Effects of quorum-sensing on immunoglobulin G responses in a rat model of chronic lung infection with Pseudomonas aeruginosa.
Levels of serum antibodies against Pseudomonas aeruginosa were observed for 106 days in a rat model of chronic lung infection. Significantly weaker responses of serum IgG and IgG1 and a lower ratio of IgG1/IgG2a were found in the rats infected with the quorum-signal-deficient mutant, PAO1 (rhlI, lasI), compared with the wild-type PAO1. Four out of 15 rats infected with wild-type PAO1 contained bacteria in the lungs on day 106, whereas no bacteria were found in the mutant PAO1 group. The results indicate that quorum signals contribute to the persistence of the infection and influence the immune response.
Wu
Hong
H
Department of Clinical Microbiology, Afsnit 9301, University Hospital of Copenhagen, Rigshospitalet, Juliane Maries Vej 22, 2100, Copenhagen, Denmark. wuhong@get2net.dk
Song
Zhijun
Z
Givskov
Michael
M
Høiby
Niels
N
D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood*; D001426:Bacterial Proteins / Q000235:genetics / Q000276:immunology*; D002908:Chronic Disease; D004195:Disease Models, Animal; D007074:Immunoglobulin G / Q000097:blood*; D008025:Ligases; D008171:Lung Diseases / Q000097:blood / Q000175:diagnosis* / Q000382:microbiology; D009154:Mutation; D011379:Prognosis; D011552:Pseudomonas Infections / Q000097:blood / Q000175:diagnosis* / Q000382:microbiology; D011550:Pseudomonas aeruginosa / Q000235:genetics / Q000276:immunology; D051381:Rats; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics / Q000276:immunology*
D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D007074:Immunoglobulin G; C081237:LasI protein, Pseudomonas aeruginosa; D014157:Transcription Factors; D008025:Ligases; C096955:RHLI protein, Pseudomonas aeruginosa