scholarly journals Histone Deacetylase Inhibitors Reduce Steroidogenesis through SCF-Mediated Ubiquitination and Degradation of Steroidogenic Factor 1 (NR5A1)

2007 ◽  
Vol 27 (20) ◽  
pp. 7284-7290 ◽  
Author(s):  
Wei-Yi Chen ◽  
Jui-Hsia Weng ◽  
Chen-Che Huang ◽  
Bon-chu Chung
Keyword(s):  
Histone Deacetylase ◽  
Ubiquitin Ligase ◽  
Histone Deacetylase Inhibitors ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
E3 Ubiquitin Ligase ◽  
Steroidogenic Factor 1 ◽  
A Subunit ◽  
F Box Protein ◽  
Interfering Rna

ABSTRACT Histone deacetylase (HDAC) inhibitors such as trichostatin A and valproic acid modulate transcription of many genes by inhibiting the activities of HDACs, resulting in the remodeling of chromatin. Yet this effect is not universal for all genes. Here we show that HDAC inhibitors suppressed the expression of steroidogenic gene CYP11A1 and decreased steroid secretion by increasing the ubiquitination and degradation of SF-1, a factor important for the transcription of all steroidogenic genes. This was accompanied by increased expression of Ube2D1 and SKP1A, an E2 ubiquitin conjugase and a subunit of the E3 ubiquitin ligase in the Skp1/Cul1/F-box protein (SCF) family, respectively. Reducing SKP1A expression with small interfering RNA resulted in recovery of SF-1 levels, demonstrating that the activity of SCF E3 ubiquitin ligase is required for the SF-1 degradation induced by HDAC inhibitors. Overexpression of exogenous SF-1 restored steroidogenic activities even in the presence of HDAC inhibitors. Thus, increased SF-1 degradation is the cause of the reduction in steroidogenesis caused by HDAC inhibitors. The increased SKP1A expression and SCF-mediated protein degradation could be the mechanism underlying the mode of action of HDAC inhibitors.

scholarly journals Histone Deacetylase Inhibitors Down-Regulate bcl-2 Expression and Induce Apoptosis in t(14;18) Lymphomas

2005 ◽  
Vol 25 (5) ◽  
pp. 1608-1619 ◽  
Author(s):  
Hong Duan ◽  
Caroline A. Heckman ◽  
Linda M. Boxer
Keyword(s):  
Cell Cycle ◽  
Histone Deacetylase ◽  
Chromatin Immunoprecipitation ◽  
Histone Deacetylase Inhibitors ◽  
Antitumor Agents ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
Transcriptional Level ◽  
Cycle Arrest ◽  
Induced Apoptosis

ABSTRACT Histone deacetylase (HDAC) inhibitors are promising antitumor agents, but they have not been extensively explored in B-cell lymphomas. Many of these lymphomas have the t(14;18) translocation, which results in increased bcl-2 expression and resistance to apoptosis. In this study, we examined the effects of two structurally different HDAC inhibitors, trichostatin A (TSA) and sodium butyrate (NaB), on the cell cycle, apoptosis, and bcl-2 expression in t(14;18) lymphoma cells. We found that in addition to potent cell cycle arrest, TSA and NaB also dramatically induced apoptosis and down-regulated bcl-2 expression, and overexpression of bcl-2 inhibited TSA-induced apoptosis. The repression of bcl-2 by TSA occurred at the transcriptional level. Western blot analysis and quantitative chromatin immunoprecipitation (ChIP) assay showed that even though HDAC inhibitors increased overall acetylation of histones, localized histone H3 deacetylation occurred at both bcl-2 promoters. TSA treatment increased the acetylation of the transcription factors Sp1 and C/EBPα and decreased their binding as well as the binding of CBP and HDAC2 to the bcl-2 promoters. Mutation of Sp1 and C/EBPα binding sites reduced the TSA-induced repression of bcl-2 promoter activity. This study provides a mechanistic rationale for the use of HDAC inhibitors in the treatment of human t(14;18) lymphomas.

scholarly journals Histone deacetylase inhibitors suppress IL-2–mediated gene expression prior to induction of apoptosis

Blood ◽  
2000 ◽  
Vol 96 (4) ◽  
pp. 1490-1495 ◽  
Author(s):  
Yuko Koyama ◽  
Masaaki Adachi ◽  
Masuo Sekiya ◽  
Mutsuhiro Takekawa ◽  
Kohzoh Imai
Keyword(s):  
Gene Expression ◽  
Histone Deacetylase ◽  
Transcriptional Activation ◽  
Histone Deacetylase Inhibitors ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
K562 Cells ◽  
Histone Hyperacetylation ◽  
Induced Apoptosis ◽  
Do So

Histone deacetylase (HDAC) inhibitors can induce transcriptional activation of a number of genes and induce cellular differentiation as histone acetylation levels increase. Although these inhibitors induce apoptosis in several cell lines, the precise mechanism by which they do so remains obscure. This study shows that HDAC inhibitors, sodium butyrate and trichostatin A (TSA), abrogate interleukin (IL)-2–mediated gene expression in IL-2–dependent cells. The HDAC inhibitors readily induced apoptosis in IL-2–dependent ILT-Mat cells and BAF-B03 transfectants expressing the IL-2 receptor βc chain, whereas they induced far less apoptosis in cytokine-independent K562 cells. However, these inhibitors similarly increased acetylation levels of histones in both cells. Although histone hyperacetylation is believed to lead to transcriptional activation, the results showed an abrogation of IL-2–mediated induction of c-myc,bag-1, and LC-PTP gene expression. This observed abrogation of gene expression occurred prior to phosphatidylserine externalization, a process that occurs in early apoptotic cells. Considering the biologic role played by IL-2–mediated gene expression in cell survival, these data suggest that its abrogation may contribute to the apoptotic process induced by HDAC inhibitors.

scholarly journals Improved development of mouse SCNT embryos by chlamydocin analogues, class I and IIa histone deacetylase inhibitors†

2021 ◽  
Author(s):  
Satoshi Kamimura ◽  
Kimiko Inoue ◽  
Eiji Mizutani ◽  
Jin-Moon Kim ◽  
Hiroki Inoue ◽  
...  
Keyword(s):  
Histone Deacetylase ◽  
Histone Deacetylase Inhibitors ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
Class I ◽  
Cell Stage ◽  
Inhibitory Spectrum ◽  
Developmental Block

Abstract In mammalian cloning by somatic cell nuclear transfer (SCNT), treatment of reconstructed embryos with histone deacetylase (HDAC) inhibitors improves efficiency. So far, most of those used for SCNT are hydroxamic acid derivatives—such as trichostatin A—characterized by their broad inhibitory spectrum. Here, we examined whether mouse SCNT efficiency could be improved using chlamydocin analogues, a family of newly designed agents that specifically inhibit Class I and IIa HDACs. Development of SCNT-derived embryos in vitro and in vivo revealed that four out of five chlamydocin analogues tested could promote the development of cloned embryos. The highest pup rates (7.1 to 7.2%) were obtained with Ky-9, similar to those achieved with trichostatin A (7.2 to 7.3%). Thus, inhibition of Class I and/or IIa HDACs in SCNT-derived embryos is enough for significant improvements in full-term development. In mouse SCNT, the exposure of reconstructed oocytes to HDAC inhibitors is limited to 8–10 h because longer inhibition with Class I inhibitors causes a 2-cell developmental block. Therefore, we used Ky-29, with higher selectivity for Class IIa than Class I HDACs for longer treatment of SCNT-derived embryos. As expected, 24-h treatment with Ky-29 up to the 2-cell stage did not induce a developmental block, but the pup rate was not improved. This suggests that the 1-cell stage is a critical period for improving SCNT cloning using HDAC inhibitors. Thus, chlamydocin analogues appear promising for understanding and improving the epigenetic status of mammalian SCNT-derived embryos through their specific inhibitory effects on HDACs.

scholarly journals The ubiquitin ligase RNF5 determines acute myeloid leukemia growth and susceptibility to histone deacetylase inhibitors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ali Khateb ◽  
Anagha Deshpande ◽  
Yongmei Feng ◽  
Darren Finlay ◽  
Joo Sang Lee ◽  
...  
Keyword(s):  
Acute Myeloid Leukemia ◽  
Histone Deacetylase ◽  
Ubiquitin Ligase ◽  
Myeloid Leukemia ◽  
Histone Deacetylase Inhibitors ◽  
Hdac Inhibitors ◽  
Favorable Prognosis ◽  
Transcriptional Changes ◽  
Acute Myeloid

AbstractAcute myeloid leukemia (AML) remains incurable, largely due to its resistance to conventional treatments. Here, we find that increased abundance of the ubiquitin ligase RNF5 contributes to AML development and survival. High RNF5 expression in AML patient specimens correlates with poor prognosis. RNF5 inhibition decreases AML cell growth in culture, in patient-derived xenograft (PDX) samples and in vivo, and delays development of MLL-AF9–driven leukemogenesis in mice, prolonging their survival. RNF5 inhibition causes transcriptional changes that overlap with those seen upon histone deacetylase (HDAC)1 inhibition. RNF5 induces the formation of K29 ubiquitin chains on the histone-binding protein RBBP4, promoting its recruitment to and subsequent epigenetic regulation of genes involved in AML maintenance. Correspondingly, RNF5 or RBBP4 knockdown enhances AML cell sensitivity to HDAC inhibitors. Notably, low expression of both RNF5 and HDAC coincides with a favorable prognosis. Our studies identify an ERAD-independent role for RNF5, demonstrating that its control of RBBP4 constitutes an epigenetic pathway that drives AML, and highlight RNF5/RBBP4 as markers useful to stratify patients for treatment with HDAC inhibitors.

Histone deacetylase inhibitors suppress IFNα-induced up-regulation of promyelocytic leukemia protein

Blood ◽  
2006 ◽  
Vol 109 (4) ◽  
pp. 1373-1380 ◽  
Author(s):  
Jana Vlasáková ◽  
Zora Nováková ◽  
Lenka Rossmeislová ◽  
Michal Kahle ◽  
Pavel Hozák ◽  
...  
Keyword(s):  
Histone Deacetylase ◽  
Transcriptional Activation ◽  
Histone Deacetylases ◽  
Histone Deacetylase Inhibitors ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
Eukaryotic Cell ◽  
Promyelocytic Leukemia ◽  
Nuclear Bodies ◽  
Interferon Α

Abstract Promyelocytic leukemia nuclear bodies (PML NBs), the structural domains of the eukaryotic cell nucleus, play a role in cancer and apoptosis, and their involvement in antiviral mechanisms mediated by interferons (IFNs) is proposed. IFNs dramatically increase the transcription of the PML gene. In this study, we have shown that the response of 2 structural PML NB components, PML and Sp100, to interferon-α (IFNα) was suppressed in cells simultaneously treated with histone deacetylase (HDAC) inhibitors (trichostatin A, sodium butyrate, MS-275, SAHA, and valproic acid). Trichostatin A (TSA) blocked the increase of PML NB number and suppressed up-regulation of PML mRNA and protein levels in several human cell lines and in normal diploid skin fibroblasts. Moreover, IFNα induction of IRF-1 was also inhibited by TSA, although incompletely. Analysis of cellular fractions did not show any defects in cytoplasmic-nuclear transport of STAT2, a component of transcription factor ISGF3 responsible for IFNα/β-dependent gene transcription. Moreover, chromatin immunoprecipitation showed that after IFNα stimulation STAT2 binds to ISRE element of PML promoter even in the presence of TSA and thus excluded STAT2-dependent mechanism of TSA effect. These results indicate that the action of histone deacetylases is necessary for the full transcriptional activation of IFNα-stimulated genes.

