Palbociclib (PD0332991) Isethionate

For research use only.

Licensed and Manufactured by Pfizer Catalog No.S1579

140 publications

Palbociclib (PD0332991) Isethionate Chemical Structure

CAS No. 827022-33-3

Palbociclib (PD0332991) Isethionate is a highly selective inhibitor of CDK4/6 with IC50 of 11 nM/16 nM in cell-free assays. It shows no activity against CDK1/2/5, EGFR, FGFR, PDGFR, InsR, etc. Phase 3.

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Selleck's Palbociclib (PD0332991) Isethionate has been cited by 140 publications

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Description Palbociclib (PD0332991) Isethionate is a highly selective inhibitor of CDK4/6 with IC50 of 11 nM/16 nM in cell-free assays. It shows no activity against CDK1/2/5, EGFR, FGFR, PDGFR, InsR, etc. Phase 3.
Features The 1st specific inhibitor for CDK4/6 to show promise in multiple cancers.
CDK4/CyclinD3 [1]
(Cell-free assay)
CDK4/CyclinD1 [1]
(Cell-free assay)
CDK6/CyclinD2 [1]
(Cell-free assay)
9 nM 11 nM 15 nM
In vitro

PD 0332991 exhibits absolute selectivity for CDK4/6 with little or no activity against other CDKs. PD 0332991 is effective at reducing Rb phosphorylation at Ser780 and Ser795 in MDA-MB-435 breast carcinoma cells with IC50 of 66 nM and 63 nM, respectively. PD 0332991 is a potent inhibitor of cell growth and suppresses DNA replication by preventing cells from entering S phase. PD 0332991 inhibits thymidine incorporation into the DNA of Rb-positive human breast (such as MDA-MB-435, MCF-7), colon (H1299), and lung carcinomas (Colo-205) as well as human leukemias (CRRF-CEM and K562), with IC50 values ranging from 0.04-0.17 μM. PD 0332991 significant increases the percentage of MDA-MB-453 in G1 period. [1] PD 0332991 inhibits phosphorylation of Rb in cycling CD138+ primary bone marrow myeloma cells, nontransformed primary B cells, MM1.S and CAG HMCLs cells line with IC50 of <0.1 μM, 0.05 μM, and 60-70 nM, respectively. PD 0332991 treatment also induces G1 arrest of CD138+ primary bone marrow myeloma and nontransformed primary B cells. PD 0332991 induces G1 arrest in MM1.S with IC50 of ~0.05 μM. [2] PD 0332991 preferentially inhibits proliferation of luminal estrogen receptor-positive (including HER2-positive) human breast cancer cell lines. PD 0332991 increases gene expression of pRb and cyclin D1 and decreases gene expression of CDKN2A (p16) in most sensitive lines. PD 0332991 enhances sensitivity to tamoxifen in cell lines with conditioned resistance to ER blockade. [3]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
H157 NYXDSmxET3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= MlziNE0yODBizszN M{jwVlczKGh? MVvJR|UxRTlizszN M33yfVI3OzlyM{Sy
H2170 M1Lub2dzd3e2aDDJcohq[mm2aX;uJGF{e2G7 MUewMVExOCEQvF2= NV\2OXI5PzJiaB?= NWfkUHBzUUN3ME21JO69VQ>? M{jycFI3OzlyM{Sy
H520 MmHiS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? Mn:3NE0yODBizszN NIXZNpU4OiCq M4fobmlEPTB;MD63N{DPxE1? M1nsU|I3OzlyM{Sy
H596 M3fLUGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NInldXcxNTFyMDFOwG0> MmfnO|IhcA>? M{PlZ2lEPTB;MUKg{txO NFjZenYzPjN7MEO0Ni=>
IMR-32 M{Xi[mdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 Mn;rOFjDqGh? M1;TPGROW09? MlfFTWM2OD1{NkGgcm0> Mle1NlYzOjVzMkO=
SH-SY5Y Mn3tS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? Mle0OFjDqGh? NYW2UHJrTE2VTx?= Mlf5TWM2OD14N{[gcm0> NUDlcpB2OjZ{MkWxNlM>
NGP Mn\5S5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? M3nOV|Q5yqCq NIHMWIpFVVOR MnXjTWM2OD1{LkC3O{DPxE1? NV;OO2pYOjZ{MkWxNlM>
IMR-32 M33CXGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NG\QVYsyKM7:TR?= NVHZ[JV5OjRiaB?= MYjEUXNQ MmXSbY5lfWOnczDHNUBienKnc4S= M3zzZVI3OjJ3MUKz
NGP MmKyS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? MoLnNUDPxE1? NHXrbpozPCCq MlXaSG1UVw>? NWLWfI1UcW6mdXPld{BIOSCjcoLld5Q> NUXLelh5OjZ{MkWxNlM>
SH-EP M4rMV2dzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NUnY[5B3OSEQvF2= MWCyOEBp M3TZbmROW09? NVv0NlROcW6mdXPld{BIOSCjcoLld5Q> NHS4WWQzPjJ{NUGyNy=>
U-CH3 MX;Hdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? M2rYdVAuOSEQvF2= NG\XUJU4OiCq MXvJR|UxRTV{IH7N MkO3NlYyQDN7MkW=
U-CH6 NX[1WYpWT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= MV[wMVEh|ryP NWfyR5l4PzJiaB?= M{TrW2lEPTB;OUCgcm0> MoK5NlYyQDN7MkW=
U-CH7 NVfXfHU6T3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= NGG0[nAxNTFizszN NHu5SJk4OiCq MYHJR|UxRTl6IH7N MV6yOlE5Ozl{NR?=
U-CH11 NV\HbWk5T3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= NHLUWlYxNTFizszN MV[3NkBp NX31VVB5UUN3ME2zOFAhdk1? MVqyOlE5Ozl{NR?=
MCF7 NV;ycJVqTnWldHnvckBCe3OjeR?= MXKyMlUuOjVyIH7N MYqyOEBp NWfw[YxEemWmdXPld{BT[iCyaH;zdIhwenmuYYTpc44> MUSyOVk6OThzNx?=
MV4-11 MlnmRZBweHSxc3nzJGF{e2G7 NVXCNIVsOC53IN88US=> NGG3OJgzPCCq Mnra[Y5p[W6lZYOgZZBweHSxc3nzJIlv\HWlZXSgZpkhe2:{YX\lcoljKGGwZDDBR|IzOA>? MX:yOVQ5PzlzNx?=
MOLM13 NFjucXZCeG:ydH;zbZMhSXO|YYm= NVHhdldOOC53IN88US=> NXnZSFU6OjRiaB?= NGH6bXlmdmijbnPld{BieG:ydH;zbZMhcW6mdXPl[EBjgSC|b4Lh[oVvcWJiYX7kJGFEOjJy M2HZVFI2PDh5OUG3
MOLM13-ITD/D835Y NYrqboFOT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= Ml7rTWM2OD1yLkGxOEDDuSByLkCxNUDPxE1? MYGyOVQ5PzlzNx?=
MV4-11-ITD/D835V NH7BepJIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= M1LGVmlEPTB;MD6xNVYhyrFiMD6wNVEh|ryP MmG5NlU1QDd7MUe=
MV4-11-ITD/D835V MWLHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? NH7mU4NKSzVyPUCuNVAzKMLzIECuNFA3KM7:TR?= NFPFW5czPTR6N{mxOy=>
MV4-11-ITD/N841K M2j2SGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NFjaS2RKSzVyPUCuNVE{KMLzIECuNFAzKM7:TR?= NEDuNVczPTR6N{mxOy=>

... Click to View More Cell Line Experimental Data

Methods Test Index PMID
Western blot
RB1 (pT821) / RB1 (pS780); 

PubMed: 30300583     

Immunoblots showing dose-dependent impact of 72 hr palbociclib treatment on indicated protein levels in Kasumi-1 and SKNO-1 cells.

pAMPKα(T172) / AMPKα; 

PubMed: 28453226     

Dose-dependent response of palbociclib on AMPK‐related molecules. HCC cells were treated with different concentrations of palbociclib for 24 h. The phosphorylation of the indicated proteins was determined by western blotting. 

pULK1(S317) / ULK1; 

PubMed: 28453226     

Dose-dependent response of palbociclib on AMPK‐related molecules. HCC cells were treated with different concentrations of palbociclib for 24 h. The phosphorylation of the indicated proteins was determined by western blotting. 

c-Jun / p-c-Jun / NFκB(p50); 

PubMed: 26540629     

The expression of c-Jun and phosphorylated c-Jun was assessed using western blot after the cells were treated with palbociclib. 

p38 / p-P38 / JNK / p-JNK; 

PubMed: 26540629     

MAPK pathway-related proteins, p38, ERK, JNK expression levels were detected.

30300583 28453226 26540629
Growth inhibition assay
Cell viability; 

PubMed: 28453226     

Dose- and time-dependent effects of palbociclib on cell viability in three HCC cell lines. Hep3B, Huh7, and PLC5 cells were treated with palbociclib at the indicated concentrations for 24 or 48 h and assayed by MTT. The solvent (DMSO) concentration in each sample is equal (0.7%).


PubMed: 27099147     

Dose-response curve of ITD+ (red) or control (black) leukemic cells with CDK4/6 inhibitor palbociclib. Cells were incubated with increasing concentrations for 72 hours. Cell viability and proliferation were assessed by using the CTG assay. IC50 values were calculated by using GraphPad Prism software. Error bars indicate ± SEM.

28453226 27099147

PubMed: 29669860     

Representative maximum‐intensity projections of MCF7 cells treated with the 1 μM palbociclib and/or 7.5 nM bortezomib. Note that 7.5 nM bortezomib inhibits proteasome only partially. Fixed and permeabilized cells were stained with Alexa Fluor 488‐conjugated Ki67 antibody, Alexa Fluor 647‐conjugated phospho‐Histone H2A.X (γH2AX) (pSer139) antibody, and DAPI. All images were acquired with the same magnification, and scale bar is 20 μm.


