Protective effect of Lactobacillus casei on Pseudomonas aeruginosa infection in mice

Shunji Miake, Koji Nomoto, Teruo Yokokura, Yasunobu Yoshikai, Masahiko Mutai, Kikuo Nomoto

    Research output: Contribution to journalArticlepeer-review

    51 Citations (Scopus)

    Abstract

    The protective effect of heat-killed Lactobacillus casei YIT9018 (LC 9018) against Pseudomonas aeruginosa infection in mice was compared with that of Corynebacterium parvum. Survival of mice after intraperitoneal (i.p.) infection with P. aeruginosa was augmented in mice that had been pretreated i.p. with LC 9018 5 days previously. Similar treatment of mice with C. parvum, however, was not effective at all. Moreover, mice became more susceptible to infection with P. aeruginosa after such treatment. Growth of P. aeruginosa in the peritoneal cavity and spleen was markedly inhibited in LC 9018-pretreated mice, whereas such inhibition of bacterial growth was not observed in C. parvum-treated mice. The protective effect of LC 9018 was observed in mice subjected to 800 rads of whole body irradiation but was abrogated when mice were treated with carrageenan. These results suggest that augmentation of the resistance of mice to P. aeruginosa was caused by the induction of activated macrophages. The number of macrophages detectable in the peritoneal cavity was almost the same in LC 9018- and C. parvum-treated mice. Growth of Listeria monocytogenes was inhibited by pretreatment with LC 9018. Inhibition of L. monocytogenes was also observed after the same pretreatment with C. parvum. It was suggested that macrophages activated with LC 9018 were involved in the protective immunity to P. aeruginosa.

    Original languageEnglish
    Pages (from-to)480-485
    Number of pages6
    JournalInfection and Immunity
    Volume48
    Issue number2
    DOIs
    Publication statusPublished - 1985

    All Science Journal Classification (ASJC) codes

    • Parasitology
    • Microbiology
    • Immunology
    • Infectious Diseases

    Fingerprint

    Dive into the research topics of 'Protective effect of Lactobacillus casei on Pseudomonas aeruginosa infection in mice'. Together they form a unique fingerprint.

    Cite this