Catalog No.S1494

LY2228820 Chemical Structure

Molecular Weight(MW): 612.74

LY2228820 is a novel and potent inhibitor of p38 MAPK with IC50 of 7 nM in a cell-free assay, does not alter p38 MAPK activation. Phase 1/2.

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4 Customer Reviews

  • CD34 expression after 14 days of culture of CB CB CD34+ cells treated with the P38α inhibitor Ly2228820 or vehicle (DMSO; n=3). Error bars represent SEM.

    Blood 2012 119, 6255-8. LY2228820 purchased from Selleck.

    Cell cycle phase distributions were determined on U87EV and U87PTEN cell treated with B, +/- rapamycin and +/- LY2228820 as shown. Percent apoptotic cells as determined via annexin V staining is also shown below each graph. D were identical to B, except LN229MER-AKT and LN229EV cells induced with 4OHT were used.

    Mol Cancer Ther 2011 10, 2244-56. LY2228820 purchased from Selleck.

  • Relationship of JNK, p38 MAPK, and PI3K activation in TNF-α-induced signaling. Western blot analysis of the effect of another p38 MAPK inhibitor, LY2228820, on TNF-α signaling. HUVECs were pretreated with LY2228820 (10 umol/L) or wortmannin (1 umol/L) for 1 h, followed by stimulation with TNF-α (5 ng/mL) for 15 min (n=2).

    Acta Pharmacol Sin 2014 35, 339-50. LY2228820 purchased from Selleck.

    For MTT assays, cells (2,000 ~ 5,000 cells/well) were subcultured into 96-well plates according to their growth properties. Cell proliferation was assayed at 72 hr after treatment of LY2228820 by adding 20 μl of 5 mg/ml 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) solution per 100 μl of growth medium. After incubating for 3-4 h at 37°C, the media were removed and 150 µl/well of MTT solvent (either absolute DMSO or isopropanol containing 4 mM HCl and 0.1% Nonidet-40) was added to dissolve the formazan. The absorbance of each well was measured by ELx808 (BioTek, Winooski, VT) or Wallac Victor2 (Perkin-Elmer Life Sciences, Boston, MA) Microplate Reader. Viable cells are presented as percent of control, vehicle-treated cells.

    Dr. Yong-Weon Yi from Georgetown University Medical Center. LY2228820 purchased from Selleck.

Purity & Quality Control

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2. For more details, such as half maximal inhibitory concentrations (IC50s) and working concentrations of each inhibitor, please click on the link of the inhibitor of interest.
3. "+" indicates inhibitory effect. Increased inhibition is marked by a higher "+" designation.
4. Orange "√" refers to compounds which do inhibitory effects on the related isoform, but without specific value.

Biological Activity

Description LY2228820 is a novel and potent inhibitor of p38 MAPK with IC50 of 7 nM in a cell-free assay, does not alter p38 MAPK activation. Phase 1/2.
p38α [1]
(Cell-free assay)
7 nM
In vitro

