in the crypt (high expression) to villus (low expression) axis in human intestine. However, Caco-2 cells lack full-length APC necessary for normal Wnt-regulated degradation of beta-catenin. Biochemical analysis indicates that regulation of the Wnt pathway occurs in the nucleus at the level of activation of target genes by the beta-catenin-TCF complex, revealing a novel additional mechanism by which intestinal cells may regulate Wnt signaling during their maturation. In addition, other signaling pathways including Notch, BMP, Hedgehog, and growth factor, were temporally regulated during Caco-2 cell polarization. Surprisingly, modulation of these signaling pathways in Caco-2 cells occurs in the absence of morphogen gradients and interactions with stromal cells characteristic of enterocyte differentiation in situ. This dataset contains gene expression profiles of 9 normal colon samples and 15 colon tumor samples. Samples of tumor and normal colon mucosa were collected from colon cancer resection from Department of Surgery, Queen Mary Hospital University of Hong Kong. Tissue was frozen in liquid nitrogen within 30 min of resection. Nonneoplastic mucosa from colon was dissected free of muscle and histologically confirmed to be tumor free by frozen section. Total RNA was extracted using Trizol (Invitrogen, Carlsbad, CA) from each tissue sample and processed for microarray hybridization. A disease state experiment design type is where the state of some disease such as infection, pathology, syndrome, etc is studied. Disease State: Tumor/Normal colon samples Using regression correlation

Dataset Information

Shld1 effect on 3T3 cell

Publications

A directed approach for engineering conditional protein stability using biologically silent small molecules.

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