CD200-dependent and nonCD200-dependant pathways of NK cell suppression by human IVIG
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Intravenous immunoglobulin (IVIG) has been used to suppress autoimmune and inflammatory disorders by a variety of mechanisms. Recently, the CD200 tolerance-promoting signal has been found to play a role in IVIG suppression of blood natural killer (NK) cells. Further, different types of IVIG have been reported to differ in this activity, and that has been related to efficacy (and inefficacy) of treatment of women with pregnancy failure. CD200 acts by binding to CD200 receptors (C200R). The objective of this study was to determine if CD200-dependent NK suppression by IVIG involved direct binding of IVIG-associated CD200 molecules to CD200R on NK cells.
Method of study
Peripheral Blood Lymphocytes isolated from human blood were used as a source of NK cells to lyse Cr51-labelled K562 target cells in vitro in 18 and 4 h assays, and three different types of IVIG were tested for suppressive activity in the presence or absence of specific monoclonal anti-huCD200. In some experiments, CD56+ NK cells were purified using anti-CD56 magnetic beads. Western blotting of IVIG using a specific anti-huCD200 antibody was done. Enzyme-Linked ImmunoSorbent Assays were used to measure cytokine production in NK assays.
Different IVIGs showed significant differences in potency in suppressing NK cytolytic activity in vitro (mg/ml for 60% suppression, Gammagard 4.1, Gamunex 14.1, Gamimmune 20.2). For CD200-dependent suppression, Gammagard was twice as potent as Gamimmune, but equivalent to Gamunex. The presence of suppression in 4 hour assays indicated stimulation of cytokine synthesis was unlikely to explain CD200-dependent suppression. Purification of NK cells led to loss of the CD200-dependent component. Western blotting confirmed that material reactive with anti-CD200 antibody was present in Immunoglobulin G (IgG) preparations, and at a lower level in human serum that contains IgG.
IVIGs are not all equipotent in suppressing NK cell cytolytic activity. CD200 associated with IVIG is an important component of suppression. CD200-dependent suppression appears to be mediated by a non-NK population that then acts on NK cells by direct contact rather than indirectly through release of immunosuppressive cytokines.
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- CD200-dependent and nonCD200-dependant pathways of NK cell suppression by human IVIG
Journal of Assisted Reproduction and Genetics
Volume 25, Issue 2-3 , pp 67-72
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- NK cells
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- Author Affiliations
- 1. Departments of Medicine, Pathology and Molecular Medicine, McMaster University, 1200 Main St. West., Hamilton, ON, L8N 3Z5, Canada
- 2. Toronto General Research Institute, Toronto Hospital, Toronto, ON, Canada
- 3. Department of Surgery, University of Toronto, Toronto, ON, Canada
- 4. Transfusion Medicine, Canadian Blood Services, Hamilton Health Sciences, Hamilton, ON, Canada