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Background The cytidine nucleoside analogs azacitidine (AZA) and decitabine (DAC) are used for the treatment of patients with myelodysplastic syndromes and acute myeloid leukemia (AML). Few non-clinical studies have directly compared the mechanisms of action of these agents in a head-to-head fashion, and the agents are often viewed as mechanistically similar DNA hypomethylating agents. To better understand the similarities and differences in mechanisms of these drugs, we compared their in vitro effects on several end points in human AML cell lines. Methodology/Principal Findings Both drugs effected DNA methyltransferase 1 depletion, DNA hypomethylation, and DNA damage induction, with DAC showing equivalent activity at concentrations 2- to 10-fold lower than AZA. At concentrations above 1 µM, AZA had a greater effect than DAC on reducing cell viability. Prasanth Hits Tamil Songs Download there.
Both drugs increased the sub-G1 fraction and apoptosis markers, with AZA decreasing all cell cycle phases and DAC causing an increase in G2-M. Total protein synthesis was reduced only by AZA, and drug-modulated gene expression profiles were largely non-overlapping. Citation: Hollenbach PW, Nguyen AN, Brady H, Williams M, Ning Y, Richard N, et al. (2010) A Comparison of Azacitidine and Decitabine Activities in Acute Myeloid Leukemia Cell Lines.
PLoS ONE 5(2): e9001. Editor: Alfons Navarro, University of Barcelona, Spain Received: October 2, 2009; Accepted: January 13, 2010; Published: February 2, 2010 Copyright: © 2010 Hollenbach et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Ec Sc73861 Driver Windows 7. Funding: This study was funded by Celgene Corporation (). The authors received editorial support from Excerpta Medica for copy editing this manuscript, funded by Celgene Corporation. The authors wrote the manuscript and are fully responsible for content and editorial decisions for this manuscript. Thief The Dark Project Torrent Pc more.
Competing interests: Vidaza is a marketed product with azacitidine as the active pharmaceutical ingredient. Dacogen is a marketed product with decitabine as the active pharmaceutical ingredient. The authors are able to adhere to the PLoS ONE policies on sharing data and materials. P.W.H., A.N.N., H.B., Y.N., N.R., S.L.A., C.H., and K.J.M. Are employees of Celgene and as such own stock in the company.
Received research support from Celgene. Introduction Azacitidine (AZA; Vidaza®, Celgene Corp., Summit, NJ) and decitabine (DAC; Dacogen®, Eisai Inc., Woodcliff Lake, NJ) are structurally related, but distinct, cytidine nucleoside analogs used clinically for the treatment of myelodysplastic syndromes (MDS) andacute myeloid leukemia (AML),. AZA is a ribonucleoside and DAC is a deoxyribonucleoside. Following cellular uptake and sequential phosphorylations, AZA is incorporated into both RNA and DNA –. In contrast, DAC is phosphorylated by different kinases and is incorporated solely into DNA. Once incorporated into DNA, AZA and DAC have related mechanisms of action, including depletion of DNA methyltransferases (DNMTs),, hypomethylation of DNA,, and induction of DNA damage,. In randomized controlled phase III clinical trials in patients with MDS, overall response rates with AZA and DAC have been similar –; however, overall survival rates have differed.
Whereas AZA demonstrated a significantly increased median overall survival in higher-risk MDS patients (by 9.4 months) compared with conventional care regimens, DAC did not demonstrate a statistically significant improvement in survival in a similar clinical trial. Mechanisms of action that might explain differences in clinical activities of AZA and DAC have not been clearly defined. The conventional description of AZA and DAC as interchangeable DNA hypomethylating agents overlooks potential additional mechanisms of AZA activity which are mediated via incorporation into newly synthesized RNA, including rRNAs, tRNAs, mRNAs, and miRNAs. It has been shown that RNA incorporation can account for 80–90% of the AZA incorporated into cellular nucleic acid. The functional consequences of AZA incorporation into RNA include alterations in the processing of tRNA and rRNAs, leading to inhibition of protein synthesis, –. In two recent publications, direct comparisons of AZA and DAC activities have been made,.