期刊
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
卷 52, 期 -, 页码 121-133出版社
WILEY
DOI: 10.1042/BA20070264
关键词
apoptosis; Fas; Jurkat; NADPH oxidase; 15-(S)-hydroxyeicosatetraenoic acid [(15S)-HETE]; (15S)-hydroperoxyeicosatetraenoic acid [(15S)-HPETE]
资金
- Department of Science and Technology, New Delhi
- Dabur Research Foundation, Ghaziabad, India [VII-PRDSF/50/05-06/TDT]
- Council of Scientific and Industrial Research, New Delhi [37(122 1)/05/EMR-11]
- Department of Biotechnology, New Delhi [BT/PR-6106/PID/20/237/2005]
- Department of Science and Technology-Dabur Research Foundation
The anti proliferative effects of 15-LOX (IS-lipoxygenase) metabolites of arachidonic acid {(15S)-HPETE [(15S)-hydroperoxyeicosatetraenoic acid] and (15S)-HETE [(15S)-hydroxyeicosatetraenoic acid]} and the mechanism(s) involved were studied in the human T-cell leukaemia cell line Jurkat. (15S)-HPETE, the hydroperoxy metabolite of 15-LOX, inhibited the growth of Jurkat cells 3 h after exposure and with an IC50 value of 10 AM. The hydroxy metabolite of 15-LOX, (I SS)-HETE, on the other hand, inhibited the growth of jurkat cells after 6 h of exposure and with an IC50 value of 40 mu M. The cells exposed to 10 mu M (I SS)-HPETE for 3 h or to 40 mu M (15S)-HETE for 6 h showed increased expression of Fas ligand and FADD (Fas-associated death domain), caspase 8 activation, Bid (BH3-interacting domain death agonist) cleavage, decrease in mitochondrial membrane potential, cytochrome c release, caspase 3 activation, PARP-1 [poly(ADP-ribose) polymerase-1] cleavage and DNA fragmentation, suggesting the involvement of both extrinsic and intrinsic death pathways. Further studies on ROS (reactive oxygen species) generation revealed the involvement of NADPH oxidase. In conclusion, the present study indicates that NADPH oxidase-induced ROS generation activates the Fas-mediated death pathway.
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