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Lee HW, Choi JH, Seo D, Gavaachimed L, Choi J, Park S, Min NY, Lee DH, Bang HW, Ham SW, Kim JW, Lee SC, Rhee S, Seo SB, Lee KH. EGCG-induced selective death of cancer cells through autophagy-dependent regulation of the p62-mediated antioxidant survival pathway. Biochim Biophys Acta Mol Cell Res 2024; 1871:119659. [PMID: 38216089 DOI: 10.1016/j.bbamcr.2024.119659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/22/2023] [Accepted: 12/29/2023] [Indexed: 01/14/2024]
Abstract
The effects of EGCG on the selective death of cancer cells by modulating antioxidant pathways through autophagy were explored in various normal and cancer cells. EGCG positively regulated the p62-KEAP1-NRF2-HO-1 pathway in normal cells, while negatively regulating it in cancer cells, leading to selective apoptotic death of cancer cells. In EGCG-treated MRC5 cells (EGCG-MRC5), autophagic flux was blocked, which was accompanied by the formation of p62-positive aggregates. However, EGCG-treated HeLa cells (EGCG-HeLa) showed incomplete autophagic flux and no aggregate formation. The levels of P-ULK1 S556 and S758 increased in EGCG-MRC5 through AMPK-mTOR cooperative interaction. In contrast, EGCG treatment in HeLa cells led to AMPK-induced mTOR inactivation, resulting in abrogation of P-ULK1 S556 and S758 levels. AMPK knockout in EGCG-HeLa restored positive regulation of the p62-mediated pathway, which was accompanied by increased P-mTOR S2448 and P-ULK1 S758 levels. Knockdown of 67LR in EGCG-HeLa abolished AMPK activity but did not restore the p62-mediated pathway. Surprisingly, both AMPK knockout and 67LR knockdown in EGCG-HeLa markedly increased cell viability, despite differential regulation of the antioxidant enzyme HO-1. In conclusion, EGCG induces the selective death of cancer cells through the modulation of at least two autophagy-dependent and independent regulatory pathways: negative regulation involves the mTOR-ULK1 (S556 and S758)-p62-KEAP1-NRF2-HO-1 axis via AMPK activation, whereas positive regulation occurs through the 67LR-AMPK axis.
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Affiliation(s)
- Ho Woon Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Jee-Hye Choi
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Dongbeom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Lkhagvasuren Gavaachimed
- Department of Science of Cultural Properties, Graduate School, Chung-Ang University, Seoul, Republic of Korea
| | - Jaesung Choi
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Sehwan Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Na Young Min
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Dong Ho Lee
- Da Vinci College of General Education, Chung-Ang University, Seoul, Republic of Korea
| | - Hyo-Weon Bang
- Department of Physiology, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Seung Wook Ham
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Jung-Woong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Sung Chul Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Sangmyung Rhee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Kwang-Ho Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea; Department of Science of Cultural Properties, Graduate School, Chung-Ang University, Seoul, Republic of Korea.
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Choi J, Choi JH, Lee HW, Seo D, Lkhagvasuren G, Kim JW, Seo SB, Lee K, Lee KH. KPNA3 promotes epithelial-mesenchymal transition by regulating TGF-β and AKT signaling pathways in MDA-MB-231, a triple-negative breast cancer cell line. BMB Rep 2023; 56:120-125. [PMID: 36593106 PMCID: PMC9978358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Indexed: 01/04/2023] Open
Abstract
Karyopherin-α3 (KPNA3), a karyopherin- α isoform, is intimately associated with metastatic progression via epithelial-mesenchymal transition (EMT). However, the molecular mechanism underlying how KPNA3 acts as an EMT inducer remains to be elucidated. In this report, we identified that KPNA3 was significantly upregulated in cancer cells, particularly in triple-negative breast cancer, and its knockdown resulted in the suppression of cell proliferation and metastasis. The comprehensive transcriptome analysis from KPNA3 knockdown cells indicated that KPNA3 is involved in the regulation of numerous EMTrelated genes, including the downregulation of GATA3 and E-cadherin and the up-regulation of HAS2. Moreover, it was found that KPNA3 EMT-mediated metastasis can be achieved by TGF-β or AKT signaling pathways; this suggests that the novel independent signaling pathways KPNA3-TGF-β-GATA3-HAS2/E-cadherin and KPNA3-AKT-HAS2/E-cadherin are involved in the EMT-mediated progress of TNBC MDA-MB-231 cells. These findings provide new insights into the divergent EMT inducibility of KPNA3 according to cell and cancer type. [BMB Reports 2023; 56(2): 120-125].
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Affiliation(s)
- Jaesung Choi
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Jee-Hye Choi
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Ho Woon Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Dongbeom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Gavaachimed Lkhagvasuren
- Department of Science of Cultural Heritage, Graduate School, Chung-Ang University, Seoul 06974, Korea
| | - Jung-Woong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Kangseok Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea
| | - Kwang-Ho Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea, Seoul 06974, Korea,Department of Science of Cultural Heritage, Graduate School, Chung-Ang University, Seoul 06974, Korea,Corresponding author. Tel: +82-2-820-5213; Fax: +82-2-825-5206; E-mail:
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Choi J, Choi JH, Lee HW, Seo D, Lkhagvasuren G, Kim JW, Seo SB, Lee K, Lee KH. KPNA3 promotes epithelial–mesenchymal transition by regulating TGF-β and AKT signaling pathways in MDA-MB-231, a triple-negative breast cancer cell line. BMB Rep 2022. [DOI: 10.5483/bmbrep.2022-0180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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Kim SH, Park J, Park JW, Hahm JY, Yoon S, Hwang IJ, Kim KP, Seo SB. SET7-mediated TIP60 methylation is essential for DNA double-strand break repair. BMB Rep 2022; 55:541-546. [PMID: 35880433 PMCID: PMC9712704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Indexed: 12/14/2022] Open
Abstract
The repair of DNA double-strand breaks (DSBs) by homologous recombination (HR) is crucial for maintaining genomic integrity and is involved in numerous fundamental biological processes. Post-translational modifications by proteins play an important role in regulating DNA repair. Here, we report that the methyltransferase SET7 regulates HR-mediated DSB repair by methylating TIP60, a histone acetyltransferase and tumor suppressor involved in gene expression and protein stability. We show that SET7 targets TIP60 for methylation at K137, which facilitates DSB repair by promoting HR and determines cell viability against DNA damage. Interestingly, TIP60 demethylation is catalyzed by LSD1, which affects HR efficiency. Taken together, our findings reveal the importance of TIP60 methylation status by SET7 and LSD1 in the DSB repair pathway. [BMB Reports 2022; 55(11): 541-546].
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Affiliation(s)
- Song Hyun Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Junyoung Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Seobin Yoon
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - In Jun Hwang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Keun Pil Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea,Corresponding author. Tel: +82-2-820-5242; Fax: +82-2-822-4039; E-mail:
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5
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Kim SH, Park J, Park JW, Hahm JY, Yoon S, Hwang IJ, Kim KP, Seo SB. SET7-mediated TIP60 methylation is essential for DNA double-strand break repair. BMB Rep 2022; 55:541-546. [PMID: 35880433 PMCID: PMC9712704 DOI: 10.5483/bmbrep.2022.55.11.080] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 05/23/2022] [Accepted: 07/05/2022] [Indexed: 08/13/2023] Open
Abstract
The repair of DNA double-strand breaks (DSBs) by homologous recombination (HR) is crucial for maintaining genomic integrity and is involved in numerous fundamental biological processes. Post-translational modifications by proteins play an important role in regulating DNA repair. Here, we report that the methyltransferase SET7 regulates HR-mediated DSB repair by methylating TIP60, a histone acetyltransferase and tumor suppressor involved in gene expression and protein stability. We show that SET7 targets TIP60 for methylation at K137, which facilitates DSB repair by promoting HR and determines cell viability against DNA damage. Interestingly, TIP60 demethylation is catalyzed by LSD1, which affects HR efficiency. Taken together, our findings reveal the importance of TIP60 methylation status by SET7 and LSD1 in the DSB repair pathway. [BMB Reports 2022; 55(11): 541-546].
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Affiliation(s)
- Song Hyun Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Junyoung Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Seobin Yoon
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - In Jun Hwang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Keun Pil Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
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Hong YJ, Park J, Hahm JY, Kim SH, Lee DH, Park KS, Seo SB. Regulation of UHRF1 acetylation by TIP60 is important for colon cancer cell proliferation. Genes Genomics 2022; 44:1353-1361. [PMID: 35951156 PMCID: PMC9569301 DOI: 10.1007/s13258-022-01298-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/22/2022] [Indexed: 11/28/2022]
Abstract
Background Ubiquitin-like with PHD and RING finger domains 1 (UHRF1) is upregulated in colon cancer cells and associated with silencing tumor suppressor genes (TSGs) to promote colon cancer cell proliferation. Objective To investigate epigenetic modification of UHRF1 by TIP60. Whether UHRF1 acetylation by TIP60 can induce cell proliferation in colon cancer cells. Methods Acetylation sites of UHRF1 by TIP60 was predicted by ASEB (Acetylation Set Enrichment Based) method and identified by immunoprecipitation assay using anti-pan-acetyl lysine antibody and in vitro acetylation assay. Based on this method, UHRF1 acetylation-deficient mimic 4KR (K644R, K646R, K648R, K650R) mutant was generated to investigate effects of UHRF1 acetylation by TIP60. shRNA system was used to generate stable knockdown cell line of UHRF1. With transient transfection of UHRF1 WT and 4KR, the effects of UHRF1 4KR mutant on Jun dimerization protein 2 (JDP2) gene expression, cell proliferation and cell cycle were investigated by RT-qPCR and FACS analysis in shUHRF1 colon cancer cell line. Results Downregulation of TIP60-mediated UHRF1 acetylation is correlated with suppressed cell cycle progression. Acetylation-deficient mimic of UHRF1 showed poor cell growth through increased expression of JDP2 gene. Conclusions Acetylation of UHRF1 4K residues by TIP60 is important for colon cancer cell growth. Furthermore, upregulated JDP2 expression by acetylation-deficient mutant of UHRF1 might be an important epigenetic target for colon cancer cell proliferation.
