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6582S 300 µl (3 nmol) $249.00
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Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® Stat3 siRNA I #6580 (+) or SignalSilence® Stat3 siRNA II (+), using Stat3 (79D7) Rabbit mAb #4904 and α-Tubulin (11H10) Rabbit mAb #2125. The Stat3 (79D7) Rabbit mAb confirms silencing of Stat3 expression, while the α-Tubulin (11H10) Rabbit mAb is used to control for loading and specificity of Stat3 siRNA.

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Product Usage Information

CST recommends transfection with 100 nM Stat3 siRNA II 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® Stat3 siRNA II from Cell Signaling Technology (CST) allows the researcher to specifically inhibit Stat3 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.

The Stat3 transcription factor is an important signaling molecule for many cytokines and growth factor receptors (1) and is required for murine fetal development (2). Research studies have shown that Stat3 is constitutively activated in a number of human tumors (3,4) and possesses oncogenic potential (5) and anti-apoptotic activities (3). Stat3 is activated by phosphorylation at Tyr705, which induces dimerization, nuclear translocation, and DNA binding (6,7). Transcriptional activation seems to be regulated by phosphorylation at Ser727 through the MAPK or mTOR pathways (8,9). Stat3 isoform expression appears to reflect biological function as the relative expression levels of Stat3α (86 kDa) and Stat3β (79 kDa) depend on cell type, ligand exposure, or cell maturation stage (10). It is notable that Stat3β lacks the serine phosphorylation site within the carboxy-terminal transcriptional activation domain (8).


1.  Heim, M.H. (2001) J Recept Signal Transduct Res 19, 75-120.

2.  Takeda, K. et al. (1997) Proc Natl Acad Sci U S A 94, 3801-4.

3.  Catlett-Falcone, R. et al. (1999) Immunity 10, 105-15.

4.  Garcia, R. and Jove, R. (1998) J Biomed Sci 5, 79-85.

5.  Bromberg, J.F. et al. (1999) Cell 98, 295-303.

6.  Darnell, J.E. et al. (1994) Science 264, 1415-21.

7.  Ihle, J.N. (1995) Nature 377, 591-4.

8.  Wen, Z. et al. (1995) Cell 82, 241-50.

9.  Yokogami, K. et al. (2000) Curr Biol 10, 47-50.

10.  Biethahn, S. et al. (1999) Exp Hematol 27, 885-94.


Entrez-Gene Id 6774
Swiss-Prot Acc. P40763


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.
Limited Use Label License, RNA interference: This product is licensed under European Patent 1144623 and foreign equivalents from Ribopharma AG, Kulmbach, Germany and is provided only for use in non-commercial research specifically excluding use (a) in drug discovery or drug development, including target identification or target validation, by or on behalf of a commercial entity, (b) for contract research or commercial screening services, (c) for the production or manufacture of siRNA-related products for sale, or (d) for the generation of commercial databases for sale to Third Parties. Information about licenses for these and other commercial uses is available from Ribopharma AG, Fritz-Hornschuch-Str. 9, D-95326 Kulmbach, Germany.