scholarly journals Activation of Intercellular Adhesion Molecule 1 Expression by Helicobacter pylori Is Regulated by NF-κB in Gastric Epithelial Cancer Cells

2000 ◽  
Vol 68 (4) ◽  
pp. 1806-1814 ◽  
Author(s):  
Naoki Mori ◽  
Akihiro Wada ◽  
Toshiya Hirayama ◽  
Thomas P. Parks ◽  
Christian Stratowa ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Epithelial Cells ◽  
Adhesion Molecule ◽  
Intercellular Adhesion ◽  
Intercellular Adhesion Molecule ◽  
Luciferase Reporter ◽  
Pyrrolidine Dithiocarbamate ◽  
Mrna Levels ◽  
Intercellular Adhesion Molecule 1 ◽  
H Pylori

ABSTRACT Interactions between leukocytes and epithelial cells may play a key role in Helicobacter pylori-associated gastric mucosal inflammation. This process is mediated by various cell adhesion molecules. The present study examined the molecular mechanisms leading to H. pylori-induced epithelial cell intercellular adhesion molecule-1 (ICAM-1; also called CD54) expression. Coculture of epithelial cells with cytotoxin-associated gene pathogenicity island-positive (cag PAI+) H. pylori strains, but not with a cag PAI−strain or H. pylori culture supernatants, resulted in upregulation of steady-state mRNA levels and cell surface expression of ICAM-1. Coculture with H. pylori induced an increase in luciferase activity in cells which were transfected with a luciferase reporter gene linked to the 5′-flanking region of the ICAM-1 gene.H. pylori activated the ICAM-1 promoter via the NF-κB binding site. An inducible nuclear protein complex bound to the ICAM-1 NF-κB site and was identified as the NF-κB p50–p65 heterodimer.H. pylori induced the degradation of IκB-α, a major cytoplasmic inhibitor of NF-κB, and stimulated the expression of IκB-α mRNA. Pretreatment of epithelial cells with pyrrolidine dithiocarbamate, which blocks NF-κB activation, inhibited H. pylori-induced ICAM-1 expression. THP-1 macrophagic cells, peripheral blood mononuclear cells, and purified neutrophils adhered toH. pylori-infected epithelial cells to a greater extent than to uninfected cells. These results show that H. pyloridirectly induces expression of ICAM-1 on gastric epithelial cells in an NF-κB-dependent manner that may support leukocyte attachment during inflammation.

Selective induction of intercellular adhesion molecule-1 by interferon-gamma in human airway epithelial cells

1992 ◽  
Vol 263 (1) ◽  
pp. L79-L87 ◽  
Author(s):  
D. C. Look ◽  
S. R. Rapp ◽  
B. T. Keller ◽  
M. J. Holtzman
Keyword(s):  
Epithelial Cells ◽  
Interferon Gamma ◽  
Adhesion Molecule ◽  
Airway Epithelial Cells ◽  
Intercellular Adhesion ◽  
Intercellular Adhesion Molecule ◽  
Tnf Alpha ◽  
Mrna Levels ◽  
Intercellular Adhesion Molecule 1 ◽  
Ifn Gamma

To evaluate the factors controlling migration of leukocytes into pulmonary airway epithelium, we determined the biochemical mechanisms responsible for the regulation of intercellular adhesion molecule-1 (ICAM-1) expression on cultured monolayers of human tracheal epithelial cells (HTECs) or SV40 virus-transformed human bronchial epithelial cells (BEAS-2B). Validation experiments with human umbilical vein endothelial cells (HUVECs) demonstrated little detectable ICAM-1 expression on unstimulated cells or on cells incubated with interferon-gamma (IFN-gamma), but HUVEC monolayers responded to interleukin-1 beta (IL-1 beta) or tumor necrosis factor-alpha (TNF-alpha) with significant increases in ICAM-1 and ICAM-1-dependent adherence of polymorphonuclear leukocytes (PMNs). HTEC monolayers also exhibited no significant basal ICAM-1 expression but, in contrast to HUVEC monolayers, had marked increases in ICAM-1 expression and ICAM-1-dependent PMN adherence only after incubation with IFN-gamma (and not after IL-1 beta or TNF-alpha) treatment. BEAS-2B cells also exhibited relatively selective IFN-gamma stimulation of ICAM-1 expression and ICAM-1-dependent PMN adherence but (like late passage HTEC) showed significant basal ICAM-1 expression. Differences in IFN-gamma effect on ICAM-1 levels between HUVEC and HTEC monolayers were not due to differences in number or responsiveness of IFN-gamma receptors, because both cell types exhibited a similar number of receptors and other IFN-gamma-dependent responses of HUVECs remained active. In all analyses, ICAM-1 mRNA levels correlated closely with detection of ICAM-1 on the cell surface.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Interleukin-8 and Intercellular Adhesion Molecule 1 Regulation in Oral Epithelial Cells by Selected Periodontal Bacteria: Multiple Effects of Porphyromonas gingivalis via Antagonistic Mechanisms

2001 ◽  
Vol 69 (3) ◽  
pp. 1364-1372 ◽  
Author(s):  
George T.-J. Huang ◽  
Daniel Kim ◽  
Jonathan K.-H. Lee ◽  
Howard K. Kuramitsu ◽  
Susan Kinder Haake
Keyword(s):  
Epithelial Cells ◽  
Porphyromonas Gingivalis ◽  
Adhesion Molecule ◽  
Intercellular Adhesion ◽  
Interleukin 8 ◽  
Intercellular Adhesion Molecule ◽  
Mrna Levels ◽  
Periodontal Pathogens ◽  
Intercellular Adhesion Molecule 1 ◽  
Gingival Epithelial Cells

