Intercellular adhesion molecule-1 (ICAM-1) expression and cell signaling cascades.
The collective interaction between cells is, in part, mediated by different families of adhesion molecules. Intercellular adhesion molecules (ICAMs) are structurally related members of the immunoglobulin supergene family and are ligands for the beta2 integrin molecules present on leukocytes. Of the five ICAMs identified, ICAM-1 is the most extensively studied. Although ICAM-1 is expressed constitutively at low levels on endothelial cells and on some lymphocytes and monocytes, its expression can be significantly increased in the presence of cytokines (TNFalpha, IL-1, IFNgamma) and reactive oxygen species. Depending upon cell type, ICAM-1 participates in trafficking of inflammatory cells, in cell:cell interactions during antigen presentation, in microbial pathogenesis, and in signal transduction through outside-in signaling events. Again, depending upon cell type examined, ICAM-1 engagement has been documented to activate specific kinases through phosphorylation, resulting in transcription factor activation and increased cytokine production, increased cell membrane protein expression, reactive oxygen species production, and cell proliferation.
Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT 06269, USA. Hubbard@uconnvm.uconn.edu
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D000818:Animals; D017951:Antigen Presentation / Q000502:physiology; D018821:CD18 Antigens / Q000502:physiology; D002448:Cell Adhesion; D016207:Cytokines / Q000096:biosynthesis / Q000494:pharmacology; D004730:Endothelium, Vascular / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D008214:Lymphocytes / Q000187:drug effects / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000502:physiology; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism; D005810:Multigene Family; D018384:Oxidative Stress; D010766:Phosphorylation; D011499:Protein Processing, Post-Translational; D017382:Reactive Oxygen Species; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D018808:Transcription Factor AP-1 / Q000502:physiology
D018821:CD18 Antigens; D016207:Cytokines; D017382:Reactive Oxygen Species; D018808:Transcription Factor AP-1; D018799:Intercellular Adhesion Molecule-1