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Havas AP, Tula-Sanchez AA, Steenhoek HM, Bhakta A, Wingfield T, Huntley MJ, Nofal AS, Ahmed T, Jaime-Frias R, Smith CL. Defining cellular responses to HDAC-selective inhibitors reveals that efficient targeting of HDAC3 is required to elicit cytotoxicity and overcome naïve resistance to pan-HDACi in diffuse large B cell lymphoma. Transl Oncol 2024; 39:101779. [PMID: 37865047 PMCID: PMC10597794 DOI: 10.1016/j.tranon.2023.101779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 07/12/2023] [Accepted: 08/30/2023] [Indexed: 10/23/2023] Open
Abstract
Approved histone deacetylase (HDAC) inhibitors have low efficacy against the most commonly-diagnosed non-Hodgkin lymphoma, diffuse large B cell lymphoma (DLBCL), but the mechanisms underlying clinical resistance are poorly understood. Using a DLBCL cell-based model, we previously demonstrated that resistance to pan-HDAC inhibitors (HDACi) is characterized by reversible growth arrest and sensitivity by mitotic arrest and apoptosis. The goal of the current study is to better define mechanisms of sensitivity and resistance to the cytotoxic effects of HDACi by using HDAC-selective inhibitors to determine which HDACs need to be targeted to achieve the sensitive and resistant phenotypes. We find that an inhibitor selective for HDACs 1 and 2 induces G1 arrest across DLBCL cell lines used, which is consistent with the resistant phenotype. In contrast an HDAC3-selective inhibitor induces DNA damage and cytotoxicity in a cell line that is sensitive to pan-HDACi but has no effect on resistant cell lines. RNAi-mediated depletion of HDAC3 indicate the presence of a long-lived population of HDAC3 in DLBCL cell lines. Finally, doses of pan-HDACi 3-5 times higher than the IC50 established for reversible growth inhibition induce the sensitive phenotype in resistant cell lines, suggesting that resistance may be associated with failure to efficiently inhibit HDAC3. Our findings indicate that selective inhibition of HDACs 1 and 2 is associated with G1 arrest and resistance to pan-HDACi while efficient targeting of HDAC3 could be key to achieving a cytotoxic response. Thus, our work reveals a potential novel mechanism of resistance to pan-HDACi.
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Affiliation(s)
- Aaron P Havas
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Ana A Tula-Sanchez
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Hailey M Steenhoek
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Anvi Bhakta
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Taylor Wingfield
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Matthew J Huntley
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Angela S Nofal
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Tasmia Ahmed
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Rosa Jaime-Frias
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA
| | - Catharine L Smith
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ 85721-0207, USA.
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Singh P, Bhadada SK, Arya AK, Saikia UN, Sachdeva N, Dahiya D, Kaur J, Brandi ML, Rao SD. Aberrant Epigenetic Alteration of PAX1 Expression Contributes to Parathyroid Tumorigenesis. J Clin Endocrinol Metab 2022; 107:e783-e792. [PMID: 34453169 PMCID: PMC8764231 DOI: 10.1210/clinem/dgab626] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Indexed: 12/22/2022]
Abstract
CONTEXT Primary hyperparathyroidism (PHPT) results from the hypersecretion of parathyroid hormone from parathyroid tumors. A transcription factor, namely Paired box1 (PAX1), is active in parathyroid gland development. OBJECTIVE We aimed to study potential epigenetic-mediated mechanism of PAX1 gene in sporadic parathyroid adenomas. METHODS In parathyroid adenomas tissues, we analyzed the DNA methylation via bisulfite-specific polymerase chain reaction (BSP) and histone modifications via chromatin immunoprecipitation in regulating the differential expression of PAX1. RESULTS The results showed that mRNA and protein expression of PAX1 was significantly reduced in parathyroid adenomas. Bisulfite sequencing demonstrated hypermethylation in the promoter region of PAX1 (35%; 14/40) and lower levels of histone 3 lysine 9 acetylation (H3K9ac) were observed on the promoter region of PAX1 (6-fold; P < .004) in parathyroid adenomas. Furthermore, upon treatment with a pharmacologic inhibitor, namely 5'aza-2 deoxycytidine, in rat parathyroid continuous cells, we found re-expression of PAX1 gene. CONCLUSION Our study not only reveals expression of PAX1 is epigenetically deregulated but also paves a way for clinical and therapeutic implications in patients with PHPT.
