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pp.203-210
Disruption of cell - matrix attachment results in a loss of prosurvival signals and culminates in programmed cell death, referred to as anoikis , Apoptosis signal- regulating kinase 1(ASKl)/MKK5 is a ubiquitously expressed enzyme that acti vates c-Jun N-terminal kinase/stress-activated protein kinase JNK/SAPK and p38 pathways by direct site specific Ser/Thr phosphoryl ation of their respective MKKs-MKK4/MKK7 for JNK and MKK3/MKK6 for p38 kinases, The kinase activity of ASKl is stimulated by a variety of death signals, including TNF, Fas ligation, reactive oxygen species, and antineoplastic agents , The aim of this study was to investigate the relative importance of ASKl in anOlkls 1n the present study cells which lost their adhesion showed higher rate of cell death in compared to cells which maintained anchorage. 1nterestingly the res ult showed that suspended cells expressing ASK1 were more susceptible to anoikis than suspended cells having no ASK1 1n addition, cellu lar attachment seems to have significant effect on ASKl activity and p38 MAPK protein rather than serum stimulation
