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This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Hackstein, H. Articles by Thomson, A. W. Search for Related Content PubMed PubMed Citation Articles by Hackstein, H. Articles by Thomson, A. W. Related Collections Immunobiology Phagocytes Brief Reports Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 August 2002, Vol. 100, No. 3, pp. 1084-1087 BRIEF REPORT Rapamycin inhibits macropinocytosis and mannose receptor-mediated endocytosis by bone marrow-derived dendritic cells Holger Hackstein, Timucin Taner, Alison J. Logar, and Angus W. Thomson From the Thomas E. Starzl Transplantation Institute and Department of Surgery and the Department of Molecular Genetics and Biochemistry, University of Pittsburgh, PA, and the Institute of Clinical Immunology and Transfusion Medicine, Justus-Liebig University, Giessen, Germany. Dendritic cells (DCs) are professional antigen-presenting cells (APCs) that use 2 major pathways for antigen uptake: constitutive macropinocytosis and mannose receptor-mediated endocytosis. Efficient endocytosis is critical for DCs to fulfill their sentinel function in immunity. We investigated the influence of the immunosuppressive macrolide rapamycin on macropinocytosis of fluorescein isothiocyanate (FITC)-albumin and mannose receptor-mediated endocytosis of FITC-dextran by murine bone marrow-derived DCs by flow cytometry. The data show that (1) at a low, physiologically relevant concentration (1 ng/mL), rapamycin impairs macropinocytosis and mannose receptor-mediated endocytosis; (2) the effects are independent of DC maturation and can be demonstrated specifically in immature CD11c+ major histocompatibility complex (MHC) class IIlo DCs by 3-color flow cytometry; (3) inhibition of endocytosis is not related to apoptotic cell death; and (4) molar excess of the structurally related molecule FK506 inhibits the actions of rapamycin. The inhibitory effects of rapamycin on DC endocytosis were confirmed in vivo. To our knowledge, this is the first report that a clinically relevant immunosuppressant inhibits DC endocytosis. © 2002 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: Y. Huang, M. Parker, C. Xia, R. Peng, C. Wasserfall, T. Clarke, L. Wu, T. Chowdhry, M. Campbell-Thompson, J. 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