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Affiliation(s)
- Ye Joo Hong
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, South Korea
| | - Junyoung Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, South Korea
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, South Korea
| | - Song Hyun Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, South Korea
| | - Dong Ho Lee
- Da Vinci College of General Education, Chung-Ang University, 06974, Seoul, South Korea
| | - Kwon-Sik Park
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia School of Medicine, 22908, Charlottesville, VA, USA
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, South Korea.
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Kim HJ, Park JW, Kang JY, Seo SB. Negative Regulation of Erythroid Differentiation via the CBX8-TRIM28 Axis. Mol Cells 2021; 44:444-457. [PMID: 34253692 PMCID: PMC8334346 DOI: 10.14348/molcells.2021.0012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 04/25/2021] [Accepted: 04/29/2021] [Indexed: 12/26/2022] Open
Abstract
Although the mechanism of chronic myeloid leukemia (CML) initiation through BCR/ABL oncogene has been well characterized, CML cell differentiation into erythroid lineage cells remains poorly understood. Using CRISPR-Cas9 screening, we identify Chromobox 8 (CBX8) as a negative regulator of K562 cell differentiation into erythrocytes. CBX8 is degraded via proteasomal pathway during K562 cell differentiation, which activates the expression of erythroid differentiation-related genes that are repressed by CBX8 in the complex of PRC1. During the differentiation process, the serine/threonine-protein kinase PIM1 phosphorylates serine 196 on CBX8, which contributes to CBX8 reduction. When CD235A expression levels are analyzed, the result reveals that the knockdown of PIM1 inhibits K562 cell differentiation. We also identify TRIM28 as another interaction partner of CBX8 by proteomic analysis. Intriguingly, TRIM28 maintains protein stability of CBX8 and TRIM28 loss significantly induces proteasomal degradation of CBX8, resulting in an acceleration of erythroid differentiation. Here, we demonstrate the involvement of the CBX8-TRIM28 axis during CML cell differentiation, suggesting that CBX8 and TRIM28 are promising novel targets for CML research.
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Affiliation(s)
- Hyun Jeong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
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Kim YG, Bak MS, Kim A, Kim Y, Chae YC, Kim YL, Chun YS, An JY, Seo SB, Kim SJ, Lee YS. Kdm3b haploinsufficiency impairs the consolidation of cerebellum-dependent motor memory in mice. Mol Brain 2021; 14:106. [PMID: 34217333 PMCID: PMC8254933 DOI: 10.1186/s13041-021-00815-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 06/16/2021] [Indexed: 11/10/2022] Open
Abstract
Histone modifications are a key mechanism underlying the epigenetic regulation of gene expression, which is critically involved in the consolidation of multiple forms of memory. However, the roles of histone modifications in cerebellum-dependent motor learning and memory are not well understood. To test whether changes in histone methylation are involved in cerebellar learning, we used heterozygous Kdm3b knockout (Kdm3b+/-) mice, which show reduced lysine 9 on histone 3 (H3K9) demethylase activity. H3K9 di-methylation is significantly increased selectively in the granule cell layer of the cerebellum of Kdm3b+/- mice. In the cerebellum-dependent optokinetic response (OKR) learning, Kdm3b+/- mice show deficits in memory consolidation, whereas they are normal in basal oculomotor performance and OKR acquisition. In addition, RNA-seq analyses revealed that the expression levels of several plasticity-related genes were altered in the mutant cerebellum. Our study suggests that active regulation of histone methylation is critical for the consolidation of cerebellar motor memory.
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Affiliation(s)
- Yong Gyu Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Korea
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Myeong Seong Bak
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Korea
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Ahbin Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Korea
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Yujin Kim
- Department of Biosystems and Biomedical Sciences, College of Health Sciences, Korea University, Seoul, 02841, Korea
- Department of Integrated Biomedical and Life Sciences, College of Health Sciences, Korea University, Seoul, Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Science, Chung-Ang University, Seoul, 06974, Korea
| | - Ye Lee Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea
- Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Yang-Sook Chun
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Korea
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea
- Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Joon-Yong An
- Department of Biosystems and Biomedical Sciences, College of Health Sciences, Korea University, Seoul, 02841, Korea
- Department of Integrated Biomedical and Life Sciences, College of Health Sciences, Korea University, Seoul, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Science, Chung-Ang University, Seoul, 06974, Korea
| | - Sang Jeong Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Korea.
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea.
- Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, 03080, Korea.
| | - Yong-Seok Lee
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Korea.
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea.
- Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, 03080, Korea.
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Hahm JY, Park JW, Kang JY, Park J, Kim CH, Kim JY, Ha NC, Kim JW, Seo SB. Acetylation of UHRF1 Regulates Hemi-methylated DNA Binding and Maintenance of Genome-wide DNA Methylation. Cell Rep 2021; 32:107958. [PMID: 32726623 DOI: 10.1016/j.celrep.2020.107958] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 05/14/2020] [Accepted: 07/02/2020] [Indexed: 11/28/2022] Open
Abstract
UHRF1 is a key regulator in DNA methylation maintenance. It binds histone H3K9me2/3 and hemi-methylated DNA and recruits DNMT1 to DNA replication forks during S phase. However, the regulatory mechanism of hemi-methylated DNA binding activity of UHRF1 remains unknown. In this study, we reveal that acetylation of UHRF1 is regulated by PCAF and HDAC1. We show that UHRF1 acetylation at K490 attenuates its binding affinity to hemi-methylated DNA. We analyze genome-wide DNA methylation and gene-expression patterns using stable cell lines and discover that cells where the endogenous UHRF1 is replaced with an acetyl-mimetic (UHRF1 K490Q) mutant show deficiencies in inherited DNA methylation and show different gene-expression patterns in genes related to cell survival. These results reveal that precise regulation of UHRF1 acetylation is required to maintain DNA methylation during cell division and control cell survival.
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Affiliation(s)
- Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Junyoung Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Chul-Hong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Nam-Chul Ha
- Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Republic of Korea
| | - Jung-Woong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea.
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Kang SY, Go ES, Seo SB, Kim HW, Keel SI, Lee SH. A comparative evaluation of recarbonated CaCO 3 derived from limestone under oxy-fuel circulating fluidized bed conditions. Sci Total Environ 2021; 758:143704. [PMID: 33243493 DOI: 10.1016/j.scitotenv.2020.143704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 10/30/2020] [Accepted: 11/08/2020] [Indexed: 06/11/2023]
Abstract
SO2 emissions from coal-fired boilers are air pollutants and a source of acid rain, causing extensive environmental pollution. Limestone (CaCO3) is a Ca-based sorbent which is injected into circulating fluidized bed (CFB) boilers, where it combines with SO2 to produce calcium sulfate (CaSO4). As a result, SO2 emissions from a power plant are reduced. In this study, CaCO3 addition was proposed and the desulfurization efficiency improved. The direct desulfurization reaction is dominant in a commercial CFB boiler due to the high CO2 partial pressure, but CaO is formed at a fast reaction rate by calcination in the high temperature or in the low CO2 partial pressure region. When CaO remains in the loop seal, it is exposed to a high CO2 partial pressure condition moving through the recirculation section for an extended period and re-injected into the furnace as recarbonated CaCO3. To analyze the direct desulfurization reaction kinetics, a shrink core model in which the reaction proceeds inside the particle was adopted. Surface observations through FE-SEM of CaSO4 produced by the 180 minute long desulfurization experiment using TGA suggest that the CaSO4 crystal growth rate increased after the pre-treatment (recarbonation) of limestone. Recarbonation lowered the limestone crystallinity, causing a faster reaction. The CaCO3 recarbonation increased the Ca utilization by more than 20% when the direct desulfurization reaction occurred. The TGA experiments show that recarbonation contributes to CaSO4 conversion. Increasing the desulfurization efficiency using recarbonation can reduce the fixed investment and operating costs of oxy-fuel CFB plants because only desulfurization in the furnace is able to meet SO2 emission regulations or lower the flue gas desulfurization (FGD) dependence. Accordingly, the desulfurization conversions of recarbonated CaCO3 and limestone were compared in this study. Morphological changes in the limestone were also evaluated using XRD, FE-SEM, and other analysis methods.