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Affiliation(s)
- Priyanka Singh
- Department of Endocrinology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Sanjay Kumar Bhadada
- Department of Endocrinology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
- Correspondence: Dr. Sanjay Kumar Bhadada, Post Graduate Institute of Medical Education and Research, Chandigarh, India, 160012.
| | - Ashutosh Kumar Arya
- Department of Endocrinology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Uma Nahar Saikia
- Department of Histopathology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Naresh Sachdeva
- Department of Endocrinology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Divya Dahiya
- Department of General Surgery, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Jyotdeep Kaur
- Department of Biochemistry, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Maria Luisa Brandi
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence 50121, Italy
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Smestad J, Erber L, Chen Y, Maher LJ. Chromatin Succinylation Correlates with Active Gene Expression and Is Perturbed by Defective TCA Cycle Metabolism. iScience 2018; 2:63-75. [PMID: 29888767 PMCID: PMC5993049 DOI: 10.1016/j.isci.2018.03.012] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Succinylation is a post-translational protein acylation modification that converts the cationic lysine side chain to an anion with large potential impacts on protein structure and function. Here we characterize the epigenome-wide distribution of succinyllysine marks in chromatin using chromatin immunoprecipitation sequencing (ChIP-seq). We estimate that more than one-third of all nucleosomes contain lysine succinylation marks and demonstrate a potential role of chromatin succinylation in modulating gene expression. We further demonstrate that defective tricarboxylic acid (TCA) cycle metabolism perturbs the succinyllysine distribution in chromatin, correlating with transcriptional responses. This is consistent with previous observations linking nucleosome succinylation with enhanced in vitro transcription. We additionally demonstrate that defective TCA cycle metabolism results in a DNA repair defect and sensitivity to genotoxic agents, consistent with previously reported chromatin hypersuccinylation effects observed in the context of SIRT7 depletion. Chromatin succinylation may thus represent a mechanism by which metabolism modulates both genome-wide transcription and DNA repair activities. SDH loss TCA cycle defect results in succinyl-CoA increase and hypersuccinylation Succinyllysine modification of chromatin correlates with active gene expression Chromatin succinyllysine change in SDH loss correlates with transcriptional change
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Affiliation(s)
- John Smestad
- Mayo Clinic Medical Scientist Training Program, Mayo Clinic College of Medicine and Science, 200 1(st) St SW, Rochester, MN 55905, USA; Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, 200 1(st) St SW, Rochester, MN 55905, USA
| | - Luke Erber
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - Yue Chen
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota at Twin Cities, Minneapolis, MN 55455, USA
| | - L James Maher
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, 200 1(st) St SW, Rochester, MN 55905, USA.
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HDAC Inhibitor-Induced Mitotic Arrest Is Mediated by Eg5/KIF11 Acetylation. Cell Chem Biol 2017; 24:481-492.e5. [PMID: 28392145 DOI: 10.1016/j.chembiol.2017.03.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 11/08/2016] [Accepted: 03/10/2017] [Indexed: 11/24/2022]
Abstract
Histone deacetylase 1 (HDAC1) is an epigenetic enzyme that regulates key cellular processes, such as cell proliferation, apoptosis, and cell survival, by deacetylating histone substrates. Aberrant expression of HDAC1 is implicated in multiple diseases, including cancer. As a consequence, HDAC inhibitors have emerged as effective anti-cancer drugs. HDAC inhibitor-induced G0/G1 cell-cycle arrest has been attributed to epigenetic transcriptional changes mediated by histone acetylation. However, the mechanism of G2/M arrest remains poorly understood. Here, we identified mitosis-related protein Eg5 (KIF11) as an HDAC1 substrate using a trapping mutant strategy. HDAC1 colocalized with Eg5 during mitosis and influenced the ATPase activity of Eg5. Importantly, an HDAC1- and HDAC2-selective inhibitor caused mitotic arrest and monopolar spindle formation, consistent with a model in which Eg5 deacetylation by HDAC1 is critical for mitotic progression. These findings revealed a previously unknown mechanism of action of HDAC inhibitors involving Eg5 acetylation, and provide a compelling mechanistic hypothesis for HDAC inhibitor-mediated G2/M arrest.
