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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bender, J. R. Lee, J. O'donnell, L. Ayalon, O. Cresswell, P. Pardi, R. Hughes, E. A. |
| Description | Author Affiliation: Ayalon O ( Division of Cardiovascular Medicine and Molecular Cardiobiology, Boyer Center for Molecular Medicine, The Raymond and Beverly Sackler Foundation Cardiobiology Laboratory, Yale University School of Medicine, New Haven, CT 06536-0812, USA.); |
| Abstract | T lymphocytes react minimally with nonactivated endothelial cells (ECs). However, natural killer (NK) lymphocyte interactions with resting ECs are rapid, avid, and result in endothelial activation and/or cytotoxicity. The molecular basis for these interactions and EC sensitivity to NK-mediated lysis is unclear. To address the EC-specific nature of NK sensitivity, we used syngeneic human umbilical vein ECs, dermal microvascular ECs, dermal fibroblasts, and B lymphoblastoid cell lines in calcein-AM retention NK assays with allogeneic NK effector cells and found the EC lines consistently more NK-sensitive. Because NK inhibitory receptors are engaged by membrane major histocompatibility complex (MHC) I molecules and MHC I-deficient targets are NK-sensitive, we investigated the quantitative levels of membrane MHC I on the panel of syngeneic lines. Highly sensitive ECs expressed similar (or higher) levels of membrane MHC I than their syngeneic NK-resistant counterparts. Pretreatment of ECs with gamma interferon (IFN-gamma) conferred protection against NK-mediated lysis, with much more rapid kinetics (2-6 hr) than those required for membrane MHC I hyperinduction (>8 hr). These kinetics are consistent with induction of transporter associated with antigen processing (TAP) expression and function. As opposed to NK-resistant cell lines, TAP-1 was undetectable in resting ECs. Recombinant expression of the TAP inactivator ICP47 by adenoviral-mediated transduction was used to selectively inhibit IFN-gamma-mediated EC TAP function. ICP47 expression abrogated EC cytoprotection conferred by IFN-gamma. We demonstrate a relationship between both basal and induced TAP-1 expression/function and EC sensitivity to NK-mediated cytotoxicity. We discuss the influence of an induced MHC I-associated peptide repertoire on vascular vulnerability to cytotoxic lymphocytes. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Carrier Proteins Biosynthesis Cytotoxicity, Immunologic Endothelium, Vascular Immunology Histocompatibility Antigens Class I Physiology Interferon-gamma Pharmacology Killer Cells, Natural B-Lymphocytes Cell Membrane Cells, Cultured Drug Effects Kinetics Recombinant Proteins Skin Transfection Umbilical Veins Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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