Linked Life Data

19157552

Source:http://linkedlifedata.com/resource/pubmed/id/19157552

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2009-3-25
pubmed:abstractText
Inflammation is a major contributing factor to many blinding disorders including uveitis, diabetic retinopathy, and age-related macular degeneration. Here we examined the response of the retinal pigment epithelium (RPE) to physiological levels of lipopolysaccharide (LPS) to understand the role of this epithelium in inflammatory retinal conditions. Expression of a group of inflammatory mediators was identified by gene array analysis and confirmed by PCR and immunocytochemistry in primary human RPE cultures and ARPE19. The effects of LPS on the expression of these cytokines and RPE survival were examined by PCR, Luminex bead, and MTT assays. RPE cells express many cytokine receptors including IL-1R, -4R, -6R, -8RA, IFNAR1, IFNGR1/2 and secrete a range of pro- and anti-inflammatory cytokines including IL-4, -6, -8, -10, -17, IFN-gamma, MCP-1, and VEGF. LPS increases IL-13RA1 and IFNAR1, and decreases IL-7R receptor expression. It also increases RPE secretion of IL-4, -6, -8, -10, IFN-gamma and MCP-1, and is toxic to RPE cells at LC(50)=17.7 microg/ml. LPS toxicity is mediated by IL-6 and IL-8 through an autocrine feedback loop. Silencing IL-6R and IL-8RA gene expression by siRNA blocks death by their respective ligands or LPS. These findings imply that RPE cells are acutely sensitive to inflammatory stress and that over secretion of IL-6 and IL-8 by this epithelium during inflammatory stimulus may be an underlying factor in the progression of some retinal pathologies.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1872-9142
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
46
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1374-86
pubmed:meshHeading
pubmed-meshheading:19157552-Autocrine Communication, pubmed-meshheading:19157552-Bacterial Proteins, pubmed-meshheading:19157552-Cells, Cultured, pubmed-meshheading:19157552-Disease Progression, pubmed-meshheading:19157552-Dose-Response Relationship, Drug, pubmed-meshheading:19157552-Endotoxins, pubmed-meshheading:19157552-Epithelial Cells, pubmed-meshheading:19157552-Gene Expression Profiling, pubmed-meshheading:19157552-Humans, pubmed-meshheading:19157552-Inflammation, pubmed-meshheading:19157552-Interleukin-6, pubmed-meshheading:19157552-Interleukin-8, pubmed-meshheading:19157552-Middle Aged, pubmed-meshheading:19157552-Oligonucleotide Array Sequence Analysis, pubmed-meshheading:19157552-Receptors, Cytokine, pubmed-meshheading:19157552-Retinal Degeneration, pubmed-meshheading:19157552-Retinal Pigment Epithelium, pubmed-meshheading:19157552-Tissue Distribution
pubmed:year
2009
pubmed:articleTitle
Bacterial endotoxin activates retinal pigment epithelial cells and induces their degeneration through IL-6 and IL-8 autocrine signaling.
pubmed:affiliation
Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, PA, USA.
pubmed:publicationType
Journal Article, Comparative Study