Combined DNA methyltransferase and histone deacetylase inhibition in the treatment of myeloid neoplasms |
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Authors: | Gore Steven D Baylin Stephen Sugar Elizabeth Carraway Hetty Miller Carole B Carducci Michael Grever Michael Galm Oliver Dauses Tianna Karp Judith E Rudek Michelle A Zhao Ming Smith B Douglas Manning Jasper Jiemjit Anchalee Dover George Mays Abbie Zwiebel James Murgo Anthony Weng Li-Jun Herman James G |
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Institution: | The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland 21287, USA. gorest@jhmi.edu |
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Abstract: | Optimal reexpression of most genes silenced through promoter methylation requires the sequential application of DNA methyltransferase inhibitors followed by histone deacetylase inhibitors in tumor cell cultures. Patients with myelodysplastic syndrome or acute myeloid leukemia (AML) were treated with the methyltransferase inhibitor 5-azacitidine (aza-CR) followed by the histone deacetylase inhibitor sodium phenylbutyrate. Major responses associated with cytogenetic complete response developed in patients receiving prolonged dosing schedules of aza-CR. Bisulfite sequencing of the p15 promoter in marrow DNA during the first cycle of treatment showed heterogeneous allelic demethylation in three responding patients, suggesting ongoing demethylation within the tumor clone, but no demethylation in two nonresponders. Six of six responding patients with pretreatment methylation of p15 or CDH-1 promoters reversed methylation during the first cycle of therapy (methylation-specific PCR), whereas none of six nonresponders showed any demethylation. Gene demethylation correlated with the area under the aza-CR plasma concentration-time curve. Administration of both drugs was associated with induction of acetylation of histones H3 and H4. This study provides the first demonstration that molecular mechanisms responsible for responses to DNA methyltransferase/histone deacetylase inhibitor combinations may include reversal of aberrant epigenetic gene silencing. The promising percentage of major hematologic responses justifies the testing of such combinations in prospective randomized trials. |
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