SEARCH:   Advanced

Blood, 1 November 2007, Vol. 110, No. 9, pp. 3253-3262. Prepublished online as a Blood First Edition Paper on August 2, 2007; DOI 10.1182/blood-2007-03-077057. This Article Full Text (PDF) All Versions of this Article: blood-2007-03-077057v1 110/9/3253    most recent Alert me when this article is cited Alert me if a correction is posted 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 Tha-In, T. Articles by Kwekkeboom, J. Search for Related Content PubMed PubMed Citation Articles by Tha-In, T. Articles by Kwekkeboom, J. Social Bookmarking                   What's this?  Previous Article  |  Next Article  Submitted March 5, 2007 Accepted July 30, 2007 Intravenous immunoglobulins suppress T-cell priming by modulating the bi-directional interaction between dendritic cells and natural killer cells Thanyalak Tha-In, Herold J. Metselaar, Hugo W. Tilanus, Zwier M.A. Groothuismink, Ernst J. Kuipers, Robert A. de Man, and Jaap Kwekkeboom* Department of Gastroenterology and Hepatology, Erasmus MC - University Medical Center, Rotterdam, Netherlands Department of Surgery, Erasmus MC - University Medical Center, Rotterdam, Netherlands * Corresponding author; email: j.kwekkeboom{at}erasmusmc.nl. The modes of action of intravenous immunoglobulins (IVIg) in exerting their immunomodulatory properties are broad and not fully understood. IVIg can modulate the function of various immune cells, including suppressing the capacity of dendritic cells (DC) to stimulate T-cells. In the present study, we showed that DC matured in presence of IVIg (IVIg-DC) activated NK-cells, and increased their interferon- production and degranulation. The activated NK-cells induced apoptosis of the majority of IVIg-DC. In consequence, only in the presence of NK-cells, IVIg-DC were 4-fold impaired in their T-cell priming capacity. This was due to NK-cell mediated Antibody Dependent Cellular Cytotoxicity (ADCC) to IVIg-DC, probably induced by IgG-multimers, which could be abrogated by blockade of CD16 on NK-cells. Furthermore, IVIg-DC down regulated the expression of NKp30 and KIR-receptors, and induced the generation of CD56brightCD16-CCR7+ lymph node type NK-cells. Our results identify a novel pathway, in which IVIg induce ADCC of mature DC by NK-cells, which downsizes the antigen presenting pool and inhibits T-cell priming. By influencing the interaction between DC and NK-cells, IVIg modulate the ability of the innate immunity to trigger T-cell activation, a mechanism that can "cool down" the immune system at times of activation. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: A. Iannello, O. Debbeche, S. Samarani, and A. Ahmad Antiviral NK cell responses in HIV infection: II. viral strategies for evasion and lessons for immunotherapy and vaccination J. Leukoc. Biol., July 1, 2008; 84(1): 27 - 49. [Abstract] [Full Text] [PDF]

	Copyright © 2007 by American Society of Hematology         Online ISSN: 1528-0020