Abstract:
:The tumor suppressor p53 is often referred to as "the guardian of the genome" because of its central role in the cellular response to oncogenic stress and prevention of tumor development. Mutations of p53 in acute myeloid leukemia (AML) are rare but resistance to chemotherapy has been reported because of the deregulation of the p53 signaling and differentiation pathways. It is known that the interaction of the vitamin D metabolite 1,25-dihydroxyvitamin D(3) (1,25D) with its functional vitamin D receptor leads to differentiation, G(1) arrest, and increased cell survival in p53-null AML cells. However, there are no reports on the effect of 1,25D in leukemia cells expressing wild-type p53. Here, we examine vitamin D signaling in AML cells MOLM-13 and OCI-AML3 expressing wild-type p53 in the presence and absence of the MDM2 antagonist nutlin-3. We find that 1,25D alone induces monocytic differentiation in these cell lines similar to that seen in p53-null AML cells, suggesting that the presence of wild-type p53 is compatible with activation of vitamin D signaling. Combination of nutlin-3a with 1,25D accelerated programmed cell death, likely because of enhanced nutlin-induced upregulation of the proapoptotic PIG-6 protein and downregulation of antiapoptotic BCL-2, MDMX, human kinase suppressor of Ras 2, and phosphorylated extracellular signal-regulated kinase 2.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Thompson T,Andreeff M,Studzinski GP,Vassilev LTdoi
10.1158/1535-7163.MCT-09-1036subject
Has Abstractpub_date
2010-05-01 00:00:00pages
1158-68issue
5eissn
1535-7163issn
1538-8514pii
1535-7163.MCT-09-1036journal_volume
9pub_type
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