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The histone lysine demethylase Kdm6b is required for activity-dependent preconditioning of hippocampal neuronal survival

ABSTRACT: We profiled basal and bicuculline+4-AP inducible mRNA expression in cultured mouse hippocampal neurons with or without viral shRNA mediated knockdown of Kdm6b

ORGANISM(S): Mus musculus

PROVIDER: GSE58398 | GEO | 2014/06/12

SECONDARY ACCESSION(S): PRJNA252502

REPOSITORIES: GEO

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The histone lysine demethylase Kdm6b is required for activity-dependent preconditioning of hippocampal neuronal survival

Project description:We profiled basal and bicuculline+4-AP inducible mRNA expression in cultured mouse hippocampal neurons with or without viral shRNA mediated knockdown of Kdm6b We harvested mRNA from neurons under four conditions (pLKO vector/treatment control, pLKO vector/3hr bicuculline+4AP, Kdm6b knockdown/treatment control,Kdm6b knockdown/3hr bicuculline+4AP). Libraries were generated and used for RNA sequencing.

2014-06-12 | E-GEOD-58398 | biostudies-arrayexpress

The histone lysine demethylase Kdm6b is required for activity-dependent preconditioning of hippocampal neuronal survival.

Project description: Not available

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Histone lysine demethylase JMJD3/KDM6B is required for the establishment of adult hippocampal neurogenesis

Project description:Mutations in the JMJD3 (KDM6B) chromatin regulator are causally associated with autism spectrum disorder and syndromic intellectual disability, but the neurodevelopmental roles of this histone 3 lysine 27 (H3K27) demethylase are poorly understood. Neural stem cells (NSCs) in the hippocampal dentate gyrus (DG) generate new granule neurons throughout life, and deficits in DG neurogenesis are associated with cognitive and behavioral problems. Here we show that Jmjd3 is required for the establishment of adult neurogenesis in the mouse DG. Conditional deletion of Jmjd3 in embryonic DG precursors results in an adult hippocampus that is essentially devoid of NSCs. While early postnatal mice with Jmjd3-deletion have near normal numbers of DG NSCs, at later stages, Jmjd3-deleted NSCs fail to propagate normally. In addition to the loss of NSCs during postnatal development, neurogenesis from Jmjd3-deleted NSCs is impaired, corresponding to defective neurogenic gene expression. Without Jmjd3, NeuroD2 and Bcl11b(Ctip2) are not properly expressed and exhibit increased levels of H3K27me3, underscoring the role of Jmjd3 in the regulation of transcription for neuronal differentiation. Thus, these data indicate that Jmjd3 plays dual roles in postnatal DG neurogenesis, being critical for the establishment of the NSC pool as well as the differentiation of young DG granule neurons. More broadly, our results suggest a neurodevelopmental link between JMJD3 mutations and hippocampal dysfunction, providing new insights into how mutations in chromatin regulators may contribute to learning disorders.

2021-04-01 | GSE73706 | GEO

Lysine Demethylase 6b (Kdm6b) is essential for proper generation of effector CD8+ T lymphocytes by inducing chromatin accessibility in effector-associated genes

Project description:The transcriptional and epigenetic regulation of CD8+ T cell differentiation is critical for balancing pathogen eradication and long-term immunity by effector and memory CTLs. Here, we demonstrate that the Lysine Demethylase 6b (Kdm6b) is essential for the proper generation and function of effector CD8+ T cells during acute infection and tumor eradication. We found that cells lacking Kdm6b (either T cell-specific KO or knockdown utilizing shRNA strategies) show an enhanced generation of memory precursor and early effector cells upon acute viral infection in a cell-intrinsic manner. We also demonstrate that Kdm6b is indispensable for proper effector functions and tumor protection, and that memory CD8+ T cells lacking Kdm6b displayed a defective recall response. Mechanistically, we identified that Kdm6b, through induction of chromatin accessibility in key effector-associated gene loci, allows for the proper generation of effector CTLs. Our results pinpoint the essential function of Kdm6b in allowing chromatin accessibility in effector-associated genes, and identify Kdm6b as a potential target for therapeutics in diseases with dysregulated effector responses.

