TY - JOUR
T1 - A Salmonella fim homologue in Citrobacter freundii mediates invasion in vitro and crossing of the blood-brain barrier in the rat pup model
AU - Hess, Petra
AU - Altenhöfer, Artur
AU - Khan, A. Salam
AU - Daryab, Neda
AU - Kim, Kwang Sik
AU - Hacker, Jörg
AU - Oelschlaeger, Tobias A.
PY - 2004/9
Y1 - 2004/9
N2 - From the invasive Citrobacter freundii strain 3009, an invasion determinant was cloned, sequenced, and expressed. Sequence analysis of the determinant showed high homology with the fim determinant from Salmonella enterica serovar Typhimurium. The genes of the invasion determinant directed invasion of recombinant Escherichia coli K-12 strains into human epithelial cell lines of the bladder and gut as well as mannose-sensitive yeast agglutination and were termed fimCf genes. Expression of the FimCf proteins was shown by 35S labeling and/or Western blotting. In the infant rat model of experimental hematogenous meningitis, C. freundii strain 3009 and the in vitro invasive recombinant E. coli K-12 strain harboring the fim Cf, determinant reached the cerebrospinal fluid, in contrast to the case for the control strain. The fim determinant was also necessary for efficient in vitro invasion by C. freundii, because a deletion mutant was strongly reduced in its invasion efficiency. The mutation could be complemented in trans by the corresponding genes. Invasion by C. freundii could be blocked only by D-mannose, GlcNAc, and chitin hydrolysate and not by other carbohydrates tested. In contrast, yeast agglutination was not affected by GlcNAc or chitin hydrolysate. This finding indicated mannose residues to be essential for both yeast agglutination and invasion, whereas GlcNAc (oligomer) residues of host cells are involved exclusively in invasion. These results showed the fim determinant of C. freundii to be responsible for D-mannose- and GlcNAc-dependent in vitro invasion without being assembled into pili and for crossing of the blood-brain barrier in the infant rat model.
AB - From the invasive Citrobacter freundii strain 3009, an invasion determinant was cloned, sequenced, and expressed. Sequence analysis of the determinant showed high homology with the fim determinant from Salmonella enterica serovar Typhimurium. The genes of the invasion determinant directed invasion of recombinant Escherichia coli K-12 strains into human epithelial cell lines of the bladder and gut as well as mannose-sensitive yeast agglutination and were termed fimCf genes. Expression of the FimCf proteins was shown by 35S labeling and/or Western blotting. In the infant rat model of experimental hematogenous meningitis, C. freundii strain 3009 and the in vitro invasive recombinant E. coli K-12 strain harboring the fim Cf, determinant reached the cerebrospinal fluid, in contrast to the case for the control strain. The fim determinant was also necessary for efficient in vitro invasion by C. freundii, because a deletion mutant was strongly reduced in its invasion efficiency. The mutation could be complemented in trans by the corresponding genes. Invasion by C. freundii could be blocked only by D-mannose, GlcNAc, and chitin hydrolysate and not by other carbohydrates tested. In contrast, yeast agglutination was not affected by GlcNAc or chitin hydrolysate. This finding indicated mannose residues to be essential for both yeast agglutination and invasion, whereas GlcNAc (oligomer) residues of host cells are involved exclusively in invasion. These results showed the fim determinant of C. freundii to be responsible for D-mannose- and GlcNAc-dependent in vitro invasion without being assembled into pili and for crossing of the blood-brain barrier in the infant rat model.
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U2 - 10.1128/IAI.72.9.5298-5307.2004
DO - 10.1128/IAI.72.9.5298-5307.2004
M3 - Article
C2 - 15322026
AN - SCOPUS:4544341264
SN - 0019-9567
VL - 72
SP - 5298
EP - 5307
JO - Infection and immunity
JF - Infection and immunity
IS - 9
ER -