Chemokine responses and accumulation of inflammatory cells in the lungs of mice infected with highly virulent Cryptococcus neoformans: Effects of interleukin-12

Kazuyoshi Kawakami, Kazutoshi Shibuya, Mahboob Hossain Qureshi, Tiantuo Zhang, Yoshinobu Koguchi, Masaki Tohyama, Qifeng Xie, Shiro Naoe, Atsushi Saito

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We examined the mechanisms involved in the development of lung lesions after infection with Cryptococcus neoformans by comparing the histopathological findings and chemokine responses in the lungs of mice infected with C. neoformans and assessed the effect of interleukin (IL) 12 which protects mice from lethal infection. In mice infected intratracheally with a highly virulent strain of C. neoformans, the yeast cells multiplied quickly in the alveolar spaces but only a poor cellular inflammatory response was observed throughout the course of infection. Very little or no production of chemokines, including MCP-1, RANTES, MIP-1α, MIP-1β and IP-10, was detected at the mRNA level using RT-PCR as well as at a protein level in MCP-1, RANTES and MIP-1α. In contrast, intraperitoneal administration of IL-12 induced the synthesis of these chemokines and a marked cellular inflammatory response involving histiocytes and lymphocytes in infected mice. Our findings were confirmed by flow cytometry of intraparenchymal leukocytes obtained from lung homogenates which showed IL-12-induced accumulation of inflammatory cells consisting mostly of macrophages and CD4+ αβ T cells. On the other hand, C-X-C chemokines including MIP-2 and KC, which attract neutrophils, were produced in infected and PBS-treated mice but treatment with IL-12 showed a marginal effect on their level, and neutrophil accumulation was similar in PBS- and IL-12-treated mice infected with C. neoformans. Our results demonstrate a close correlation between chemokine levels and development of lung lesions, and suggest that the induction of chemokine synthesis may be one of the mechanisms of IL-12-induced protection against cryptococcal infection. Copyright (C) 1999 Federation of European Microbiological Societies.

Original languageEnglish
Pages (from-to)391-402
Number of pages12
JournalFEMS Immunology and Medical Microbiology
Volume25
Issue number4
DOIs
Publication statusPublished - 1999 Sep

Keywords

  • Chemokine
  • Cryptococcus neoformans
  • Inflammation
  • Interleukin 12
  • Lung

ASJC Scopus subject areas

  • Immunology and Allergy
  • Microbiology
  • Immunology
  • Microbiology (medical)
  • Infectious Diseases

Fingerprint Dive into the research topics of 'Chemokine responses and accumulation of inflammatory cells in the lungs of mice infected with highly virulent Cryptococcus neoformans: Effects of interleukin-12'. Together they form a unique fingerprint.

Cite this