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LanthaScreen™ STAT3 GripTite™ Cell Line

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The JAK/STAT3 signaling pathway is known to be activated by cytokines such as IL-6. In this pathway, binding of IL-6 to its cell-surface receptors results in the activation of JAKs, which in turn phosphoactivate STAT3 proteins at a specific tyrosine residue (Y705). LanthaScreen® STAT3 GripTite™ is a human cell line that constitutively expresses a GFP-STAT3 fusion protein. The JAK/STAT signaling pathway is known to be functionally intact in this cell line; therefore, the GFP-STAT3 fusion protein serves as a substrate for IL-6-inducible phosphorylation. Using this cell line, a lytic immunoassay has been developed in which the phosphorylation state of GFP-STAT3 is detected in cell lysates using a terbium-labeled anti-pY705-STAT3 antibody in a time-resolved FRET (TR-FRET) readout.

The GFP-STAT3 DNA expression construct was transfected into the GripTite™ HEK 293 cell line using Lipofectamine™ 2000 transfection reagent, and the transfected cells were selected with blasticidin. This cell line is a clonal population isolated by flow cytometry using GFP fluorescence as a sorting marker. The assay utilizing this cell line is validated for EC50 and Z’-factors under optimized conditions using IL-6 as a ligand for JAK-mediated GFP-STAT3 phosphorylation. This assay has also been tested under variable experimental conditions, including cell plating density, stimulation time, DMSO tolerance, and assay equilibration time. An alternate "mix-and-read" assay format is also described.
For Research Use Only. Not for use in diagnostic procedures.


Gene Symbol: STAT3
Alternate Agonists: IL-6
Antagonists: IFN-alpha
Cell State: Dividing Cells
Druggable Target: Cytokines, Kinases
Primary Agonist: IL-6
Product Line: GripTite™, LanthaScreen®
Product Size: 1 vial
Readout: End Point
Reporter: GFP (EmGFP)
System: LanthaScreen®

Contents & storage

LanthaScreen® STAT3 GripTite™ cells are shipped on dry ice. Store in liquid nitrogen immediately upon receipt, or thaw for immediate use.


Manuals & protocols