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Affiliation(s)
- S Y Kang
- Department of Mineral Resource and Energy Engineering, Jeonbuk National University, Jeonju-si, Jellabuk-do 54896, Republic of Korea
| | - E S Go
- Department of Mineral Resource and Energy Engineering, Jeonbuk National University, Jeonju-si, Jellabuk-do 54896, Republic of Korea
| | - S B Seo
- Department of Mineral Resource and Energy Engineering, Jeonbuk National University, Jeonju-si, Jellabuk-do 54896, Republic of Korea
| | - H W Kim
- Department of Mineral Resource and Energy Engineering, Jeonbuk National University, Jeonju-si, Jellabuk-do 54896, Republic of Korea
| | - S I Keel
- Environment System Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejon 34103, Republic of Korea
| | - S H Lee
- Department of Mineral Resource and Energy Engineering, Jeonbuk National University, Jeonju-si, Jellabuk-do 54896, Republic of Korea.
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Kang JY, Park JW, Hahm JY, Jung H, Seo SB. Histone H3K79 demethylation by KDM2B facilitates proper DNA replication through PCNA dissociation from chromatin. Cell Prolif 2020; 53:e12920. [PMID: 33029857 PMCID: PMC7653264 DOI: 10.1111/cpr.12920] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/25/2020] [Accepted: 09/11/2020] [Indexed: 12/16/2022] Open
Abstract
Objectives The level of histone H3 lysine 79 methylation is regulated by the cell cycle and involved in cell proliferation. KDM2B is an H3K79 demethylase. Proliferating cell nuclear antigen (PCNA) is a component of the DNA replication machinery. This study aimed at elucidating a molecular link between H3K79me recognition of PCNA and cell cycle control. Materials and methods We generated KDM2B‐depleted 293T cells and histone H3‐K79R mutant‐expressing 293T cells. Western blots were primarily utilized to examine the H3K79me level and its effect on subsequent PCNA dissociation from chromatin. We applied IP, peptide pull‐down, isothermal titration calorimetry (ITC) and ChIP experiments to show the PCNA binding towards methylated H3K79 and DNA replication origins. Flow cytometry, MTT, iPOND and DNA fibre assays were used to assess the necessity of KDM2B for DNA replication and cell proliferation. Results We revealed that KDM2B‐mediated H3K79 demethylation regulated cell cycle progression. We found that PCNA bound chromatin in an H3K79me‐dependent manner during S phase. KDM2B was responsible for the timely dissociation of PCNA from chromatin, allowing to efficient DNA replication. Depletion of KDM2B aberrantly enriched chromatin with PCNA and caused slow dissociation of residual PCNA, leading to a negative effect on cell proliferation. Conclusions We suggested a novel interaction between PCNA and H3K79me. Thus, our findings provide a new mechanism of KDM2B in regulation of DNA replication and cell proliferation.
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Affiliation(s)
- Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Korea
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Korea
| | - Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Korea
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12
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Park JW, Kang JY, Hahm JY, Kim HJ, Seo SB. Proteosomal degradation of NSD2 by BRCA1 promotes leukemia cell differentiation. Commun Biol 2020; 3:462. [PMID: 32826945 PMCID: PMC7443147 DOI: 10.1038/s42003-020-01186-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 07/30/2020] [Indexed: 11/12/2022] Open
Abstract
The human myelogenous leukemic cell line, K562 undergoes erythroid differentiation by exposure to hemin. Here, we uncovered NSD2 as an innate erythroid differentiation-related factor through a genome-wide CRISPR library screen and explored the regulatory role of NSD2 during myeloid leukemia cell differentiation. We found that NSD2 stability was disrupted by poly-ubiquitination in differentiated K562 cells. Proteomic analysis revealed an interaction between NSD2 and an E3 ubiquitin ligase, BRCA1, which ubiquitylates NSD on K292. Depletion of BRCA1 stabilized NSD2 protein and suppressed K562 cell differentiation. Furthermore, BRCA1 protein level was decreased in bone marrow tumor, while NSD2 level was elevated. Surprisingly, among BRCA1 mutation(s) discovered in lymphoma patients, BRCA1 K1183R prevented its translocation into the nucleus, failed to reduce NSD2 protein levels in hemin-treated K562 cells and eventually disrupted cell differentiation. Our results indicate the regulation of NSD2 stability by BRCA1-mediated ubiquitination as a potential therapeutic target process in multiple myeloma. Park et al. identify Multiple Myeloma SET domain (MMSET/NSD2) in a large-scale CRISPR screen of genes whose depletion regulates hematopoietic differentiation and found it to interact with BRCA1. Thus regulation of MMSET/NSD2 stability BRCA1-mediated ubiquitination could be explored for potential therapeutic interventions in multiple myeloma.
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Affiliation(s)
- Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Hyun Jeong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea.
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13
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Jung H, Seo SB. Histone lysine demethylase 3B (KDM3B) regulates the propagation of autophagy via transcriptional activation of autophagy-related genes. PLoS One 2020; 15:e0236403. [PMID: 32716961 PMCID: PMC7384621 DOI: 10.1371/journal.pone.0236403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 07/05/2020] [Indexed: 12/14/2022] Open
Abstract
Autophagy, a self-degradative physiological process, is critical for homeostasis maintenance and energy source balancing in response to various stresses, including nutrient deprivation. It is a highly conserved catabolic process in eukaryotes and is indispensable for cell survival as it involves degradation of unessential or excessive components and their subsequent recycling as building blocks for the synthesis of necessary molecules. Although the dysregulation of autophagy has been reported to broadly contribute to various diseases, including cancers and neurodegenerative diseases, the molecular mechanisms underlying the epigenetic regulation of autophagy are poorly elucidated. Here, we report that the level of lysine demethylase 3B (KDM3B) increases in nutrient-deprived HCT116 cells, a colorectal carcinoma cell line, resulting in transcriptional activation of the autophagy-inducing genes. KDM3B was found to enhance the transcription by demethylating H3K9me2 on the promoter of these genes. Furthermore, we observed that the depletion of KDM3B inhibited the autophagic flux in HCT116 cells. Collectively, these data suggested the critical role of KDM3B in the regulation of autophagy-related genes via H3K9me2 demethylation and induction of autophagy in nutrient-starved HCT116 cells.
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Affiliation(s)
- Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, Republic of Korea
- * E-mail:
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14
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Abstract
A recent study suggested that methylation of ubiquitin-like with PHD and RING finger domain 1 (UHRF1) is regulated by SET7 and lysine-specific histone demethylase 1A (LSD1) and is essential for homologous recombination (HR). The study demonstrated that SET7-mediated methylation of UHRF1 promotes polyubiquitination of proliferating cell nuclear antigen (PCNA), inducing HR. However, studies on mediators that interact with and recruit UHRF1 to damaged lesions are needed to elucidate the mechanism of UHRF1 methylation-induced HR. Here, we identified that poly [ADP-ribose] polymerase 1 (PARP1) interacts with damage-induced methylated UHRF1 specifically and mediates UHRF1 to induce HR progression. Furthermore, cooperation of UHRF1-PARP1 is essential for cell viability, suggesting the importance of the interaction of UHRF1-PARP1 for damage tolerance in response to damage. Our data revealed that PARP1 mediates the HR mechanism, which is regulated by UHRF1 methylation. The data also indicated the significant role of PARP1 as a mediator of UHRF1 methylation-correlated HR pathway.
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Affiliation(s)
- Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Korea
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15
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Chae YC, Jung H, Kim JY, Lee DH, Seo SB. Ubiquitin-specific peptidase 3 induces TPA-mediated leukemia cell differentiation via regulating H2AK119ub. Anim Cells Syst (Seoul) 2019; 23:311-317. [PMID: 31700696 PMCID: PMC6830191 DOI: 10.1080/19768354.2019.1661283] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 08/19/2019] [Accepted: 08/23/2019] [Indexed: 12/15/2022] Open
Abstract
Acute myeloid leukemia (AML) is the most common type of leukemia in adults. Owing to the chemotherapy associated side effects and toxicity, it is necessary to find a new mechanism, which can identify new potential therapeutic targets at the molecular level. Here, we identified new target genes that are induced during the TPA-induced HL-60 cell differentiation by ChIP-seq and microarray data analysis. Using q-PCR and ChIP assay, we confirmed that the target genes including USP3, USP35, TCF4, and SGK1 are upregulated during TPA-mediated HL-60 cell differentiation. Levels of USP3, one of the deubiquitinating enzymes (DUBs), increased by TPA treatment, resulting in the reduction of H2AK119ub levels. In addition, we revealed that depletion of USP3 inhibits TPA-mediated leukemia cell differentiation q-PCR and FACS analysis. Taken together, our data indicate that USP3 promotes TPA-mediated leukemia cell differentiation via regulating H2AK119ub levels.
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Affiliation(s)
- Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Dong Ho Lee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
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16
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Chae YC, Kim JY, Park JW, Kim KB, Oh H, Lee KH, Seo SB. FOXO1 degradation via G9a-mediated methylation promotes cell proliferation in colon cancer. Nucleic Acids Res 2019; 47:1692-1705. [PMID: 30535125 PMCID: PMC6393239 DOI: 10.1093/nar/gky1230] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 11/07/2018] [Accepted: 11/28/2018] [Indexed: 12/15/2022] Open
Abstract
Posttranslational modifications of the Forkhead family transcription factor, FOXO1, have been known to have important regulatory implications in its diverse activities. Several types of modifications of FOXO1, including acetylation, phosphorylation, and ubiquitination, have been reported. However, lysine methylation of FOXO1 has not yet been identified. Here, we reported that FOXO1 is methylated by G9a at K273 residue in vitro and in vivo. Methylation of FOXO1 by G9a increased interaction between FOXO1 and a specific E3 ligase, SKP2, and decreased FOXO1 protein stability. In addition, G9a expression was increased by insulin and resulted in insulin-mediated FOXO1 degradation by K273 methylation. Tissue array analysis indicated that G9a was overexpressed and FOXO1 levels decreased in human colon cancer. Cell proliferation assays revealed that G9a-mediated FOXO1 methylation increased colon cancer cell proliferation. Fluorescence-activated cell sorting (FACS) analysis indicated that apoptosis rates were higher in the presence of FOXO1 than in FOXO1 knock-out cells. Furthermore, we found that G9a protein levels were elevated and FOXO1 protein levels were decreased in human colon cancer patients tissue samples. Here, we report that G9a specific inhibitor, BIX-01294, can regulate cell proliferation and apoptosis by inhibiting G9a-mediated FOXO1 methylation.
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Affiliation(s)
- Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Hyein Oh
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Kyung-Hwa Lee
- Department of Pathology, Chonnam National University Hwasun Hospital and Medical School, Hwasun, Jeollanam-do, South Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
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17
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Hahm JY, Kim JY, Park JW, Kang JY, Kim KB, Kim SR, Cho H, Seo SB. Methylation of UHRF1 by SET7 is essential for DNA double-strand break repair. Nucleic Acids Res 2019; 47:184-196. [PMID: 30357346 PMCID: PMC6326791 DOI: 10.1093/nar/gky975] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 10/06/2018] [Indexed: 12/13/2022] Open
Abstract
Ubiquitin-like with PHD and RING finger domains 1 (UHRF1) is a key epigenetic regulator of DNA methylation maintenance and heterochromatin formation. The roles of UHRF1 in DNA damage repair also have been emphasized in recent years. However, the regulatory mechanism of UHRF1 remains elusive. In this study, we showed that UHRF1 is methylated by SET7 and demethylation is catalyzed by LSD1. In addition, methylation of UHRF1 is induced in response to DNA damage and its phosphorylation in S phase is a prerequisite for interaction with SET7. Furthermore, UHRF1 methylation catalyzes the conjugation of polyubiquitin chains to PCNA and promotes homologous recombination for DNA repair. SET7-mediated UHRF1 methylation is also shown to be essential for cell viability against DNA damage. Our data revealed the regulatory mechanism underlying the UHRF1 methylation status by SET7 and LSD1 in double-strand break repair pathway.
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Affiliation(s)
- Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Se-Ryeon Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hana Cho
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 06974, Republic of Korea
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18
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Affiliation(s)
- Hyun Kook
- From the Department of Pharmacology, Chonnam National University Medical School, Gwangju, South Korea (H.K.); Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea (S.-B.S.); and Departments of Medicine and Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia (R.J.).
| | - Sang-Beom Seo
- From the Department of Pharmacology, Chonnam National University Medical School, Gwangju, South Korea (H.K.); Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea (S.-B.S.); and Departments of Medicine and Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia (R.J.)
| | - Rajan Jain
- From the Department of Pharmacology, Chonnam National University Medical School, Gwangju, South Korea (H.K.); Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea (S.-B.S.); and Departments of Medicine and Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia (R.J.)
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19
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An MJ, Kim DH, Kim CH, Kim M, Rhee S, Seo SB, Kim JW. Histone demethylase KDM3B regulates the transcriptional network of cell-cycle genes in hepatocarcinoma HepG2 cells. Biochem Biophys Res Commun 2018; 508:576-582. [PMID: 30514438 DOI: 10.1016/j.bbrc.2018.11.179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 11/27/2018] [Indexed: 10/27/2022]
Abstract
Hepatocellular carcinoma (HCC) is the fifth most common cancer and the third most lethal cancer worldwide. Although gene mutations associated with HCC development have been intensively studied, how epigenetic factors specifically modulate the functional properties of HCC by regulating target gene expression is unclear. Here we demonstrated the overexpression of KDM3B in liver tissue of HCC patients using public RNA-seq data. Ablation of KDM3B by CRISPR/Cas9 retarded the cell cycle and proliferation of hepatocarcinoma HepG2 cells. Approximately 30% of KDM3B knockout cells exhibited mitotic spindle multipolarity as a chromosome instability (CIN) phenotype. RNA-seq analysis of KDM3B knockout revealed significantly down-regulated expression of cell cycle related genes, especially cell proliferation factor CDC123. Furthermore, the expression level of Cyclin D1 was reduced in KDM3B knockout by proteosomal degradation without any change in the expression of CCND1, which encodes Cyclin D1. The results implicate KDM3B as a crucial epigenetic factor in cell cycle regulation that manipulates chromatin dynamics and transcription in HCC, and identifies a potential gene therapy target for effective treatment of HCC.
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Affiliation(s)
- Mi-Jin An
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea
| | - Dae-Hyun Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea
| | - Chul-Hong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea
| | - Mijin Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea
| | - Sangmyung Rhee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea
| | - Jung-Woong Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, 06974, Seoul, Republic of Korea.
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20
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Jung H, Chae YC, Kim JY, Jeong OS, Kook H, Seo SB. Author Correction: Regulatory role of G9a and LSD1 in the Transcription of Olfactory Receptors during Leukaemia Cell Differentiation. Sci Rep 2018; 8:17075. [PMID: 30451935 PMCID: PMC6242810 DOI: 10.1038/s41598-018-35591-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Oh-Seok Jeong
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Hoon Kook
- Environmental Health Center for Childhood Leukaemia and Cancer, Department of Pediatrics, Chonnam National University Hwasun Hospital, Hwasun, 519-809, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, 156-756, Republic of Korea.
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21
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Park JW, Cho H, Oh H, Kim JY, Seo SB. AURKA Suppresses Leukemic THP-1 Cell Differentiation through Inhibition of the KDM6B Pathway. Mol Cells 2018; 41:444-453. [PMID: 29477140 PMCID: PMC5974621 DOI: 10.14348/molcells.2018.2311] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/19/2018] [Accepted: 02/10/2018] [Indexed: 12/24/2022] Open
Abstract
Aberrations in histone modifications are being studied in mixed-lineage leukemia (MLL)-AF9-driven acute myeloid leukemia (AML). In this study, we focused on the regulation of the differentiation of the MLL-AF9 type AML cell line THP-1. We observed that, upon phorbol 12-myristate 13-acetate (PMA) treatment, THP-1 cells differentiated into monocytes by down-regulating Aurora kinase A (AURKA), resulting in a reduction in H3S10 phosphorylation. We revealed that the AURKA inhibitor alisertib accelerates the expression of the H3K27 demethylase KDM6B, thereby dissociating AURKA and YY1 from the KDM6B promoter region. Using Flow cytometry, we found that alisertib induces THP-1 differentiation into monocytes. Furthermore, we found that treatment with the KDM6B inhibitor GSK-J4 perturbed the PMA-mediated differentiation of THP-1 cells. Thus, we discovered the mechanism of AURKA-KDM6B signaling that controls the differentiation of THP-1 cells, which has implications for biotherapy for leukemia.
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MESH Headings
- Aurora Kinase A/antagonists & inhibitors
- Aurora Kinase A/physiology
- Azepines/pharmacology
- Benzazepines/pharmacology
- Cell Differentiation/drug effects
- Chromatin Immunoprecipitation
- Cyclin-Dependent Kinase Inhibitor p21/metabolism
- Gene Expression Regulation, Leukemic
- Genes, Reporter
- HEK293 Cells
- Histones/metabolism
- Humans
- Jumonji Domain-Containing Histone Demethylases/antagonists & inhibitors
- Jumonji Domain-Containing Histone Demethylases/physiology
- Leukemia, Monocytic, Acute/genetics
- Leukemia, Monocytic, Acute/metabolism
- Leukemia, Monocytic, Acute/pathology
- Monocytes/cytology
- Myeloid-Lymphoid Leukemia Protein/physiology
- Neoplasm Proteins/antagonists & inhibitors
- Neoplasm Proteins/physiology
- Oncogene Proteins, Fusion/physiology
- Phosphorylation/drug effects
- Promoter Regions, Genetic
- Protein Processing, Post-Translational/drug effects
- Pyrimidines/pharmacology
- RNA Interference
- RNA, Small Interfering/genetics
- Recombinant Proteins/metabolism
- THP-1 Cells
- Tetradecanoylphorbol Acetate/pharmacology
- YY1 Transcription Factor/metabolism
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Affiliation(s)
- Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756,
Korea
| | - Hana Cho
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756,
Korea
| | - Hyein Oh
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756,
Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756,
Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756,
Korea
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22
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Kang JY, Kim JY, Kim KB, Park JW, Cho H, Hahm JY, Chae YC, Kim D, Kook H, Rhee S, Ha NC, Seo SB. KDM2B is a histone H3K79 demethylase and induces transcriptional repression via sirtuin-1-mediated chromatin silencing. FASEB J 2018; 32:5737-5750. [PMID: 29763382 DOI: 10.1096/fj.201800242r] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The methylation of histone H3 lysine 79 (H3K79) is an active chromatin marker and is prominent in actively transcribed regions of the genome; however, demethylase of H3K79 remains unknown despite intensive research. Here, we show that KDM2B, also known as FBXL10 and a member of the Jumonji C family of proteins known for its histone H3K36 demethylase activity, is a di- and trimethyl H3K79 demethylase. We demonstrate that KDM2B induces transcriptional repression of HOXA7 and MEIS1 via occupancy of promoters and demethylation of H3K79. Furthermore, genome-wide analysis suggests that H3K79 methylation levels increase when KDM2B is depleted, which indicates that KDM2B functions as an H3K79 demethylase in vivo. Finally, stable KDM2B-knockdown cell lines exhibit displacement of NAD+-dependent deacetylase sirtuin-1 (SIRT1) from chromatin, with concomitant increases in H3K79 methylation and H4K16 acetylation. Our findings identify KDM2B as an H3K79 demethylase and link its function to transcriptional repression via SIRT1-mediated chromatin silencing.-Kang, J.-Y., Kim, J.-Y., Kim, K.-B., Park, J. W., Cho, H., Hahm, J. Y., Chae, Y.-C., Kim, D., Kook, H., Rhee, S., Ha, N.-C., Seo, S.-B. KDM2B is a histone H3K79 demethylase and induces transcriptional repression via sirtuin-1-mediated chromatin silencing.
