For research use only.

Catalog No.S7259

8 publications

FLLL32 Chemical Structure

CAS No. 1226895-15-3

FLLL32 is a potent JAK2/STAT3 inhibitor with IC50 of <5 μM. FLLL32 inhibits the induction of STAT3 phosphorylation by IFNα and IL-6 in breast cancer cells.

Selleck's FLLL32 has been cited by 8 publications

2 Customer Reviews

  • Interleukin-6 (IL-6) secretion was inhibited by B7‐H4 silence through JAK2/signal transducer and activator of transcription 3 (STAT3) inactivation. (a) ELISA results showed that, compared with cells pretreated with control shRNA, B7‐H4 silence led to reduction of IL‐6 secretion. However, compared with cells pretreated with control shRNA and FLLL32, IL‐6 secretion in Eca109, TE1, and TE13 esophageal squamous cell carcinoma cells pretreated with B7‐H4 shRNA and FLLL32 was not significantly affected.

    Cancer Sci, 2016, 107(7):944-54. . FLLL32 purchased from Selleck.

    Flow cytometry detection of cell proliferation.

    Eur Rev Med Pharmacol Sci, 2017, 21(13):3005-3011. FLLL32 purchased from Selleck.

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Biological Activity

Description FLLL32 is a potent JAK2/STAT3 inhibitor with IC50 of <5 μM. FLLL32 inhibits the induction of STAT3 phosphorylation by IFNα and IL-6 in breast cancer cells.
JAK2 [1]
<5 μM
In vitro

In MDA-MB-231 breast and PANC-1 pancreatic cancer cells, FLLL32 downregulates STAT3 phosphorylation and DNA-binding activity. In MDA-MB-231 cells, FLLL32 inhibit the formation of colonies and cell invasion. [1] In human multiple myeloma, glioblastoma, liver cancer, and colorectal cancer cell lines, FLLL32 also leads to the inhibition of cell proliferation and the induction of caspase-3 and PARP cleavages. [2]

In vivo In MDA-MB-231 xenografted mice, FLLL32 (50 mg/kg, i.p.) significantly reduces tumor burdens. [1] In mouse xenografts with OS-33 osteosarcoma cells, FLLL32 (50 mg/kg, i.p.) also inhibits tumor growth by targeting STAT3. [3]


Kinase Assay:[1]
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JAK2 and other human kinase activity assays:

JAK2 kinase activity was assessed with the HTScan JAK2 Kinase Assay Kit per manufacturer's protocol. The possible effects of FLLL32 on the other 10 purified human protein kinases were determined by using a Kinase Profiler Assay.
Cell Research:[1]
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  • Cell lines: MDA-MB-231 cell line
  • Concentrations: ~5 μM
  • Incubation Time: 72 hours
  • Method: Cells are seeded in 96-well plates (3,000 per well) in triplicate and then treated with 0.5 to 5 μM of FLLL31 or FLLL32 or with 0.5 to 30 μM of curcumin for 72 h. MTT (25 μL) is added to each sample and incubated for 3.5 h. Then, 100 μL of N,N-dimethylformamide solubilization solution are added to each well. The absorbance at 450 nm is read the following day. IC50 are determined using Sigma Plot 9.0 software.
    (Only for Reference)
Animal Research:[1]
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  • Animal Models: MDA-MB-231 xenografted mice
  • Dosages: 50 mg/kg, daily
  • Administration: i.p.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 92 mg/mL (198.04 mM)
Water Insoluble
Ethanol '25 mg/mL warmed

* 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 464.55


CAS No. 1226895-15-3
Storage powder
in solvent
Synonyms N/A
Smiles COC1=C(C=C(C=C1)C=CC(=O)C2(CCCCC2)C(=O)C=CC3=CC(=C(C=C3)OC)OC)OC

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JAK Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID