2. Signaling Pathways
  3. Cell Cycle/DNA Damage
    Epigenetics
  4. HDAC

HDAC

Histone deacetylases

HDAC

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HDAC (Histone deacetylases) are a class of enzymes that remove acetyl groups (O=C-CH3) from an ε-N-acetyl lysine amino acid on ahistone, allowing the histones to wrap the DNA more tightly. This is important because DNA is wrapped around histones, and DNA expression is regulated by acetylation and de-acetylation. Its action is opposite to that of histone acetyltransferase. HDAC proteins are now also called lysine deacetylases (KDAC), to describe their function rather than their target, which also includes non-histone proteins. Together with the acetylpolyamine amidohydrolases and the acetoin utilization proteins, the histone deacetylases form an ancient protein superfamily known as the histone deacetylase superfamily.

HDAC Isoform Specific Products:

HDAC Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-124295
    Imofinostat
    		Inhibitor 99.40%
    MPT0E028 is an orally active and selective HDAC inhibitor with IC50s of 53.0 nM, 106.2 nM, 29.5 nM for HDAC1, HDAC2 and HDAC6, respectively. MPT0E028 reduces the viability of B-cell lymphomas by inducing apoptosis and possesses potent direct Akt targeting ability and reduces Akt phosphorylation in B-cell lymphoma. MPT0E028 has good anticancer activity.
    Imofinostat
  • HY-114303
    CM-675
    		Inhibitor 99.53%
    CM-675 is a dual phosphodiesterase 5 (PDE5) and class I histone deacetylases-selective inhibitor, with IC50 values of 114 nM and 673 nM for PDE5 and HDAC1, respectively. CM-675 has potential to treat Alzheimer’s disease.
    CM-675
  • HY-145426
    MPT0B390
    		Inhibitor 99.18%
    MPT0B390 is an arylsulfonamide-based derivative with potent HDAC inhibitory ability. MPT0B390, TIMP3 inducer, inhibits tumor growth, metastasis and angiogenesis. MPT0B390 shows antiproliferative activity against human colon cancer cell line HCT116 with the GI50 of 0.03 μM.
    MPT0B390
  • HY-149285
    NT160
    		Inhibitor 99.58%
    NT160 is a highly potent class-IIa HDAC inhibitor with an IC50 value of 0.046 μM. NT160 can be used for the research of central nervous system diseases.
    NT160
  • HY-B0809R
    Theophylline (Standard)
    		Activator 99.99%
    Theophylline (Standard) is the analytical standard of Theophylline. This product is intended for research and analytical applications. Theophylline (1,3-Dimethylxanthine) is a potent phosphodiesterase (PDE) inhibitor, adenosine receptor antagonist, and histone deacetylase (HDAC) activator. Theophylline (1,3-Dimethylxanthine) inhibits PDE3 activity to relax airway smooth muscle. Theophylline (1,3-Dimethylxanthine) has anti-inflammatory activity by increase IL-10 and inhibit NF-κB into the nucleus. Theophylline (1,3-Dimethylxanthine) induces apoptosis. Theophylline (1,3-Dimethylxanthine) can be used for asthma and chronic obstructive pulmonary disease (COPD) research.
    Theophylline (Standard)
  • HY-P2462
    Ac-Arg-Gly-Lys(Ac)-AMC
    		99.27%
    Ac-Arg-Gly-Lys(Ac)-AMC is a substrate for HDAC.
    Ac-Arg-Gly-Lys(Ac)-AMC
  • HY-107549
    KD 5170
    		Inhibitor 98.13%
    KD 5170 is a pan inhibitor of histone deacetylases (HDACs) and exhibits broad spectrum antitumor activity in vitro and in vivo.
    KD 5170
  • HY-117709
    BRD6688
    		Inhibitor 98.90%
    BRD6688 is a selective HDAC2 inhibitor. BRD6688 increases H4K12 and H3K9 histone acetylation in primary mouse neuronal cells. BRD6688 crosses the blood brain barrier and rescues the memory defects associated with p25 induced neurodegeneration in contextual fear conditioning in a CK-p25 mouse model.
    BRD6688
  • HY-164099
    LSD1/HDAC6-IN-2
    		Inhibitor 99.66%
    LSD1/HDAC6-IN-2 (JBI-802) is an orally active LSD1/HDAC6/MAO-A inhibitor, with IC50 values of 5 nM, 11 nM, and 5 nM, respectively. LSD1/HDAC6-IN-2 can inhibit the growth of multiple myeloma cells MM.1S, MM.1R, and RPMI-8226. LSD1/HDAC6-IN-2 can be used for research on diseases such as acute myeloid leukemia and lymphoma.
    LSD1/HDAC6-IN-2
  • HY-12310
    RSC133
    		Inhibitor ≥98.0%
    RSC133 exhibits dual activity by inhibiting histone deacetylase and DNA methyltransferase. RSC133 effectively facilitates reprogramming of human somatic cells to pluripotent stem cells and supports the maintenance of an undifferentiated state of human pluripotent stem cells.
    RSC133
  • HY-10224A
    Panobinostat lactate
    		Inhibitor 98.67%
    Panobinostat lactate is a potent and orally active non-selective HDAC inhibitor. Panobinostat lactate has antineoplastic activities. Panobinostat lactate effectively disrupts HIV latency. Panobinostat lactate induces cell apoptosis and autophagy. Panobinostat lactate can be used for the study of refractory or relapsed multiple myeloma.
    Panobinostat lactate
  • HY-100585
    Splitomicin
    		Inhibitor 98.42%
    Splitomicin (Splitomycin) is a selective Sir2p inhibitor. Splitomicin inhibits NAD+-dependent HDAC activity of Sir2 protein. Splitomicin induces dose-dependent inhibition of HDAC in the yeast extract with an IC50 of 60 μM.
    Splitomicin
  • HY-19772
    GSK3117391
    		Inhibitor 99.40%
    GSK3117391 (ESM-HDAC391) is a histone deacetylase (HDAC) inhibitor, extracted from patent WO/2008040934 A1.
    GSK3117391
  • HY-100384
    NKL 22
    		Inhibitor
    NKL 22 (compound 4b) is a potent and selective inhibitor of histone deacetylases (HDAC), with an IC50 of 199 and 69 nM for HDAC1 and HDAC3, respectively. NKL 22 exhibits selectivity over HDAC2/4/5/7/8 (IC50≥1.59 μM). NKL 22 ameliorates the disease phenotype and transcriptional abnormalities in Huntington's disease transgenic mice.
    NKL 22
  • HY-109109
    Alteminostat
    		Inhibitor 98.66%
    Alteminostat (CKD-581) is a potent HDAC inhibitor. Alteminostat inhibits the class I-II HDAC family via histone H3 and tubulin acetylation. Alteminostat can be used for lymphoma and multiple myeloma research.
    Alteminostat
  • HY-160092A
    Martinostat hydrochloride
    		Inhibitor 99.01%
    Martinostat hydrochloride is a HDAC inhibitor and can be labeled with radionuclides for quantitative imaging of HDACs in vivo in the central nervous system and major peripheral organs.
    Martinostat hydrochloride
  • HY-10585S1
    Valproic acid-d6
    		Inhibitor 98.71%
    Valproic acid-d6 is the deuterium labeled Valproic acid. Valproic acid (VPA; 2-Propylpentanoic Acid) is an HDAC inhibitor, with IC50 in the range of 0.5 and 2 mM, also inhibits HDAC1 (IC50, 400 μM), and induces proteasomal degradation of HDAC2. Valproic acid activates Notch1 signaling and inhibits proliferation in small cell lung cancer (SCLC) cells. Valproic acid sodium salt is used in the treatment of epilepsy, bipolar disorder and prevention of migraine headaches[1][2].
    Valproic acid-d<sub>6</sub>
  • HY-110280
    MC1742
    		Inhibitor 99.20%
    MC1742 is a potent HDAC inhibitor, with IC50s of 0.1 μM, 0.11 μM, 0.02 μM, 0.007 μM, 0.61 μM, 0.04 μM and 0.1 μM for HDAC1, HDAC2, HDAC3, HDAC6, HDAC8, HDAC10 and HDAC11, respectively. MC1742 can increase acetyl-H3 and acetyl-tubulin levels and inhibits cancer stem cells growth. MC1742 can induce growth arrest, apoptosis, and differentiation in sarcoma CSC.
    MC1742
  • HY-156274
    HDAC6-IN-23
    		Inhibitor 99.61%
    HDAC6-IN-23 (compound 9) is an orally active HDAC6 inhibitor.
    HDAC6-IN-23
  • HY-119017
    SB-429201
    		Inhibitor 98.15%
    SB-429201 is a potent and selective HDAC1 (IC50~1.5 μM). SB-429201 displays at least a 20-fold preference for HDAC1 inhibition over HDAC3 and HDAC8.
    SB-429201
Cat. No. Product Name / Synonyms Application Reactivity
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Download HDAC Signaling Pathway Map.

