Activation of the intrinsic mitochondrial apoptotic pathway in swine influenza virus-mediated cell death

Ki Choi Young, Tae Kyung Kim, Chul Joong Kim, Joong Seob Lee, Se Young Oh, Soo Joo Han, Douglas N. Foster, Ki Chang Hong, Seungkwon You, Hyunggee Kim

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


The mitochondrial pathway of swine influenza virus (SIV)-induced apoptosis was investigated using porcine kidney (PK-15) cells, swine testicle (ST) cells, and HeLa cervical carcinoma cells which are known not to support viral replication. As judged by cell morphology, annexin V staining, and DNA fragmentation, PK-15 and ST cells infected with three different subtypes of SIV (H1N1, H3N2, and H1N2) were obviously killed by apoptosis, not necrosis. SIV infection in PK-15 and HeLa cells was shown to decrease the cellular levels of Bcl-2 protein compared to that of mock-infected control cells at 24 h post-infection, whereas expression levels of Bax protein increased in the PK-15 cells, but did not increase in HeLa cells by SIV infection. Cytochrome c upregulation was also observed in cytosolic fractions of the PK-15 and HeLa cells infected with SIV. Apoptosome (a multi-protein complex consisting of cytochrome c, Apaf-1, caspase-9, and ATP) formation was confirmed by immunoprecipitation using cytochrome c antibody. Furthermore, SIV infection increased the cellular levels of TAJ, an activator of the JNK- stressing pathway, and the c-Jun protein in the PK-15 and HeLa cells. Taken together, these results suggest that the mitochondrial pathway should be implicated in the apoptosis of PK-15 cells induced by SIV infection.

Original languageEnglish
Pages (from-to)11-17
Number of pages7
JournalExperimental and Molecular Medicine
Issue number1
Publication statusPublished - 2006 Feb 28


  • Apoptosis
  • Cytochrome c
  • Influenza virus
  • Mitochondria
  • Proto-oncogene proteins c-Bcl-2
  • Proto-oncogene proteins c-jun

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Clinical Biochemistry


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