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Western blot analysis of extracts from Huh-7 cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® FGF Receptor 4 siRNA I (+), or SignalSilence® FGF Receptor 4 siRNA II #12669, using FGF Receptor 4 (D3B12) XP® Rabbit mAb #8562 (upper) or β-Actin (D6A8) Rabbit mAb #8457 (lower). The FGF Receptor 4 (D3B12) XP® Rabbit mAb confirms silencing of FGF Receptor 4 expression, while the β-Actin (D6A8) Rabbit mAb is used as a loading control.

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Order Details

Custom Ordering Details: This item is packaged to order. Please allow two to three days for your order to be processed and shipped.

Product Usage Information

CST recommends transfection with 100 nM SignalSilence® FGF Receptor 4 siRNA I 48 to 72 hours prior to cell lysis. For transfection procedure, follow protocol provided by the transfection reagent manufacturer. Please feel free to contact CST with any questions on use.

Each vial contains the equivalent of 100 transfections, which corresponds to a final siRNA concentration of 100 nM per transfection in a 24-well plate with a total volume of 300 μl per well.


Storage: SignalSilence® siRNA is supplied in RNAse-free water. Aliquot and store at -20ºC.

Product Description

SignalSilence® FGF Receptor 4 siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit FGF Receptor 4 expression using RNA interference, a method whereby gene expression can be selectively silenced through the delivery of double stranded RNA molecules into the cell. All SignalSilence® siRNA products from CST are rigorously tested in-house and have been shown to reduce target protein expression by western analysis.


Quality Control

Oligonucleotide synthesis is monitored base by base through trityl analysis to ensure appropriate coupling efficiency. The oligo is subsequently purified by affinity-solid phase extraction. The annealed RNA duplex is further analyzed by mass spectrometry to verify the exact composition of the duplex. Each lot is compared to the previous lot by mass spectrometry to ensure maximum lot-to-lot consistency.

Fibroblast growth factors (FGFs) produce mitogenic and angiogenic effects in target cells by signaling through cell surface receptor tyrosine kinases. There are four members of the FGF receptor family: FGFR1 (flg), FGFR2 (bek, KGFR), FGFR3, and FGFR4. Each receptor contains an extracellular ligand binding domain, a transmembrane domain, and a cytoplasmic kinase domain (1). Following ligand binding and dimerization, the receptors are phosphorylated at specific tyrosine residues (2). Seven tyrosine residues in the cytoplasmic tail of FGFR1 can be phosphorylated: Tyr463, 583, 585, 653, 654, 730, and 766. Tyr653 and Tyr654 are important for catalytic activity of activated FGFR and are essential for signaling (3). The other phosphorylated tyrosine residues may provide docking sites for downstream signaling components such as Crk and PLCγ (4,5).


1.  Powers, C.J. et al. (2000) Endocr Relat Cancer 7, 165-97.

2.  Reilly, J.F. et al. (2000) J Biol Chem 275, 7771-8.

3.  Mohammadi, M. et al. (1996) Mol Cell Biol 16, 977-89.

4.  Mohammadi, M. et al. (1991) Mol Cell Biol 11, 5068-78.

5.  Larsson, H. et al. (1999) J Biol Chem 274, 25726-34.


Entrez-Gene Id 2264
Swiss-Prot Acc. P22455


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
SignalSilence® is a trademark of Cell Signaling Technology, Inc.
XP® is a trademark of Cell Signaling Technology, Inc.