In stark contrast, deletion of the prosurvival protein Bcl-xL resulted in megakaryocyte apoptosis
and a failure of
platelet shedding. This could be rescued by deletion of Bak
and Bax. We examined the effect on megakaryocytes of three agents that activate the intrinsic apoptosis pathway in other cell types: etoposide, staurosporine, and the BH3 mimetic ABT-737. All three triggered mitochondrial damage, caspase activation, and cell death.