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      Correlations among expression of glomerular intercellular adhesion molecule 1 (ICAM-1), levels of serum soluble ICAM-1, and renal histopathology in patients with IgA nephropathy.

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          Abstract

          The purpose of the present study was to evaluate the correlations among expression of intercellular adhesion molecule 1 (ICAM-1) in glomeruli, levels of soluble ICAM-1 (sICAM-1) in sera, and renal injuries in patients with IgA nephropathy. The levels of sICAM-1 in sera from 27 patients with IgA nephropathy and 7 healthy controls were measured by the human soluble ICAM-1 immunoassay. The expression of ICAM-1 in glomeruli was detected by indirect immunofluorescence. We observed marked expression of ICAM-1 in glomerular capillary walls and mesangial areas in patients with advanced-stage, but not in those with mild IgA nephropathy. Since the histopathological changes in the advanced stage of this disease were characterized by diffuse mesangial cell proliferation and tubulointerstitial injury, the expression of ICAM-1 in the glomeruli may be of value in evaluating the degree of renal lesions in patients with IgA nephropathy. However, there was no significant change in the levels of serum sICAM-1 among mild-stage and advanced-stage patients and healthy controls. It appears that the measurement of serum sICAM-1 is not useful in evaluating the degree of renal injuries in patients with IgA nephropathy.

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          A cell adhesion molecule, ICAM-1, is the major surface receptor for rhinoviruses.

          Rhinoviruses, which cause common colds, possess over 100 serotypes, 90% of which (the major group) share a single receptor. Lymphocyte function associated molecule 1 (LFA-1) mediates leukocyte adhesion to a wide variety of cell types by binding to intercellular adhesion molecule 1 (ICAM-1). We demonstrate identity between the receptor for the major group of rhinoviruses and ICAM-1. A major group rhinovirus binds specifically to purified ICAM-1 and to ICAM-1 expressed on transfected COS cells, and binding is blocked by three ICAM-1 monoclonal antibodies (MAb) that block ICAM-1-LFA-1 interaction, but not by an ICAM-1 MAb that does not block ICAM-1-LFA-1 interaction. This suggests that the ICAM-1 contact site(s) for LFA-1 and rhinoviruses is proximal or identical. In addition, ICAM-1 MAb block the cytopathic effect in HeLa cells mediated by representative major but not minor group rhinoviruses. ICAM-1 is induced by soluble mediators of inflammation, suggesting that the host immune response to rhinovirus may facilitate spread to uninfected cells.
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            Purified intercellular adhesion molecule-1 (ICAM-1) is a ligand for lymphocyte function-associated antigen 1 (LFA-1).

            Lymphocyte function-associated antigen 1 (LFA-1) is a leukocyte cell surface glycoprotein that promotes intercellular adhesion in immunological and inflammatory reactions. It is an alpha beta complex that is structurally related to receptors for extracellular matrix components, and thus belongs to the integrin family. ICAM-1 (intercellular adhesion molecule-1) is a distinct cell surface glycoprotein. Its broad distribution, regulated expression in inflammation, and involvement in LFA-1-dependent cell-cell adhesion have suggested that ICAM-1 may be a ligand for LFA-1. We have purified ICAM-1 and incorporated it into artificial supported lipid membranes. LFA-1+ but not LFA-1- cells bound to ICAM-1 in the artificial membranes, and the binding could be specifically inhibited by anti-ICAM-1 treatment of the membranes or by anti-LFA-1 treatment of the cells. The cell binding to ICAM-1 required metabolic energy production, an intact cytoskeleton, and the presence of Mg2+ and was temperature dependent, characteristics of LFA-1- and ICAM-1-dependent cell-cell adhesion.
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              Author and article information

              Journal
              Am. J. Nephrol.
              American journal of nephrology
              S. Karger AG
              0250-8095
              0250-8095
              1999
              : 19
              : 4
              Affiliations
              [1 ] Division of Nephrology, Department of Medicine, Juntendo University School of Medicine, Tokyo, Japan.
              Article
              13505
              10.1159/000013505
              10460941
              c7d7ab41-1d2a-4f02-aa68-0a5ea3c90b78
              History

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