LY2228820 inhibits p38α, as well as the level of phosphoMAPKAPK-2 (pMK2) in RAW 264.7 cells, with IC50 values of 7 nM and 34.3 nM, respectively. Furthermore, LY2228820 inhibits lipopolysaccharide (LPS)-induced TNFα formation in murine peritoneal macrophages, with IC50 of 5.2 nM. [1] In multiple myeloma (MM) cells, including INA6, RPMI-8226, U266, and RPMI-Dox40, LY2228820 (200 nM–800 nM) significantly blocks p38MAPK signaling, as revealed by its inhibition on phosphorylation of HSP27, a downstream target of p38MAPK, without affecting the expression level of HSP27. LY2228820 (200 nM–400 nM) enhances bortezomib-induced cytotoxicity and apoptosis, but LY2228820 alone doesn't inhibit the growth of MM.1S cells. LY2228820 (200 nM–800 nM) also inhibits secretion of IL-6 and MIP-1α in long-term BM stromal cells (LT-BMSCs), BM mononuclear cells (BMMNCs), peripheral blood (PB) CD138+, CD138 or PB CD14+ cells. LY2228820 (400 nM–800 nM) also blocks osteoclastogenesis from CD14+ cells. [2]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
RPMI-8226 NFnTcI5McW6jc3WgZZN{[Xl? MlHPglgxOCCwTR?= NFXGbIJFVVOR M{HWbolvcGmkaYTzJJBpd3OyaH;yfYxifGmxbjDv[kBJW1B{Nx?= MXSxPFM6PzN2NR?=
U266 NXXzfIxQU2mwYYPlJIF{e2G7 MVH+PFAxKG6P M2e3bGROW09? MoHBbY5pcWKrdIOgdIhwe3Cqb4L5cIF1cW:wIH;mJGhUWDJ5 M1PKWFE5Ozl5M{S1
MM.1S NELUeotMcW6jc3WgZZN{[Xl? NUXUepROhjhyMDDuUS=> M2XKSGROW09? M2naWIlvcGmkaYTzJJBpd3OyaH;yfYxifGmxbjDv[kBJW1B{Nx?= M33SVlE5Ozl5M{S1
RPMI-Dox40 NEf0OJFMcW6jc3WgZZN{[Xl? NYSxO4xihjhyMDDuUS=> M{K2bmROW09? M1ThcolvcGmkaYTzJJBpd3OyaH;yfYxifGmxbjDv[kBJW1B{Nx?= Ml;rNVg{QTd|NEW=
RPMI-LR5 NWezSYJzU2mwYYPlJIF{e2G7 NHfVZZF,QDByIH7N M1HkWmROW09? NHjodXhqdmirYnn0d{BxcG:|cHjvdplt[XSrb36gc4YhUFOSMke= NIXSNmkyQDN7N{O0OS=>
INA-6 M2raZmtqdmG|ZTDhd5NigQ>? NILCe2N,QDByIH7N M{HLNGROW09? M2HZ[YlvcGmkaYTzJJBpd3OyaH;yfYxifGmxbjDv[kBJW1B{Nx?= NXe5R441OTh|OUezOFU>
RPMI-8226 MlO4R5l1d3irY3n0fUBie3OjeR?= NX;COVRqhjFyMECgcm0> MWXEUXNQ NVn3WmR3dm9ic3nncolncWOjboSgZ5l1d3SxeHnjbZR6 M4rmclE5Ozl5M{S1
U266 NVLleWRKS3m2b4jpZ4l1gSCjc4PhfS=> NUfHRXRmhjFyMECgcm0> NHnVS49FVVOR Mnfaco8he2mpbnnmbYNidnRiY4n0c5RwgGmlaYT5 NWXJTmNyOTh|OUezOFU>
MM.1S NW\3d2F6S3m2b4jpZ4l1gSCjc4PhfS=> NXrrclZHhjFyMECgcm0> Ml3ISG1UVw>? Ml7oco8he2mpbnnmbYNidnRiY4n0c5RwgGmlaYT5 MoL6NVg{QTd|NEW=
RPMI-Dox40 NVTDVHptS3m2b4jpZ4l1gSCjc4PhfS=> NXW4RVB5hjFyMECgcm0> NVHGNWpvTE2VTx?= M4O2PI5wKHOrZ37p[olk[W62IHP5eI91d3irY3n0fS=> M4nHVVE5Ozl5M{S1
