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Anthracyclines induce global changes in chromatin accessibility in cardiomyocytes that overlap with cardiovascular disease loci

ABSTRACT: We performed chromatin immunoprecipitation followed by sequencing (ChIP-seq) in human iPSC-derived cardiomyocytes to map genome-wide binding sites of TOP2B. Libraries were prepared from ChIP and matched input DNA, sequenced using 40 bp paired-end reads. After quality control and alignment to the human reference genome (GRCh38), high-confidence reads were filtered and duplicate reads removed. Peak calling using MACS2 in broad mode identified 5,410 enriched genomic regions, enabling investigation of TOP2B-associated regulatory elements in human cardiomyocytes.

ORGANISM(S): Homo sapiens

PROVIDER: GSE303207 | GEO | 2025/09/15

REPOSITORIES: GEO

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Project description:To compare expression profiles in the cardiomyocytes with wild type top2b and those with top2b deletion after in vivo treatment of mice with doxorubicin or drug vehicle Doxorubicin is widely used in modern cancer treatments, despite the advent of targeted therapy. However, a dose-dependent cardiotoxicity often limits its clinical use. The prevailing theory hypothesizes that doxorubicin-induced cardiotoxicity is the result of reactive oxygen species (ROS) generation due to redox-cycling of doxorubicin. Here we showed that cardiomyocyte-specific deletion of Topoisomerase II beta (Top2b) markedly reduced DNA double-strand breaks, apoptosis, and functional damages in doxorubicin-treated hearts. To investigate transcriptomic changes after doxorubicin treatment in wild type mouse and mouse with cardiac specific deletion of Top2b, we examined the expression profiles in 4 groups of mice (3/group), ie. wildtype mice with or without doxorubicin treatment and mice with Top2b deletion in the cardiomyocytes with or without doxorubicin treatment. Mice were treated with doxorubicin (25mg/kg, i.p.) or PBS (drug vehicle) for 16 hr or 72 hr. The heart was removed and cardiomyocytes were isolated by using a Langendorff apparatus. After purification, total RNA was extracted from the cardiomyocytes, purified, and used for gene expression analysis. Compared with that in control cardiomyocytes or cardiomyocytes with Top2b deletion, doxorubicin caused a significant expression change in the genome of cardiomyocytes from the wildtype mice. Among the changes, multiple genes encoding mitochondrial structural protein and components of the respiratory chain complexes were down-regulated 72 hr after treatment while multiple genes in the p53 pathway were up-regulated 16 hr after treatment in the wildtype cardiomyocytes. Expression changes were examined in 2 groups of mice (wild type and conditional knockout of top2b in the cardiomyocytes) treated with doxorubicin or PBS for 16 or 72 hours

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Anthracyclines induce global changes in chromatin accessibility in cardiomyocytes that overlap with cardiovascular disease loci

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