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      Microvascular Endothelial Cells Differ in Their Basal and Tumour Necrosis Factor-α-Regulated Expression of Adhesion Molecules and Cytokines

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          Abstract

          We recently located a rare cytokeratin-positive (CK+) type of microvascular endothelial cell (MVEC) in the corpus luteum and aorta. Bovine corpus luteum MVEC are known to be involved in the cyclic accumulation of eosinophils and macrophages. Since leukocyte migration is specifically mediated by adhesion molecules and the release of cytokines, we compared the expression of these factors in basal and TNF-α-stimulated CK+ MVEC and in common cytokeratin-negative (CK–) MVEC in order to obtain an initial insight into the functional capacities of CK+ MVEC. CK– MVEC revealed significantly higher basal RANTES mRNA expression than CK+ MVEC, and TNF- α up-regulated RANTES mRNA in both types of MVEC. Only resting and stimulated CK– MVEC expressed granulocyte-macrophage colony-stimulating factor mRNA. Both MVEC types expressed monocyte colony-stimulating factor mRNA, but remained negative for eotaxin and interleukin (IL)-5 mRNA even after stimulation. Resting CK+ MVEC were positive for CD29, CD31, CD49a and CD49e, but expressed most of these antigens at a significantly lower density than did CK– MVEC. In contrast to CK– MVEC, CK+ MVEC failed to express CD49b or MHC class II. The activation of CK+ MVEC with TNF-α induced the expression of CD62P, but not of CD49b or MHC class II. In summary, phenotypically variable MVEC derived from the microvascular bed of one organ differ in their TNF-α-regulated expression of cytokine mRNA and adhesion molecules. Morphological heterogeneity is related to a particular specialisation of functional MVEC.

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          Most cited references 2

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          Human eotaxin is a specific chemoattractant for eosinophil cells and provides a new mechanism to explain tissue eosinophilia.

          Eotaxin is an eosinophil-specific chemoattractant that has been recently identified in rodent models of asthma and host response against tumors. To determine whether a similar molecule might play a role in human inflammatory diseases characterized by eosinophilia, we isolated the human eotaxin gene. We demonstrate that human eotaxin is an early response gene of cytokine-stimulated epithelial and endothelial cells, and is induced in peripheral blood eosinophils by interleukin-3. Eotaxin is directly chemotactic for eosinophils, but not mononuclear cells or neutrophils. Eotaxin messenger RNA accumulates markedly in the lesions of patients with inflammatory bowel disease (ulcerative colitis and Crohn's disease), but not in the lesions of patients with diverticulitis. These results now provide a mechanism involving eotaxin to explain the eosinophil infiltration seen in a variety of human disease; as such, an eotaxin antagonist may be a novel therapy for certain human diseases characterized by tissue eosinophilia.
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            Human endothelium as a source of multifunctional cytokines: molecular regulation and possible role in human disease.

            Endothelial cells, by virtue of their capacity to express adhesion molecules and cytokines, are intricately involved in inflammatory processes. Endothelial cells have been shown to express interleukin-1 (IL-1), IL-5, IL-6, IL-8, IL-11, IL-15, several colony-stimulating factors (CSF), granulocyte-CSF (G-CSF), macrophage CSF (M-CSF) and granulocyte-macrophage CSF (GM-CSF), and the chemokines, monocyte chemotactic protein-1 (MCP-1), RANTES, and growth-related oncogene protein-alpha (GRO-alpha). IL-1 and tumor necrosis factor-alpha (TNF-alpha) produced by infiltrating inflammatory cells can induce endothelial cells to express several of these cytokines as well as adhesion molecules. Induction of these cytokines in endothelial cells has been demonstrated by such diverse processes as hypoxia and bacterial infection. Recent studies have demonstrated that adhesive interactions between endothelial cells and recruited inflammatory cells can also signal the secretion of inflammatory cytokines. This cross-talk between inflammatory cells and the endothelium may be critical to the development of chronic inflammatory states. Endothelial-derived cytokines may be involved in hematopoiesis, cellular chemotaxis and recruitment, bone resorption, coagulation, and the acute-phase protein synthesis. As many of these processes are critical to the maturation of an inflammatory and reparative state, it appears likely that endothelial-derived cytokines play a crucial role in several diseases, including atherosclerosis, graft rejection, asthma, vasculitis, and sepsis. Genetic and pharmacologic manipulation of endothelial-derived cytokines provides an additional approach to the management of chronic inflammatory diseases.
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              Author and article information

              Journal
              JVR
              J Vasc Res
              10.1159/issn.1018-1172
              Journal of Vascular Research
              S. Karger AG
              1018-1172
              1423-0135
              2000
              October 2000
              02 October 2000
              : 37
              : 5
              : 408-416
              Affiliations
              aInstitute of Clinical Immunology and Transfusion Medicine, bInstitute of Anatomy, University of Leipzig, Leipzig, Germany
              Article
              25757 J Vasc Res 2000;37:408–416
              10.1159/000025757
              11025404
              © 2000 S. Karger AG, Basel

              Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

              Page count
              Figures: 3, Tables: 2, References: 34, Pages: 9
              Categories
              Research Paper

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