scholarly journals Cul4A and DDB1 Associate with Skp2 To Target p27Kip1 for Proteolysis Involving the COP9 Signalosome

2006 ◽  
Vol 26 (7) ◽  
pp. 2531-2539 ◽  
Author(s):  
Tanya Bondar ◽  
Anna Kalinina ◽  
Lyne Khair ◽  
Dragana Kopanja ◽  
Alo Nag ◽  
...  
Keyword(s):  
Decay Rate ◽  
Fission Yeast ◽  
Ubiquitin Ligase ◽  
Mammalian Cells ◽  
Cop9 Signalosome ◽  
A Subunit ◽  
Replication Inhibitor ◽  
F Box Protein ◽  
Interfering Rna

ABSTRACT DDB1, a subunit of the damaged-DNA binding protein DDB, has been shown to function also as an adaptor for Cul4A, a member of the cullin family of E3 ubiquitin ligase. The Cul4A-DDB1 complex remains associated with the COP9 signalosome, and that interaction is conserved from fission yeast to human. Studies with fission yeast suggested a role of the Pcu4-Ddb1-signalosome complex in the proteolysis of the replication inhibitor Spd1. Here we provide evidence that the function of replication inhibitor proteolysis is conserved in the mammalian DDB1-Cul4A-signalosome complex. We show that small interfering RNA-mediated knockdown of DDB1, CSN1 (a subunit of the signalosome), and Cul4A in mammalian cells causes an accumulation of p27Kip1. Moreover, expression of DDB1 reduces the level of p27Kip1 by increasing its decay rate. The DDB1-induced proteolysis of p27Kip1 requires signalosome and Cul4A, because DDB1 failed to increase the decay rate of p27Kip1 in cells deficient in CSN1 or Cul4A. Surprisingly, the DDB1-induced proteolysis of p27Kip1 also involves Skp2, an F-box protein that allows targeting of p27Kip1 for ubiquitination by the Skp1-Cul1-F-box complex. Moreover, we provide evidence for a physical association between Cul4A, DDB1, and Skp2. We speculate that the F-box protein Skp2, in addition to utilizing Cul1-Skp1, utilizes Cul4A-DDB1 to induce proteolysis of p27Kip1.

scholarly journals RNF5 Regulation of RBBP4 Defines Acute Myeloid Leukemia Growth and Susceptibility to Histone Deacetylase Inhibitors

2020 ◽  
Author(s):  
Ali Khateb ◽  
Anagha Deshpande ◽  
Yongmei Feng ◽  
Joo Sang Lee ◽  
Ikrame Lazar ◽  
...  
Keyword(s):  
Acute Myeloid Leukemia ◽  
Histone Deacetylase ◽  
Ubiquitin Ligase ◽  
Myeloid Leukemia ◽  
Histone Deacetylase Inhibitors ◽  
Hdac Inhibitors ◽  
Favorable Prognosis ◽  
Transcriptional Changes ◽  
Acute Myeloid

ABSTRACTAcute myeloid leukemia (AML) remains incurable, largely due to its resistance to conventional treatments. Here, we found that increased expression and abundance of the ubiquitin ligase RNF5 contributes to AML development and survival. High RNF5 expression in AML patients correlated with poor prognosis. RNF5 inhibition decreased AML cell growth in culture and in vivo, and blocked development of MLL-AF9–driven leukemogenesis in mice, prolonging their survival. RNF5 inhibition led to transcriptional changes that overlapped with those seen upon HDAC1 inhibition. RNF5 induced the formation of K29 ubiquitin chains on the histone-binding protein RBBP4, promoting its recruitment and subsequent epigenetic regulation of genes involved in AML development and maintenance. Correspondingly, RNF5 or RBBP4 knockdown enhanced the sensitivity of AML cells to histone deacetylase (HDAC) inhibitors. Notably, low expression of RNF5 and HDAC coincided with a favorable prognosis. Our studies identified ERAD-independent role for RNF5, demonstrating that its control of RBBP4 constitutes an epigenetic pathway that drives AML while highlighting RNF5/RBBP4 as markers to stratify patients for treatment with HDAC inhibitors.

