p53 is regulated by the lysine demethylase LSD1

Huang, Jing; Sengupta, Roopsha; Espejo, Alexsandra; Lee, Min Gyu; Dorsey, Jean; Richter, Mario; Opravil, Susanne; Shiekhattar, Ramin; Bedford, Mark T.; Jenuwein, Thomas; Berger, Shelley L.

doi:10.1038/nature06092

Cited by 733 publications

(693 citation statements)

References 28 publications

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“…Equal amounts of GST or GST fusion proteins were incubated with glutathione-Sepharose 4B beads (GE Healthcare) and then washed three times with TEN buffer (20-mM Tris at pH 7.4, 0.1 mM EDTA and 100 mM NaCl). 40 Flag fusion proteins purified from HEK-293T cells was incubated with GST or GST fusion proteins. The beads were washed three times with TENT buffer (0.5% Nonidet P-40, 20 mM Tris at pH7.4, 0.1 mM EDTA and 300 mM NaCl) and analyzed by western blotting with anti-Flag or anti-GST antibody.…”

Section: Discussionmentioning

confidence: 99%

JMJD3 promotes SAHF formation in senescent WI38 cells by triggering an interplay between demethylation and phosphorylation of RB protein

et al. 2015

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Primary human fibroblasts undergoing oncogene-induced or replicative senescence are known to form senescence-associated heterochromatin foci (SAHF), which can stabilize the state of senescence. The retinoblastoma (RB) protein has an important role in SAHF; cells that lack active RB pathway fail to form SAHF. It has been known that the posttranslational modifications of RB, for example, phosphorylation, regulate its function. To date, whether methylation of RB impacts on the SAHF formation is unknown. Here we report that JMJD3, a histone demethylase catalyzing the tri-methylation of H3K27 (H3K27me3), can demethylate the nonhistone protein RB at the lysine810 residue (K810), which is a target of the methyltransferase Set7/9. We detected a significant upregulation of JMJD3 during cellular senescence and SAHF formation in WI38 cells induced by H-RasV 12 , and we found that ectopic expression of JMJD3 promoted cellular senescence and SAHF formation in WI38 cells. Furthermore, during the process of SAHF assembly, JMJD3 was transported to the cytoplasm and interacted with RB through its demethylase domain JmjC. Significantly, our data demonstrated that the JMJD3-mediated demethylation of RB at K810 impeded the interaction of RB with the protein kinase CDK4 and resulted in reduced level of phosphorylation of RB at Serine807/811 (S807/811), implicating an important role of the interplay between the demethylation and phosphorylation of RB in SAHF assembly. This study highlights the role of JMJD3 as a novel inducer of SAHF formation through demethylating RB and provides new insights into the mechanisms of cellular senescence and SAHF assembly. Cellular senescence is an irreversible process of cell cycle arrest. The senescent cells remain metabolically active but are unable to express genes required for cell proliferation. 1,2 The known causes of cellular senescence include telomere shortening, oxidative stress, DNA damage and hyperoncogenic signaling. 3 H-RasV 12 has been used as a model to induce senescence in normal cells. [4][5][6] Senescent cells are typically characterized by a large flat morphology and the expression of a senescence-associated β-galactosidase activity (SA-β-gal), and nuclei of senescence cells may remodel to form the heterochromatin structures termed the senescenceassociated heterochromatin foci (SAHF). 7 SAHF are condensed regions of DNA that correlate with transcriptionally inactive sites. 8 These heterochromatin foci are hallmarked by H3K9me3 and the incorporation of heterochromatin protein HP1, macroH2A, PML (promyelocy leukemia protein) and HMGA1 (high mobility group AT-hook 1). 7,9-11 Recently, it has been shown that repressive markers, such as H3K9me3, H3K9me2 and H3K27me3, are rearranged into the nonoverlapping structural layers in SAHF. 12-14 Changes of heterochromatin organization generate a repressive chromatin environment that prevents transcription of genes that promote growth, thereby stabilize the state of senescence. 7,15 The retinoblastoma (RB) tumor suppressor is an important senesc...

