Abexinostat (PCI-24781)

Catalog No.S1090 Synonyms: CRA-024781

For research use only.

Abexinostat (PCI-24781, CRA-024781) is a novel pan-HDAC inhibitor mostly targeting HDAC1 with Ki of 7 nM, modest potent to HDACs 2, 3, 6, and 10 and greater than 40-fold selectivity against HDAC8. Phase 1/2.

Abexinostat (PCI-24781) Chemical Structure

CAS No. 783355-60-2

Selleck's Abexinostat (PCI-24781) has been cited by 20 publications

Purity & Quality Control

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Biological Activity

Description Abexinostat (PCI-24781, CRA-024781) is a novel pan-HDAC inhibitor mostly targeting HDAC1 with Ki of 7 nM, modest potent to HDACs 2, 3, 6, and 10 and greater than 40-fold selectivity against HDAC8. Phase 1/2.
Targets
HDAC1 [1]
(Cell-free assay)
HDAC3/SMRT [1] HDAC6 [1] HDAC2 [1]
(Cell-free assay)
HDAC10 [1] Click to View More Targets
7 nM(Ki) 8.2 nM(Ki) 17 nM(Ki) 19 nM(Ki) 24 nM
In vitro

PCI-24781 exhibits potent antitumor activity against a variety of tumor cell lines with GI50 ranging from 0.15 μM to 3.09 μM. PCI-24781 also has an antiproliferative effect on HUVEC endothelial cells with GI50 of 0.43 μM. PCI-24781 treatment 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. [1] 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, PCI-24781 treatment results in a decreased ability to perform homology directed repair of I-SceI-induced chromosome breaks in transfected CHO cells. [2] PCI-24781 induces S phase depletion, G2 cell cycle arrest, and apoptosis in soft tissue sarcoma (STS) cells. PCI-24781 induces Rad51 transcriptional repression in STS cells potentially mediated via enhanced E2F1 binding to the Rad51 proximal promoter. [3] PCI-24781 induces caspase and reactive oxygen species-dependent apoptosis through NF-κB mechanisms in Hodgkin lymphoma and non-Hodgkin lymphoma cell lines. [4]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
HeLa MVjGeY5kfGmxbjDhd5NigQ>? NInISVUzKGi{cx?= M1GwdmlvcGmkaYTpc44hd2ZiZInlMYxi[mWuZXSgeJJi[2W{IHLpcoRqdmdidH:gTGRCSzFyIDj1cotvd3ewIH;ybYdqdilidILhcpNn\WO2ZXSgbY4hcHWvYX6gTIVN[SClZXzsd{Bu\WG|dYLl[EBi\nSncjCyJIhzeyCkeTDuZY5wNWy3Y3nm[ZJie2VicnXwc5J1\XJiZ3Xu[U1j[XOnZDDCVmVVKGG|c3H5MEBKSzVyPUCuNFA4QTR|zszN NXOxcmg{RGFidHHy[4V1RSehYnzhcosoKGi{ZX[9K4h1fHC|Oj:vdJVjdWWmLn7jZokvdmyvLn7pbE5od3ZxM{C5OlQzQTBpPkOwPVY1OjlyPD;hQi=>
TC32 NWq3bGNneUiWUzDhd5NigQ>? MYLxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBRemmvYYL5JJNkemWnbjDmc5IhXEN|MjDj[Yxtew>? M1rWZVxiKHSjcnfleF0oZ2KuYX7rK{BpemWoPTfoeJRxezpxL4D1Zo1m\C6wY3LpMo5tdS6waXiu[493NzJ7NEO1NVM6Lz5{OUSzOVE{QTxxYU6=
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SK-N-MC NG\yWZpyUFSVIHHzd4F6 MYDxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBRemmvYYL5JJNkemWnbjDmc5IhW0tvTj3NR{Bk\Wyucx?= NF;GWYs9[SC2YYLn[ZQ:L1:kbHHub{chcHKnZk2nbJR1eHN8Lz;weYJu\WRwbnPibU5vdG1wbnnoModwfi9{OUSzOVE{QSd-Mkm0N|UyOzl:L3G+
BT-37 M4XiR5FJXFNiYYPzZZk> MXzxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBRemmvYYL5JJNkemWnbjDmc5IhSlRvM{egZ4VtdHN? MX68ZUB1[XKpZYS9K39jdGGwazegbJJm\j1paIT0dJM7Ny:ydXLt[YQvdmOkaT7ucI0vdmmqLnfvek8zQTR|NUGzPUc,Ojl2M{WxN|k9N2F-
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SK-N-SH MmnFdWhVWyCjc4PhfS=> MYHxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBRemmvYYL5JJNkemWnbjDmc5IhW0tvTj3TTEBk\Wyucx?= NHrSb3Y9[SC2YYLn[ZQ:L1:kbHHub{chcHKnZk2nbJR1eHN8Lz;weYJu\WRwbnPibU5vdG1wbnnoModwfi9{OUSzOVE{QSd-Mkm0N|UyOzl:L3G+
NB1643 NYrmd5hZeUiWUzDhd5NigQ>? MXvxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBRemmvYYL5JJNkemWnbjDmc5IhVkJzNkSzJINmdGy| MYC8ZUB1[XKpZYS9K39jdGGwazegbJJm\j1paIT0dJM7Ny:ydXLt[YQvdmOkaT7ucI0vdmmqLnfvek8zQTR|NUGzPUc,Ojl2M{WxN|k9N2F-
LAN-5 MXfxTHRUKGG|c3H5 NVTwW3lMeUiWUzDv[kBx\WSrYYTybYMh[2GwY3XyJINmdGxibHnu[ZMhfG9iaXTlcpRq\nlibYXseIlxdGVib4Dwc5J1fW6rdHnld{Bnd3JiZIL1[{Bz\XC3coDvd4lv\zpiUILpcYFzgSC|Y4Ll[Y4h\m:{IFzBUk02KGOnbHzz NVi4bGQ3RGFidHHy[4V1RSehYnzhcosoKGi{ZX[9K4h1fHC|Oj:vdJVjdWWmLn7jZokvdmyvLn7pbE5od3ZxMkm0N|UyOzlpPkK5OFM2OTN7PD;hQi=>
BT-12 NH63bndyUFSVIHHzd4F6 MVvxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBRemmvYYL5JJNkemWnbjDmc5IhSlRvMUKgZ4VtdHN? MoO5QIEhfGG{Z3X0QUdg[myjbnunJIhz\WZ;J3j0eJB{Qi9xcIXicYVlNm6lYnmucoxuNm6raD7nc5YwOjl2M{WxN|koRjJ7NEO1NVM6RC:jPh?=
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OHS-50 NYHrTWRieUiWUzDhd5NigQ>? Mmm4dWhVWyCxZjDw[YRq[XS{aXOgZ4Fv[2W{IHPlcIwhdGmwZYOgeI8hcWSnboTp[pkhdXWudHnwcIUhd3Cyb4L0eY5qfGmnczDmc5Ih\HK3ZzDy[ZB2enCxc3nu[|ohWHKrbXHyfUB{[3KnZX6g[o9zKE:KUz21NEBk\Wyucx?= MV[8ZUB1[XKpZYS9K39jdGGwazegbJJm\j1paIT0dJM7Ny:ydXLt[YQvdmOkaT7ucI0vdmmqLnfvek8zQTR|NUGzPUc,Ojl2M{WxN|k9N2F-
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MG 63 (6-TG R) MnnXdWhVWyCjc4PhfS=> MnHPdWhVWyCxZjDw[YRq[XS{aXOgZ4Fv[2W{IHPlcIwhdGmwZYOgeI8hcWSnboTp[pkhdXWudHnwcIUhd3Cyb4L0eY5qfGmnczDmc5Ih\HK3ZzDy[ZB2enCxc3nu[|ohWHKrbXHyfUB{[3KnZX6g[o9zKE2JIE[zJEg3NVSJIGKpJINmdGy| MWC8ZUB1[XKpZYS9K39jdGGwazegbJJm\j1paIT0dJM7Ny:ydXLt[YQvdmOkaT7ucI0vdmmqLnfvek8zQTR|NUGzPUc,Ojl2M{WxN|k9N2F-
Rh30 NIXucHpyUFSVIHHzd4F6 MlLrdWhVWyCxZjDw[YRq[XS{aXOgZ4Fv[2W{IHPlcIwhdGmwZYOgeI8hcWSnboTp[pkhdXWudHnwcIUhd3Cyb4L0eY5qfGmnczDmc5Ih\HK3ZzDy[ZB2enCxc3nu[|ohWHKrbXHyfUB{[3KnZX6g[o9zKFKqM{CgZ4VtdHN? MlfxQIEhfGG{Z3X0QUdg[myjbnunJIhz\WZ;J3j0eJB{Qi9xcIXicYVlNm6lYnmucoxuNm6raD7nc5YwOjl2M{WxN|koRjJ7NEO1NVM6RC:jPh?=
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NB1643 MU\xTHRUKGG|c3H5 M{Hoc5FJXFNib3[gdIVlcWG2cnnjJINidmOncjDj[YxtKGyrbnXzJJRwKGmmZX70bYZ6KG23bITpdIxmKG:ycH;yeJVvcXSrZYOg[o9zKGS{dXegdoVxfXKyb4Ppcoc7KEOxbn\pdo1ifG:{eTDzZ5Jm\W5iZn;yJG5DOTZ2MzDj[Yxtew>? NYTmNXNiRGFidHHy[4V1RSehYnzhcosoKGi{ZX[9K4h1fHC|Oj:vdJVjdWWmLn7jZokvdmyvLn7pbE5od3ZxMkm0N|UyOzlpPkK5OFM2OTN7PD;hQi=>
