Effect of cigarette smoke on gene expression in mammary epithelial cells
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: Di Cello F
PROVIDER: S-ECPF-GEOD-42668 | biostudies-other | 2013
REPOSITORIES: biostudies-other
Similar Datasets
Project description:Recent epidemiological studies demonstrate that both active and involuntary exposure to tobacco smoke increases the risk of breast cancer. Little is known, however, about the molecular mechanisms by which tobacco smoke contributes to breast carcinogenesis. To investigate these mechanisms we have analyzed gene expression and methylation in MCF 10A mammary epithelial cells chronically exposed to aqueous cigarette smoke extract (CSE). CSE was prepared weekly and added to the cell cultures at a concentration equivalent to 0.001 cigarettes/ml. Two clones were isolated after 13 weeks of treatment and expanded in the same concentration of CSE for 8 additional weeks. Mock-treated samples were prepared in parallel.
| S-ECPF-GEOD-42667 | biostudies-other
Project description:This SuperSeries is composed of the SubSeries listed below.
2013-08-12 | GSE42668 | GEO
Project description:Recent epidemiological studies demonstrate that both active and involuntary exposure to tobacco smoke increases the risk of breast cancer. Little is known, however, about the molecular mechanisms by which tobacco smoke contributes to breast carcinogenesis. To investigate these mechanisms we have analyzed gene expression and methylation in MCF 10A mammary epithelial cells chronically exposed to aqueous cigarette smoke extract (CSE).
2013-08-12 | GSE42667 | GEO
Project description:Recent epidemiological studies demonstrate that both active and involuntary exposure to tobacco smoke increases the risk of breast cancer. Little is known, however, about the molecular mechanisms by which tobacco smoke contributes to breast carcinogenesis. To investigate these mechanisms we have analyzed gene expression and methylation in MCF 10A mammary epithelial cells chronically exposed to aqueous cigarette smoke extract (CSE).
2013-08-12 | GSE42623 | GEO
Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series
2013-08-12 | E-GEOD-42668 | biostudies-arrayexpress
Project description:Recent epidemiological studies demonstrate that both active and involuntary exposure to tobacco smoke increases the risk of breast cancer. Little is known, however, about the molecular mechanisms by which tobacco smoke contributes to breast carcinogenesis. To investigate these mechanisms we have analyzed gene expression and methylation in MCF 10A mammary epithelial cells chronically exposed to aqueous cigarette smoke extract (CSE). CSE was prepared weekly and added to the cell cultures at a concentration equivalent to 0.001 cigarettes/ml. Two clones were isolated after 13 weeks of treatment and expanded in the same concentration of CSE for 8 additional weeks. Mock-treated samples were prepared in parallel.
2013-08-12 | E-GEOD-42667 | biostudies-arrayexpress
Project description:Recent epidemiological studies demonstrate that both active and involuntary exposure to tobacco smoke increases the risk of breast cancer. Little is known, however, about the molecular mechanisms by which tobacco smoke contributes to breast carcinogenesis. To investigate these mechanisms we have analyzed gene expression and methylation in MCF 10A mammary epithelial cells chronically exposed to aqueous cigarette smoke extract (CSE). CSE was prepared weekly and added to the cell cultures at a concentration equivalent to 0.001 cigarettes/ml for 21 weeks. Mock-treated samples were prepared in parallel.
2013-08-12 | E-GEOD-42623 | biostudies-arrayexpress
Project description:Idiopathic pulmonary fibrosis (IPF) is a progressive and lethal disease of unknown etiology. A growing body of evidence indicates that it may result from an aberrant activation of alveolar epithelium, which induces the expansion of the fibroblast population, their differentiation to myofibroblasts and the excessive accumulation of extracellular matrix. The mechanisms that activate the alveolar epithelium are unknown, but several studies indicate that smoking is the main environmental risk factor for the development of IPF. In this study we explored the effect of cigarette smoke on the gene expression profile and signaling pathways in alveolar epithelial cells. Lung epithelial cell line from human (A549), was exposed to cigarette smoke extract (CSE) for 1, 3, and 5 weeks at 1, 5 and 10% and gene expression was evaluated by complete transcriptome microarrays. Signaling networks were analyzed with the Ingenuity Pathway Analysis software. At 5 weeks of exposure, alveolar epithelial cells acquired a fibroblast-like phenotype. At this time, gene expression profile revealed a significant increase of more than 1000 genes and deregulation of canonical signaling pathways such as TGF-β and Wnt. Several profibrotic genes involved in EMT were over-expressed, and incomplete EMT was observed in these cells, and corroborated in mouse (MLE-12) and rat (RLE-6TN) epithelial cells. The secretion of activated TGF-β1 increased in cells exposed to cigarette smoke, which decreased when the integrin alpha v gene was silenced. These findings suggest that the exposure of alveolar epithelial cells to CSE induces the expression and release of a variety of profibrotic genes, and the activation of TGF-β1, which may explain at least partially, the increased risk of developing IPF in smokers.
| S-EPMC4775036 | biostudies-literature
Project description:Rationale: The effects of hookah smoke on respiratory epithelia have not been well characterized. Objectives: To characterize and compare the effects of hookah tobacco smoke and conventional cigarette smoke on the epigenome and transcriptome of human respiratory epithelia. Methods: Normal human small airway epithelial cells and cyclin-dependent kinase 4/human telomerase reverse transcriptase–immortalized human bronchial epithelial cells were cultured for 5 days in normal media in the presence or absence of water pipe condensates or cigarette smoke condensates under relevant exposure conditions. CyQUANT assay (Thermo Fisher Scientific), RNA sequencing, quantitative reverse transcriptase–polymerase chain reaction, and Western blotting techniques were used to examine/compare the effects of hookah and cigarette smoke on cell proliferation, messenger RNA/microRNA expression, and global histone marks. Results: Water pipe condensates– and cigarette smoke condensates–mediated, dose-dependent growth-inhibitory effects in cultured respiratory epithelial cells were measured. Under conditions mediating equipotent mild to moderate growth-inhibitory effects, water pipe condensates as well as cigarette smoke condensates decreased histone H4 lysine 15 acetylation (H4K16ac) and histone H4 lysine 20 trimethylation (H4K20me3) levels in small airway epithelial cells and human bronchial epithelial cells; these histone alterations are putative “hallmarks of cancer.” RNA sequencing analysis demonstrated that cigarette smoke condensates and water pipe condensates mediated dose-dependent alterations in gene expression in small airway epithelial cells and human bronchial epithelial cells. A total of 873 genes were commonly regulated (fold change >2) by water pipe condensates (1.0 mg/ml) and cigarette smoke condensates (0.05 mg/ml) in small airway epithelial cells, whereas a total of 1,577 genes were commonly regulated by water pipe condensates (1.0 mg/ml) and cigarette smoke condensates (0.05 mg/ml) in human bronchial epithelial cells. Ingenuity Pathway Analysis (QIAGEN Bioinformatics) of the 100 genes commonly regulated by water pipe condensates and cigarette smoke condensates in small airway epithelial cells and human bronchial epithelial cells demonstrated that the top three activated upstream regulators are cigarette smoke (z-score?=?2.577), benzo[a]pyrene (z-score?=?2.905), and nuclear factor (erythroid-derived 2)-like 2 (NFE2L2, Nrf2) (z-score?=?2.531). Analysis of downstream effects indicated that growth of epithelial tissue was predicted to be increased (z-score?=?2.813; P?<?0.001). The top three canonical pathways included xenobiotic metabolism signaling, aryl hydrocarbon receptor signaling, and nicotine degradation III. Conclusions: These preliminary findings strongly suggest that hookah tobacco is not a safe alternative to cigarettes, and warrant further evaluation of the epigenomic effects of hookah smoke in human respiratory epithelia using our established laboratory models and correlative analyses in hookah smokers.
| S-EPMC5946508 | biostudies-literature
Project description:Chromosomal abnormalities are commonly found in bronchogenic carcinoma cells, but the molecular causes of chromosomal instability (CIN) and their relationship to cigarette smoke has not been defined. Because the Fanconi anaemia (FA)/BRCA pathway is essential for maintenance of chromosomal stability, we tested the hypothesis that cigarette smoke suppresses that activity of this pathway. Here, we show that cigarette smoke condensate (CSC) inhibited translation of FANCD2 mRNA (but not FANCC or FANCG) in normal airway epithelial cells and that this suppression of FANCD2 expression was sufficient to induce both genetic instability and programmed cell death in the exposed cell population. Cigarette smoke condensate also suppressed FANCD2 function and induced CIN in bronchogenic carcinoma cells, but these cells were resistant to CSC-induced apoptosis relative to normal airway epithelial cells. We, therefore, suggest that CSC exerts pressure on airway epithelial cells that results in selection and emergence of genetically unstable somatic mutant clones that may have lost the capacity to effectively execute an apoptotic programme. Carcinogen-mediated suppression of FANCD2 gene expression provides a plausible molecular mechanism for CIN in bronchogenic carcinogenesis.
| S-EPMC2391131 | biostudies-literature