Unknown,Transcriptomics,Genomics,Proteomics

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Expression data from human oral epithelial cell line

ABSTRACT: A majority of individuals infected with human immunodeficiency virus (HIV) have inadequate access to antiretroviral therapy and ultimately develop debilitating oral infections that often correlate with disease progression. Our study evaluates the impact of chronic exposure to the pro-inflammatory cytokine, interferon gamma, on the growth and barrier functions of the oral epithelium. Microarrays were used to characterize changes in gene expression in the TR146 oral epithelial cell line that occur in response to constitutive exposure to interferon gamma in the growth media. TR146 epithelial cells were grown to confluence in two 6-well culture plates in the presence (plate 1) or absence (plate 2) of interferon gamma and used for RNA extraction and hybridization on Affymetrix microarrays.

ORGANISM(S): Homo sapiens

SUBMITTER: Michael George

PROVIDER: E-GEOD-51439 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Interferon-gamma (IFN-gamma) is approved as a drug to treat chronic granulomatous disease and osteopetrosis and is also used in hyperimmunoglobulin E syndromes. These primary immunodeficiencies involve defects in neutrophils/polymorphonuclear cells. Neutrophils mature in the bone marrow and then enter the blood where they quickly undergo apoptotic cell death with a half-life of 5-10 hours. Therefore we reasoned that IFN-gamma might exert its effects on neutrophils via prolonged exposure to cells undergoing maturation toward a terminally differentiated state in the marrow rather than by its brief exposure to short-lived circulating cells. To explore this possibility we made use of PLB-985 cells which are a myeloblast-like myeloid cell line that can be differentiated into a mature, neutrophil-like state by treatment with various agents including DMSO. In initial studies we investigated transcription and protein expression in PLB-985 cells undergoing DMSO-mediated maturation in the presence or absence of IFN-gamma and identified several classes of immunity related genes that were differentially expressed in the presence of the drug and could potentially explain the immune supportive properties of IFN-gamma. Next we explored if the effect of IFN-gamma on expression of these genes is dependent on whether the cells are undergoing maturation; to do this we compared the effects of IFN-gamma on cells cultured with and without DMSO. For a subset of genes the expression level changes caused by IFN-gamma were much greater in maturing cells than non-maturing cells. These findings indicate that developmental changes associated with cell maturation can modulate the effects of IFN-gamma and supports our hypothesis that the effects of the drug on developing neutrophils in the bone marrow may be very different from its effects on mature cells in the blood. We also compared the effects on gene expression of applying IFN-gamma either during DMSO mediated PLB-985 cell maturation or after maturation i.e. IFN-gamma was applied to already mature cells. For some genes we found that IFN-gamma applied to mature cells caused large changes in expression similar to those seen when IFN-gamma was applied during maturation, however for other genes no effect was seen when drug was applied to mature cells but large effects were seen when drug was applied during DMSO treatment. This data suggests that, in the former class of genes, the effects of IFN-gamma application during maturation are largely the result of the effects of the drug on cells approaching full maturity but in the latter class of genes the effects of IFN-gamma only become apparent when it is present throughout maturation. This further supports our hypothesis that the effects of IFN-gamma are modulated by developmental changes associated with cell maturation.

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Expression data from human oral epithelial cell line

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