Project description:RNA expression profiling was performed on normal human lung fibroblast WI38 cells following overexpression of p53 and pRb, in order to identify genes co-regulated and involved in mediating p53 and pRb tumor suppressor processes.
Project description:miRNA expression profiles of WI38 primary human fibroblasts with an active or inactive p53. Cells were compared under normal untreated conditions (young and proliferating cells), after DNA damage with Doxorubicin, and upon entry into replicative senescence. Keywords: miRNA, WI-38, p53, GSE56, Senescence, Doxorubicin, Cancer, DNA-damage, fibroblasts.
Project description:miRNA expression profiles of WI38 primary human fibroblasts with an active or inactive p53. Cells were compared under normal untreated conditions (young and proliferating cells), after DNA damage with Doxorubicin, and upon entry into replicative senescence. Keywords: miRNA, WI-38, p53, GSE56, Senescence, Doxorubicin, Cancer, DNA-damage, fibroblasts. 6 samples of WI38 cells were analyzed on 12 Exiqon miRcurry LNA arrays in biological duplicates (2 different cell culture plates for each experimental condition). The six conditions included: 1. [Con_Young] - Primary Young WI38 cells (passage 20) with a control retroviral vector (pLXSN-NEO). Untreated. 2. [GSE_Young] -Primary Young WI38 cells (passage 20) with a retroviral vector encoding for the p53-inactivating peptide GSE56 (pLXSN-NEO-GSE56).Untreated. 3. [Con_Dox] -Primary Young WI38 cells (passage 20) with a control retroviral vector (pLXSN-NEO). Treated with Doxorubicin (0.2 micrograms/ml) for 24 hours). 4. [GSE_Dox] Primary Young WI38 cells (passage 20) with a retroviral vector encoding for the p53-inactivating peptide GSE56 (pLXSN-NEO-GSE56). Treated with Doxorubicin (0.2 micrograms/ml) for 24 hours). 5. [Con_Old] - Sesescent WI38 cells (passage 30) with a control retroviral vector (pLXSN-NEO). Untreated. 6. [GSE_Old] - Senescent WI38 cells (passage 26) with a retroviral vector encoding for the p53-inactivating peptide GSE56 (pLXSN-NEO-GSE56).Untreated. RNA was extracted with TRI-Reagent and sent for labeling and hybridization in Exiqon laboratories (In Denamark). Samples were labeled with Cy5. Reference sample (Cy3) was an RNA mix of all samples. Log2 for Ratio(Cy5/Cy3) was used for further analysis.
Project description:Transcriptome analysis of control and MALAT1 lncRNA-depleted RNA samples from human diploid lung fibroblasts [WI38] The long noncoding MALAT1 RNA is upregulated in cancer tissues and its elevated expression is associated with hyper-proliferation, but the underlying mechanism is poorly understood. We demonstrate that MALAT1 levels are regulated during normal cell cycle progression. Genome-wide transcriptome analyses in normal human diploid fibroblasts reveal that MALAT1 modulates the expression of cell cycle genes, and is required for G1/S and mitotic progression. Depletion of MALAT1 leads to activation of p53 and its target genes. The cell cycle defects observed in MALAT1-depleted cells are sensitive to p53 levels, indicating that p53 is a major downstream mediator of MALAT1 activity. Furthermore, MALAT1-depleted cells display reduced expression of B-MYB (Mybl2), an oncogenic transcription factor involved in G2/M progression, due to altered binding of splicing factors on B-MYB pre-mRNA and aberrant alternative splicing. In human cells, MALAT1 promotes cellular proliferation by modulating the expression and/or pre-mRNA processing of cell cycle-regulated transcription factors. These findings provide mechanistic insights on the role of MALAT1 in regulating cellular proliferation. We analyzed RNA from control and MALAT1 depleted WI38 cells using the Affymetrix Human Exon 1.0 ST platform. Array data was analyzed by Partek Genomic Suite software.
Project description:Determine the contribution of repressive H3-K27me3 marks on differential gene expression in primary human fibroblasts from fetal lung (WI38), adult lung, adult abdomen, and adult breast under conditions of proliferation, and for the WI38 cells, in senescence induced by etoposide.
Project description:Transcriptome analysis of control and MALAT1 lncRNA-depleted RNA samples from human diploid lung fibroblasts [WI38] The long noncoding MALAT1 RNA is upregulated in cancer tissues and its elevated expression is associated with hyper-proliferation, but the underlying mechanism is poorly understood. We demonstrate that MALAT1 levels are regulated during normal cell cycle progression. Genome-wide transcriptome analyses in normal human diploid fibroblasts reveal that MALAT1 modulates the expression of cell cycle genes, and is required for G1/S and mitotic progression. Depletion of MALAT1 leads to activation of p53 and its target genes. The cell cycle defects observed in MALAT1-depleted cells are sensitive to p53 levels, indicating that p53 is a major downstream mediator of MALAT1 activity. Furthermore, MALAT1-depleted cells display reduced expression of B-MYB (Mybl2), an oncogenic transcription factor involved in G2/M progression, due to altered binding of splicing factors on B-MYB pre-mRNA and aberrant alternative splicing. In human cells, MALAT1 promotes cellular proliferation by modulating the expression and/or pre-mRNA processing of cell cycle-regulated transcription factors. These findings provide mechanistic insights on the role of MALAT1 in regulating cellular proliferation.
Project description:We compare the methylation status of CpG island clones by MeDIP in SW48 colon cancer cells relative to normal colon mucosa and WI38 primary fibroblasts. Keywords: ordered