TCR, GPCR and HDAC II interaction: Diverse agonists act through G-protein-coupled receptors (GPCRs) to activate the PKC-PKD axis, CaMK, Rho, or MHC binding to antigens stimulates TCR to activate PKD, leading to phosphorylation of class II HDACs. Phospho-HDACs dissociate from MEF2, bind 14-3-3, and are exported to the cytoplasm through a CRM1-dependent mechanism. CRM1 is inhibited by leptomycin B (LMB). Release of MEF2 from class II HDACs allows p300 to dock on MEF2 and stimulate gene expression. Dephosphorylation of class II HDACs in the cytoplasm enables reentry into the nucleus[1].

 

TLR: TLR signaling is initiated by ligand binding to receptors. The recruitment of TLR domain-containing adaptor protein MyD88 is repressed by HDAC6, whereas NF-κB and MTA-1 can be negatively regulated by HDAC1/2/3 and HDAC2, respectively. Acetylation by HATs enhance MKP-1 which inhibits p38-mediated inflammatory responses, while HDAC1/2/3 inhibits MKP-1 activity. HDAC1 and HDAC8 repress, whereas HDAC6 promotes, IRF function in response to viral challenge. HDAC11 inhibits IL-10 expression and HDAC1 and HDAC2 represses IFNγ-dependent activation of the CIITA transcription factor, thus affecting antigen presentation[2][3].

 

IRNAR: IFN-α/β induce activation of the type I IFN receptor and then bring the receptor-associated JAKs into proximity. JAK adds phosphates to the receptor. STATs bind to the phosphates and then phosphorylated by JAKs to form a dimer, leading to nuclear translocation and gene expression. HDACs positively regulate STATs and PZLF to promote antiviral responses and IFN-induced gene expression[2][3].

 

Cell cycle: In G1 phase, HDAC, Retinoblastoma protein (RB), E2F and polypeptide (DP) form a repressor complex. HDAC acts on surrounding chromatin, causing it to adopt a closed chromatin conformation, and transcription is repressed. Prior to the G1-S transition, phosphorylation of RB by CDKs dissociates the repressor complex. Transcription factors (TFs) gain access to their binding sites and, together with the now unmasked E2F activation domain. E2F is then free to activate transcription by contacting basal factors or by contacting histone acetyltransferases, such as CBP, that can alter chromatin structure[4].

 

The function of non-histone proteins is also regulated by HATs/HDACs. p53: HDAC1 impairs the function of p53. p53 is acetylated under conditions of stress or HDAC inhibition by its cofactor CREB binding protein (CBP) and the transcription of genes involved in differentiation is activated. HSP90: HSP90 is a chaperone that complexes with other chaperones, such as p23, to maintain correct conformational folding of its client proteins. HDAC6 deacetylates HSP90. Inhibition of HDAC6 would result in hyperacetylated HSP90, which would be unable to interact with its co-chaperones and properly lead to misfolded client proteins being targeted for degradation via the ubiquitin-proteasome system[5][6].
 

Reference:

[1]. Vega RB, et al. Protein kinases C and D mediate agonist-dependent cardiac hypertrophy through nuclear export of histone deacetylase 5.Mol Cell Biol. 2004 Oct;24(19):8374-85.
[2]. Shakespear MR, et al. Histone deacetylases as regulators of inflammation and immunity. Trends Immunol. 2011 Jul;32(7):335-43.
[3]. Suliman BA, et al. HDACi: molecular mechanisms and therapeutic implications in the innate immune system.Immunol Cell Biol. 2012 Jan;90(1):23-32. 
[4]. Brehm A, et al. Retinoblastoma protein meets chromatin.Trends Biochem Sci. 1999 Apr;24(4):142-5.
[5]. Butler R, et al. Histone deacetylase inhibitors as therapeutics for polyglutamine disorders.Nat Rev Neurosci. 2006 Oct;7(10):784-96
[6]. Minucci S, et al. Histone deacetylase inhibitors and the promise of epigenetic (and more) treatments for cancer.Nat Rev Cancer. 2006 Jan;6(1):38-51.

HDAC Isoform Comparison

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