Role of Pseudomonas aeruginosa quorum-sensing systems in a mouse model of chronic respiratory infection.
The role of quorum-sensing systems in a mouse model of chronic Pseudomonas aeruginosa infection was studied. A chronic P. aeruginosa respiratory infection model was established by placement of a tube pre-coated with strain PAO1 (wild-type) or a quorum-sensing mutant, namely PAO-JP1 (Delta lasI), PDO100 (Delta rhlI) or PAO-JP2 (Delta lasI/Delta rhlI), in the bronchus. At day 14 after infection, the numbers of viable bacteria in the quorum-sensing-mutant groups were lower than in the wild-type group. Histopathological examination showed milder inflammatory changes in the lungs infected with the mutant groups compared with the wild-type group. In the bronchoalveolar lavage fluid from the quorum-sensing-system-mutant groups the proportion of neutrophils was lower than in wild-type group. These findings indicate that the quorum-sensing system plays an important role in chronic P. aeruginosa respiratory infection.
Imamura
Yoshifumi
Y
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Yanagihara
Katsunori
K
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Tomono
Kazunori
K
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Ohno
Hideaki
H
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Higashiyama
Yasuhito
Y
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Miyazaki
Yoshitsugu
Y
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Hirakata
Yoichi
Y
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Mizuta
Yohei
Y
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Kadota
Jun-Ichi
JI
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Tsukamoto
Kazuhiro
K
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Kohno
Shigeru
S
Second Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics; D001980:Bronchi / Q000382:microbiology; D002908:Chronic Disease; D004195:Disease Models, Animal; D008025:Ligases / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D009154:Mutation; D011552:Pseudomonas Infections / Q000382:microbiology*; D011550:Pseudomonas aeruginosa / Q000235:genetics / Q000472:pathogenicity / Q000502:physiology*; D012141:Respiratory Tract Infections / Q000382:microbiology*; D014157:Transcription Factors / Q000235:genetics; D014774:Virulence
D001426:Bacterial Proteins; C081237:LasI protein, Pseudomonas aeruginosa; D014157:Transcription Factors; D008025:Ligases; C096955:RHLI protein, Pseudomonas aeruginosa