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Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [ChIP-seq, Cut&Tag, ATAC-seq]

ABSTRACT: To further elucidate the role of phospho-HDAC6 LLPS in transcriptional regulation, we performed RNA-seq experiments in TNBC cells treated with Nexturastat A or HDAC6 knockdown

ORGANISM(S): Homo sapiens

PROVIDER: GSE253743 | GEO | 2024/05/09

REPOSITORIES: GEO

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Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [RNA-seq]

Project description:To further elucidate the role of phospho-HDAC6 LLPS in transcriptional regulation, we performed RNA-seq experiments in TNBC cells treated with Nexturastat A or HDAC6 knockdown

2024-05-09 | GSE253744 | GEO

Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [Hi-C]

Project description:To investigate the Nexturastat A effects on chromatin structure which disrupt phospho-HDAC6 LLPS in triple-negative breast cancer (TNBC), we conducted the analysis of Hi-C in TNBC cells treated with or without Nexturastat A.

2024-05-09 | GSE254213 | GEO

Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [RNA-seq]

Project description:Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [RNA-seq]

| PRJNA1066856 | ENA

Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [Hi-C]

Project description:Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [Hi-C]

| PRJNA1069026 | ENA

Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [ChIP-seq, Cut&Tag, ATAC-seq]

Project description:Phase separation of phospho-HDAC6 drives aberrant chromatin architecture in triple-negative breast cancer [ChIP-seq, Cut&Tag, ATAC-seq]

| PRJNA1066853 | ENA

Tubacin mediates the synthetic lethality of cysteine in breast cancer independent on HDAC6

Project description:Triple-negative breast cancer (TNBC) has a highly aggressive nature and distinct molecular characteristics from other subtypes of breast cancer and lacks effective targeted therapy. The molecular and genetic basis of cysteine/cystine dependency in TNBC is complex. We found that cysteine addiction associates with the expression of a set of Claudin genes in TNBC. The Claudin-high TNBCs are independent on cystine, while the Claudin-low TNBCs undergo rapid ferroptosis upon cystine deprivation or inhibition of cystine transport by erastin. To overcome the resistance of Claudin-high TNBC and luminal breast cancer to the potential targeted cystine-addiction therapy, we explored the synthetic lethality of cysteine by an epigenetic compound library screen. Several potent HDAC6 inhibitors were identified and rendered the Claudin-high TNBCs and luminal cancer cells dependent on extracellular cystine and undergoing ferroptosis upon cystine deprivation. The transcriptomic profiling showed that the HDAC6 inhibitor tubacin in combination with erastin activates a synthetic-lethal transcriptional program. Together, we have identified the HDAC6 inhibitors as potent therapy-sensitizers to revive the targeted cysteine-addiction therapy for various subtypes of breast cancer, not limit in the Claudin-low TNBC.

2021-06-02 | GSE154425 | GEO

Hdac6 regulates Tip60-p400 function in stem cells (sequencing)

Project description:The Tip60 (also known as Kat5) lysine acetyltransferase functions broadly as a transcriptional co-activator that acetylates histones. In contrast, Tip60 functions in embryonic stem cells (ESCs) both to silence genes that promote differentiation and to activate genes required for proliferation. The mechanism by which Tip60 functions as a repressor is unknown. Here we show that the class II histone deacetylase Hdac6 co-purifies with Tip60-p400 complex from ESCs and is necessary for complete silencing of most differentiation genes targeted by Tip60. In contrast to differentiated cells, where Hdac6 is mainly cytoplasmic and does not interact with Tip60, Hdac6 is largely nuclear in ESCs and neural stem cells (NSCs) and interacts with Tip60-p400 in both cell types. Hdac6 is enriched at promoters bound by Tip60-p400 in ESCs, but while Tip60 binds on both sides of transcription start sites (TSSs), Hdac6 binding overlaps with only the downstream Tip60 peak. Surprisingly, Hdac6 does not deacetylate histones at these sites, but rather is required for Tip60 binding. These data suggest that nuclear exclusion of Hdac6 during differentiation plays a major role in modulation of Tip60-p400 function. We determined the genome-wide localization of Tip60 and Hdac6 in mouse ES cells, and examined genomic binding profiles of Tip60 and Hdac6 upon indicated knockdown by ChIP-seq. We examined genomic binding profiles of p400 upon indicated knockdown by ChIP-seq.

2013-11-20 | E-GEOD-42209 | biostudies-arrayexpress

HDAC6 Inhibition Disrupts HDAC6-P300 Interaction Reshaping the Cancer Chromatin Landscape (ChIP-Seq)

Project description:Histone deacetylases (HDACs) are crucial regulators of gene expression, DNA synthesis, and cellular processes, making them essential targets in cancer research. HDAC6, specifically, influences protein stability and chromatin dynamics. Despite HDAC6's potential therapeutic value, its exact role in gene regulation and chromatin remodeling needs further clarification. This study examines how HDAC6 inactivation influences lysine acetyltransferase P300 stabilization and subsequent effects on chromatin structure and function in cancer cells. We employed the HDAC6 inhibitor ITF3756, siRNA, or CRISPR/Cas9 gene editing to inactivate HDAC6 in different epigenomic backgrounds. Constantly, this inactivation led to significant changes in chromatin accessibility, particularly increased acetylation of histone H3 lysines 9, 14, and 27 (ATAC-seq and H3K27Ac ChIP-seq analysis). Transcriptomics, proteomics, and gene ontology analysis revealed gene changes in cell proliferation, adhesion, migration, and apoptosis. Significantly, HDAC6 inactivation altered P300 ubiquitination, stabilizing P300 and leading to downregulating genes critical for cancer cell survival. Our study highlights the substantial impact of HDAC6 inactivation on the chromatin landscape of cancer cells and suggests a role for P300 in contributing to the anticancer effects. The stabilization of P300 with HDAC6 inhibition proposes a potential shift in therapeutic focus from HDAC6 itself to its interaction with P300. This finding opens new avenues for developing targeted cancer therapies, improving our understanding of epigenetic mechanisms in cancer cells.

2024-08-19 | GSE273645 | GEO

HDAC6 Inhibition Disrupts HDAC6-P300 Interaction Reshaping the Cancer Chromatin Landscape (ATAC-Seq)

2024-08-19 | GSE273644 | GEO

HDAC6 and HSP90 control the functions of Foxp3+ T regulatory cells

Project description:Foxp3+ T-regulatory cells (Tregs) are key to immune homeostasis such that their diminished numbers or function can cause autoimmunity and allograft rejection. Foxp3+ Tregs express histone/protein deacetylases (HDACs) that regulate chromatin remodeling, gene expression and protein function. Pan-HDAC inhibitors developed for oncology enhance Treg production and suppression but have limited non-oncologic applications given their broad effects. We show, using HDAC6-deficient mice and WT mice treated with HDAC6-specific inhibitors, that HDAC6 inhibition promotes Treg suppressive activity in models of inflammation and autoimmunity, including multiple forms of experimental colitis and fully MHC-incompatible cardiac allograft rejection. Many of the beneficial effects of HDAC6 targeting are also achieved by inhibition of the HDAC6-regulated protein, HSP90. Hence, selective targeting of a single HDAC isoform, HDAC6, or its downstream target, HSP90, can promote Treg-dependent suppression of autoimmunity and transplant rejection. RNA from three independent samples from magnetically separated CD4+CD25+ Treg of HDAC6 knock out, compared to wild type (C57BL6) control

2011-05-01 | E-GEOD-27896 | biostudies-arrayexpress

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