For research use only.

Catalog No.S1422 Synonyms: NS 41080

13 publications

Droxinostat Chemical Structure

CAS No. 99873-43-5

Droxinostat (NS 41080) is a selective inhibitor of HDAC, mostly for HDACs 6 and 8 with IC50 of 2.47 μM and 1.46 μM, greater than 8-fold selective against HDAC3 and no inhibition to HDAC1, 2, 4, 5, 7, 9, and 10.

Selleck's Droxinostat has been cited by 13 publications

2 Customer Reviews

  • Chemical inhibition of HDAC3, -6, and -8 with the selective HDAC inhibitor Droxinostat (2 uM) resulted in a significant increase in the percent of 2D10 cells expressing GFP in cells that had been depleted of HDAC3 but not HDAC1 or -2. (*p<0.05).

    PLoS One 2014 9(8), e102684. Droxinostat purchased from Selleck.

  • Breast cancer cells line T47D were treated with the indicated concentrations of Droxinostat.



    Dr. Zhang of Tianjin Medical University. Droxinostat purchased from Selleck.

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Choose Selective HDAC Inhibitors

Biological Activity

Description Droxinostat (NS 41080) is a selective inhibitor of HDAC, mostly for HDACs 6 and 8 with IC50 of 2.47 μM and 1.46 μM, greater than 8-fold selective against HDAC3 and no inhibition to HDAC1, 2, 4, 5, 7, 9, and 10.
Features Selective inhibitor of HDAC3, HDAC6,and HDAC8.
HDAC8 [3] HDAC6 [3] HDAC3 [3] HDAC9 [3] HDAC10 [3]
1.46 μM 2.47 μM 16.9 μM >20 μM >20 μM
In vitro

Droxinostat is originally identified as a sensitizer of PPC-1 cells to FAS and TRAIL by downregulating the expression of c-Fas-associated death domain-like interleukin-1-converting enzyme-like inhibitory protein (c-FLIP). [1] In PPC-1 cells cultured in suspension but not adherent conditions, Droxinostat (20 μM–60 μM) sensitizes cells to anoikis by initially activating caspase 8 with subsequent activation of the mitochondrial pathway. Similarly, Droxinostat also sensitizes other cancer cell lines including PC-3, DU-145, T47D, and OVCAR-3, but not LNCaP or MB-MDA-468, to anoikis or CH-11-induced apoptosis. [2] However, the direct targets of Droxinostat remains enigma until recently. It is revealed that in histone deacetylases (HDAC) isoform 1-10, Droxinostat selective inhibits HDAC3, 6, and 8, with IC50 values of 16.9 μM, 2.47 μM, and 1.46 μM, respectively, without inhibiting other HDAC members (IC50 > 20 μM). [3] In MCF-7 breast cancer cells, Droxinostat (10 μM–100 μM) sensitizes cells to apoptosis by decreasing c-FLIPL and c-FLIPS expression, reducing cell survival, and inducing apoptosis. [4]

In vivo In SCID mice models, Droxinostat (30 μM)-treated PPC-1 cells results in decreased distant tumor formation than untreated cells. [2]


Kinase Assay:[3]
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HDAC Inhibition Assay:

HDAC inhibition is assessed using the CycLex HDACs fluorometric assay according to the manufacturer's protocol and using crude nuclear extract from HeLa cells (principally HDAC1 and HDAC2). The relative activity is expressed as (fluorescence intensity of treated samples/fluorescence intensity of controls) × 100
Cell Research:[1]
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  • Cell lines: PPC-1 cells
  • Concentrations: 0–100 μM, dissolved in DMSO (final concentration of DMSO is 0.5%)
  • Incubation Time: 24 hours
  • Method: PPC-1 cells (1 × 104) are seeded overnight into 96-well flat-bottomed plates in 100 μL of medium containing 2.5% FCS. The next day, Droxinostat is added. CH-11 antibody (100 ng/mL) is then added and the cells are incubated for 24 hours before assessing cell viability by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) dye reduction assay.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 49 mg/mL (201.07 mM)
Ethanol 49 mg/mL (201.07 mM)
Water Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
30% propylene glycol, 5% Tween 80, 65% D5W
For best results, use promptly after mixing.
30 mg/mL

* 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 243.69


CAS No. 99873-43-5
Storage powder
in solvent
Synonyms NS 41080
Smiles CC1=C(C=CC(=C1)Cl)OCCCC(=O)NO

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HDAC Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID