Project description:Inflammatory tissues are characterized by low oxigen concentrations (hypoxia). These conditions are very different from that usually present in tissue cultures where transcriptomic profiles of human fibroblasts from inflammatory tissues have been previously analysed. The aim of this study was to characterize the changes on gene expression induced by hypoxia in human synovial fibroblasts. We used microarray expression profiling in paired normoxic and hypoxic cultures of healthy and rheumatoid arthritis (RA) synovial fibroblasts (HSF and RASF). Hypoxia induces significant changes on the expression of large groups of genes in both HSF and RASF. The hypoxic and normoxic profiles are also different between both groups. These data demonstrate that hypoxia induces significant changes on gene expression in HSF and RASF and identify differences between RASF and HSF. Synovial fibroblasts obtained from 6 patients with rheumatoid arthritis (RASF) and 6 sex and age matched adult healthy donors (HSF) were used. SF cultures were incubated for 22 hours under normoxic or hypoxic (0.5% O2) conditions. Nine experiments per group were performed, single experiments with three SF lines, and duplicated in other three lines per group. All 18 normoxia-hypoxia experiments (36 microarray data) were used for paired analysis of the changes induced by hypoxia in HSF or RASF.
Project description:Human umbilical vein endothelial cells (HUVECs) were incubated for 48 h under normoxic or hypoxic (1% oxygen) conditions. Changes in transcript and exon levels were analyzed.
Project description:Malignant melanoma is a complex genetic disease and the most aggressive form of skin cancer. Melanoma progression and metastatic dissemination fundamentally relies on the process of angiogenesis. Melanomas produce an array of angiogenic modulators that mediate pathological angiogenesis. Such tumor-associated modulators arbitrate the enhanced proliferative, survival and migratory responses exhibited by endothelial cells, in the hypoxic tumor environment. The current study focuses on melanoma-induced survival of endothelial cells under hypoxic conditions. Melanoma conditioned media were capable of enabling prolonged endothelial cell survival under hypoxia, in contrast with the conditioned media derived from melanocytes, breast and pancreatic tumors. To identify the global changes in gene expression and further characterize the pro-survival pathway induced in endothelial cells, we performed microarray analysis on endothelial cells treated with melanoma conditioned medium under normoxic and hypoxic conditions. Huvec cells were grown in melanoma conditioned medium or DMEM 10% FCS for 12 h under hypoxic or normoxic conditions. In order to identify the transcripts modulated by melanoma CM, samples treated with MCM were compared to those grown in DMEM alone.
Project description:Outcome prediction classifiers were successfully constructed through expression profiling of a total of 1,329 miRNAs in MKN1, gastric cancer cell line under normoxic and hypoxic conditions. In the study presented here, MKN1 under normoxic and hypoxic conditions was used to acquire expression profiles of a total 1,329 unique miRNAs.
Project description:The purpose of this analysis is to analyze the changes that occur in microRNAs contained in exosomes released from cancer cells in the tumor hypoxic environment of esophageal squamous cell carcinoma(ESCC). We used microarrays to perform a comprehensive analysis of microRNAs in exosomes released from human ESCC cell lines under normoxic or hypoxic conditions.
Project description:Human umbilical vein endothelial cells (HUVECs) were incubated for 48 h under normoxic or hypoxic (1% oxygen) conditions. Changes in transcript and exon levels were analyzed. 6 samples; 2 conditions: normoxia vs. hypoxia (1% oxygen); 3 replicates per condition
Project description:A gene expression profiles of human oral squamous cell carcinoma lines, HSC-2 and Ca9-22, cultured under hypoxic conditions (1% pO2 for 24 or 48 hours) were compaired with those under normoxic conditions (21% pO2).