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Stengel KR, Hiebert SW. Class I HDACs Affect DNA Replication, Repair, and Chromatin Structure: Implications for Cancer Therapy. Antioxid Redox Signal 2015; 23:51-65. [PMID: 24730655 PMCID: PMC4492608 DOI: 10.1089/ars.2014.5915] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
SIGNIFICANCE The contribution of epigenetic alterations to cancer development and progression is becoming increasingly clear, prompting the development of epigenetic therapies. Histone deacetylase inhibitors (HDIs) represent one of the first classes of such therapy. Two HDIs, Vorinostat and Romidepsin, are broad-spectrum inhibitors that target multiple histone deacetylases (HDACs) and are FDA approved for the treatment of cutaneous T-cell lymphoma. However, the mechanism of action and the basis for the cancer-selective effects of these inhibitors are still unclear. RECENT ADVANCES While the anti-tumor effects of HDIs have traditionally been attributed to their ability to modify gene expression after the accumulation of histone acetylation, recent studies have identified the effects of HDACs on DNA replication, DNA repair, and genome stability. In addition, the HDIs available in the clinic target multiple HDACs, making it difficult to assign either their anti-tumor effects or their associated toxicities to the inhibition of a single protein. However, recent studies in mouse models provide insights into the tissue-specific functions of individual HDACs and their involvement in mediating the effects of HDI therapy. CRITICAL ISSUES Here, we describe how altered replication contributes to the efficacy of HDAC-targeted therapies as well as discuss what knowledge mouse models have provided to our understanding of the specific functions of class I HDACs, their potential involvement in tumorigenesis, and how their disruption may contribute to toxicities associated with HDI treatment. FUTURE DIRECTIONS Impairment of DNA replication by HDIs has important therapeutic implications. Future studies should assess how best to exploit these findings for therapeutic gain.
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Affiliation(s)
- Kristy R. Stengel
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Scott W. Hiebert
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee
- Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee
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6
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Jarome TJ, Lubin FD. Epigenetic mechanisms of memory formation and reconsolidation. Neurobiol Learn Mem 2014; 115:116-27. [PMID: 25130533 PMCID: PMC4250295 DOI: 10.1016/j.nlm.2014.08.002] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 08/02/2014] [Accepted: 08/05/2014] [Indexed: 10/24/2022]
Abstract
Memory consolidation involves transcriptional control of genes in neurons to stabilize a newly formed memory. Following retrieval, a once consolidated memory destabilizes and again requires gene transcription changes in order to restabilize, a process referred to as reconsolidation. Understanding the molecular mechanisms of gene transcription during the consolidation and reconsolidation processes could provide crucial insights into normal memory formation and memory dysfunction associated with psychiatric disorders. In the past decade, modifications of epigenetic markers such as DNA methylation and posttranslational modifications of histone proteins have emerged as critical transcriptional regulators of gene expression during initial memory formation and after retrieval. In light of the rapidly growing literature in this exciting area of research, we here examine the most recent and latest evidence demonstrating how memory acquisition and retrieval trigger epigenetic changes during the consolidation and reconsolidation phases to impact behavior. In particular we focus on the reconsolidation process, where we discuss the already identified epigenetic regulators of gene transcription during memory reconsolidation, while exploring other potential epigenetic modifications that may also be involved, and expand on how these epigenetic modifications may be precisely and temporally controlled by important signaling cascades critical to the reconsolidation process. Finally, we explore the possibility that epigenetic mechanisms may serve to regulate a system or circuit level reconsolidation process and may be involved in retrieval-dependent memory updating. Hence, we propose that epigenetic mechanisms coordinate changes in neuronal gene transcription, not only during the initial memory consolidation phase, but are triggered by retrieval to regulate molecular and cellular processes during memory reconsolidation.
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Affiliation(s)
- Timothy J Jarome
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Farah D Lubin
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, United States.
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7
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Methot JL, Hoffman DM, Witter DJ, Stanton MG, Harrington P, Hamblett C, Siliphaivanh P, Wilson K, Hubbs J, Heidebrecht R, Kral AM, Ozerova N, Fleming JC, Wang H, Szewczak AA, Middleton RE, Hughes B, Cruz JC, Haines BB, Chenard M, Kenific CM, Harsch A, Secrist JP, Miller TA. Delayed and Prolonged Histone Hyperacetylation with a Selective HDAC1/HDAC2 Inhibitor. ACS Med Chem Lett 2014; 5:340-5. [PMID: 24900838 DOI: 10.1021/ml4004233] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2013] [Accepted: 01/02/2014] [Indexed: 12/27/2022] Open
Abstract
The identification and in vitro and in vivo characterization of a potent SHI-1:2 are described. Kinetic analysis indicated that biaryl inhibitors exhibit slow binding kinetics in isolated HDAC1 and HDAC2 preparations. Delayed histone hyperacetylation and gene expression changes were also observed in cell culture, and histone acetylation was observed in vivo beyond disappearance of drug from plasma. In vivo studies further demonstrated that continuous target inhibition was well tolerated and efficacious in tumor-bearing mice, leading to tumor growth inhibition with either once-daily or intermittent administration.
