Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gene expression profiles of HCT116 colorectal carcinoma cells treated with HDAC inhibitors

ABSTRACT: Histone deacetylases (HDACs) regulate gene expression. Inhibition of class I HDACs has been shown to inhibit cancer cell growth. Largazole, a new potent HDAC inhibitor, shows strong antitumor activity, presumably by modulating transcription of cancer relevant genes. We used microarray analysis of human HCT116 colorectal carcinoma cell line to determine the gene expression profile after largazole treatment in comparison with other HDAC inhibitors (FK228 and SAHA). The goal was to identify regulated genes that can be linked to the antiproliferative effects of these HDAC inhibitors in HCT116 cells. To characterize the genes regulated by Largazole, SAHA and FK228, genome-wide gene expression analysis was carried out. Human HCT116 colorectal carcinoma cells (400,000) were seeded per well (6-well dish) and one day later treated with Largazole, SAHA, FK228 and vehicle control. 10 h later, total RNA was extracted and processed for hybridization to an Affymetrix Human Genome U133 2.0 GeneChip. Global alterations in transcript levels upon Largazole, SAHA and FK228 treatment were determined through comparison with data derived from cells treated with vehicle control. The experiment was carried out in duplicate.

ORGANISM(S): Homo sapiens

SUBMITTER: yanxia liu

PROVIDER: E-GEOD-22061 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Anticolon cancer activity of largazole, a marine-derived tunable histone deacetylase inhibitor.

Liu Yanxia Y Salvador Lilibeth A LA Byeon Seongrim S Ying Yongcheng Y Kwan Jason C JC Law Brian K BK Hong Jiyong J Luesch Hendrik H

The Journal of pharmacology and experimental therapeutics 20100825 2

Histone deacetylases (HDACs) are validated targets for anticancer therapy as attested by the approval of suberoylanilide hydroxamic acid (SAHA) and romidepsin (FK228) for treating cutaneous T cell lymphoma. We recently described the bioassay-guided isolation, structure determination, synthesis, and target identification of largazole, a marine-derived antiproliferative natural product that is a prodrug that releases a potent HDAC inhibitor, largazole thiol. Here, we characterize the anticancer ac ...[more]

PMID: 20739454

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Project description:Heart Failure with preserved Ejection Fraction (HFpEF) is a major global health problem but there are no effective therapies. The aim of this study was to assess the effects of histone deacetylase (HDAC) inhibition on cardiopulmonary structure, function, and metabolism in a large mammalian (feline) pressure overload model with HFpEF features. Male domestic short hair cats (n=26, aged 2mo), underwent either a sham procedure (n=5) or aortic constriction (n=21) using a pre-shaped band, resulting in slow-progressive pressure overload during subsequent growth. Two-months post-banding, banded cats were treated daily with either 10mg/kg suberoylanilide hydroxamic acid (b+SAHA) (n=8), an FDA approved pan-HDAC inhibitor, or vehicle (b+veh) (n=8) for 2 months. Echocardiography at 4-months post-banding revealed that b+SAHA animals had a significant reduction in left ventricular hypertrophy (LVH) and LA size vs b+veh animals. Invasively measured left ventricular end-diastolic pressure (LVEDP) and mean pulmonary arterial pressure (mPAP) were significantly elevated in b+veh and significantly reduced by b+SAHA. SAHA speeded ex-vivo myofibril relaxation independent of LVH and this effect correlated with in-vivo indices of LV relaxation. Furthermore, SAHA preserved lung structure, improved lung compliance and oxygenation, reflected by a decrease in alveolar-capillary wall thickness, alveolar-arterial oxygen gradient (A-aDO2), and intrapulmonary shunt. SAHA also reduced perivascular fluid cuffs around extra-alveolar vessels, suggesting attenuated alveolar-capillary stress failure. Acetylation proteomics revealed that SAHA altered protein acetylation in cat hearts, including histones, many mitochondrial metabolic enzymes involved in electron transport chain, TCA cycle, malate aspartate shuttle and beta oxidation, as well as cytoskeletal proteins important for muscle function. These results suggest that acetylation defects in hypertrophic stress states can be reversed by HDAC inhibitors and may be useful to improve cardiac structure and function in HFpEF patients.

Project description:Epigenetic methyl-CpG silencing of the ribosomal RNA (rRNA) genes is thought to down-regulate rRNA synthesis in mammals. In contrast, we now show that CpG methylation in fact positively influences rRNA synthesis and processing. Human HCT116 cells, inactivated for DNMT1 and DNMT3b or treated with aza-dC, lack CpG methylation and reactivate a large fraction of normally silent rRNA genes. Unexpectedly, these cells display reduced rRNA synthesis and processing, and accumulate unprocessed 45S rRNA. Reactivation of the rRNA genes is associated with their cryptic transcription by RNA polymerase II. Ectopic expression of cryptic rRNA gene transcripts recapitulates the defects associated with loss of CpG methylation. The data demonstrate that rRNA gene silencing prevents cryptic RNA polymerase II transcription of these genes. Lack of silencing leads to the partial disruption of rRNA synthesis and rRNA processing, providing an unexpected explanation for the cytotoxic effects of loss of CpG methylation. Agilent custom microarray analyses of transcripts from sense and antisense strands of the human rRNA genes present in total nuclear RNA from HCT116-DNMT1-/-;DNMT3b-/- (DKO) and HCT116 (PS) cells. The DKO/PS RNA ratio was normalized within the 5â region of the 45S ribosomal RNA, since this sense coding region was found by quantitative Northern and S1-mapping analyses to equally present in the RNA pools from both cells (as compared to total RNA levels and 18S and 28S levels). The distribution for sense RNAs from the coding region is strongly influenced by the predominant RPI 45S rRNA transcript and hence peaks at 0, the DKO and PS 45S rRNA signals having been normalized. 60-mer probes were designed to tile Human rDNA (GenBank accession U13369) on both strands using ArrayOligoSelector (Wardle et al., 2006). A total of 1,146 different non-overlapping probes (573 for each DNA strand) were designed to cover the 43 kb of human rDNA and each printed in triplicate on the array. The experiment was performed using a dye-swap duplicate analysis. The microarrays were scanned on a G2565CA DNA microarray scanner (Agilent Technologies) and the quantification performed using the Feature Extraction software (Agilent technologies). The data were analyzed using the LIMMA software package in R (Smyth and Speed, 2003).

Dataset Information

Gene expression profiles of HCT116 colorectal carcinoma cells treated with HDAC inhibitors

Publications

Anticolon cancer activity of largazole, a marine-derived tunable histone deacetylase inhibitor.

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