Determination of the class and isoform selectivity of small-molecule histone deacetylase inhibitors

2007 ◽  
Vol 409 (2) ◽  
pp. 581-589 ◽  
Author(s):  
Nagma Khan ◽  
Michael Jeffers ◽  
Sampath Kumar ◽  
Craig Hackett ◽  
Ferenc Boldog ◽  
...  
Keyword(s):  
Histone Deacetylase ◽  
Histone Deacetylase Inhibitors ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
Specific Inhibitor ◽  
Class Ii ◽  
Class I ◽  
Regulation Of Transcription ◽  
Control Of Gene Expression ◽  
Inhibitor Treatment

The human HDAC (histone deacetylase) family, a well-validated anticancer target, plays a key role in the control of gene expression through regulation of transcription. While HDACs can be subdivided into three main classes, the class I, class II and class III HDACs (sirtuins), it is presently unclear whether inhibiting multiple HDACs using pan-HDAC inhibitors, or targeting specific isoforms that show aberrant levels in tumours, will prove more effective as an anticancer strategy in the clinic. To address the above issues, we have tested a number of clinically relevant HDACis (HDAC inhibitors) against a panel of rhHDAC (recombinant human HDAC) isoforms. Eight rhHDACs were expressed using a baculoviral system, and a Fluor de Lys™ (Biomol International) HDAC assay was optimized for each purified isoform. The potency and selectivity of ten HDACs on class I isoforms (rhHDAC1, rhHDAC2, rhHDAC3 and rhHDAC8) and class II HDAC isoforms (rhHDAC4, rhHDAC6, rhHDAC7 and rhHDAC9) was determined. MS-275 was HDAC1-selective, MGCD0103 was HDAC1- and HDAC2-selective, apicidin was HDAC2- and HDAC3-selective and valproic acid was a specific inhibitor of class I HDACs. The hydroxamic acid-derived compounds (trichostatin A, NVP-LAQ824, panobinostat, ITF2357, vorinostat and belinostat) were potent pan-HDAC inhibitors. The growth-inhibitory effect of the HDACis on HeLa cells showed that both pan-HDAC and class-I-specific inhibitors inhibited cell growth. The results also showed that both pan-HDAC and class-I-specific inhibitor treatment resulted in increased acetylation of histones, but only pan-HDAC inhibitor treatment resulted in increased tubulin acetylation, which is in agreement with their activity towards the HDAC6 isoform.

scholarly journals Histone deacetylase inhibitors suppress IL-2–mediated gene expression prior to induction of apoptosis

Blood ◽  
2000 ◽  
Vol 96 (4) ◽  
pp. 1490-1495 ◽  
Author(s):  
Yuko Koyama ◽  
Masaaki Adachi ◽  
Masuo Sekiya ◽  
Mutsuhiro Takekawa ◽  
Kohzoh Imai
Keyword(s):  
Gene Expression ◽  
Histone Deacetylase ◽  
Transcriptional Activation ◽  
Histone Deacetylase Inhibitors ◽  
Trichostatin A ◽  
Hdac Inhibitors ◽  
K562 Cells ◽  
Histone Hyperacetylation ◽  
Induced Apoptosis ◽  
Do So