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BT-37 NGL1d41yUFSVIHHzd4F6 MlzMdWhVWyCxZjDw[YRq[XS{aXOgZ4Fv[2W{IHPlcIwhdGmwZYOgeI8hcWSnboTp[pkhdXWudHnwcIUhd3Cyb4L0eY5qfGmnczDmc5Ih\HK3ZzDy[ZB2enCxc3nu[|ohS2:wZnnycYF1d3K7IIPjdoVmdiCob4KgRnQuOzdiY3XscJM> NGT0fmo9[SC2YYLn[ZQ:L1:kbHHub{chcHKnZk2nbJR1eHN8Lz;weYJu\WRwbnPibU5vdG1wbnnoModwfi9{OUSzOVE{QSd-Mkm0N|UyOzl:L3G+
TC32 MlPhdWhVWyCjc4PhfS=> MYnxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBEd26oaYLtZZRwenlic3Py[YVvKG[xcjDUR|MzKGOnbHzz MkDRQIEhfGG{Z3X0QUdg[myjbnunJIhz\WZ;J3j0eJB{Qi9xcIXicYVlNm6lYnmucoxuNm6raD7nc5YwOjl2M{WxN|koRjJ7NEO1NVM6RC:jPh?=
MG 63 (6-TG R) NWXi[W0yeUiWUzDhd5NigQ>? MX;xTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBEd26oaYLtZZRwenlic3Py[YVvKG[xcjDNS{A3OyBqNj3US{BTMSClZXzsdy=> MoTmQIEhfGG{Z3X0QUdg[myjbnunJIhz\WZ;J3j0eJB{Qi9xcIXicYVlNm6lYnmucoxuNm6raD7nc5YwOjl2M{WxN|koRjJ7NEO1NVM6RC:jPh?=
U-2 OS MlnhdWhVWyCjc4PhfS=> NYHZemhmeUiWUzDv[kBx\WSrYYTybYMh[2GwY3XyJINmdGxibHnu[ZMhfG9iaXTlcpRq\nlibYXseIlxdGVib4Dwc5J1fW6rdHnld{Bnd3JiZIL1[{Bz\XC3coDvd4lv\zpiQ3;u[olzdWG2b4L5JJNkemWnbjDmc5IhXS1{IF;TJINmdGy| M4DzbVxiKHSjcnfleF0oZ2KuYX7rK{BpemWoPTfoeJRxezpxL4D1Zo1m\C6wY3LpMo5tdS6waXiu[493NzJ7NEO1NVM6Lz5{OUSzOVE{QTxxYU6=
Rh41 Mnr3dWhVWyCjc4PhfS=> MWjxTHRUKG:oIIDl[IlifHKrYzDjZY5k\XJiY3XscEBtcW6nczD0c{Bq\GWwdHnmfUBufWy2aYDs[UBweHCxcoT1col1cWW|IH\vdkBlenWpIILldJVzeG:|aX7nPkBEd26oaYLtZZRwenlic3Py[YVvKG[xcjDSbFQyKGOnbHzz M4rkW|xiKHSjcnfleF0oZ2KuYX7rK{BpemWoPTfoeJRxezpxL4D1Zo1m\C6wY3LpMo5tdS6waXiu[493NzJ7NEO1NVM6Lz5{OUSzOVE{QTxxYU6=
RD NWXie5RjeUiWUzDhd5NigQ>? NGnoc3ZyUFSVIH;mJJBm\GmjdILpZ{Bk[W6lZYKgZ4VtdCCuaX7ld{B1dyCrZHXueIlngSCvdXz0bZBt\SCxcIDvdpR2dmm2aXXzJIZweiCmcoXnJJJmeHW{cH;zbY5oQiCFb37mbZJu[XSxcomgd4Nz\WWwIH\vdkBTTCClZXzsdy=> Mo\0QIEhfGG{Z3X0QUdg[myjbnunJIhz\WZ;J3j0eJB{Qi9xcIXicYVlNm6lYnmucoxuNm6raD7nc5YwOjl2M{WxN|koRjJ7NEO1NVM6RC:jPh?=
Rh18 M1zrPJFJXFNiYYPzZZk> M17ZT5FJXFNib3[gdIVlcWG2cnnjJINidmOncjDj[YxtKGyrbnXzJJRwKGmmZX70bYZ6KG23bITpdIxmKG:ycH;yeJVvcXSrZYOg[o9zKGS{dXegdoVxfXKyb4Ppcoc7KEOxbn\pdo1ifG:{eTDzZ5Jm\W5iZn;yJHJpOThiY3XscJM> NEe4Sms9[SC2YYLn[ZQ:L1:kbHHub{chcHKnZk2nbJR1eHN8Lz;weYJu\WRwbnPibU5vdG1wbnnoModwfi9{OUSzOVE{QSd-Mkm0N|UyOzl:L3G+
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OHS-50 MV\xTHRUKGG|c3H5 M2rkZZFJXFNib3[gdIVlcWG2cnnjJINidmOncjDj[YxtKGyrbnXzJJRwKGmmZX70bYZ6KG23bITpdIxmKG:ycH;yeJVvcXSrZYOg[o9zKGS{dXegdoVxfXKyb4Ppcoc7KEOxbn\pdo1ifG:{eTDzZ5Jm\W5iZn;yJG9JWy13MDDj[Yxtew>? NVjt[2JwRGFidHHy[4V1RSehYnzhcosoKGi{ZX[9K4h1fHC|Oj:vdJVjdWWmLn7jZokvdmyvLn7pbE5od3ZxMkm0N|UyOzlpPkK5OFM2OTN7PD;hQi=>
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In vivo Administration of PCI-24781 at 200 mg/kg once daily every other day (q.o.d.) significantly inhibits the growth of HCT116 and DLD-1 xenografts in mice by 69% and 59%, respectively. Administration of PCI-24781 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) in the HCT116 model causes inhibition of tumor growth by 48%, 57%, 82.2%, or 80.0%, respectively. [1]