RPMI-LR5 NH3EZoNEgXSxeHnjbZR6KGG|c3H5 MlPsglExODBibl2= MV\EUXNQ M1vIeo5wKHOrZ37p[olk[W62IHP5eI91d3irY3n0fS=> MorwNVg{QTd|NEW=
INA-6 NXT0NoNMS3m2b4jpZ4l1gSCjc4PhfS=> MV;+NVAxOCCwTR?= MoXVSG1UVw>? M4rCSY5wKHOrZ37p[olk[W62IHP5eI91d3irY3n0fS=> M2DIRlE5Ozl5M{S1
CD14+ M1G0[mZ2dmO2aX;uJIF{e2G7 MnG1glgxOCCwTR?= NGPDXWtFVVOR NV:z[pEzcW6qaXLpeJMhd3O2ZX;jcIF{fG:pZX7ld4l{KG[{b32gR2QyPCCyb4PpeIl3\SClZXzsdy=> MkfxNVg{QTd|NEW=
U-87-MG M{jHZmZ2dmO2aX;uJIF{e2G7 NGfMVmgyKM7:TR?= MUDEUXNQ M1\iZZJm\HWlZYOgeJVud3JvZILpeoVvKGOxcnSg[o9zdWG2aX;u MWKyN|M{PTVyNh?=
MDA-MB-231 M4jJ[2Z2dmO2aX;uJIF{e2G7 M3XPN|Eh|ryP M4KxdWROW09? NWLtR4lDemWmdXPld{B1fW2xcj3kdol3\W5iY3;y[EBnd3KvYYTpc44> NUi4fJoyOjN|M{W1NFY>
A-2780 MVPGeY5kfGmxbjDhd5NigQ>? NXnyZY9ROSEQvF2= Ml7SSG1UVw>? MnPudoVlfWOnczD0eY1wei2mcnn2[Y4h[2:{ZDDmc5Ju[XSrb36= M3W5blI{OzN3NUC2
SK-OV-3 MXnGeY5kfGmxbjDhd5NigQ>? M2DORVEh|ryP MnfLSG1UVw>? MnjQdoVlfWOnczD0eY1wei2mcnn2[Y4h[2:{ZDDmc5Ju[XSrb36= MXiyN|M{PTVyNh?=
LXFA-629 M{j6fGZ2dmO2aX;uJIF{e2G7 MXGxJO69VQ>? M3ix[2ROW09? Mlq4doVlfWOnczD0eY1wei2mcnn2[Y4h[2:{ZDDmc5Ju[XSrb36= M33ZS|I{OzN3NUC2
NCI-H1650 MoO4SpVv[3Srb36gZZN{[Xl? MkTFNUDPxE1? NVrpbVdiTE2VTx?= MonTdoVlfWOnczD0eY1wei2mcnn2[Y4h[2:{ZDDmc5Ju[XSrb36= NV6yXlFXOjN|M{W1NFY>
PC-3 M1z3PGZ2dmO2aX;uJIF{e2G7 NILFcWkyKM7:TR?= MVPEUXNQ M{ewfZJm\HWlZYOgeJVud3JvZILpeoVvKGOxcnSg[o9zdWG2aX;u MnK4NlM{OzV3ME[=
RAW264.7 MVnGeY5kfGmxbjDhd5NigQ>? M2nic54zOCEQvF2= MYjEUXNQ Mn7vbY5pcWKrdIOgRY5qe2:veXPpck1{fGmvdXzheIVlKE2NMjDwbI9{eGixconsZZRqd25id3n0bEBKSzVyIH;mJFM2NjNibl2= NULMfWprOjR|NU[4NVQ>
mouse peritoneal macrophages NV3YWVNRTnWwY4Tpc44h[XO|YYm= MWH+NlAh|ryP MYPEUXNQ NXPOOYR{VFCVL1nGUk3Pu+LCk4P0bY12dGG2ZXSgWG5HNc7zIIDyc4R2[3Srb36ge4l1cCCLQ{WwJI9nKDZwMzDuUS=> M17DZVI1OzV4OEG0
A549 MUXGeY5kfGmxbjDhd5NigQ>? NYHzZYNvhjJyIN88US=> NIHTNo9FVVOR MVnpcohq[mm2czDMVHMucW6mdXPl[EBEYEOOODDwdo9lfWO2aX;uJJdqfGhiSVO1NEBw\iBzNESuPUBvVQ>? M3;1R|I1OzV4OEG0
MDA-231 NGHySVJHfW6ldHnvckBie3OjeR?= MnnyglExKM7:TR?= NVnkUZdke3WycILld5NmeyCGS1utNUBmgHC{ZYPzbY9v NViwbJpiOjZ2MEe4OFM>
MCF-7 M1vaOGZ2dmO2aX;uJIF{e2G7 NVTGPI1WhjFyIN88US=> NG\3SZB{fXCycnXzd4V{KESNSz2xJIV5eHKnc4Ppc44> NHGw[mczPjRyN{i0Ny=>
MDA-435 NF3pPYpHfW6ldHnvckBie3OjeR?= MYH+NVAh|ryP M2m0fpN2eHC{ZYPz[ZMhTEuNLUGg[ZhxemW|c3nvci=> NFrPNJAzPjRyN{i0Ny=>
PC3 MV;GeY5kfGmxbjDhd5NigQ>? MXn+NVAh|ryP M4XacWROW09? MmTtd5VxeHKnc4Pld{BFU0tvMTDlfJBz\XO|aX;u M{n5[FI3QTF|NkC4

... Click to View More Cell Line Experimental Data

In vivo In LPS-induced mice, LY2228820 effectively inhibits the formation of TNFα with a threshold minimum 50% effective dose (TMED50) less than 1 mg/kg. In a rat model of collagen-inducedarthritis (CIA), LY2228820 displays potent effects on paw swelling, bone erosion, and cartilage destruction, with a threshold minimum 50% effective dose (TMED50)of 1.5 mg/kg. [1]


Kinase Assay:[1]
+ Expand

Inhibition of p38α:

Inhibition of p38α is determined using recombinant human p38α in a standard filter binding protocol using ATP[γ-33P] and EGFR 21-mer peptide as substrate. Functional inhibition of TNFα in murine peritoneal macrophages is determined using LPS stimulation in the presence of LY2228820. To assess p38α activity in cells more directly, RAW 264.7 cells are treated with LY2228820 and then stimulated with anisomycin. The level of p38α activity is detected using a phosphoMAPKAPK-2 (pMK2) (Thr 334) antibody which reacts with a residue specifically phosphorylated by p38α.
Cell Research:[2, 3]
+ Expand
  • Cell lines: MM cells, including INA6, RPMI-8226, U266, and RPMI-Dox40
  • Concentrations: 200 nM–800 nM
  • Incubation Time: 48 hours
  • Method: MTT assays and APO 2.7 staining are performed to assess cellular proliferation and induction of apoptosis, respectively. Viability is expressed as percent viable cells. Apoptosis in cells is evaluated by APO 2.7 staining. For detection of mitochondrial membrane protein 7A6 expressed in apoptotic cells, cells are incubated with APO 2.7 reagent for 20 min. Expression of APO 2.7 is determined using an EPICS XL flow cytometer.
    (Only for Reference)
Animal Research:[1]
+ Expand
  • Animal Models: Lipopolysaccharide (LPS)-induced Balb/c mice
  • Formulation: Dissolved in 1% CMC/0.25% Tween 80 in water
  • Dosages: 0–20 mg/kg
  • Administration: Oral bid dosing for 14 days
    (Only for Reference)

Solubility (25°C)

In vitro Water 100 mg/mL warmed (163.2 mM)
DMSO 4 mg/mL warmed (6.52 mM)
Ethanol 3 mg/mL (4.89 mM)
In vivo Saline 30 mg/mL

* 1 mg/ml means slightly soluble or 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 612.74


CAS No. 862507-23-1
Storage powder
in solvent
Synonyms N/A

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Clinical Trial Information

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT02364206 Recruiting Adult Glioblastoma Centre Jean Perrin|National Cancer Institute, France|ARC Foundation for Cancer Research June 2015 Phase 1|Phase 2
NCT02322853 Recruiting Postmenopausal|Metastatic Breast Cancer Centre Francois Baclesse|National Cancer Institute, France|ARC Foundation for Cancer Research January 2015 Phase 2
NCT01663857 Active, not recruiting Epithelial Ovarian Cancer|Fallopian Tube Cancer|Primary Peritoneal Cancer Eli Lilly and Company July 2012 Phase 1|Phase 2
NCT01393990 Completed Advanced Cancer Eli Lilly and Company August 2008 Phase 1

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID