Name: Abexinostat (PCI-24781)
Brand: Selleck Chemicals
SKU: S1090
Availability: InStock
Rating: 5 (25 reviews)

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Quality Control

Batch: Purity: 99.21%

99.21

Related Targets	Akt Wnt/beta-catenin PKC HSP ROCK Microtubule Associated Integrin Bcr-Abl Actin FAK
Other HDAC Inhibitors	ITF-2357 (Givinostat) Hydrochloride Monohydrate Fimepinostat (CUDC-907) Trichostatin A (TSA) Entinostat (MS-275) RGFP966 Quisinostat (JNJ-26481585) Dihydrochloride Tubastatin A Hydrochloride Tubastatin A Mocetinostat (MGCD0103) Ricolinostat (ACY-1215)

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Incubation Time	Activity Description	PMID
HeLa	Function assay	2 hrs	Inhibition of dye-labeled tracer binding to HDAC10 (unknown origin) transfected in human HeLa cells measured after 2 hrs by nano-luciferase reporter gene-based BRET assay, IC50=0.007943μM	30964290
TC32	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for TC32 cells	29435139
DAOY	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for DAOY cells	29435139
SJ-GBM2	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells	29435139
A673	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells	29435139
SK-N-MC	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells	29435139
BT-37	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-37 cells	29435139
NB-EBc1	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells	29435139
U-2 OS	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for U-2 OS cells	29435139
Saos-2	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Saos-2 cells	29435139
SK-N-SH	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-SH cells	29435139
NB1643	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB1643 cells	29435139
LAN-5	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for LAN-5 cells	29435139
BT-12	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-12 cells	29435139
Rh18	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh18 cells	29435139
OHS-50	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells	29435139
RD	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for RD cells	29435139
MG 63 (6-TG R)	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for MG 63 (6-TG R) cells	29435139
Rh30	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh30 cells	29435139
Rh41	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh41 cells	29435139
NB1643	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for NB1643 cells	29435139
A673	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for A673 cells)	29435139
SK-N-MC	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SK-N-MC cells	29435139
BT-12	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for BT-12 cells	29435139
LAN-5	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for LAN-5 cells	29435139
DAOY	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for DAOY cells	29435139
NB-EBc1	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for NB-EBc1 cells	29435139
SJ-GBM2	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SJ-GBM2 cells	29435139
BT-37	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for BT-37 cells	29435139
TC32	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for TC32 cells	29435139
MG 63 (6-TG R)	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for MG 63 (6-TG R) cells	29435139
U-2 OS	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for U-2 OS cells	29435139
Rh41	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh41 cells	29435139
RD	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for RD cells	29435139
Rh18	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh18 cells	29435139
Rh30	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Rh30 cells	29435139
Saos-2	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for Saos-2 cells	29435139
OHS-50	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for OHS-50 cells	29435139
SK-N-SH	qHTS assay		qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Confirmatory screen for SK-N-SH cells	29435139
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 80 mg/mL (201.29 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.250mg/ml (0.63mM)	Taking the 1 mL working solution as an example, add 50 μL of 5 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.250mg/ml (0.63mM)	Taking the 1 mL working solution as an example, add 50 μL of 5 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

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% DMSO

%

% Tween 80

% ddH₂O

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Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	397.42	Formula	C₂₁H₂₃N₃O₅	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	783355-60-2	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	CRA-024781			SMILES	CN(C)CC1=C(OC2=CC=CC=C21)C(=O)NCCOC3=CC=C(C=C3)C(=O)NO

Read more about storage stability stock solution CAS number SMILES

Mechanism of Action

Targets/IC₅₀/Ki	HDAC1 (Cell-free assay) 7 nM(Ki) HDAC3/SMRT 8.2 nM(Ki) HDAC6 17 nM(Ki) HDAC2 (Cell-free assay) 19 nM(Ki) HDAC10 24 nM HDAC8 280 nM
In vitro	Abexinostat (PCI-24781) exhibits potent antitumor activity against a variety of tumor cell lines with GI50 ranging from 0.15 μM to 3.09 μM, and also has an antiproliferative effect on HUVEC endothelial cells with GI50 of 0.43 μM. Treatment with this compound causes dose-dependent accumulation of both acetylated histones and acetylated tubulin in HCT116 or DLD-1 cells, induces expression of p21, and leads to PARP cleavage and accumulation of the γH2AX. Inhibition of HDAC enzymes by PCI-24781 leads to a significant reduction in the transcription of genes specifically associated with HR, including RAD51. Consistent with inhibition of HR, it results in a decreased ability to perform homology directed repair of I-SceI-induced chromosome breaks in transfected CHO cells. It induces S phase depletion, G2 cell cycle arrest, and apoptosis in soft tissue sarcoma (STS) cells, and also causes Rad51 transcriptional repression in STS cells potentially mediated via enhanced E2F1 binding to the Rad51 proximal promoter. Additionally, this compound induces caspase and reactive oxygen species-dependent apoptosis through NF-κB mechanisms in Hodgkin lymphoma and non-Hodgkin lymphoma cell lines.
Kinase Assay	HDAC Activity
Kinase Assay	HDAC activity is measured using a continuous trypsin-coupled assay. For inhibitor characterization, measurements are done in a reaction volume of 100 μL using 96-well assay plates. For each isozyme, the HDAC protein in reaction buffer [50 mM HEPES, 100 mM KCl, 0.001% Tween 20, 5% DMSO (pH 7.4), supplemented with bovine serum albumin at concentrations of 0% (HDAC1), 0.01% (HDAC2, 3, 8, and 10), or 0.05% (HDAC6)] is mixed with Abexinostat (PCI-24781) at various concentrations and allowed to incubate for 15 minutes. Trypsin is added to a final concentration of 50 nM, and acetyl-Gly-Ala-(N-acetyl-Lys)-AMC is added to a final concentration of 25 μM (HDAC1, 3, and 6), 50 μM (HDAC2 and 10), or 100 μM (HDAC8) to initiate the reaction. Negative control reactions are done in the absence of this compound in replicates of eight. Reactions are monitored in a fluorescence plate reader. After a 30-minute lag time, the fluorescence is measured over a 30-minute time frame using an excitation wavelength of 355 nm and a detection wavelength of 460 nm. The increase in fluorescence with time is used as the measure of the reaction rate. Inhibition constants K_i(app) are obtained using the program BatchKi.
In vivo	Abexinostat (PCI-24781) was administered at 200 mg/kg once daily every other day (q.o.d.), which significantly inhibited the growth of HCT116 and DLD-1 xenografts in mice by 69% and 59%, respectively. In the HCT116 model, administration of this compound at 20 mg/kg, 40 mg/kg, 80 mg/kg, or 160 mg/kg once daily for 4 consecutive days followed by 3 days without treatment each week (q.d. × 4 per week) caused inhibition of tumor growth by 48%, 57%, 82.2%, or 80.0%, respectively.
References	[1] https://pubmed.ncbi.nlm.nih.gov/16731764/ [2] https://pubmed.ncbi.nlm.nih.gov/18042714/ [3] https://pubmed.ncbi.nlm.nih.gov/19417021/ [4] https://pubmed.ncbi.nlm.nih.gov/19417023/

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2025-04-10)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT03600441	ACTIVE_NOT_RECRUITING	Follicular Lymphoma	Xynomic Pharmaceuticals, Inc.	2018-08-27	PHASE2
NCT05698524	RECRUITING	Recurrent High Grade Glioma; Anaplastic Astrocytoma; Anaplastic Oligodendroglioma; Glioblastoma; Gliosarcoma	University of Nebraska	2023-06-26	PHASE1
NCT03592472	RECRUITING	Renal Cell Carcinoma	Xynomic Pharmaceuticals, Inc.	2018-07-17	PHASE3
NCT03936153	RECRUITING	Diffuse Large B-cell Lymphoma (DLBCL)	Xynomic Pharmaceuticals, Inc.	2020-01-20	PHASE2
NCT04498520	WITHDRAWN	Anatomic Stage III Breast Cancer AJCC v8; Anatomic Stage IIIA Breast Cancer AJCC v8; Anatomic Stage IIIB Breast Cancer AJCC v8; Anatomic Stage IIIC Breast Cancer AJCC v8; Anatomic Stage IV Breast Cancer AJCC v8; Hormone Receptor Positive Breast Carcinoma; Locally Advanced Breast Carcinoma; Metastatic Breast Carcinoma; Metastatic Endometrioid Adenocarcinoma; Metastatic Fallopian Tube Carcinoma; Metastatic HER2 Negative Breast Carcinoma; Metastatic Malignant Solid Neoplasm; Metastatic Ovarian Carcinoma; Metastatic Primary Peritoneal Carcinoma; Prognostic Stage III Breast Cancer AJCC v8; Prognostic Stage IIIA Breast Cancer AJCC v8; Prognostic Stage IIIB Breast Cancer AJCC v8; Prognostic Stage IIIC Breast Cancer AJCC v8; Prognostic Stage IV Breast Cancer AJCC v8; Recurrent Fallopian Tube Carcinoma; Recurrent Ovarian Carcinoma; Recurrent Primary Peritoneal Carcinoma; Refractory Breast Carcinoma; Stage IV Fallopian Tube Cancer AJCC v8; Stage IV Ovarian Cancer AJCC v8; Stage IV Primary Peritoneal Cancer AJCC v8; Stage IV Uterine Corpus Cancer AJCC v8; Stage IVA Fallopian Tube Cancer AJCC v8; Stage IVA Ovarian Cancer AJCC v8; Stage IVA Primary Peritoneal Cancer AJCC v8; Stage IVA Uterine Corpus Cancer AJCC v8; Stage IVB Fallopian Tube Cancer AJCC v8; Stage IVB Ovarian Cancer AJCC v8; Stage IVB Primary Peritoneal Cancer AJCC v8; Stage IVB Uterine Corpus Cancer AJCC v8	Pamela Munster	2021-03-31	PHASE1
NCT03939182	COMPLETED	Diffuse Large B-cell Lymphoma; Mantle Cell Lymphoma	Memorial Sloan Kettering Cancer Center	2019-05-29	PHASE1

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Abexinostat (PCI-24781) HDAC inhibitor

Chemical Structure

Molecular Weight: 397.42