Protocol (from reference)

Kinase Assay:[1]
  • HDAC Activity:

    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 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 PCI-24781 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 Ki(app) are obtained using the program BatchKi.

Cell Research:[1]
  • Cell lines: HCT116, HCT-15, BT-549, NCI-H226, CWR-22RV1, MCF-7, NCI-PC3, DLD-1, SKOV-3, and OVCAR-3
  • Concentrations: Dissolved in DMSO, final concentrations ~10 μM
  • Incubation Time: 48, 72, 96, or 120 hours
  • Method: Cells are cultured for at least two doubling times, and growth is monitored at the end of PCI-24781 exposure using an Alamar blue fluorometric cell proliferation assay. PCI-24781 is assayed in triplicate wells in 96-well plates at nine concentrations using half-log intervals ranging from 0.0015 μM to 10 μM. The final DMSO concentration in each well is 0.15%. The concentration required to inhibit cell growth by 50% (GI50) and 95% confidence intervals are estimated from nonlinear regression using a four-parameter logistic equation.
  • (Only for Reference)
Animal Research:[1]
  • Animal Models: Female BALB/c nu/nu mice implanted s.c. with HCT116 and DLD-1 tumor cells
  • Dosages: ~200 mg/kg
  • Administration: Administered via i.v.
  • (Only for Reference)

Solubility (25°C)

In vitro

DMSO 80 mg/mL
(201.29 mM)
Water Insoluble
Ethanol Insoluble

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 397.42
Formula

C21H23N3O5

CAS No. 783355-60-2
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles CN(C)CC1=C(OC2=CC=CC=C21)C(=O)NCCOC3=CC=C(C=C3)C(=O)NO

In vivo Formulation Calculator (Clear solution)

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

mg/kg g μL

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO % % Tween 80 % ddH2O
%DMSO %

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.

Molarity Calculator

Mass Concentration Volume Molecular Weight

Clinical Trial Information

NCT Number Recruitment Interventions Conditions Sponsor/Collaborators Start Date Phases
NCT03934567 Recruiting Drug: Abexinostat Lymphoma Follicular Xynomic Pharmaceuticals Inc. April 22 2020 Phase 2
NCT03939182 Recruiting Drug: Abexinostat|Drug: Ibrutinib Diffuse Large B-cell Lymphoma|Mantle Cell Lymphoma Memorial Sloan Kettering Cancer Center|Janssen Scientific Affairs LLC|Xynomic Pharmaceuticals Inc. May 29 2019 Phase 1|Phase 2
NCT03600441 Active not recruiting Drug: Abexinostat Follicular Lymphoma Xynomic Pharmaceuticals Inc. August 27 2018 Phase 2
NCT01543763 Recruiting Drug: PZP115891 PCI-24781 Metastatic Solid Tumors Pamela Munster|Pharmacyclics LLC.|Novartis|Xynomic Pharmaceuticals Inc.|GlaxoSmithKline Research and Education Foundation for Cardiovascular Disease|University of California San Francisco June 25 2012 Phase 1
NCT01027910 Completed Drug: PCI-24781|Drug: Doxorubicin|Drug: GCSF Sarcoma Massachusetts General Hospital|Dana-Farber Cancer Institute|Brigham and Women''s Hospital|Pharmacyclics LLC. February 2009 Phase 1|Phase 2

(data from https://clinicaltrials.gov, updated on 2022-01-17)

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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