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Affiliation(s)
- Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Hana Cho
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Daehwan Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Hyun Kook
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University, Gwangju, South Korea.,Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea
| | - Sangmyeong Rhee
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
| | - Nam-Chul Ha
- Department of Food and Animal Biotechnology, Seoul National University, Seoul, South Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul, South Korea
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Jung H, Chae YC, Kim JY, Jeong OS, Kook H, Seo SB. Regulatory role of G9a and LSD1 in the Transcription of Olfactory Receptors during Leukaemia Cell Differentiation. Sci Rep 2017; 7:46182. [PMID: 28387360 PMCID: PMC5384044 DOI: 10.1038/srep46182] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 03/10/2017] [Indexed: 01/31/2023] Open
Abstract
Recent studies have reported the ectopic expression of olfactory receptors (ORs) in non-olfactory tissues, however, their physiological roles were not well elucidated. ORs are expressed in and function in different types of cancers. Here, we identified that the H3K9me2 levels of several OR promoters decreased during differentiation in the HL-60, human myeloid leukaemia cell line, by all-trans-retinoic acid (ATRA). We found that the differential OR promoters H3K9me2 levels were regulated by G9a and LSD1, resulting in the decrease of ORs transcription during HL-60 differentiation. G9a and LSD1 could regulate the expression of ORs in several non-olfactory cells via the methylation and demethylation of H3K9me2. In addition, we demonstrated that knockdown of OR significantly reduced cell proliferation. Therefore, the epigenetic regulation of ORs transcription is critical for carcinogenesis.
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Affiliation(s)
- Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Oh-Seok Jeong
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Hoon Kook
- Environmental Health Center for Childhood Leukaemia and Cancer, Department of Pediatrics, Chonnam National University Hwasun Hospital, Hwasun 519-809, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
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Pak JH, Son WC, Seo SB, Hong SJ, Sohn WM, Na BK, Kim TS. Peroxiredoxin 6 expression is inversely correlated with nuclear factor-κB activation during Clonorchis sinensis infestation. Free Radic Biol Med 2016; 99:273-285. [PMID: 27554973 DOI: 10.1016/j.freeradbiomed.2016.08.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Revised: 08/09/2016] [Accepted: 08/12/2016] [Indexed: 12/31/2022]
Abstract
Clonorchis sinensis is a carcinogenic human liver fluke. Its infection promotes persistent oxidative stress and chronic inflammation environments in the bile duct and surrounding liver tissues owing to direct contact with worms and their excretory-secretory products (ESPs), provoking epithelial hyperplasia, periductal fibrosis, and cholangiocarcinogenesis. We examined the reciprocal regulation of two ESP-induced redox-active proteins, NF-κB and peroxiredoxin 6 (Prdx6), during C. sinensis infection. Prdx6 overexpression suppressed intracellular free-radical generation by inhibiting NADPH oxidase2 and inducible nitric oxide synthase activation in the ESP-treated cholangiocarcinoma cells, substantially attenuating NF-κB-mediated inflammation. NF-κB overexpression decreased Prdx6 transcription levels by binding to two κB sites within the promoter. This transcriptional repression was compensated for by other ESP-induced redox-active transcription factors, including erythroid 2-related factor 2 (Nrf2), hypoxia inducible factor 1α (HIF1α), and CCAAT/enhancer-binding protein β (C/EBPβ). Distribution of immunoreactive Prdx6 and NF-κB was distinct in the early stages of infection in mouse livers but shared concomitant localization in the later stages. The intensity and extent of their immunoreactive staining in infected mouse livers are proportional to lesion severity and infection duration. The constitutive elevations of Prdx6 and NF-κB during C. sinensis infection may be associated with more severe persistent hepatobiliary abnormalities mediated by clonorchiasis.
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Affiliation(s)
- Jhang Ho Pak
- Department of Convergence Medicine University of Ulsan College of Medicine and Asan Institute for Life Sciences, Asan Medical Center, 388-1 Pungnap-2 dong, Songpa-gu, Seoul 138-736, Republic of Korea.
| | - Woo Chan Son
- Department of Pathology, University of Ulsan College of Medicine and Asan Institute for Life Sciences, Asan Medical Center, Seoul 138-736, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Sung-Jong Hong
- Department of Medical Environmental Biology and Research Center for Biomolecules and Biosystems, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Woon-Mok Sohn
- Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Republic of Korea
| | - Byoung-Kuk Na
- Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Republic of Korea
| | - Tong-Soo Kim
- Department of Parasitology, Inha University School of Medicine, Incheon 400-103, Republic of Korea
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Abstract
Here we report that the H3K9 demethylase KDM3B represses transcription of the angiogenesis regulatory gene, ANGPT1. Negative regulation of ANGPT1 by KDM3B is independent of its Jumonji (JmjC) domain-mediated H3K9 demethylase activity. We demonstrate that KDM3B downregulates ANGPT1 via interaction with SMRT, and suggest that the repressor complex is formed at the promoter area of ANGPT1. Using MTT and wound healing assays, depletion of KDM3B was found to increase cell proliferation and cell motility, indicating that KDM3B has a role in angiogenesis. [BMB Reports 2015; 48(7): 401-406]
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Affiliation(s)
- Arim Han
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
| | - Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
| | - Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
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Woo Park J, Kim KB, Kim JY, Chae YC, Jeong OS, Seo SB. RE-IIBP Methylates H3K79 and Induces MEIS1-mediated Apoptosis via H2BK120 Ubiquitination by RNF20. Sci Rep 2015. [PMID: 26206755 PMCID: PMC4513340 DOI: 10.1038/srep12485] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Histone lysine methylation contributes to transcriptional regulation by serving as a platform for the recruitment of various cofactors. Intense studies have been conducted for elucidating the functional meaning of H3K79 methylation, and to date, the only known HMTase responsible for the modification was DOT1L. In this study, we report that the MMSET isoform RE-IIBP has HMTase activity for H3K79. It was uncovered that RE-IIBP up-regulates MEIS1 transcription through H3K79 methylation via recruitment to the MEIS1 promoter. By means of proteomic and biochemical analysis, association of RE-IIBP with the E3 ubiquitin ligase RNF20 was demonstrated for synergistic activation of MEIS1 transcription via H3K79 HMTase activity. Furthermore, It was observed that RE-IIBP induces MEIS1-mediated apoptosis, which was dependent on H2BK120 ubiquitination by RNF20. These findings suggest RE-IIBP as another candidate for further studies to elucidate the mechanism of H3K79 methylation and its biological functions.
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Affiliation(s)
- Jin Woo Park
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Oh-Seok Jeong
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
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Kim KB, Son HJ, Choi S, Hahm JY, Jung H, Baek HJ, Kook H, Hahn Y, Kook H, Seo SB. H3K9 methyltransferase G9a negatively regulates UHRF1 transcription during leukemia cell differentiation. Nucleic Acids Res 2015; 43:3509-23. [PMID: 25765655 PMCID: PMC4402520 DOI: 10.1093/nar/gkv183] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 02/23/2015] [Indexed: 01/03/2023] Open
Abstract
Histone H3K9 methyltransferase (HMTase) G9a-mediated transcriptional repression is a major epigenetic silencing mechanism. UHRF1 (ubiquitin-like with PHD and ring finger domains 1) binds to hemimethylated DNA and plays an essential role in the maintenance of DNA methylation. Here, we provide evidence that UHRF1 is transcriptionally downregulated by H3K9 HMTase G9a. We found that increased expression of G9a along with transcription factor YY1 specifically represses UHRF1 transcription during TPA-mediated leukemia cell differentiation. Using ChIP analysis, we found that UHRF1 was among the transcriptionally silenced genes during leukemia cell differentiation. Using a DNA methylation profiling array, we discovered that the UHRF1 promoter was hypomethylated in samples from leukemia patients, further supporting its overexpression and oncogenic activity. Finally, we showed that G9a regulates UHRF1-mediated H3K23 ubiquitination and proper DNA replication maintenance. Therefore, we propose that H3K9 HMTase G9a is a specific epigenetic regulator of UHRF1.
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Affiliation(s)
- Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
| | - Hye-Ju Son
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
| | - Sulji Choi
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
| | - Ja Young Hahm
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
| | - Hyeonsoo Jung
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
| | - Hee Jo Baek
- Environmental Health Center for Childhood Leukemia and Cancer, Department of Pediatrics, Chonnam National University Hwasun Hospital, Hwasun 519-809
| | - Hoon Kook
- Environmental Health Center for Childhood Leukemia and Cancer, Department of Pediatrics, Chonnam National University Hwasun Hospital, Hwasun 519-809
| | - Yoonsoo Hahn
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
| | - Hyun Kook
- Medical Research Center for Gene Regulation and Department of Pharmacology, Chonnam National University, Gwangju 501-746, Republic of Korea
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756
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28
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Kim CH, Kim JW, Jang SM, An JH, Seo SB, Choi KH. The chromodomain-containing histone acetyltransferase TIP60 acts as a code reader, recognizing the epigenetic codes for initiating transcription. Biosci Biotechnol Biochem 2015; 79:532-8. [PMID: 25560918 DOI: 10.1080/09168451.2014.993914] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
TIP60 can act as a transcriptional activator or a repressor depending on the cellular context. However, little is known about the role of the chromodomain in the functional regulation of TIP60. In this study, we found that TIP60 interacted with H3K4me3 in response to TNF-α signaling. TIP60 bound to H3K4me3 at the promoters of the NF-κB target genes IL6 and IL8. Unlike the wild-type protein, a TIP60 chromodomain mutant did not localize to chromatin regions. Because TIP60 binds to histones with specific modifications and transcriptional regulators, we used a histone peptide assay to identify histone codes recognized by TIP60. TIP60 preferentially interacted with methylated or acetylated histone H3 and H4 peptides. Phosphorylation near a lysine residue significantly reduced the affinity of TIP60 for the modified histone peptides. Our findings suggest that TIP60 acts as a functional link between the histone code and transcriptional regulators.
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Affiliation(s)
- Chul-Hong Kim
- a Department of Life Science, College of Natural Sciences , Chung-Ang University , Seoul , Korea
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29
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Kim KB, Chae YC, Han A, Kang JY, Jung H, Park JW, Hahm JY, Kim S, Seo SB. Negative regulation of peroxiredoxin 6 (Prdx 6) transcription by nuclear oncoprotein DEK during leukemia cell differentiation. Anim Cells Syst (Seoul) 2014. [DOI: 10.1080/19768354.2014.950605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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30
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Chae YC, Kim KB, Kang JY, Kim SR, Jung HS, Seo SB. Inhibition of FoxO1 acetylation by INHAT subunit SET/TAF-Iβ induces p21 transcription. FEBS Lett 2014; 588:2867-73. [DOI: 10.1016/j.febslet.2014.06.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 05/18/2014] [Accepted: 06/06/2014] [Indexed: 10/25/2022]
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31
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Oh ST, Kim KB, Chae YC, Kang JY, Hahn Y, Seo SB. H3K9 histone methyltransferase G9a-mediated transcriptional activation of p21. FEBS Lett 2014; 588:685-91. [PMID: 24492005 DOI: 10.1016/j.febslet.2014.01.039] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/08/2014] [Accepted: 01/17/2014] [Indexed: 10/25/2022]
Abstract
We report that H3K9 HMTase G9a activates transcription of the cell cycle regulatory gene, p21, in p53-null H1299 cells. Positive regulation of p21 by G9a is independent of its HMTase activity. We demonstrate that G9a upregulates p21 via interaction with PCAF, and provide evidence that the activating complex is recruited to the p21 promoter upon DNA damage-inducing agent etoposide treatment. Our study suggests that G9a decreases proliferation and cell viability by increasing the level of p21-mediated apoptosis. Our results suggest that G9a functions as a coactivator for p21 transcription, and directs cells to undergo apoptosis.
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Affiliation(s)
- Si-Taek Oh
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Kee-Beom Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Yun-Cheol Chae
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Joo-Young Kang
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
| | - Yoonsoo Hahn
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea.
| | - Sang-Beom Seo
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea.
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32
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Kim KB, Kim DW, Park JW, Jeon YJ, Kim D, Rhee S, Chae JI, Seo SB. Inhibition of Ku70 acetylation by INHAT subunit SET/TAF-Iβ regulates Ku70-mediated DNA damage response. Cell Mol Life Sci 2013; 71:2731-45. [DOI: 10.1007/s00018-013-1525-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/28/2013] [Accepted: 11/14/2013] [Indexed: 11/30/2022]
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33
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Abstract
Oxidative stress triggered by amyloid beta (Aβ) accumulation contributes substantially to the pathogenesis of Alzheimer's disease (AD). In the present study, we examined the involvement of the antioxidant activity of peroxiredoxin 6 (Prdx 6) in protecting against Aβ25-35-induced neurotoxicity in rat PC12 cells. Treatment of PC12 cells with Aβ25-35 resulted in a dose- and time-dependent cytotoxicity that was associated with increased accumulation of intracellular reactive oxygen species (ROS) and mitochondria-mediated apoptotic cell death, including activation of Caspase 3 and 9, inactivation of poly ADP-ribosyl polymerse (PARP), and dysregulation of Bcl-2 and Bax. This apoptotic signaling machinery was markedly attenuated in PC12 cells that overexpress wild-type Prdx 6, but not in cells that overexpress the C47S catalytic mutant of Prdx 6. This indicates that the peroxidase activity of Prdx 6 protects PC12 cells from Aβ25-35-induced neurotoxicity. The neuroprotective role of the antioxidant Prdx 6 suggests its therapeutic and/or prophylactic potential to slow the progression of AD and limit the extent of neuronal cell death caused by AD.
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Affiliation(s)
- I K Kim
- Asan Institute for Life Sciences, University of Ulsan College of Medicine, Asan Medical Center , Seoul , Republic of Korea
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34
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Son HJ, Kim JY, Rhee S, Seo SB. Identification of histone methyltransferase RE-IIBP target genes in leukemia cell line. Anim Cells Syst (Seoul) 2012. [DOI: 10.1080/19768354.2011.644045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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35
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Kim JY, Kim KB, Son HJ, Chae YC, Oh ST, Kim DW, Pak JH, Seo SB. H3K27 methylation and H3S28 phosphorylation-dependent transcriptional regulation by INHAT subunit SET/TAF-Iβ. FEBS Lett 2012; 586:3159-65. [PMID: 22796192 DOI: 10.1016/j.febslet.2012.06.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 06/06/2012] [Accepted: 06/14/2012] [Indexed: 12/24/2022]
Abstract
Significant progress has been made in understanding the relationship between histone modifications and 'reader' molecules and their effects on transcriptional regulation. A previously identified INHAT complex subunit, SET/TAF-Iβ, binds to histones and inhibits histone acetylation. To investigate the binding specificities of SET/TAF-Iβ to various histone modifications, we employed modified histone tail peptide array analyses. SET/TAF-Iβ strongly recognized PRC2-mediated H3K27me1/2/3; however, the bindings were completely disrupted by H3S28 phosphorylation. We have demonstrated that SET/TAF-Iβ is sequentially recruited to the target gene promoter ATF3 after the PRC2 complex via H3K27me recognition and may offer additive effects in the repression of the target gene.
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Affiliation(s)
- Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Research Center for Biomolecules and Biosystems, Chung-Ang University, Seoul 156-756, Republic of Korea
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36
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Kim DW, Jeong S, Kim DS, Kim HS, Seo SB, Hahn Y. Inactivation of the MSLNL gene encoding mesothelin-like protein during African great ape evolution. Gene 2012; 496:17-21. [PMID: 22265842 DOI: 10.1016/j.gene.2012.01.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Revised: 12/22/2011] [Accepted: 01/05/2012] [Indexed: 10/14/2022]
Abstract
Loss of gene function is implicated in the emergence of novel phenotypes during organism evolution. Here, we report the inactivation of the MSLNL gene encoding mesothelin-like protein in African great ape evolution. Human MSLNL has a nonsense mutation in exon 10 and two polymorphic mutations: a frameshift in exon 3 and a nonsense codon in exon 8. The gorilla gene also shows multiple deleterious mutations, including a premature stop codon, a deletion, and a splice site mutation. Molecular evolutionary analysis indicated relaxed selection pressure on MSLNL in African great ape lineages, which suggested that MSLNL might have become inactivated before the divergence of human, chimpanzee and gorilla. The mouse Mslnl gene is highly expressed in olfactory epithelium and moderately expressed in several other tissues. We propose that the loss of MSLNL may be associated with the evolution of the olfactory system in African great apes including human.
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Affiliation(s)
- Dong-Wook Kim
- School of Biological Sciences (BK21 Program), College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
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Abstract
The tumor suppressor p53 responds to a wide variety of cellular stress signals. Among potential regulatory pathways, post-translational modifications such as acetylation by CBP/p300 and PCAF have been suggested for modulation of p53 activity. However, exactly how p53 acetylation is modulated remains poorly understood. Here, we found that SET/TAF-Iβ inhibited p300- and PCAF-mediated p53 acetylation in an INHAT (inhibitor of histone acetyltransferase) domain-dependent manner. SET/TAF-Iβ interacted with p53 and repressed transcription of p53 target genes. Consequently, SET/TAF-Iβ blocked both p53-mediated cell cycle arrest and apoptosis in response to cellular stress. Using different apoptosis analyses, including FACS, TUNEL and BrdU incorporation assays, we also found that SET/TAF-Iβ induced cellular proliferation via inhibition of p53 acetylation. Furthermore, we observed that apoptotic Drosophila eye phenotype induced by either dp53 overexpression or UV irradiation was rescued by expression of dSet. Inhibition of dp53 acetylation by dSet was observed in both cases. Our findings provide new insights into the regulation of stress-induced p53 activation by HAT-inhibiting histone chaperone SET/TAF-Iβ.
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Affiliation(s)
- Ji-Young Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
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38
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Eom GH, Kim KB, Kim JH, Kim JY, Kim JR, Kee HJ, Kim DW, Choe N, Park HJ, Son HJ, Choi SY, Kook H, Seo SB. Histone methyltransferase SETD3 regulates muscle differentiation. J Biol Chem 2011; 286:34733-42. [PMID: 21832073 DOI: 10.1074/jbc.m110.203307] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Histone lysine methylation, as one of the most important factors in transcriptional regulation, is associated with a various physiological conditions. Using a bioinformatics search, we identified and subsequently cloned mouse SET domain containing 3 (SETD3) with SET (Su(var)3-9, Enhancer-of-zeste and Trithorax) and Rubis-subs-bind domains. SETD3 is a novel histone H3K4 and H3K36 methyltransferase with transcriptional activation activity. SETD3 is expressed abundantly in muscular tissues and, when overexpressed, activates transcription of muscle-related genes, myogenin, muscle creatine kinase (MCK), and myogenic factor 6 (Myf6), thereby inducing muscle cell differentiation. Conversely, knockdown of SETD3 by shRNA significantly retards muscle cell differentiation. In this study, SETD3 was recruited to the myogenin gene promoter along with MyoD where it activated transcription. Together, these data indicate that SETD3 is a H3K4/K36 methyltransferase and plays an important role in the transcriptional regulation of muscle cell differentiation.
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Affiliation(s)
- Gwang Hyeon Eom
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Republic of Korea
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39
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Kee HJ, Kim JR, Joung H, Choe N, Lee SE, Eom GH, Kim JC, Geyer SH, Jijiwa M, Kato T, Kawai K, Weninger WJ, Seo SB, Nam KI, Jeong MH, Takahashi M, Kook H. Ret finger protein inhibits muscle differentiation by modulating serum response factor and enhancer of polycomb1. Cell Death Differ 2011; 19:121-31. [PMID: 21637294 DOI: 10.1038/cdd.2011.72] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Skeletal myogenesis is precisely regulated by multiple transcription factors. Previously, we demonstrated that enhancer of polycomb 1 (Epc1) induces skeletal muscle differentiation by potentiating serum response factor (SRF)-dependent muscle gene activation. Here, we report that an interacting partner of Epc1, ret finger protein (RFP), blocks skeletal muscle differentiation. Our findings show that RFP was highly expressed in skeletal muscles and was downregulated during myoblast differentiation. Forced expression of RFP delayed myoblast differentiation, whereas knockdown enhanced it. Epc1-induced enhancements of SRF-dependent multinucleation, transactivation of the skeletal α-actin promoter, binding of SRF to the serum response element, and muscle-specific gene induction were blocked by RFP. RFP interfered with the physical interaction between Epc1 and SRF. Muscles from rfp knockout mice (Rfp(-/-)) mice were bigger than those from wild-type mice, and the expression of SRF-dependent muscle-specific genes was upregulated. Myotube formation and myoblast differentiation were enhanced in Rfp(-/-) mice. Taken together, our findings highlight RFP as a novel regulator of muscle differentiation that acts by modulating the expression of SRF-dependent skeletal muscle-specific genes.
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Affiliation(s)
- H J Kee
- Department of Pharmacology and Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju, South Korea
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40
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Choi S, Kim JY, Moon JD, Baek HJ, Kook H, Seo SB. Differential gene expression analysis in k562 human leukemia cell line treated with benzene. Toxicol Res 2011; 27:43-8. [PMID: 24278550 PMCID: PMC3834516 DOI: 10.5487/tr.2011.27.1.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 02/05/2011] [Accepted: 02/10/2011] [Indexed: 11/20/2022] Open
Abstract
Even though exposure to benzene has been linked to a variety of cancers including leukemia, the detailed molecular mechanisms relevant to benzene-induced carcinogenesis remain to be clearly elucidated. In this study, we evaluated the effects of benzene on differential gene expression in a leukemia cell line. The K562 leukemia cell line used in this study was cultured for 3 h with 10 mM benzene and RNA was extracted. To analyze the gene expression profiles, a 41,000 human whole genome chip was employed for cDNA microarray analysis. We initially identified 6,562 genes whose expression was altered by benzene treatment. Among these, 3,395 genes were upregulated and 3,167 genes were downregulated by more than 2-fold, respectively. The results of functional classification showed that the identified genes were involved in biological pathways including transcription, cell proliferation, the cell cycle, and apoptosis. These gene expression profiles should provide us with further insights into the molecular mechanisms underlying benzene-induced carcinogenesis, including leukemia.
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Affiliation(s)
- Sulji Choi
- Department of Life Science, College of Natural Science, Chung-Ang University, Seoul 156-756
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Jun JH, Yoon WJ, Seo SB, Woo KM, Kim GS, Ryoo HM, Baek JH. BMP2-activated Erk/MAP kinase stabilizes Runx2 by increasing p300 levels and histone acetyltransferase activity. J Biol Chem 2010; 285:36410-9. [PMID: 20851880 DOI: 10.1074/jbc.m110.142307] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Runx2 is a critical transcription factor for osteoblast differentiation. Regulation of Runx2 expression levels and transcriptional activity is important for bone morphogenetic protein (BMP)-induced osteoblast differentiation. Previous studies have shown that extracellular signal-regulated kinase (Erk) activation enhances the transcriptional activity of Runx2 and that BMP-induced Runx2 acetylation increases Runx2 stability and transcriptional activity. Because BMP signaling induces Erk activation in osteoblasts, we sought to investigate whether BMP-induced Erk signaling regulates Runx2 acetylation and stability. Erk activation by overexpression of constitutively active MEK1 increased Runx2 transcriptional activity, whereas U0126, an inhibitor of MEK1/2, suppressed basal Runx2 transcriptional activity and BMP-induced Runx2 acetylation and stabilization. Overexpression of constitutively active MEK1 stabilized Runx2 protein via up-regulation of acetylation and down-regulation of ubiquitination. Erk activation increased p300 protein levels and histone acetyltransferase activity. Knockdown of p300 using siRNA diminished Erk-induced Runx2 stabilization. Overexpression of Smad5 increased Runx2 acetylation and stabilization. Erk activation further increased Smad-induced Runx2 acetylation and stabilization, whereas U0126 suppressed these functions. On the other hand, knockdown of Smad1 and Smad5 by siRNA suppressed both basal and Erk-induced Runx2 protein levels. Erk activation enhanced the association of Runx2 with p300 and Smad1. Taken together these results indicate that Erk signaling increases Runx2 stability and transcriptional activity, partly via increasing p300 protein levels and histone acetyltransferase activity and subsequently increasing Runx2 acetylation by p300. In addition to the canonical Smad pathway, a BMP-induced non-Smad Erk signaling pathway cooperatively regulates osteoblast differentiation partly via increasing the stability and transcriptional activity of Runx2.
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Affiliation(s)
- Ji Hae Jun
- Department of Molecular Genetics, School of Dentistry and Dental Research Institute, BK21 Program, Seoul National University, Seoul 110-749, Republic of Korea
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Kim DW, Kim KB, Kim JY, Lee KS, Seo SB. Negative regulation of neuronal cell differentiation by INHAT subunit SET/TAF-Iβ. Biochem Biophys Res Commun 2010; 400:419-25. [DOI: 10.1016/j.bbrc.2010.08.093] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 08/19/2010] [Indexed: 10/19/2022]
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Lee JS, Kim Y, Kim IS, Kim B, Choi HJ, Lee JM, Shin HJR, Kim JH, Kim JY, Seo SB, Lee H, Binda O, Gozani O, Semenza GL, Kim M, Kim KI, Hwang D, Baek SH. Negative regulation of hypoxic responses via induced Reptin methylation. Mol Cell 2010; 39:71-85. [PMID: 20603076 DOI: 10.1016/j.molcel.2010.06.008] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 02/11/2010] [Accepted: 04/16/2010] [Indexed: 10/19/2022]
Abstract
Lysine methylation within histones is crucial for transcriptional regulation and thus links chromatin states to biological outcomes. Although recent studies have extended lysine methylation to nonhistone proteins, underlying molecular mechanisms such as the upstream signaling cascade that induces lysine methylation and downstream target genes modulated by this modification have not been elucidated. Here, we show that Reptin, a chromatin-remodeling factor, is methylated at lysine 67 in hypoxic conditions by the methyltransferase G9a. Methylated Reptin binds to the promoters of a subset of hypoxia-responsive genes and negatively regulates transcription of these genes to modulate cellular responses to hypoxia.
