Document Detail


Binding of C-reactive protein to nucleated cells leads to complement activation without cytolysis.
MedLine Citation:
PMID:  3944459     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
C-reactive protein (CRP) is an acute-phase reactant that is found bound to cells at sites of inflammation. We have passively sensitized HEp-2 cells for CRP binding and examined the effect of this treatment on complement activation and cell lysis. When cells were treated with protamine sulfate and CRP and were incubated with normal human serum in a 4-hr 51Cr-release assay, no significant lysis was noted. In contrast, HEp-2 cells treated with antibody and normal human serum were lysed. The consumption of complement components in normal human serum after incubation with cells treated with protamine and CRP was measured by hemolytic assays. CRP-treated cells consumed over 80% of C1, C4, and C2 and about 40% of C3 present. No significant consumption of C5 through C9 components was observed. Cells treated with antibody and complement showed consumption of C1 through C9. Cells were also sensitized for CRP binding by using diazophenylphosphocholine. This treatment also led to CRP binding and activation of the early classical pathway (C1, C4, C2, and to a lesser extent C3). The components of the membrane attack complex (C5 through C9) were not activated. Both a mouse monoclonal IgM and a human IgG antibody to phosphocholine activated the entire classical pathway. These results indicate that CRP activation of the classical complement pathway is restricted to the early part of the pathway. In the absence of activation of the membrane attack complex, complement-mediated cell lysis cannot occur.
Authors:
S Berman; H Gewurz; C Mold
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of immunology (Baltimore, Md. : 1950)     Volume:  136     ISSN:  0022-1767     ISO Abbreviation:  J. Immunol.     Publication Date:  1986 Feb 
Date Detail:
Created Date:  1986-03-07     Completed Date:  1986-03-07     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2985117R     Medline TA:  J Immunol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1354-9     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Antibodies, Neoplasm / physiology
Binding Sites, Antibody
C-Reactive Protein / metabolism*
Carcinoma / immunology*,  metabolism
Cell Line
Complement Activation* / drug effects
Complement System Proteins / metabolism,  physiology
Cytotoxicity, Immunologic* / drug effects
Humans
Laryngeal Neoplasms / immunology*,  metabolism
Phosphorylcholine / pharmacology
Protamines / pharmacology
Protein Binding / drug effects
Rabbits
Grant Support
ID/Acronym/Agency:
AI16082/AI/NIAID NIH HHS
Chemical
Reg. No./Substance:
0/Antibodies, Neoplasm; 0/Binding Sites, Antibody; 0/Protamines; 107-73-3/Phosphorylcholine; 9007-36-7/Complement System Proteins; 9007-41-4/C-Reactive Protein

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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