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20 protocols using hdac activity fluorometric assay kit

1

Fluorometric HDAC Activity Assay

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Two different types of in vitro HDAC activity assays were used (with or without cells). Test compounds were incubated with individual recombinant HDAC isoforms (HDAC 1-9) and the assay was performed according to the manufacturer's protocol (BPS Biosciences, USA). HT-29 cells were treated with MPT0G030 and SAHA for 24 h, and then total cell lysates were analyzed with Fluorometric HDAC Activity Assay Kit (BioVision, USA).
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2

Quantifying HDAC Activity in Kidney

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To determine the activity of HDAC, equal quantities of nuclear fraction proteins (20 μg) were extracted from kidney tissue (Active Motif, 40010), and analyzed using a Fluorometric HDAC Activity Assay Kit (BioVision, k330-100) as described previously (Wu et al., 2020 ).
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HDAC Activity Assay in PBMCs

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Global HDAC activity in PBMC nuclear extract was assessed using a Fluorometric HDAC Activity Assay Kit (Biovision, CA). All PBMC samples were incubated with HDAC substrate (Boc-Lys(Ac)-AMC). Deacetylation of substrate sensitizes substrate, and further addition of lysine developer produces a fluorophore, which was captured as the fluorescence read-out using a plate reader with Ex. = 350–380 nm and Em. = 440–460 nm settings. The standard curve was prepared as per recommended dilution range by the kit protocol. The absolute HDAC activity was calculated based on the slope determined by the standard deacetylated curve and expressed as μM/mL. Positive and negative controls were carried out during every experiment. Specific HDAC3 activity was assessed using the HDAC3 activity assay kit (Biovision, CA) as per the manufactures’ protocol. Absolute HDAC3 activity was calculated based on the slope determined by the standard deacetylated curve and expressed as pmol/min/mL.
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4

Enzymatic Assays for Metabolic Markers

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Lactate in serum or the culture medium was measured with colorimetric L-Lactate Assay Kit (Abcam, Cambridge, MA, USA, #ab65331) according to the manufacturer’s instructions. HDAC activity was measured with the fluorometric HDAC Activity Assay kit (Abcam, #ab156064) according to the manufacturer’s instructions. HIF1α DNA binding activity in nuclear extracts was measured with HIF1α Transcription Factor Assay Kit (Cayman, Ann Arbor, MI, USA, #10006910) according to the manufacturer’s instructions. PKM2 activity was measured by a lactate dehydrogenase-coupled enzyme assay27 (link),60 (link). The assay was carried out with 1 µg of cell lysates with an enzyme buffer (50 mM tris-HCl [pH 7.5], 100 mM KCl, 10 mM MgCl2, 0.9 mM adenosine diphosphate, 0.6 mM phosphoenolpyruvate, 0.12 mM β-nicotinamide adenine dinucleotide and 4.8 U ml−1 lactate dehydrogenase). Enzyme activity can be measured at 340 nm absorbance by spectrophotometry.
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5

Enzymatic Assays for Metabolic Markers

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Lactate in serum or the culture medium was measured with colorimetric L-Lactate Assay Kit (Abcam, Cambridge, MA, USA, #ab65331) according to the manufacturer’s instructions. HDAC activity was measured with the fluorometric HDAC Activity Assay kit (Abcam, #ab156064) according to the manufacturer’s instructions. HIF1α DNA binding activity in nuclear extracts was measured with HIF1α Transcription Factor Assay Kit (Cayman, Ann Arbor, MI, USA, #10006910) according to the manufacturer’s instructions. PKM2 activity was measured by a lactate dehydrogenase-coupled enzyme assay27 (link),60 (link). The assay was carried out with 1 µg of cell lysates with an enzyme buffer (50 mM tris-HCl [pH 7.5], 100 mM KCl, 10 mM MgCl2, 0.9 mM adenosine diphosphate, 0.6 mM phosphoenolpyruvate, 0.12 mM β-nicotinamide adenine dinucleotide and 4.8 U ml−1 lactate dehydrogenase). Enzyme activity can be measured at 340 nm absorbance by spectrophotometry.
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6

HDAC Activity Assay of HCT116 Nuclear Extract

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HDAC activity of HCT116 nuclear extract was assayed using the Fluorometric HDAC Activity Assay Kit from Abcam (ab156064) according to the manufacturer’s protocol. Briefly, nuclear extract was prepared by dounce homogenizing cell pellets in lysis buffer (10 mM Tris-HCl, 10 mM NaCl, 3 mM MgCl2, and pH 7.4), then spinning out nuclei and resuspending in nuclear extraction buffer (50 mM HEPES, 420 mM NaCl, 0.5 mM EDTA, 0.1 mM EGTA, 10% glycerol, and pH 7.5). Protein concentration was determined by Bradford, and then 50 µg was added to dose curves of butyrate, propionate, and their corresponding acyl-CoAs. TSA was used as a positive control. Fluorescence signal (Ex/Em=360/450 nm) was read on a plate reader at 2 min intervals for 1 hr. Values were averaged over two technical replicates. IC50 values were calculated using GraphPad Prism.
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7

Quantifying HDAC Activity in MM Cells

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The HDAC activity of MM cells was analyzed using the histone deacetylase (HDAC) Activity Assay Kit (Fluorometric) (Abcam, Cambridge, UK) according to the manufacturer’s instructions. Fluorescence intensity signals were measured using a fluorescence microplate reader (Ex/Em 355/460 nm).
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8

Evaluating HDAC and PARP1 Activity

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To assess HDACs and PARP1 activity, the day after plating, cells were exposed to MS-275 and harvested at different times. Histone Deacetylase (HDAC) Activity Assay Kit (Fluorometric) (ab156064) from abcam was used to test HDACs activity and PARP1 Enzyme Activity Assay (17-10149) was from Sigma-Aldrich (St. Louis, MO, USA) to test PARP1 activity. Assays were performed accordingly with the manufacturer’s instructions.
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9

HDAC Inhibition Assay in HCT116 Cells

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HCT116 cells were seeded in 10-cm dish and treated with indicated concentrations of compound 11 and SAHA for 24 h, and then cell lysates were subjected to a HDAC Fluorometric Activity Assay Kit (K330–100, Biovision Inc.) as described previously [32 (link)].
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10

HDAC Activity Assay for Anticancer Drugs

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Cells were plated in 10-cm dish (1×106 cells/ml) and treated with different doses of MPT0E028 and SAHA for 24 h, and then cell lysate was subjected to a HDAC Fluorometric Activity Assay Kit (K330-100, Biovision Inc.) to determine the HDAC activity. 50 μg of cell lysate was added to react with fluorometric substrate t-butoxycarbonyl-Lys (AC)-amido-4-methylcoumarin (Boc-Lys (AC) AMC) and incubated at 37°C for 30 minutes. After the incubation, the lysine developer in this kit was added and the mixture was incubated for another 30 min at 37°C. Fluorescence was detected by plate reader paradigm detection platform (Beckman coulter) with Ex=360 (excitation) and Em=465 nm (emission).
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