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Section: Discussionmentioning

confidence: 99%

JMJD3 promotes SAHF formation in senescent WI38 cells by triggering an interplay between demethylation and phosphorylation of RB protein

et al. 2015

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“…Through demethylation of Lys370 in p53, LSD1 blocks p53 proapoptotic activity while knockdown of LSD1 increases p21 CIP1 and MDM2, well known p53 target genes. 22 However, the potential roles of LSD1 are not always oncogenic. Wang et al showed that the LSD1 and Mi-2/nucleosome remodeling and deacetylase (NuRD) complexes are involved in repression of TGFb-1 signaling pathway that is critically involved in epithelial mesenchymal transition and tumor invasion.…”

Section: Lsd1/kdm1amentioning

confidence: 99%

Epigenetic regulation of cancer growth by histone demethylases

Lim

Metzger

Schüle

et al. 2010

Intl Journal of Cancer

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Cancer is traditionally viewed as a primarily genetic disorder. However, it is now increasingly apparent that epigenetic abnormalities play a fundamental role in cancer development. Aberrant expression of histone-modifying enzymes has been implicated in the course of tumor initiation and progression. The discovery of a large number of histone demethylases suggests an important role for dynamic regulation of histone methylation in biological processes. The observation that overexpression, amplification or mutations of several histone demethylases have been found in many types of tumors, raise the possibility of using these enzymes as diagnostic tools as well as pave a way for the discovery of novel therapeutic targets and treatment modalities. Here, we review the current knowledge of the potential role of H3K4, H3K9 and H3K27 histone demethylases in tumorigenesis.Recently, it has become apparent that not only genetic mutations but also epigenetic alterations lead to the activation of oncogenes and the loss of function of tumor-suppressor genes. Since epigenetic abnormalities in DNA methylation patterns as well as histone modifications are potentially reversible in contrast to gene mutations, much effort has been directed toward understanding the mechanism of epigenetic aberration to develop epigenetic therapies. Indeed, inhibitors of histone deacetylases (HDACs) and DNA methyltransferases (DNMTs) have been approved for treatment of certain types of cancers. Recently, overexpression, amplification or mutations of several histone demethylases have been linked to many types of tumor, raising the possibility of using these enzymes as diagnostic tools and therapeutic targets. Here, we focus mainly on the potential role of some selected histone lysine demethylases in tumorigenesis.The N-terminal tails of histones are subjected to several types of post-translational modifications, including acetylation, methylation, phosphorylation and ubiquitination. The combination of these modifications determines chromatin structure and transcriptional activation or repression of genes. In contrast to other histone modifications, the importance of histone methylations is highlighted because of their enormously specific dynamics with respect to gene regulation. Histone lysine residues on histone H3 and H4 (H3K4, H3K9, H3K27, H3K36, H3K79 and H4K20) can become mono-, dior trimethylated. These modifications are regulated by two classes of enzymes with opposing activities: histone methyltransferases and histone lysine demethylases. LSD1, also known as AOF2 and KDM1, is the first discovered histone lysine demethylase that belongs to the flavin adenine dinucleotide-dependent enzyme family. 1 Subsequently, another family of histone lysine demethylases structurally different from LSD1 was described, all of which sharing the conserved jumonji C (JmjC) domain (Table 1). H3K4 Demethylases in Cancer LSD1/KDM1ATri-and dimethylated H3K4 (H3K4me3/2) are often found at actively transcribed genes. Although H3K4me3 is highly enriched around transcrip...

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“…48,49 p53 and ER have been functionally and physically related to proteins involved in chromatin methyl mark changes, such as G9a and LSD1. [50][51][52][53][54][55] However, the outcome of the induced epigenetic changes is variable. For example, G9a, considered the major euchromatin H3K9 methyltransferase, can act both as corepressor and as a coactivator for nuclear receptor functions, in cooperation with CARM1 and p300.…”

Section: Methodsmentioning

confidence: 99%