Abstract Histone deacetylase (HDAC) inhibitors can induce transcriptional activation of a number of genes and induce cellular differentiation as histone acetylation levels increase. Although these inhibitors induce apoptosis in several cell lines, the precise mechanism by which they do so remains obscure. This study shows that HDAC inhibitors, sodium butyrate and trichostatin A (TSA), abrogate interleukin (IL)-2–mediated gene expression in IL-2–dependent cells. The HDAC inhibitors readily induced apoptosis in IL-2–dependent ILT-Mat cells and BAF-B03 transfectants expressing the IL-2 receptor βc chain, whereas they induced far less apoptosis in cytokine-independent K562 cells. However, these inhibitors similarly increased acetylation levels of histones in both cells. Although histone hyperacetylation is believed to lead to transcriptional activation, the results showed an abrogation of IL-2–mediated induction of c-myc,bag-1, and LC-PTP gene expression. This observed abrogation of gene expression occurred prior to phosphatidylserine externalization, a process that occurs in early apoptotic cells. Considering the biologic role played by IL-2–mediated gene expression in cell survival, these data suggest that its abrogation may contribute to the apoptotic process induced by HDAC inhibitors.

Abstract 2950: Distinct Regulation of Cardiac Function by Histone Deacetylase Inhibitors in Response to Pressure Overload

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Jing Ma ◽  
Tetsuo Minamino ◽  
Yoshihiro Asano ◽  
Yulin Liao ◽  
Masafumi Kitakaze ◽  
...  
Keyword(s):  
Histone Deacetylase ◽  
Cardiac Dysfunction ◽  
Histone Deacetylase Inhibitors ◽  
Diastolic Pressure ◽  
Trichostatin A ◽  
Control Point ◽  
Hdac Inhibitors ◽  
Pressure Overload ◽  
Heart Weight ◽  
Complex Signal

Background- Recent work has uncovered that histone acetylation might work as a nodal control point in the complex signal network for gene regulation in hypertrophic myocardium, moreover, histone deacetylase (HDAC)inhibitors might hold promise as potential therapeutic agents in hypertrophic heart disease. In this study, we tested the effects of some HDAC inhibitors on hypertrophy and subsequent cardiac dysfunction in response to pressure overload. Method and results- Transverse aortic constriction (TAC) operation were performed on C57BL/6J mice and pressure overload was successfully produced. Cardiac hypertrophy and dysfunction induced by TAC for 6 weeks were significantly blunted by trichostatin A (TSA) and valproic acid (VPA). In contrast, treatment by 4-Sodium phenylbutyrate (4-PBA) unexpectedly further exaggerated cardiac remodeling at week 6 compared with vehicle-treated mice, indicated by larger ratio of heart weight to body weight, bigger cross-sectional area and more enlarged left ventricle (LV) dimension. 4-PBA also led to lower ejection fraction and fractional shortening. Moreover, invasive hemodynamic measurements showed significantly higher LV end diastolic pressure (31.0 vs 15.5 mmHg, p<0.001) and lower contractivity index (120.8 vs 160.4, p<0.01) compared with vehicle-treated mice, suggesting the deterioration of diastolic and systolic function. In accordance with these data, the expressions of hypertrophic markers were further increased by 4-PBA administration. Kaplan-Meier analysis revealed significantly lower survival rate in 4-PBA-treated mice (32.7% vs 66.7%, p<0.001). Similarly, treatment with butyrate acid (BS), an analogue of 4-PBA, also achieved unbeneficial effect. All the 4 HDAC inhibitors successfully inhibited HDAC total activity in vivo and in vitro . Individual HDAC activity assay showed rather than class IIa members (HDAC 4 and 7), 4-PBA and BS predominantly inhibit class IHDACs (HDAC2 and 8), whereas VPA and TSA inhibit them all to a similar extent. Conclusion- Together, these data suggest that 4-PBA and BS accelerate load -induced hypertrophy and cardiac dysfunction, whereas VPA and TSA hold opposing effects. The distinct regulation might be due to differential selectivity on certain HDAC subtypes.

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