| Effects of complement regulators bound to Escherichia coli K1 and Group B Streptococcus on the interaction with host cells. | |
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MedLine Citation:
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PMID: 18028369 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Escherichia coli K1 and Group B Streptococcus (GBS) are the most common bacteria that cause meningitis during the neonatal period. Complement, the first line of defence in the host, acts on these bacteria to opsonize with various components of complement for subsequent presentation to phagocytes. To counteract these opsonization effects, E. coli and GBS bind to the complement regulators C4 binding protein and Factor H, respectively. Nonetheless, the deposition of complement components on these two bacteria from neonatal serum and their effect on the host cell interaction is unclear. Here we demonstrated that the deposition of complement proteins from adult serum prevented the invasion of E. coli into human brain microvascular endothelial cells, whereas the invasion of GBS was enhanced. In contrast, treatment with cord serum had no effect on the invasion of both these bacteria. We also examined the effect of the deposited complement proteins on phagocytosis using THP-1 cells and THP-1 cells differentiated into macrophages. Escherichia coli treated with adult serum neither attached nor entered these cells, whereas GBS was phagocytosed and survived efficiently. We further demonstrate that the inhibitory effect of complement proteins is the result of the bound complement inhibitors C4b-binding protein, in the case of E. coli, and Factor H, in the case of GBS. Taken together, these results suggest that E. coli and GBS utilize contrasting mechanisms of complement-mediated interactions with their target cells for successful establishment of disease. |
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Authors:
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Ravi Maruvada; Anna M Blom; Nemani V Prasadarao |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2007-11-20 |
Journal Detail:
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Title: Immunology Volume: 124 ISSN: 1365-2567 ISO Abbreviation: Immunology Publication Date: 2008 Jun |
Date Detail:
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Created Date: 2008-05-20 Completed Date: 2008-06-09 Revised Date: 2011-09-26 |
Medline Journal Info:
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Nlm Unique ID: 0374672 Medline TA: Immunology Country: England |
Other Details:
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Languages: eng Pagination: 265-76 Citation Subset: IM |
Affiliation:
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Division of Infectious Diseases, The Saban Research Institute, Children's Hospital Los Angeles, Los Angeles, CA 90027, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aging / immunology Blood Bactericidal Activity Brain / blood supply, immunology, microbiology Complement Factor H / metabolism Complement System Proteins / metabolism* Endothelial Cells / immunology, microbiology Endothelium, Vascular / immunology, microbiology Escherichia coli / metabolism*, pathogenicity Fetal Blood / immunology Histocompatibility Antigens / metabolism Humans Infant, Newborn Phagocytosis Streptococcus agalactiae / metabolism*, pathogenicity Virulence / immunology |
| Grant Support | |
ID/Acronym/Agency:
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AI40567/AI/NIAID NIH HHS; R01 AI040567-13/AI/NIAID NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/C4BPA protein, human; 0/Histocompatibility Antigens; 80295-65-4/Complement Factor H; 9007-36-7/Complement System Proteins |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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