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Breast Cancer Research and Treatment
Published in: Breast Cancer Research and Treatment 2/2012

01-01-2012 | Preclinical study

Enhancement of chemotherapeutic efficacy in hypermethylator breast cancer cells through targeted and pharmacologic inhibition of DNMT3b

Authors: Rupninder Sandhu, Ashley G. Rivenbark, William B. Coleman

Published in: Breast Cancer Research and Treatment | Issue 2/2012

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Abstract

A subset of primary breast cancers and breast cancer cell lines express a hypermethylation defect (characterized by DNMT hyperactivity and DNMT3b overexpression) which contributes to chemotherapy resistance and provides a target for development of new treatment strategies. The objective of the current study was to determine if targeting the epigenome enhances the sensitivity of breast cancer cells to cytotoxic chemotherapy. Hypermethylator breast cancer cell lines (MDA-MB-453, BT549, and Hs578T) were treated with 250 or 500 nM 5-aza-2′-deoxycytidine (5-aza) and/or were subjected to RNAi-mediated DNMT3b knockdown (KD), and then tested for sensitivity to doxorubicin hydrochloride (DOX), paclitaxel (PAX), and 5-fluorouracil (5-FU). In MDA-MB-453 cells, DNMT3b KD reduces the IC50 for DOX from 0.086 to 0.048 μM (44% reduction), for PAX from 0.497 to 0.376 nM (24%), and for 5-FU from 0.817 to 0.145 mM (82%). Treatment with 250 nM 5-aza for 7 days did not increase the efficacy of DOX, PAX, or 5-FU, but 7-day treatment with 500 nM 5-aza sensitized cells, reducing the IC50 for DOX to 0.035 μM (60%), PAX to 0.311 nM (37%), and 5-FU to 0.065 mM (92%). 5-aza treatment of DNMT3b KD cells reduced the IC50 for DOX to 0.036 μM (59%), for PAX to 0.313 nM (37%) and for 5-FU to 0.067 (92%). Similar trends of enhancement of cell kill were seen in BT549 (13–60%) and Hs578T (29–70%) cells after RNAi-mediated DNMT3b KD and/or treatment with 5-aza. The effectiveness of DOX, PAX, and 5-FU is enhanced through targeted and/or pharmacological inhibition of DNMT3b, strongly suggesting that combined epigenetic and cytotoxic treatment will improve the efficacy of breast cancer chemotherapy.
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Metadata
Title
Enhancement of chemotherapeutic efficacy in hypermethylator breast cancer cells through targeted and pharmacologic inhibition of DNMT3b
Authors
Rupninder Sandhu
Ashley G. Rivenbark
William B. Coleman
Publication date
01-01-2012
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 2/2012
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-011-1409-2

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