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Affiliation(s)
- Joey L. Methot
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Dawn Mampreian Hoffman
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - David J. Witter
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Matthew G. Stanton
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Paul Harrington
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Christopher Hamblett
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Phieng Siliphaivanh
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Kevin Wilson
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Jed Hubbs
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Richard Heidebrecht
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Astrid M. Kral
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Nicole Ozerova
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Judith C. Fleming
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Hongmei Wang
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Alexander A. Szewczak
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Richard E. Middleton
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Bethany Hughes
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Jonathan C. Cruz
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Brian B. Haines
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Melissa Chenard
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Candia M. Kenific
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Andreas Harsch
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - J. Paul Secrist
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Thomas A. Miller
- Merck Research Laboratories, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
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8
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Brooks K, Chia KM, Spoerri L, Mukhopadhyay P, Wigan M, Stark M, Pavey S, Gabrielli B. Defective Decatenation Checkpoint Function Is a Common Feature of Melanoma. J Invest Dermatol 2014; 134:150-158. [DOI: 10.1038/jid.2013.264] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 04/17/2013] [Accepted: 04/30/2013] [Indexed: 12/16/2022]
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Abstract
Mitosis is largely driven by posttranslational modifications of proteins. Recent studies suggest that protein acetylation is prevalent in mitosis, but how protein acetylation/deacetylation regulates mitotic progression remains unclear. Nuclear distribution protein C (NudC), a conserved protein that regulates cell division, was previously shown to be acetylated. We found that NudC acetylation was decreased during mitosis. Using mass spectrometry analysis, we identified K39 to be an acetylation site on NudC. Reconstitution of NudC-deficient cells with wild-type or K39R acetylation-defective NudC rescued mitotic phenotypes, including chromosome misalignment, chromosome missegregation, and reduced spindle width, observed after NudC protein knockdown. In contrast, the K39Q acetylation-mimetic NudC was unable to rescue these mitotic phenotypes, suggesting that NudC deacetylation is important for mitotic progression. To examine proteins that may play a role in NudC deacetylation during mitosis, we found that NudC co-localizes on the mitotic spindle with the histone deacetylase HDAC3, an HDAC shown to regulate mitotic spindle stability. Further, NudC co-immunoprecipitates with HDAC3 and loss of function of HDAC3 either by protein knockdown or inhibition with a small molecule inhibitor increased NudC acetylation. These observations suggest that HDAC3 may be involved in NudC deacetylation during mitosis. Cells with NudC or HDAC3 knockdown exhibited overlapping mitotic abnormalities, including chromosomes arranged in a “dome-like” configuration surrounding a collapsed mitotic spindle. Our studies suggest that NudC acetylation/deacetylation regulates mitotic progression and NudC deacetylation, likely through HDAC3, is critical for spindle function and chromosome congression.
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Gabrielli B, Brown M. Histone deacetylase inhibitors disrupt the mitotic spindle assembly checkpoint by targeting histone and nonhistone proteins. Adv Cancer Res 2013; 116:1-37. [PMID: 23088867 DOI: 10.1016/b978-0-12-394387-3.00001-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Histone deacetylase inhibitors exhibit pleiotropic effects on cell functions, both in vivo and in vitro. One of the more dramatic effects of these drugs is their ability to disrupt normal mitotic division, which is a significant contributor to the anticancer properties of these drugs. The most important feature of the disrupted mitosis is that drug treatment overcomes the mitotic spindle assembly checkpoint and drives mitotic slippage, but in a manner that triggers apoptosis. The mechanism by which histone deacetylase inhibitors affect mitosis is now becoming clearer through the identification of a number of chromatin and nonchromatin protein targets that are critical to the regulation of normal mitotic progression and cell division. These proteins are directly regulated by acetylation and deacetylation, or in some cases indirectly through the acetylation of essential partner proteins. There appears to be little contribution from deacetylase inhibitor-induced transcriptional changes to the mitotic effects of these drugs. The overall mitotic phenotype of drug treatment appears to be the sum of these disrupted mechanisms.
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Affiliation(s)
- Brian Gabrielli
- The University of Queensland Diamantina Institute, Princess Alexandra Hospital, Brisbane, Queensland, Australia.
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Fadri-Moskwik M, Weiderhold KN, Deeraksa A, Chuang C, Pan J, Lin SH, Yu-Lee LY. Aurora B is regulated by acetylation/deacetylation during mitosis in prostate cancer cells. FASEB J 2012; 26:4057-67. [PMID: 22751009 PMCID: PMC3448774 DOI: 10.1096/fj.12-206656] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Accepted: 06/20/2012] [Indexed: 12/12/2022]
Abstract
Protein acetylation has been implicated in playing an important role during mitotic progression. Aurora B kinase is known to play a critical role in mitosis. However, whether Aurora B is regulated by acetylation is not known. Using IP with an anti-acetyl lysine antibody, we identified Aurora B as an acetylated protein in PC3 prostate cancer cells. Knockdown of HDAC3 or inhibiting HDAC3 deacetylase activity led to a significant increase (P<0.01 and P<0.05, respectively) in Aurora B acetylation as compared to siLuc or vehicle-treated controls. Increased Aurora B acetylation is correlated with a 30% reduction in Aurora B kinase activity in vitro and resulted in significant defects in Aurora B-dependent mitotic processes, including kinetochore-microtubule attachment and chromosome congression. Furthermore, Aurora B transiently interacts with HDAC3 at the kinetochore-microtubule interface of congressing chromosomes during prometaphase. This window of interaction corresponded with a transient but significant reduction (P=0.02) in Aurora B acetylation during early mitosis. Together, these results indicate that Aurora B is more active in its deacetylated state and further suggest a new mechanism by which dynamic acetylation/deacetylation acts as a rheostat to fine-tune Aurora B activity during mitotic progression.
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Affiliation(s)
| | | | | | - Carol Chuang
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA; and
| | | | - Sue-Hwa Lin
- Department of Molecular Pathology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Li-Yuan Yu-Lee
- Department of Medicine
- Interdepartmental Program in Cell and Molecular Biology, and
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA; and
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G9a/GLP histone lysine dimethyltransferase complex activity in the hippocampus and the entorhinal cortex is required for gene activation and silencing during memory consolidation. J Neurosci 2012; 32:5440-53. [PMID: 22514307 DOI: 10.1523/jneurosci.0147-12.2012] [Citation(s) in RCA: 167] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Learning triggers alterations in gene transcription in brain regions such as the hippocampus and the entorhinal cortex (EC) that are necessary for long-term memory (LTM) formation. Here, we identify an essential role for the G9a/G9a-like protein (GLP) lysine dimethyltransferase complex and the histone H3 lysine 9 dimethylation (H3K9me2) marks it catalyzes, in the transcriptional regulation of genes in area CA1 of the rat hippocampus and the EC during memory consolidation. Contextual fear learning increased global levels of H3K9me2 in area CA1 and the EC, with observable changes at the Zif268, DNMT3a, BDNF exon IV, and cFOS gene promoters, which occurred in concert with mRNA expression. Inhibition of G9a/GLP in the EC, but not in the hippocampus, enhanced contextual fear conditioning relative to control animals. The inhibition of G9a/GLP in the EC induced several histone modifications that include not only methylation but also acetylation. Surprisingly, we found that downregulation of G9a/GLP activity in the EC enhanced H3K9me2 in area CA1, resulting in transcriptional silencing of the non-memory permissive gene COMT in the hippocampus. In addition, synaptic plasticity studies at two distinct EC-CA1 cellular pathways revealed that G9a/GLP activity is critical for hippocampus-dependent long-term potentiation initiated in the EC via the perforant pathway, but not the temporoammonic pathway. Together, these data demonstrate that G9a/GLP differentially regulates gene transcription in the hippocampus and the EC during memory consolidation. Furthermore, these findings support the possibility of a role for G9a/GLP in the regulation of cellular and molecular cross talk between these two brain regions during LTM formation.
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13
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Kuratnik A, Senapati VE, Verma R, Mellone BG, Vella AT, Giardina C. Acute sensitization of colon cancer cells to inflammatory cytokines by prophase arrest. Biochem Pharmacol 2012; 83:1217-28. [PMID: 22306067 DOI: 10.1016/j.bcp.2012.01.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 01/17/2012] [Accepted: 01/18/2012] [Indexed: 02/08/2023]
Abstract
Understanding how colon cancer cells survive within the inflammatory milieu of a tumor, and developing approaches that increase their sensitivity to inflammatory cytokines, may ultimately lead to novel approaches for colon cancer therapy and prevention. Analysis of a number of chemopreventive and therapeutic agents reveal that HDAC inhibitors are particularly adept at sensitizing colon cancer cells TNF or TRAIL mediated apoptosis. In vivo data are consistent with an interaction between SAHA and TNF in inducing apoptosis, as AOM-induced colon tumors express elevated levels of TNF and are more sensitive to SAHA administration. Cell cycle analysis and time-lapse imaging indicated a close correspondence between SAHA-induced prophase arrest and TNF or TRAIL-induced apoptosis. Prophase arrest induced by the Aurora kinase inhibitor VX680 likewise sensitized cells to TNF and TRAIL, with siRNA analysis pointing to Aurora kinase A (and not Aurora kinase B) as being the relevant target for this sensitization. We propose that agents that promote prophase arrest may help sensitize cancer cells to TNF and other inflammatory cytokines. We also discuss how circumvention of an early mitotic checkpoint may facilitate cancer cell survival in the inflammatory micro-environment of the tumor.
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Affiliation(s)
- Anton Kuratnik
- Department of Molecular and Cell Biology, 91 North Eagleville Road, University of Connecticut, Storrs, CT 06269, United States
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14
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Park JA, Kim AJ, Kang Y, Jung YJ, Kim HK, Kim KC. Deacetylation and methylation at histone H3 lysine 9 (H3K9) coordinate chromosome condensation during cell cycle progression. Mol Cells 2011; 31:343-9. [PMID: 21359677 PMCID: PMC3933963 DOI: 10.1007/s10059-011-0044-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 01/04/2011] [Accepted: 01/13/2011] [Indexed: 01/26/2023] Open
Abstract
Interphasic chromatin condenses into the chromosomes in order to facilitate the correct segregation of genetic information. It has been previously reported that the phosphorylation and methylation of the N-terminal tail of histone H3 are responsible for chromosome condensation. In this study, we demonstrate that the deacetylation and methylation of histone H3 lysine 9 (H3K9) are required for proper chromosome condensation. We confirmed that H3K9ac levels were reduced, whereas H3K9me3 levels were increased in mitotic cells, via immunofluorescence and Western blot analysis. Nocodazole treatment induced G2/M arrest but co-treatment with TSA, an HDAC inhibitor, delayed cell cycle progression. However, the HMTase inhibitor, AdoX, had no effect on nocodazole-induced G2/M arrest, thereby indicating that sequential modifications of H3K9 are required for proper chromosome condensation. The expression of SUV39H1 and SETDB1, H3K9me3-responsible HMTases, are specifically increased along with H3K9me3 in nocodazole-arrested buoyant cells, which suggests that the increased expression of those proteins is an important step in chromosome condensation. H3K9me3 was highly concentrated in the vertical chromosomal axis during prophase and prometaphase. Collectively, the results of this study indicate that sequential modifications at H3K9 are associated with correct chromosome condensation, and that H3K9me3 may be relevant to the condensation of chromosome length.
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Affiliation(s)
- Jin-Ah Park
- Medical and Bio-Material Research Center and Department of Biology, College of Natural Sciences, Kangwon National University, Chuncheon 200-701, Korea
| | - Ae-Jin Kim
- Medical and Bio-Material Research Center and Department of Biology, College of Natural Sciences, Kangwon National University, Chuncheon 200-701, Korea
| | - Yoonsung Kang
- DNA Repair Research Center and Department of Bio-Materials, Chosun University, Gwangju 501-759, Korea
| | - Yu-Jin Jung
- Medical and Bio-Material Research Center and Department of Biology, College of Natural Sciences, Kangwon National University, Chuncheon 200-701, Korea
| | - Hyong Kyu Kim
- College of Medicine, Chungbuk National University, Cheongju 361-763, Korea
| | - Keun-Cheol Kim
- Medical and Bio-Material Research Center and Department of Biology, College of Natural Sciences, Kangwon National University, Chuncheon 200-701, Korea
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Chia K, Beamish H, Jafferi K, Gabrielli B. The Histone Deacetylase Inhibitor MGCD0103 Has Both Deacetylase and Microtubule Inhibitory Activity. Mol Pharmacol 2010; 78:436-43. [DOI: 10.1124/mol.110.065169] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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