Document Detail

Monoclonal antibodies against enterotoxigenic Escherichia coli colonization factor antigen I (CFA/I) that cross-react immunologically with heterologous CFAs.
MedLine Citation:
PMID:  7927693     Owner:  NLM     Status:  MEDLINE    
Enterotoxigenic Escherichia coli binds to enterocytes in the small intestine by means of antigenically distinct colonization factors (CFs), usually termed colonization factor antigens (CFAs), coli surface antigens (CS), or putative colonization factor antigens (PCFs). To explore the immunological relationship between different CFs, we dissociated CFA/I fimbriae into subunits and produced monoclonal antibodies (MAbs) against these subunits. We selected three MAbs that cross-reacted immunologically with a number of different, whole purified CFs in a dot blot test and with the corresponding subunits in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. One of the MAbs, i.e., subunit CFA/I 17:8 (S-CFA/I 17:8), reacted more strongly with subunits of CFA/I than with whole purified fimbriae. This MAb cross-reacted with whole purified fimbriae and subunits of CS4, PCFO166, CS1, and CS2. Moreover, it bound strongly to a peptide of 25 amino acids corresponding to the N-terminal end of CFA/I. The other two MAbs, i.e., S-CFA/I 5:6 and S-CFA/I 8:11, cross-reacted with CS1, CS2, CS4, PCFO166, and CS17 fimbriae but reacted only slightly or not at all with the CFA/I peptide. MAbs S-CFA/I 17:8 and S-CFA/I 5:6 were shown to inhibit hemagglutination by bacterial strains that express either CFA/I, CS1, or CS4. In addition, the binding of enterotoxigenic E. coli strains expressing CFA/I, CS2, CS4, and PCFO166 to enterocyte-like cell-line Caco-2 was inhibited by both MAbs. These results show that several antigenically different CFs have common epitopes and that among these at least one is located in the N-terminal end of the subunit protein. Moreover, antibodies against the common epitopes seem to block binding of the bacterial strains that express different CFs to both erythrocytes and Caco-2 cells.
A Rudin; M M McConnell; A M Svennerholm
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Infection and immunity     Volume:  62     ISSN:  0019-9567     ISO Abbreviation:  Infect. Immun.     Publication Date:  1994 Oct 
Date Detail:
Created Date:  1994-11-04     Completed Date:  1994-11-04     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0246127     Medline TA:  Infect Immun     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  4339-46     Citation Subset:  IM    
Department of Medical Microbiology and Immunology, University of Göteborg, Sweden.
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MeSH Terms
Antibodies, Monoclonal / biosynthesis,  immunology*
Antigens, Bacterial / immunology*
Bacterial Adhesion
Bacterial Proteins / immunology*
Cross Reactions
Escherichia coli / immunology,  pathogenicity*
Fimbriae Proteins*
Hemagglutination Inhibition Tests
Intestines / microbiology
Mice, Inbred BALB C
Tumor Cells, Cultured
Reg. No./Substance:
0/Antibodies, Monoclonal; 0/Antigens, Bacterial; 0/Bacterial Proteins; 0/colonization factor antigens; 147680-16-8/Fimbriae Proteins

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