Bfl-1/A1 Molecules are Induced in Mycobacterium Infected THP-1 Cells in the Early Time Points

  • Park, Sang-Jung (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Cho, Jang-Eun (Department of Biomedical Laboratory Science, Daegu Health College) ;
  • Kim, Yoon-Suk (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Cho, Sang-Nae (Department of Microbiology, Yonsei University College of Medicine) ;
  • Lee, Hye-Young (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
  • 투고 : 2012.05.31
  • 심사 : 2012.09.04
  • 발행 : 2012.09.30

초록

Apoptosis is a physiological programmed cell death process. Tubercle bacilli inhibit apoptosis of alveolar macrophages and phagolysosome fusion. We investigated whether the Bcl-2 family anti-apoptotic member, Bfl-1/A1, plays an important role in the anti-apoptotic process during mycobacterial infection. PMA-treated human monocytoid THP-1 cells were infected with mycobacteria (H37Rv, BCG, and K-strain) at a multiplicity of infection (MOI) of 10 for 0, 1.5, 3, 6, 9, 12, 18, 24, 48, or 72 h. In addition, PMA-treated THP-1 cells were pretreated with specific inhibitors for 45 min before stimulation with mycobacteria at an MOI of 10 for 4 h. After the indicated time, the cells were subject to reverse transcription-polymerase chain reaction (RT-PCR) analysis, and a Bfl-1/A1-specific Western blot was performed. In PMA-differentiated THP-1 cells, the expression level of Bfl-1/A1 mRNA was increased by Mycobacterium tuberculosis (MTB) H37Rv infection. The mRNA level of Bfl-1/A1 peaked 3 h after MTB infection, then declined gradually until 9 h. However, Bfl-1/A1 mRNA induction gradually re-increased from 24 h to 72 h after MTB infection. No difference in Bfl-1/A1 expression was detected following infection with MTB H37Rv, K-strain, or M. bovis BCG. These results were not dependent on mycobacterial virulence. Moreover, mRNA levels of other anti-apoptotic molecules (Mcl-1, Bcl-2, and Bcl-xL) were not increased after MTB H37Rv or K-strain infection. These results suggest that mycobacteria induce the innate immune host defense mechanisms that utilize Bfl-1/A1 molecules at early time points, regardless of virulence.

키워드

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