PubMed: 28453226     

LC3B immunofluorescence in palbociclib‐treated Hep3B cells. Arrowheads indicate LC3‐positive autophagosomes. Nuclei were counterstained with DAPI (blue). 

29669860 28453226

PubMed: 26540629     

The supernatant of control and 7.5 μM palbociclib-treated cells was collected and stored at −80°C. PGE2 secretion was detected using ELISA.

In vivo PD 0332991(150 mg/kg) produces rapid Colo-205 colon carcinoma xenografts regressions and a corresponding tumor growth delay. PD 0332991 (150 mg/kg) induces complete tumor stasis and cell kill in MDA-MB-435 breast carcinoma. PD 0332991 (150 mg/kg) also induces significant tumor regression in mice bearing the SF-295 glioblastoma xenografts, and in ZR-75-1 breast and PC-3 prostate tumor models (complete suppression of tumor growth). PD 0332991 (150 mg/kg) suppresses Rb Ser780 phosphorylation in MDA-MB-435 breast carcinoma over the full 24-hour period. PD 0332991 (150 mg/kg) down-regulates expression of four E2F-regulated genes CDC2, CCNE2, TK1, and TOP2A in Colo-205 carcinoma xenografts. [1] PD 0332991 also rapidly inhibits myeloma tumor growth. [2]


Kinase Assay:[4]
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CDK activity assays:

CDK assays for IC50 determinations and kinetic evaluation are performed in 96-well filter plates. All CDK-cyclin kinase complexes are expressed in insect cells through baculovirus infection and purified. The substrate for the assays is a fragment (amino acids 792–928) of pRb fused to GST (GST•RB-Cterm). The total reaction volume is 0.1 mL containing a final concentration of 20 mM Tris-HCl, pH 7.4, 50 mM NaCl, 1 mM dithiothreitol, 10 mM MgCl2 25 μM ATP (for CDK4-cyclin D1, CDK6-cyclin D2, and CDK6-cyclin D3) containing 0.25 μCi of [γ-32P]ATP, 20 ng of enzyme, 1 μg of GST•RB-Cterm, and appropriate dilutions of inhibitor. All components except the [γ-32P]ATP are added to the wells, and placed on a plate mixer for 2 min. The reaction is started by adding the [γ-32P]ATP, and incubated at 25℃ for 15 min. The reaction is terminated by addition of 0.1 mL of 20% trichloroacetic acid, and the plate is kept at 4 ℃ for at least 1 hr to allow the substrate to precipitate. The wells are then washed five times with 0.2 mL of 10% trichloroacetic acid, and radioactive incorporation is determined with a β plate counter.
Cell Research:[3]
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  • Cell lines: Human breast cancer cells MDA-MB-435
  • Concentrations: 2 μM
  • Incubation Time: 6 days
  • Method: Cells are seeded in duplicate at 5,000 to 10,000 cells per well in 24-well plates. The day after plating, different concentrations of PD 0332991 are added. Control wells without drug are also seeded. At the end of incubation, cells are trypsinizated and placed in Isotone solution and counted immediately using a Coulter Z2 particle counter.
    (Only for Reference)
Animal Research:[1]
- Collapse
  • Animal Models: Human colon carcinoma xenografts Colo-205
  • Dosages: 150 mg/kg
  • Administration: o.p. injection every day
    (Only for Reference)

Solubility (25°C)

In vitro Water 10 mg/mL warmed (17.43 mM)
DMSO Insoluble
Ethanol Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
saline (with warming)
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 573.66


CAS No. 827022-33-3
Storage powder
in solvent
Synonyms N/A
Smiles CC1=C(C(=O)N(C2=NC(=NC=C12)NC3=NC=C(C=C3)N4CCNCC4)C5CCCC5)C(=O)C.C(CS(=O)(=O)O)O

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT04483505 Not yet recruiting Drug: Combination Rogaratinib + palbociclib + fulvestrant Breast Cancer Metastatic|Hormone Receptor Positive Malignant Neoplasm of Breast Fundacion CRIS de Investigación para Vencer el Cáncer|Bayer|Pfizer|Apices Soluciones S.L. October 1 2020 Phase 1
NCT04360941 Recruiting Drug: Palbociclib|Drug: Avelumab Triple Negative Breast Cancer|Locally Advanced Breast Cancer|Recurrent Breast Cancer|Metastatic Breast Cancer|ER+ Breast Cancer|HER2-positive Breast Cancer Royal Marsden NHS Foundation Trust|Pfizer|Breast Cancer Now August 11 2020 Phase 1
NCT03870919 Suspended Drug: Palbociclib|Other: locoregional treatment Breast Cancer Stage IV|Radiotherapy|Surgery UNICANCER|Pfizer October 23 2019 Not Applicable

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  • Question 1:

    What is the best vehicle for palbociclib for in vitro and in vivo?

  • Answer:

    You can use water for vitro use and Saline for vivo use.

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID