Ricolinostat (ACY-1215)

For research use only.

Catalog No.S8001 Synonyms: Rocilinostat

42 publications

Ricolinostat (ACY-1215)  Chemical Structure

CAS No. 1316214-52-4

Ricolinostat (ACY-1215, Rocilinostat) is a selective HDAC6 inhibitor with IC50 of 5 nM in a cell-free assay. It is >10-fold more selective for HDAC6 than HDAC1/2/3 (class I HDACs) with slight activity against HDAC8, minimal activity against HDAC4/5/7/9/11, Sirtuin1, and Sirtuin2. Ricolinostat (ACY-1215) suppresses cell proliferation and promotes apoptosis. Phase 2.

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Selleck's Ricolinostat (ACY-1215) has been cited by 42 publications

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Biological Activity

Description Ricolinostat (ACY-1215, Rocilinostat) is a selective HDAC6 inhibitor with IC50 of 5 nM in a cell-free assay. It is >10-fold more selective for HDAC6 than HDAC1/2/3 (class I HDACs) with slight activity against HDAC8, minimal activity against HDAC4/5/7/9/11, Sirtuin1, and Sirtuin2. Ricolinostat (ACY-1215) suppresses cell proliferation and promotes apoptosis. Phase 2.
Features Induced less cytotoxicity in PHA-stimulated PBMCs from 4 healthy donors compared with the pan-HDAC inhibitor SAHA.
HDAC6 [1]
(Cell-free assay)
HDAC2 [1]
(Cell-free assay)
HDAC3 [1]
(Cell-free assay)
HDAC1 [1]
(Cell-free assay)
HDAC8 [1]
(Cell-free assay)
4.7 nM 48 nM 51 nM 58 nM 100 nM
In vitro

ACY-1215 is a hydroxamic acid derivative. ACY-1215 is 12-, 10-, and 11-fold less active against HDAC1, HDAC2, and HDAC3 (class I HDACs), respectively. ACY-1215 has minimal activity (IC50 > 1μM) against HDAC4, HDAC5, HDAC7, HDAC9, HDAC11, Sirtuin1, and Sirtuin2, and has slight activity against HDAC8 (IC50 = 0.1μM). The IC50 values for ACY-1215 for T-cell toxicity is 2.5μM. ACY-1215 overcomes tumor cell growth and survival conferred by BMSCs and cytokines in the BM milieu. ACY-1215 in combination with bortezomib induces synergistic anti-MM activity. ACY-1215 induces potent acetylation of α-tubulin at very low doses and triggers acetylation of lysine on histone H3 and histone H4 only at higher doses, confirming its specific inhibitory effect on HDAC6 activity. [1]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
RPMI8226 M1TCd2dzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NXzU[JF{UUN3ME2xOFY5KMLzIEOxNEBvVQ>? M2L5NlI3PDR|MEe4
A-172 MVTHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? NHnxV3UyOMLibl2= NV[zdY5IOjRxNEigbC=> NGKzPWdqdmirYnn0d{Bk\WyuIHfyc5d1cCC2aX3lJIRmeGWwZHXueIx6 Mm\DNlYyPTB|NEC=
U87MG NGjrZopIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= M3\vTFExyqCwTR?= MXWyOE81QCCq NUPtUm9IcW6qaXLpeJMh[2WubDDndo94fGhidHnt[UBl\XCnbnTlcpRtgQ>? M2nKSVI3OTVyM{Sw
Hbl-1 M{XFNmdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 MYC0PEBp NWLBU3RlUUN3ME2xMlYh|ryP NWDaXpZjOjZzMU[yO|A>
OCI-Ly10 MmTtS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? NE\6O2U1QCCq M{DRfmlEPTB;MD65JO69VQ>? M1uyNlI3OTF4Mkew
Riva MUfHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? MmXTOFghcA>? NITye5pKSzVyPUKuNkDPxE1? MUWyOlEyPjJ5MB?=
Su-DHL2 M2rlV2dzd3e2aDDJcohq[mm2aX;uJGF{e2G7 M3PTU|Q5KGh? NV3zXoxSUUN3ME2zMlMh|ryP Mli1NlYyOTZ{N{C=
OCI-Ly1 Mo\oS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? MUi0PEBp MXrJR|UxRTJwNDFOwG0> MWqyOlEyPjJ5MB?=
OCI-Ly7 NYnme2ZVT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= M3;ybVQ5KGh? NWG1To1uUUN3ME2xMlIh|ryP MkDVNlYyOTZ{N{C=
Su-DHL4 NVzqdIRUT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= NVnUflBNPDhiaB?= MkfoTWM2OD12Lkeg{txO MYKyOlEyPjJ5MB?=
Su-DHL6 MlG1S5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? NFLsWpY1QCCq Mof6TWM2OD1|LkKg{txO NG\tSpEzPjFzNkK3NC=>
Hbl-2 Mn;wS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? MnHMOFghcA>? MYfJR|UxRTFwOTFOwG0> M3nyV|I3OTF4Mkew
Jeko-1 M3XLZWdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 MYW0PEBp MnG5TWM2OD1zLkWg{txO NVe0NlBsOjZzMU[yO|A>
Jvm-2 MXHHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? NIrEPFI1QCCq NX7tV|lWUUN3ME20MlAh|ryP NFLzbWMzPjFzNkK3NC=>
Rec-1  MYfHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? MmWwOFghcA>? M3SxXWlEPTB;Mj6zJO69VQ>? NFL3bnQzPjFzNkK3NC=>
CCL-119 MX3Hdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? NXzoU4RiPDhiaB?= NVvVWZh2UUN3ME2xMlch|ryP NI\EZYYzPjFzNkK3NC=>
H9 M3vySGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NInvNGs1QCCq NXTUeI1rUUN3ME2xMlIh|ryP MmK1NlYyOTZ{N{C=
HH M2jzNGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 M{D1N|Q5KGh? MUXJR|UxRTJwNTFOwG0> MUeyOlEyPjJ5MB?=
Sup-T1 MXzHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? M2H5NVQ5KGh? NF;C[YNKSzVyPUGuOkDPxE1? NUOxW4t3OjZzMU[yO|A>
MM.1S Mn;kSpVv[3Srb36gRZN{[Xl? MkHBNE02|ryP MlvzOkBp MVjpcoNz\WG|ZYOgZYNmfHmuYYTl[EDPuS22dXL1cIlv NHvV[YYzOjJ4Mke2NC=>
MM.1S M3PHPGZ2dmO2aX;uJGF{e2G7 M2j6NVAvOjVxMd88US=> NEPSOXUyQCCq NWnh[GdocW6lcnXhd4V{KGGlZYT5cIF1\WRizsGteJVjfWyrbh?= NIHOWIYzOjJ4Mke2NC=>
MM.1R MYTGeY5kfGmxbjDBd5NigQ>? M4XQ[|AvOjVxMd88US=> Mn[yNVghcA>? NIjxZpVqdmO{ZXHz[ZMh[WOndInsZZRm\CEQsT30eYJ2dGmw M1zkeVIzOjZ{N{[w
RPMI8226  NGnGOYpHfW6ldHnvckBCe3OjeR?= NFzzcHAxNjJ3L{JOwG0> NIPON5YyQCCq MoPSbY5kemWjc3XzJIFk\XS7bHH0[YQh|rFvdIXieYxqdg>? M2HGUFIzOjZ{N{[w
MM.1S MUDD[YxtKF[rYXLpcIl1gSCDc4PhfS=> NGnqblAxNTkQvF2= M4HsZlQ5KGh? MlKx[IVkemWjc3XzJG1ONWOnbHygeoli[mmuaYT5JIlvKGFiZH;z[U1l\XCnbnTlcpQhdWGwbnXy NHz5Z28zOjJ4Mke2NC=>
OPM1 M376OGNmdGxiVnnhZoltcXS7IFHzd4F6 NGfKPXcxNTkQvF2= NEfLRXE1QCCq NE\lUG9l\WO{ZXHz[ZMhVU1vY3XscEB3cWGkaXzpeJkhcW5iYTDkc5NmNWSncHXu[IVvfCCvYX7u[ZI> MknSNlIzPjJ5NkC=
RPMI NHnJfm1E\WyuIG\pZYJqdGm2eTDBd5NigQ>? NXfhWJZiOC16zszN MXi0PEBp MnvM[IVkemWjc3XzJG1ONWOnbHygeoli[mmuaYT5JIlvKGFiZH;z[U1l\XCnbnTlcpQhdWGwbnXy MlnpNlIzPjJ5NkC=
MM.1R M3P4XGNmdGxiVnnhZoltcXS7IFHzd4F6 M1jXPFAuQM7:TR?= NWfTZ2FwPDhiaB?= NX7UWlQ5\GWlcnXhd4V{KE2PLXPlcIwhfmmjYnnsbZR6KGmwIHGg[I9{\S2mZYDlcoRmdnRibXHucoVz NVjqWVBNOjJ{NkK3OlA>
LR5 MUnD[YxtKF[rYXLpcIl1gSCDc4PhfS=> NWO4XHJuOC16zszN NFPKflg1QCCq NXXZcW5O\GWlcnXhd4V{KE2PLXPlcIwhfmmjYnnsbZR6KGmwIHGg[I9{\S2mZYDlcoRmdnRibXHucoVz MWWyNlI3Ojd4MB?=
OPM2 MWfD[YxtKF[rYXLpcIl1gSCDc4PhfS=> NEDXRpQxNTkQvF2= NWjXOHN3PDhiaB?= Mk[w[IVkemWjc3XzJG1ONWOnbHygeoli[mmuaYT5JIlvKGFiZH;z[U1l\XCnbnTlcpQhdWGwbnXy Mn7xNlIzPjJ5NkC=

... Click to View More Cell Line Experimental Data

Methods Test Index PMID
Western blot
Ac-α-tubulin / Ac-Histone H4 ; 

PubMed: 31015208     

Ricolinostat promotes the accumulation of acetylated (Ac) α-tubulin. MM cells were treated with the indicated concentrations of ricolinostat for 24 hours. Protein expression was measured by immunoblotting. 

Survivin / P21 / CDC2 / p53 / p-p53(S392) / Cyclin A2 / Cyclin B1; 

PubMed: 30050135     

Western blot analysis of G2/M phase cell cycle regulatory-proteins for 48 h

Bax / Bim / Bcl2 / Cleaved caspase-3 / Cleaved caspase-9 / Cleaved PARP; 

PubMed: 30050135     

Western blot analysis of apoptosis regulatory-proteins for 48 h

PI3K(p85) / AKT / p-AKT(S473) / PRAS40 / Rag C / mTOR / p-mTOR / ERK / p-ERK; 

PubMed: 30050135     

ACY-1215 treatment inhibited PI3K/AKT/mTOR and ERK signaling protein levels in ESCC EC109 and TE-1 cell lines for 48 h.

Ac-β-catenin(K49) / p-β-catenin / β-catenin; 

PubMed: 25546293     

Time-course immunoblot analysis of human NPCs treated with an HDAC6 inhibitor. Human NPCs were treated with HDAC6 inhibitor ACY-1215 at 5 μM for the times points indicated and the lysates immunoblotted with antibodies against β-catenin, Ac-Lys49-β-catenin, phos-Ser45 and phos-Ser33, Ser37, and Thr41. β-actin is using shown as loading control.

31015208 30050135 25546293
β-tubulin / β-catenin; 

PubMed: 25546293     

Immunofluorescence staining for β-catenin treated with HDAC6 inhibitor in human NPCs. Cells were treated with 5 μM ACY-1215 or DMSO for 18 h and imaged with anti-β-catenin antibody (green), anti-β-tubulin antibody (red), and Hoechst 33342 (blue). Scale bar, 20 μm.  Quantification of β-catenin levels at the membrane represent two independent experiments with three fields of view each at 20× magnification. Error bars indicate standard deviation. ** and **** denote significance at p < 0.01 and p < 0.0001, respectively (unpaired t test).

Growth inhibition assay
Cell viability; 

PubMed: 31015208     

Ricolinostat decreases MM cell viability. A panel of MM cell lines was treated with the indicated concentrations of ricolinostat for 72 hours. Cell viability was measured by MTT assay.

In vivo ACY-1215 in combination with bortezomib triggered more significant anti-MM activity than either agent alone in suppressing tumor growth and prolonging survival in both plasmacytoma model and disseminated MM model without significant adverse effects. ACY-1215 is readily absorbed by tumor tissue. Moreover, the drug does not accumulate in tumor tissue, as evidenced by the parallel decline of acetylated α-tubulin in blood cells and tumor tissue by 24 hours after dose. [1]


Kinase Assay:


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HDAC enzymatic assays:

ACY-1215 is dissolved and subsequently diluted in assay buffer [50 mM HEPES, pH 7.4, 100 mM KCl, 0.001% Tween-20, 0.05% BSA, and 20 μM tris(2-carboxyethyl)phosphine] to 6-fold the final concentration. HDAC enzymes are diluted to 1.5-fold of the final concentration in assay buffer and pre-incubated with ACY-1215 for 10 minutes before the addition of the substrate. The amount of FTS (HDAC1, HDAC2, HDAC3, and HDAC6) or MAZ-1675 (HDAC4, HDAC5, HDAC7, HDAC8, and HDAC9) used for each enzyme is equal to the Michaelis constant (Km), as determined by a titration curve. FTS or MAZ-1675 is diluted in assay buffer to 6-fold the final concentration with 0.3μM sequencing grade trypsin. The substrate/trypsin mix is added to the enzyme/compound mix and the plate is shaken for 60 seconds and then placed into a SpectraMax M5 microtiter plate reader. The enzymatic reaction is monitored for release of 7-amino-4-methoxy-coumarin over 30 minutes, after deacetylation of the lysine side chain in the peptide substrate, and the linear rate of the reaction is calculated.
Cell Research:


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  • Cell lines: MM cell lines, patient MM cells, and PBMCs
  • Concentrations: ~8 μM
  • Incubation Time: 48 hours
  • Method:

    PBMCs from healthy donors are isolated and stimulated with 2.5 μg/mL of phytohemagglutinin (PHA) for 48 hours in the presence of increasing concentrations of ACY-1215. DNA synthesis is measured by tritiated thymidine uptake. CD4+T cells are purified from human blood with the Rosette Sep negative-selection kit. Cells are stimulated by CD3/CD28 Dynabeads for 7 days in the presence of compounds. Cell viability is assessed using alamarBlue. MM cells (2-3 × 104cells/well) are incubated in 96-well culture plates with medium and different concentrations of ACY-1215, bortezomib, and/or recombinant IL-6 (10 ng/mL) or insulin-like growth factor-1 (IGF-1; 50 ng/mL) for 24 hours at 37°C, and tritiated thymidine incorporation is measured.

    (Only for Reference)
Animal Research:


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  • Animal Models: MM xenograft SCID mouse model
  • Dosages: 50 mg/kg
  • Administration: ip
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 86 mg/mL (198.38 mM)
Water Insoluble
Ethanol Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
2% DMSO+30% PEG 300+ddH2O
For best results, use promptly after mixing.

* 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 433.5


CAS No. 1316214-52-4
Storage powder
in solvent
Synonyms Rocilinostat
Smiles C1=CC=C(C=C1)N(C2=CC=CC=C2)C3=NC=C(C=N3)C(=O)NCCCCCCC(=O)NO

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Frequently Asked Questions

  • Question 1:

    What would you suggest to obtain a clear solution?

  • Answer:

    S8001 ACY-1215 can be dissolved in 2% DMSO/30% PEG 300/ddH2O at 5 mg/ml clearly while it in 1% DMSO/30% polyethylene glycol/1% Tween 80 at 30 mg/ml is a suspension for oral administration. Please note that the precipitation will go out from the clear solution after stayed for about half an hour, So it is recommended to prepare the solution just before use.

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID