Bradykinin Generation Triggered by Pseudomonas Proteases Facilitates Invasion of the Systemic Circulation by Pseudomonas aeruginosa

• SAKATA Yoshifumi

  Department of Microbiology Kumamoto University School of Medicine

• AKAIKE Takaaki

  Department of Microbiology Kumamoto University School of Medicine

• SUGA Moritaka

  First Department of Internal Medicine, Kumamoto University School of Medicine

• IJIRI Sumiko

  Department of Microbiology Kumamoto University School of Medicine

• ANDO Masayuki

  First Department of Internal Medicine, Kumamoto University School of Medicine

• MAEDA Hiroshi

  Department of Microbiology Kumamoto University School of Medicine

抄録

To elucidate the mechanism of bacterial exoprotease in promotion of the intravascular dissemination of Pseudomonas aeruginosa, we examined the possible involvement of bradykinin (whose generation is induced by pseudomonal proteases in septic foci) in the invasion by bacteria, and in access of bacterial toxins to systemic blood circulation. P. aeruginosa 621 (PA 621), which produces very little protease, was injected intraperitoneally into mice together with pseudomonal exoproteases (elastase/alkaline protease). Dissemination of bacteria from the peritoneal septic foci to the blood was assessed by counting viable bacteria in the blood and spleen by use of the colony-forming assay. The results showed that pseudomonal proteases markedly enhanced (10-to 100-fold) intravascular dissemination of bacteria in mice. This enhancement was induced not only by pseudomonal proteases but also by bradykinin. More importantly, the increased spread of PA 621 induced by pseudomonal protease and bradykinin was significantly augmented by the addition of kininase inhibitors, indicating the direct involvement of bradykinin in bacterial dissemination. Similarly, bradykinin caused effective dissemination of pseudomonal toxins such as endotoxin (lipopolysaccharide) and exotoxin A when the toxins were injected into the peritoneal cavity with bradykinin. Furthermore, the lethality of the infection with PA 621 was strongly enhanced by pseudomonal proteases given i.p. simultaneously with PA 621. On the basis of these results, it is strongly suggested that pseudomonal proteases as well as bradykinin generated in infectious foci are involved in facilitation of bacterial dissemination in vivo.

収録刊行物

• Microbiology and immunology

  Microbiology and immunology 40 (6), 415-423, 1996-06-20

  財団法人 学会誌刊行センター

キーワード

• Pseudomonas protease
• Bradykinin
• Septicemia

詳細情報

• CRID: 1573668924045500416
• NII論文ID: 10004893018
• NII書誌ID: AA00738350
• ISSN: 03855600
• Web Site: http://chemport.cas.org/cgi-bin/sdcgi?APP=ftslink&action=reflink&origin=jstage2&version=1.0&coi=1:CAS:528:DyaK28Xkt1Cmsrc%3D&md5=01a02ca215c4724053037fbe2899ad17
• Web Site: https://search.jamas.or.jp/link/ui/1997042556
• 本文言語コード: en
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