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pubmed-article:18166151pubmed:abstractTextNAD is available in the extracellular environment and elicits immune modulation such as T cell apoptosis by being used as the substrate of cell surface ADP-ribosyl transferase. However, it is unclear whether extracellular NAD affects function of macrophages expressing cell surface ADP-ribosyl transferase. Here we show that extracellular NAD enhances Fcgamma receptor (FcgammaR)-mediated phagocytosis in J774A.1 macrophages via the conversion into cyclic ADP-ribose (cADPR), a potent calcium mobilizer, by CD38, an ADP-ribosyl cyclase. Extracellular NAD increased the phagocytosis of IgG-coated sheep red blood cells (IgG-SRBC) in J774A.1 macrophages, which was completely abolished by pretreatment of 8-bromo-cADPR, an antagonist of cADPR, or CD38 knockdown. Extracellular NAD increased basal intracellular Ca(2+) concentration, which also was abolished by pretreatment of 8-bromo-cADPR or CD38 knockdown. Moreover, the chelation of intracellular calcium abolished NAD-induced enhancement of phagocytosis of IgG-SRBC. Our results suggest that extracellular NAD act as a regulator for FcgammaR-mediated phagocytosis in macrophages.lld:pubmed
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pubmed-article:18166151pubmed:authorpubmed-author:HanMyung-Kwan...lld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:ParkKwang-Hyu...lld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:KimUh-HyunUHlld:pubmed
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pubmed-article:18166151pubmed:authorpubmed-author:LeeSeung-JinS...lld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:SongEun-Kyung...lld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:LeeYoung-RaeY...lld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:ParkYeong-Min...lld:pubmed
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pubmed-article:18166151pubmed:authorpubmed-author:YuHong-NuHNlld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:ShimIn-KyungI...lld:pubmed
pubmed-article:18166151pubmed:authorpubmed-author:ChungWeon-Guu...lld:pubmed
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pubmed-article:18166151pubmed:year2008lld:pubmed
pubmed-article:18166151pubmed:articleTitleExtracellular NAD is a regulator for FcgammaR-mediated phagocytosis in murine macrophages.lld:pubmed
pubmed-article:18166151pubmed:affiliationDepartment of Microbiology and Immunology, Chonbuk National University Medical School, Jeonju 561-182, South Korea.lld:pubmed
pubmed-article:18166151pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18166151pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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