Protein tyrosine kinase p56lck-deficiency confers hypersusceptibility to rho-fluorophenylalanine (pFPhe)-induced apoptosis by augmenting mitochondrial apoptotic pathway in human Jurkat T cells |
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Authors: | Park Hae Sun Jun Do Youn Han Cho Rong Kim Young Ho |
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Institution: | Laboratory of Immunobiology, School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, 1370 Sankyuk-Dong, Buk-Ku, Daegu 702-701, Republic of Korea |
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Abstract: | Phenylalanine analog, ρ-fluorophenylalanine (pFPhe)-mediated cytotoxicity and several apoptotic events including mitochondrial cytochrome c release, activation of caspase-9, -3, and -8, Bid cleavage, degradation of PARP and PLCγ-1, and DNA fragmentation were more significant in p56lck-deficient Jurkat T cells (JCaM1.6) than in wild-type Jurkat T cells (E6.1). The susceptibility of JCaM1.6 toward apoptogenic activity of pFPhe decreased after acquisition of p56lck by transfection. The p56lck kinase activity increased 1.6-fold at 15-30 min after pFPhe treatment. The pan-caspase inhibitor (z-VAD-fmk) completely blocked the pFPhe-mediated apoptotic changes except caspase-9 activation. The caspase-8 inhibitor (z-IETD-fmk), which failed to influence pFPhe-induced caspase-9 activation, completely blocked caspase-8 activation and PLCγ-1 degradation with a marked reduction in caspase-3 activation and PARP degradation, indicating pFPhe-induced caspase-8 activation as a downstream event of mitochondria-dependent activation of caspase-9. These results indicate that the deficiency of p56lck augments pFPhe-induced mitochondrial cytochrome c release and resultant apoptotic cell death in Jurkat T cells. |
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Keywords: | ρ-Fluorophenylalanine Phenylalanine analog Apoptosis Mitochondrial cytochrome c release Caspase cascade p56lck-dificiency p56lck kinase |
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