2021-02-25 | GSE161842 | GEO

Loss of histone demethylase KDM6B enhances aggressiveness of pancreatic cancer through downregulation of C/EBPα

Project description:Genetic mutations in pancreatic ductal adenocarcinoma (PDAC) with critical roles have been well examined. The recent discovery of alterations in genes encoding histone modifiers suggests their possible roles in the complexity of cancer development. We previously reported loss of heterozygosity of the KDM6B gene, which encodes a histone demethylase for trimethylated histone H3 lysine 27 (H3K27me3), a repressive chromatin mark, in PDAC cells. In this study, we demonstrated that loss of KDM6B enhanced aggressiveness of PDAC cells. KDM6B has been regarded as a tumor suppressor that mediates oncogenic KRAS-induced senescence. Consistently, KDM6B was highly expressed in pancreatic precancerous lesions (pancreatic intraepithelial neoplasms); then, the expression decreased as the malignant grade progressed. We found that knockdown of KDM6B in PDAC cells promoted tumor sphere formation and increased peritoneal dissemination and liver metastasis in vivo. Microarray and chromatin immunoprecipitation analysis implicated CEBPA for aggressiveness induced by KDM6B knockdown. CEBPA knockdown recapitulated the phenotypic change of PDAC cells after KDM6B knockdown, which was reversed by forced expression of C/EBPα. Moreover, similar protein expression patterns of KDM6B and C/EBPα in human PDAC emphasized their functional correlation. Notably, pharmacological inhibition of the H3K27 methylase EZH2 in PDAC cells inhibited tumor sphere formation along with the upregulation of CEBPA expression, and this effect was impaired in KDM6B knockdown cells, highlighting the role for KDM6B in the activation of CEBPA. Together, our results propose a significant role for the KDM6B-C/EBPα axis in the PDAC phenotype.

2014-06-30 | GSE28155 | GEO

The histone lysine demethylase JMJD3/KDM6B is recruited to p53 bound promoters and enhancer elements in a p53 dependent manner

Project description:The JmjC domain containing protein JMJD3/KDM6B catalyses H3K27me3 and H3K27me2 demethylation. JMJD3 appears to be highly regulated at the transcriptional level and is upregulated in response to diverse stimuli such as differentiation inducers and stress signals. Accordingly, JMJD3 has been linked to the regulation of different biological processes such as differentiation of embryonic stem cells, inflammatory responses in macrophages, and induction of cellular senescence via regulation of the INK4A-ARF locus. Here we show here that JMJD3 interacts with the tumour suppressor protein p53. We find that the interaction is dependent on the p53 tetramerization domain. Following DNA damage, JMJD3 is transcriptionally upregulated and by performing genome-wide mapping of JMJD3, we demonstrate that it binds genes involved in basic cellular processes, as well as genes regulating cell cycle, response to stress and apoptosis. Moreover, we find that JMJD3 binding sites show significant overlap with p53 bound promoters and enhancer elements. The binding of JMJD3 to p53 target sites is increased in response to DNA damage, and we demonstrate that the recruitment of JMJD3 to these sites is dependent on p53 expression. Therefore, we propose a model in which JMJD3 is recruited to p53 responsive elements via its interaction with p53 and speculate that JMJD3 could act as a fail-safe mechanism to remove low levels of H3K27me3 and H3K27me2 to allow for efficient acetylation of H3K27. Examination of JMJD3 and p53 genome-wide binding in untreated BJ cells or cells exposed to DNA damage (IR, 10 Gy)

2014-06-11 | E-GEOD-55912 | biostudies-arrayexpress

KDM4B- and KDM6B-regulated genes in human mesenchymal stem cell osteogenic differentiation

Project description:To investigate how histone demethylases KDM4B and KDM6B may be involved in osteogenic commitment of mesenchymal stem cells (MSCs), we performed gene expression profiling and comparison on control, KDM4B- and KDM6B-knockdown MSCs at different stages of osteogenic differentiation. Human MSCs infected with scramble shRNAs, shRNAs against KDM4B or KDM6B are treated with BMP4/7 for 0, 4 and 24hrs. Total RNA were extracted from these 9 samples.

2012-07-31 | E-GEOD-36970 | biostudies-arrayexpress

KDM6B-induced gene expression changes in transfected CD10-positive GC B cells

Project description:In this study, we have investigated the effect of lysine-specific demethylase 6B (KDM6B) on gene expression in normal human germinal center (GC) B cells using a non-viral vector-based system. Gene expression was compared between KDM6B-transfected and control vector-transfected GC B cells from three patients. RNA from the MACS-sorted transfected GC B cells was amplified. 10ug of fragmented cRNA was hybridized to HG-U133 Plus 2.0 microarrays. Differentially expressed genes were identified using Affymetrix GCOS pairwise analysis.

2011-07-26 | E-GEOD-24044 | biostudies-arrayexpress

Critical role of histone H3 lysine 27 demethylase Kdm6b in the homeostasis and function of medullary thymic epithelial cells.

Project description: Not available

| S-EPMC7493893 | biostudies-literature

Human histone demethylase KDM6B can catalyse sequential oxidations.

Project description: Not available

| S-EPMC6044289 | biostudies-literature