Mitochondrial permeabilisation after NO donor application did not activate caspase-9. We have studied the X-linked apoptosis inhibitor (XIAP) and Aven protein content in NO-treated Jurkat cells. The level of both proteins increased in NO-treated cells. Thus the increase in XIAP and Aven content could be the cause of the lack of caspase-9 activity after mitochondrial permeabilisation in NO-treated Jurkat cells.
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