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We have studied the actions of the protein phosphatase inhibitor okadaic acid (OA) on the expression of bcl-2 in HL60 human leukemia cells. OA induced downregulation of bcl-2 mRNA and protein prior to the induction of apoptosis. Downregulation of bcl-2 mRNA levels did not result from actions of OA on the bcl-2 upstream negative response element. Nuclear run-off analyses confirmed that OA did not affect...
The bcl-2 protein suppresses apoptosis and the bax protein opposes the cytoprotective effect of bcl-2. A decrease in bcl-2 levels has been implicated in the induction of apoptosis during the terminal differentiation of HL60 myeloid leukaemia cells. We show here that bax protein also declined with a time course similar to the downregulation of bcl-2 following treatment of HL60 with phorbol myristate...
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