eISSN: 1896-9151
ISSN: 1734-1922
Archives of Medical Science
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1/2007
vol. 3
 
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abstract:

Original paper
Arachidonic acid metabolism in TNF, CD178 (CD95 ligand) and ceramide-mediated cytotoxicity

Monika Ołdak
,
Jarosław Joźwiak
,
Radosław Maksym
,
Jacek Malejczyk

Arch Med Sci 2007; 3, 1: 27-30
Online publish date: 2007/03/23
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Introduction: Arachidonic acid release has been reported to play a significant role in TNF-induced cytotoxicity. However, the role of this signalling cascade in CD178-(CD95 ligand)mediated cytotoxicity remains unclear. The aim of the study was to investigate the role of arachidonic acid metabolism in TNF- and CD95-mediated cytotoxicity. Material and methods: Naturally TNF-sensitive A9 and CD178-sensitive A9-CD95 (the cells stably transfected with human CD95) cell lines were subjected to inhibitors of phospholipase A2 (AACOCF3, PACOCF3), lipoxygenase (NDGA) and cycloxygenase (indomethacin). Results: We showed that the cytotoxic activity of TNF could by inhibited by AACOCF3 and PACOCF3, inhibitors of phospholipase A2 as well as by NDGA, displaying anti-lipoxygenase and anti-oxidant inhibitory activity. In contrast, none of the tested inhibitors of arachidonic acid metabolism affected CD178-mediated cytotoxicity in A9-CD95 cells stably expressing CD95. Cytotoxicity mediated by C6-ceramide, a possible mediator of TNF- and CD178-mediated cytotoxicity, was also unaffected by these inhibitors. Conclusions: The above facts strongly suggest that CD95- as well as C6 ceramide-induced cell death does not depend on arachidonic acid metabolism.
keywords:

arachidonic acid, TNF, CD178, CD95, ceramide

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