Linked Life Data

2539182

Source:http://linkedlifedata.com/resource/pubmed/id/2539182

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pubmed-article:2539182pubmed:abstractTextEight monoclonal antibodies (mabs) to the Rh antigen D produced by Epstein-Barr virus transformed B-lymphoblastoid cell lines from two individuals have been compared for their behaviour in in vitro cell-mediated assays. Three IgG1 Glm(1,17) and two IgG3 G3m(21) mabs from one donor and three IgG1 Glm(3) mabs from another were used. IgG3 anti-D mabs induced greater adherence and phagocytosis of sensitized red cells by U937 monocytes than IgG1 anti-D mabs or the polyclonal anti-D. Minimum sensitization levels for rosetting and phagocytosis by U937 monocytes were 2,000 molecules IgG/cell for IgG3 and 5,000 molecules/cell for IgG1 mabs; maximum rosetting mediated by both IgG1 and IgG3 mabs was obtained at 15,000-20,000 molecules/cell. The IgG3 anti-D mabs were comparable to polyclonal anti-D in mediating binding of sensitized red cells to gamma-interferon stimulated monocyte-derived cultured macrophages and were markedly more effective than the IgG1 anti-D mabs. However, in lymphocyte ADCC assays, only anti-D mabs which were IgG1 Glm(3) were effective in mediating high levels of lysis of sensitized red cells, unlike the IgG1 Glm (1,17) or IgG3 G3m(21) mabs. Minimum sensitization levels required for this lymphocyte-mediated red cell lysis were found to be approximately 5,000 molecules/cell with one IgG1 Glm(3) mab; maximum lysis with this mab was obtained at 10,000 molecules/cell. Polyclonal anti-D containing both IgG1 and IgG3 was effective in all three assays. These observations suggest that different isotypes and allotypes of anti-D antibodies mediate red cell removed or destruction by monocyte or lymphocyte effector cell through functionally dissimilar Fc receptor interactions.lld:pubmed
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pubmed-article:2539182pubmed:authorpubmed-author:BradleyB ABAlld:pubmed
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pubmed-article:2539182pubmed:pagination415-20lld:pubmed
pubmed-article:2539182pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:2539182pubmed:year1989lld:pubmed
pubmed-article:2539182pubmed:articleTitleHuman monoclonal anti-D antibodies. II. The relationship between IgG subclass, Gm allotype and Fc mediated function.lld:pubmed
pubmed-article:2539182pubmed:affiliationU.K. Transplant Service, Bristol.lld:pubmed
pubmed-article:2539182pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2539182pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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