ABSTRACT Interaction of bacteria with mucosal surfaces can modulate the production of proinflammatory cytokines and adhesion molecules produced by epithelial cells. Previously, we showed that expression of interleukin-8 (IL-8) and intercellular adhesion molecule 1 (ICAM-1) by gingival epithelial cells increases following interaction with several putative periodontal pathogens. In contrast, expression of IL-8 and ICAM-1 is reduced after Porphyromonas gingivalis ATCC 33277 challenge. In the present study, we investigated the mechanisms that govern the regulation of these two molecules in bacterially infected gingival epithelial cells. Experimental approaches included bacterial stimulation of gingival epithelial cells by either a brief challenge (1.5 to 2 h) or a continuous coculture throughout the incubation period. The kinetics of IL-8 and ICAM-1 expression following brief challenge were such that (i) secretion of IL-8 by gingival epithelial cells reached its peak 2 h following Fusobacterium nucleatum infection whereas it rapidly decreased within 2 h after P. gingivalis infection and remained decreased up to 30 h and (ii) IL-8 and ICAM-1 mRNA levels were up-regulated rapidly 2 to 4 h postinfection and then decreased to basal levels 8 to 20 h after infection with either Actinobacillus actinomycetemcomitans, F. nucleatum, or P. gingivalis. Attenuation of IL-8 secretion was facilitated by adherent P. gingivalis strains. The IL-8 secreted from epithelial cells after F. nucleatum stimulation could be down-regulated by subsequent infection with P. gingivalisor its culture supernatant. Although these results suggested that IL-8 attenuation at the protein level might be associated with P. gingivalis proteases, the Arg- and Lys-gingipain proteases did not appear to be solely responsible for IL-8 attenuation. In addition, while P. gingivalis up-regulated IL-8 mRNA expression, this effect was overridden when the bacteria were continuously cocultured with the epithelial cells. The IL-8 mRNA levels in epithelial cells following sequential challenge with P. gingivalis andF. nucleatum and vice versa were approximately identical and were lower than those following F. nucleatum challenge alone and higher than control levels or those following P. gingivalis challenge alone. Thus, together with the protease effect, P. gingivalis possesses a powerful strategy to ensure the down-regulation of IL-8 and ICAM-1.

scholarly journals The Pleiotropic Effects of Atorvastatin on Stable Angina Patients: Evidence by Analysis of High-Density Lipoprotein Size and Subclasses, and Plasma mRNA / Plejotropni Efekti Atorvastatina Kod Pacijenata Sa Stabilnom Anginom: Dokazi Dobijeni Analizom Veličine I Raspodele Subfrakcija Lipoproteina Velike Gustine I Plazmatske mRna

2015 ◽  
Vol 34 (3) ◽  
pp. 314-322 ◽  
Author(s):  
Bosa Mirjanić-Azarić ◽  
Zorana Jelić-Ivanović ◽  
Aleksandra Zeljković ◽  
Jelena Vekić ◽  
Günther Jürgens ◽  
...  
Keyword(s):  
Adhesion Molecule ◽  
Stable Angina ◽  
Intercellular Adhesion ◽  
Pleiotropic Effects ◽  
Intercellular Adhesion Molecule ◽  
Cathepsin S ◽  
Mrna Levels ◽  
Intercellular Adhesion Molecule 1 ◽  
Group A ◽  
Group B

SummaryBackground: High-density lipoproteins (HDL) have atheroprotective biological properties: antioxidative, anti-apoptotic, anti-inflammatory, and they have the efflux capacity of cellular cholesterol. Plasma mRNA analysis can be used to investigate statin pleiotropy in vivo as a new analytical tool for non-invasive assessment of gene expression in vascular beds. The aim of this study was to assess the pleiotropic effects of atorvastatin in stable angina patients with highrisk values (group A) as compared with patients who had borderline and desirable HDL-cholesterol (HDL-C) values (group B).Methods: The atorvastatin therapy (20 mg/day) was given to forty-three patients with stable angina for 10 weeks. We investigated three statin pleiotropy-targeted genes: intercellular adhesion molecule-1, chemokine (C-C motif) ligand 2 and cathepsin S and assessed by gel electrophoresis gradient the effects of atorvastatin on HDL size and subclasses.Results: In group A, after therapy, HDL-C concentration was significantly increased but not in group B. Atorvastatin lowered plasma chemokine (C-C motif) ligand 2 and intercellular adhesion molecule-1 mRNA levels in both groups, but did not change the plasma cathepsin S mRNA levels. In group A only, baseline total bilirubin showed negative cor relations with the genes of cathepsin S (r=-0.506; p=0.023) and significantly increased after therapy.Conclusion: HDL-C and bilirubin can be promising therapeutic targets in the treatment of cardiovascular diseases. Analysis of cell-free mRNA in plasma might become a useful tool for estimating statin pleiotropy

scholarly journals Surface Expression of Intercellular Adhesion Molecule 1 on Epithelial Cells in the Human Adenoid

1997 ◽  
Vol 176 (2) ◽  
pp. 523-525 ◽  
Author(s):  
B. Winther ◽  
J. M. Greve ◽  
J. M. Gwaltney, Jr. ◽  
D. J. Innes ◽  
J. R. Eastham ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Adhesion Molecule ◽  
Surface Expression ◽  
Intercellular Adhesion ◽  
Intercellular Adhesion Molecule ◽  
Intercellular Adhesion Molecule 1
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