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Affiliation(s)
- Jason S Lee
- Department of Biological Sciences, Seoul National University, Seoul 151-742, South Korea
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Kim DW, Kim JY, Choi S, Rhee S, Hahn Y, Seo SB. Transcriptional regulation of 1-cys peroxiredoxin by the proto-oncogene protein DEK. Mol Med Rep 2010; 3:877-81. [PMID: 21472329 DOI: 10.3892/mmr.2010.346] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 07/26/2010] [Indexed: 11/05/2022] Open
Abstract
The nuclear phosphoprotein DEK is abundantly present in cells and is implicated in diseases including leukemia and autoimmune disorders. DEK has three highly acidic amino acid domains and inhibits histone acetyltransferase activity by binding directly to histones. In a previous study, differentially regulated proteins under DEK knockdown conditions, including the up-regulated protein 1-cys peroxiredoxin (1-cys Prx), were identified by proteome analysis. Here, an in vivo reporter assay with short hairpin RNA-mediated DEK knockdown revealed that DEK negatively regulated 1-cys Prx transcription, and that the NF-κB subunit p65 had a synergistic effect on this DEK-mediated repression. Both proteins are recruited to the 1-cys Prx promoter region and regulate its transcription. Our study demonstrates that DEK modulates the transcriptional regulation of the target gene through protein interaction with other regulatory proteins.
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Affiliation(s)
- Dong-Wook Kim
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 463-836, Korea
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Kim SM, Kim JY, Choe NW, Cho IH, Kim JR, Kim DW, Seol JE, Lee SE, Kook H, Nam KI, Kook H, Bhak YY, Seo SB. Regulation of mouse steroidogenesis by WHISTLE and JMJD1C through histone methylation balance. Nucleic Acids Res 2010; 38:6389-403. [PMID: 20530532 PMCID: PMC2965226 DOI: 10.1093/nar/gkq491] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The dynamic exchange of histone lysine methylation status by histone methyltransferases and demethylases has been previously implicated as an important factor in chromatin structure and transcriptional regulation. Using immunoaffinity TAP analysis, we purified the WHISTLE-interacting protein complexes, which include the heat shock protein HSP90α and the jumonji C-domain harboring the histone demethylase JMJD1C. In this study, we demonstrate that JMJD1C specifically demethylates histone H3K9 mono- and di-methylation, and mediates transcriptional activation. We also provide evidence suggesting that both WHISTLE and JMJD1C performs functions in the development of mouse testes by regulating the expression of the steroidogenesis marker, p450c17, via SF-1-mediated transcription. Furthermore, we demonstrate that WHISTLE is recruited to the p450c17 promoter via SF-1 and represses the transcription of prepubertal stages of steroidogenesis, after which JMJD1C replaces WHISTLE and activates the expression of target genes via SF-1-mediated interactions. Our results demonstrate that the histone methylation balance mediated by HMTase WHISTLE and demethylase JMJD1C perform a transcriptional regulatory function in mouse testis development.
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Affiliation(s)
- Sung-Mi Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, Korea
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Kim DW, Kim JY, Moon JH, Kim KB, Kim TS, Hong SJ, Cheon YP, Pak JH, Seo SB. Transcriptional induction of minichromosome maintenance protein 7 (Mcm7) in human cholangiocarcinoma cells treated with Clonorchis sinensis excretory-secretory products. Mol Biochem Parasitol 2010; 173:10-6. [PMID: 20236609 DOI: 10.1016/j.molbiopara.2010.03.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Revised: 03/07/2010] [Accepted: 03/08/2010] [Indexed: 11/16/2022]
Abstract
Clonorchiasis is an infection associated with bile duct malignancy and subsequent development of cholangiocarcinoma. This disease is mainly caused by Clonorchis sinensis worms and their excretory-secretory products (ESP). However, the precise molecular mechanisms of carcinogenesis remain to be determined. Previously, we established differential gene expression profiles from microarrays containing 23,920 human genes of known function in a human cholangiocarcinoma cell line, HuCCT1, treated with ESP. Among the upregulated genes, we focused on minichromosome maintenance protein 7 (Mcm7), which is implicated in various cancer types, and analyzed transcriptional regulation mediated by ESP to further elucidate its role in cholangiocarcinoma development. Global histone acetylation levels were increased in ESP-treated cells, along with histone acetyltransferase (HAT) protein expression. Detailed promoter analysis using reporter and chromatin immunoprecipitation assays revealed that transcriptional activation of Mcm7 is mediated by HAT recruitment to the promoter region upon C. sinensis ESP treatment. These findings contribute to clarification of the intrinsic mechanism underlying the cellular carcinogenesis process stimulated by Mcm7 in C. sinensis-treated host cells.
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Affiliation(s)
- Dong-Wook Kim
- Research Center for Biomolecules and Biosystems, Department of Life Science, Chung-Ang University, Seoul, South Korea
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Lee JM, Kim IS, Kim H, Lee JS, Kim K, Yim HY, Jeong J, Kim JH, Kim JY, Lee H, Seo SB, Kim H, Rosenfeld MG, Kim KI, Baek SH. RORalpha attenuates Wnt/beta-catenin signaling by PKCalpha-dependent phosphorylation in colon cancer. Mol Cell 2010; 37:183-95. [PMID: 20122401 DOI: 10.1016/j.molcel.2009.12.022] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2009] [Revised: 08/14/2009] [Accepted: 10/28/2009] [Indexed: 11/19/2022]
Abstract
Wnt family members play diverse roles in development and disease. Noncanonical Wnt ligands can inhibit canonical Wnt signaling depending on the cellular context; however, the underlying mechanism of this antagonism remains poorly understood. Here we identify a specific mechanism of orphan nuclear receptor RORalpha-mediated inhibition of canonical Wnt signaling in colon cancer. Wnt5a/PKCalpha-dependent phosphorylation on serine residue 35 of RORalpha is crucial to link RORalpha to Wnt/beta-catenin signaling, which exerts inhibitory function of the expression of Wnt/beta-catenin target genes. Intriguingly, there is a significant correlation of reduction of RORalpha phosphorylation in colorectal tumor cases compared to their normal counterpart, providing the clinical relevance of the findings. Our data provide evidence for a role of RORalpha, functioning at the crossroads between the canonical and the noncanonical Wnt signaling pathways, in mediating transrepression of the Wnt/beta-catenin target genes, thereby providing new approaches for the development of therapeutic agents for human cancers.
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Affiliation(s)
- Ji Min Lee
- Department of Biological Sciences, Creative Research Initiative Center for Chromatin Dynamics, Seoul National University, Seoul 151-742, South Korea
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Pak JH, Moon JH, Hwang SJ, Cho SH, Seo SB, Kim TS. Proteomic analysis of differentially expressed proteins in human cholangiocarcinoma cells treated withClonorchis sinensisexcretoryâsecretory products. J Cell Biochem 2009; 108:1376-88. [DOI: 10.1002/jcb.22368] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Kim DW, Chae JI, Kim JY, Pak JH, Koo DB, Bahk YY, Seo SB. Proteomic analysis of apoptosis related proteins regulated by proto-oncogene protein DEK. J Cell Biochem 2009; 106:1048-59. [PMID: 19229864 DOI: 10.1002/jcb.22083] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A nuclear phosphoprotein, DEK, is implicated in certain human diseases, such as leukemia and antoimmune disorders, and a major component of metazoan chromatin. Basically as a modulator of chromatin structure, it can involve in various DNA and RNA-dependent processes and function as either an activator or repressor. Despite of numerous efforts to suggest the biological role of DEK, direct target proteins of DEK in different physiological status remains elusive. To investigate if DEK protein triggers the changes in certain protein networks, DEK was knocked down at both types of cell clones using siRNA expression. Here we provide a catalogue of proteome profiles in total cell lysates derived from normal HeLa and DEK knock-down HeLa cells and a good in vitro model system for dissecting the protein networks due to this proto-oncogenic DEK protein. In this biological context, we compared total proteome changes by the combined methods of two-dimensional gel electrophoresis, quantitative image analysis and MALDI-TOF MS analysis. There were a large number of targets for DEK, which were differentially expressed in DEK knock-down cells and consisted of 58 proteins (41 up-regulated and 17 down-regulated) differentially regulated expression was further confirmed for some subsets of candidates by Western blot analysis using specific antibodies. In the identified 58 spots, 16% of proteins are known to be associated with apoptosis. Among others, we identified apoptosis related proteins such as Annexins, Enolase1, Lamin A, and Glutathione-S-transferase omega 1. These results are consistent with recent studies indicating the crucial role of DEK in apoptosis pathway. We further demonstrated by ChIP analysis that knock-down of DEK caused hyperacetylation of histones around Prx VI promoter which is upregulated in our profile. Using immunoblotting analysis, we have demonstrated the modulation of other caspase-dependent apoptosis related proteins by DEK knock-down and further implicate its role in apoptosis pathway.
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Affiliation(s)
- Dong-Wook Kim
- Department of Life Science, College of Natural Sciences, Chung-Ang University, Seoul 156-756, South Korea
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Kim JY, Seo SB. Identification of Regulatory Role of KRAB Zinc Finger Protein ZNF 350 and Enolase-1 in RE-IIBP Mediated Transcriptional Repression. Biomol Ther (Seoul) 2009. [DOI: 10.4062/biomolther.2009.17.1.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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