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Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Fluorescein Conjugate) #6201 (-) or SignalSilence® mTOR siRNA II (+), using mTOR (7C10) Rabbit mAb #2983 and α-Tubulin (11H10) Rabbit mAb #2125. mTOR (7C10) Rabbit mAb confirms silencing of mTOR expression, while the α-Tubulin (11H10) Rabbit mAb is used to control for loading and specificity of mTOR siRNA.

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Product Usage Information

CST recommends transfection with 100 nM mTOR 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® mTOR siRNA II from Cell Signaling Technology allows the researcher to specifically inhibit mTOR 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 are rigorously tested in-house and have been shown to reduce target protein expression by western analysis.


The mammalian target of rapamycin (mTOR, FRAP, RAFT) is a Ser/Thr protein kinase (1-3) that functions as an ATP and amino acid sensor to balance nutrient availability and cell growth (4,5). When sufficient nutrients are available, mTOR responds to a phosphatidic acid-mediated signal to transmit a positive signal to p70 S6 kinase and participate in the inactivation of the eIF4E inhibitor, 4E-BP1 (6). These events result in the translation of specific mRNA subpopulations. mTOR is phosphorylated at Ser2448 via the PI3 kinase/Akt signaling pathway and autophosphorylated at Ser2481 (7,8). mTOR plays a key role in cell growth and homeostasis and may be abnormally regulated in tumors. For these reasons, mTOR is currently under investigation as a potential target for anti-cancer therapy (9).


1.  Sabers, C.J. et al. (1995) J Biol Chem 270, 815-22.

2.  Brown, E.J. et al. (1994) Nature 369, 756-8.

3.  Sabatini, D.M. et al. (1994) Cell 78, 35-43.

4.  Dennis, P.B. et al. (2001) Science 294, 1102-5.

5.  Gingras, A.C. et al. (2001) Genes Dev. 15, 807-826.

6.  Fang, Y. et al. (2001) Science 294, 1942-5.

7.  Peterson, R.T. et al. (2000) J Biol Chem 275, 7416-23.

8.  Huang, S. and Houghton, P.J. (2003) Curr Opin Pharmacol 3, 371-7.

9.  Navé, B.T. et al. (1999) Biochem J 344 Pt 2, 427-31.


Entrez-Gene Id 2475
Swiss-Prot Acc. P42345


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.