MiRNAs in activated mouse CD4 T cells by Bcl-6 overexpression
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE17000 | GEO | 2009/07/24
SECONDARY ACCESSION(S): PRJNA117327
REPOSITORIES: GEO
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Project description:Compare miRNA expression profiles in mouse CD4 T cells overexpression of Bcl-6 vs empty vector Mouse naïve CD4+ T cells were transduced with a Bcl-6-expressing retrovirus or the control vector and cultured in Th0 condition for 2 days. Cells expressing medium to high levels of GFP were sorted and total RNAs were isolated using mirVana miRNA Isolation Kit (Applied Biosystems). MiRNA expression was profiled using Agilent 8x15K mouse miRNA microarray miRNA-v1_95_May07 (miRBase Release 9.2) by Ramaciotti Centre for Gene Function Analysis (Sydney). Each sample was run in duplicate.
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Project description:Constitutive activation of EGFR- and NF-kB-dependent pathways is a hallmark of cancer, yet signaling proteins that connect both oncogenic cascades are poorly characterized. Here we define KIAA1199 as a BCL-3- and p65-dependent gene in transformed keratinocytes. KIAA1199 expression is enhanced upon human papillomavirus (HPV) infection and is aberrantly expressed in clinical cases of cervical (pre)neoplastic lesions. Mechanistically, KIAA1199 binds Plexin A2 and protects from Semaphorin 3A-mediated cell death by promoting EGFR stability and signaling. Moreover, KIAA1199 is an EGFR-binding protein and KIAA1199 deficiency impairs EGF-dependent Src, MEK1 and ERK1/2 phosphorylations. Therefore, EGFR stability and signaling to downstream kinases requires KIAA1199. As such, KIAA1199 promotes EGF-mediated epithelial-mesenchymal transition (EMT). Taken together, our data define KIAA1199 as an oncogenic protein induced by HPV infection and constitutive NF-kB activity that transmits pro-survival and invasive signals through EGFR signaling. We used microarrays to detail the global programme of gene expression upon BCL-3 overexpression We used two experimental conditions, namely HaCat cells infected with a control lentivirus as well as HaCat cells infected with a BCL-3 expressing construct. Both experimental conditions were in triplicates.
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Project description:Background: We hypothesized that spleen microarray gene expression profiles analyzed with contemporary pathway analysis software would provide molecular pathways of interest and target genes that might help explain the affect of bcl-2 on improving survival during sepsis. Methods: Two mouse models of sepsis, cecal ligation and puncture and tracheal instillation of Pseudomonas aeruginosa, were tested in both wild-type mice and mice that overexpress bcl-2. Whole spleens were obtained 6 hours after septic injury. DNA microarray transcriptional profiles were obtained using the Affymetrix 430A GeneChip, containing 22,690 elements. Ingenuity Pathway Analysis software was used to construct hypothetical transcriptional networks that changed in response to sepsis and expression of the bcl-2 transgene. Results: A conservative approach was used wherein only changes induced by both abdominal and pulmonary sepsis were studied. At 6 hours, sepsis induced alterations in the abundance of hundreds of spleen genes, including a number of proinflammatory mediators (e.g., IL-6). These sepsis-induced alterations were blocked by expression of the bcl-2 transgene. Network analysis implicated a number of bcl-2-related apoptosis genes, including bcl2L11 (bim), bcl-2L2 (bcl-w), bmf, and mcl-1. Sepsis in bcl-2 transgenic animals resulted in alteration of RNA abundance for only a single gene, ceacam1. Conclusion: These findings are consistent with sepsis-induced alterations in the balance of pro- and anti-apoptotic transcriptional networks. In addition, our data suggest that the ability of bcl-2 overexpression to improve survival in sepsis in this model is related in part to prevention of sepsis-induced alterations in spleen transcriptional responses. Keywords: Sepsis, bcl-2, wildtype, spleen, RNA expression, microarray
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