Involvement of caspase activation through release of cytochrome c from mitochondria in apoptotic cell death of macrophages infected with Actinobacillus actinomycetemcomitans

Hironori Kasai, Kozo Yamamoto, Takeyoshi Koseki, Makoto Yokota, Tatsuji Nishihara

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We previously reported that infection with the periodontopathic bacterium Actinobacillus actinomycetemcomitans induced apoptosis in a mouse macrophage cell line J774.1. In the present study, we examined the involvement of cytochrome c and caspases in the induction of apoptosis in A. actinomycetemcomitans-infected J774.1 cells. Following infection, the expression levels of cytochrome c, and cleaved forms of caspase-3 and caspase-9 in the cells were examined using immunoblot analysis. Cytochrome c was released from mitochondria into the cytoplasm after A. actinomycetemcomitans-infected J774.1 cells were cultured for 6 h, and caspase-3 and caspase-9 were found to be cleaved forms in the cells. Further, caspase-9 activity was markedly increased, and phosphorylated p53 was detected in the cells 30 h following infection. These results suggest that apoptosis in A. actinomycetemcomitans- infected J774.1 cells is regulated by the release of cytochrome c from mitochondria into cytoplasm and the subsequent activation of caspases through phosphorylation of p53.

Original languageEnglish
Pages (from-to)29-35
Number of pages7
JournalFEMS Microbiology Letters
Volume233
Issue number1
DOIs
Publication statusPublished - 2004 Apr 1

Keywords

  • Actinobacillus actinomycetemcomitans
  • Apoptosis
  • Caspases
  • Cytochrome c
  • Macrophage
  • p53

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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