Apoptotic Activity of Insect Pathogenic Fungus Paecilomycesc japonica Toward Human Acute Leukemia Jurkat T Cells is Associated with Mitochondria-Dependent Caspase-3 Activation Regulated by Bcl-2

  • Park, Hye-Won (Laboratory of Immunobiology, Department of Microbiology, College of Natural Sciences, Kyungpook National University) ;
  • Jen, Do-Youn (Laboratory of Immunobiology, Department of Microbiology, College of Natural Sciences, Kyungpook National University) ;
  • Kim, Young-Ho (Laboratory of Immunobiology, Department of Microbiology, College of Natural Sciences, Kyungpook National University)
  • Published : 2002.12.01

Abstract

The antitumor activity of the insect pathogenic fungus Paecilomyces japonica has been attributed to apoptotic cell death. However, the mechanism underlying the induced apoptosis has not yet been elucidated. In this study, we for the first time show that mitochondria-dependent caspase-3 activation were associated with the apoptotic activity of P. japonica in human acute leukemia Jurkat T cells. When Jurkat T cells were treated with the ethyl acetate extract of P japonica at concentrations ranging from $2-6{\mu}g/ml$, apoptotic cell death. accompanied by several biochemical events such as caspase-9 activation, caspase-3 activation, degradation of poly (ADP-ribose) polymerase (PARP), and apoptotic DNA fragmentation, was induced in a dose-dependent manner. In addition, the release of cytochrome c from mitochondria was detected. Under these conditions, the expression of Fas and Fas-ligand (FasL) remained unchanged. Ethyl acetate extract-induced mitochondrial cytochrome c release, caspase-3 activation, PARP cleavage, and apoptotic DNA fragmentation were suppressed by the ectopic expression of Bcl-2, which is known to block mitochondrial cytochrorme c release. Accordingly, these results demonstrate that P. japonica-induced apoptotic cell death is mediated by a cytochrome c-dependent caspase-3 activation pathway that can be interrupted by Bcl-2.

Keywords

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