Innate Immune Collectin Surfactant Protein D Enhances the Clearance of DNA by Macrophages and Minimizes Anti-DNA Antibody Generation
Dying microbes and necrotic cells release highly viscous DNA that induces inflammation and septic shock, and apoptotic cells display DNA, a potential autoantigen, on their surfaces. However, innate immune proteins that mediate the clearance of free DNA and surface DNA-containing cells are not clearl...
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Veröffentlicht in: | The Journal of immunology (1950) 2005-06, Vol.174 (11), p.7352-7358 |
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description | Dying microbes and necrotic cells release highly viscous DNA that induces inflammation and septic shock, and apoptotic cells display DNA, a potential autoantigen, on their surfaces. However, innate immune proteins that mediate the clearance of free DNA and surface DNA-containing cells are not clearly established. Pulmonary surfactant proteins (SP-) A and D are innate immune pattern recognition collectins that contain fibrillar collagen-like regions and globular carbohydrate recognition domains (CRDs). We have recently shown that collectins SP-A, SP-D, and mannose binding lectin recognize DNA and RNA via their collagen-like regions and CRDs. Here we show that SP-D enhances the uptake of Cy3-labeled fragments of DNA and DNA-coated beads by U937 human monocytic cells, in vitro. Analysis of DNA uptake by freshly isolated mouse alveolar macrophages shows that SP-D, but not SP-A, deficiency results in reduced clearance of DNA, ex vivo. Analysis of bronchoalveolar lavage fluid shows that SP-D- but not SP-A-deficient mice are defective in clearing free DNA from the lung. Additionally, both SP-A- and SP-D-deficient mice accumulate anti-DNA Abs in sera in an age-dependent manner. Thus, we conclude that collectins such as SP-A and SP-D reduce the generation of anti-DNA autoantibody, which may be explained in part by the defective clearance of DNA from the lungs in the absence of these proteins. Our findings establish two new roles for these innate immune proteins and that SP-D enhances efficient pinocytosis and phagocytosis of DNA by macrophages and minimizes anti-DNA Ab generation. |
doi_str_mv | 10.4049/jimmunol.174.11.7352 |
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Analysis of DNA uptake by freshly isolated mouse alveolar macrophages shows that SP-D, but not SP-A, deficiency results in reduced clearance of DNA, ex vivo. Analysis of bronchoalveolar lavage fluid shows that SP-D- but not SP-A-deficient mice are defective in clearing free DNA from the lung. Additionally, both SP-A- and SP-D-deficient mice accumulate anti-DNA Abs in sera in an age-dependent manner. Thus, we conclude that collectins such as SP-A and SP-D reduce the generation of anti-DNA autoantibody, which may be explained in part by the defective clearance of DNA from the lungs in the absence of these proteins. 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M</creatorcontrib><title>Innate Immune Collectin Surfactant Protein D Enhances the Clearance of DNA by Macrophages and Minimizes Anti-DNA Antibody Generation</title><title>The Journal of immunology (1950)</title><addtitle>J Immunol</addtitle><description>Dying microbes and necrotic cells release highly viscous DNA that induces inflammation and septic shock, and apoptotic cells display DNA, a potential autoantigen, on their surfaces. However, innate immune proteins that mediate the clearance of free DNA and surface DNA-containing cells are not clearly established. Pulmonary surfactant proteins (SP-) A and D are innate immune pattern recognition collectins that contain fibrillar collagen-like regions and globular carbohydrate recognition domains (CRDs). We have recently shown that collectins SP-A, SP-D, and mannose binding lectin recognize DNA and RNA via their collagen-like regions and CRDs. Here we show that SP-D enhances the uptake of Cy3-labeled fragments of DNA and DNA-coated beads by U937 human monocytic cells, in vitro. Analysis of DNA uptake by freshly isolated mouse alveolar macrophages shows that SP-D, but not SP-A, deficiency results in reduced clearance of DNA, ex vivo. Analysis of bronchoalveolar lavage fluid shows that SP-D- but not SP-A-deficient mice are defective in clearing free DNA from the lung. Additionally, both SP-A- and SP-D-deficient mice accumulate anti-DNA Abs in sera in an age-dependent manner. Thus, we conclude that collectins such as SP-A and SP-D reduce the generation of anti-DNA autoantibody, which may be explained in part by the defective clearance of DNA from the lungs in the absence of these proteins. 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Thus, we conclude that collectins such as SP-A and SP-D reduce the generation of anti-DNA autoantibody, which may be explained in part by the defective clearance of DNA from the lungs in the absence of these proteins. Our findings establish two new roles for these innate immune proteins and that SP-D enhances efficient pinocytosis and phagocytosis of DNA by macrophages and minimizes anti-DNA Ab generation.</abstract><cop>United States</cop><pub>Am Assoc Immnol</pub><pmid>15905582</pmid><doi>10.4049/jimmunol.174.11.7352</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Adjuvants, Immunologic - deficiency Adjuvants, Immunologic - genetics Adjuvants, Immunologic - metabolism Adjuvants, Immunologic - physiology Animals Antibodies, Antinuclear - biosynthesis Antibodies, Antinuclear - blood Autoantigens - immunology Autoantigens - metabolism DNA - immunology DNA - metabolism Humans Immunity, Innate - genetics Lung - immunology Lung - metabolism Macrophages - immunology Macrophages - metabolism Mice Mice, Inbred C57BL Mice, Knockout Pinocytosis - genetics Pinocytosis - immunology Plasmids - metabolism Pulmonary Surfactant-Associated Protein A - deficiency Pulmonary Surfactant-Associated Protein A - genetics Pulmonary Surfactant-Associated Protein D - deficiency Pulmonary Surfactant-Associated Protein D - genetics Pulmonary Surfactant-Associated Protein D - metabolism Pulmonary Surfactant-Associated Protein D - physiology U937 Cells |
title | Innate Immune Collectin Surfactant Protein D Enhances the Clearance of DNA by Macrophages and Minimizes Anti-DNA Antibody Generation |
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