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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Winning, Sandra Frede, Stilla Splettstoesser, Frank Fandrey, Joachim |
| Description | Country affiliation: Germany Author Affiliation: Winning S ( Institut für Physiologie, Universität Duisburg-Essen, Essen, Germany.) |
| Abstract | Myeloid cells recruited to sites of bacterial inflammation are exposed to low oxygen tension, hypoxia, and high concentrations of inflammatory cytokines that significantly affect myeloid cell function. Therefore, we analyzed the direct consequences of acute and severe hypoxia on monocytic adhesion to the endothelium in coculture experiments. Marked upregulation of monocytic ICAM-1, but no other monocytic adhesion molecule, was responsible for an approximately 50-fold increase in adhesion of the monocytic cells THP-1 to human and rat endothelial cells. ICAM-1 expression was rapidly induced after the onset of severe hypoxia, but it decreased after 4 h. Knockdown of ICAM-1 by siRNA in endothelial and monocytic cells abolished the adhesion, indicating that ICAM-1 expression on both cell types was indispensable for hypoxia-induced adhesion of monocytes to the endothelium. siRNA-mediated knockdown of hypoxia inducible factor (HIF)-1alpha, HIF-2alpha, and the NF-kappaB family member p65 revealed that hypoxic upregulation of ICAM-1 resulted from hypoxic NF-kappaB induction but not from activation of HIFs. Within the leukocyte-adhesion cascade, our results provide evidence for prolyl hydroxylase-dependent but HIF-independent activation of hypoxia-induced monocyte-endothelial adhesion and assign a new function to monocytic ICAM-1 under acute hypoxic conditions. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| Journal | The Journal of Immunology |
| Issue Number | 3 |
| Volume Number | 185 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2010-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Hypoxia Immunology Endothelium, Vascular Cytology Hypoxia-inducible Factor 1, Alpha Subunit Physiology Intercellular Adhesion Molecule-1 Biosynthesis Monocytes Nf-kappa B Procollagen-proline Dioxygenase Antagonists & Inhibitors Acute Disease Amino Acids, Dicarboxylic Pharmacology Animals Basic Helix-loop-helix Transcription Factors Cell Adhesion Cell Line Cell Line, Tumor Coculture Techniques Enzymology Enzyme Activation Drug Effects Genetics Metabolism Rna, Messenger Up-regulation Research Support, Non-u.s. Gov't Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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