Increase of Apoptosis in a Murine Model for Severe Pneumococcal Pneumonia during Influenza A Virus Infection

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  • Kosai Kosuke
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Seki Masafumi
    Second Department of Internal Medicine, Nagasaki University, Japan Division of Infectious Diseases and Prevention, Osaka University Hospital, Japan
  • Tanaka Akitaka
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Morinaga Yoshitomo
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Imamura Yoshifumi
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Izumikawa Koichi
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Kakeya Hiroshi
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Yamamoto Yoshihiro
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Yanagihara Katsunori
    Second Department of Internal Medicine, Nagasaki University, Japan
  • Tomono Kazunori
    Division of Infectious Diseases and Prevention, Osaka University Hospital, Japan
  • Kohno Shigeru
    Second Department of Internal Medicine, Nagasaki University, Japan

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<p>The mechanisms of severe pneumonia caused by co-infection of bacteria and influenza A virus (IAV) have not been fully elucidated. We examined apoptosis and inflammatory responses in a murine model for pneumococcal pneumonia during IAV infection. Inflammation, respiratory epithelium apoptosis, and inflammatory-cell infiltration increased in a time dependent manner in the lungs of mice co-infected with Streptococcus pneumoniae and IAV, in comparison with those infected with either S. pneumoniae or IAV. According to appearance of terminal deoxynucleotidyl transferase dUTP-mediated nick-end labeling positive cells, caspases-3 and -8 were activated 24 h after S. pneumoniae infection, and caspase-3 activation decreased after 48 h, whereas inflammatory cytokine levels continued to increase in co-infected mice. In contrast, in mice infected with either IAV or S. pneumoniae, apoptosis and activation of factors related to caspase-3 peaked at 48 h. Furthermore, Fas-associated death domain was significantly expressed in the lungs of co-infected mice 24 h after S. pneumoniae infection. These data suggest that early onset of apoptosis and its related factors play important roles in fulminant pneumonia resulting from bacterial pneumonia complicated by co-infection with influenza virus.<tt> </tt></p>

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