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6321S 300 µl (50-100 transfections)

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Fluorescent detection of SignalSilence® Control siRNA (Fluorescein Conjugate) #6201 in living HeLa cells 24 hours post-transfection, demonstrating nearly 100% transfection efficiency.

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Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Fluorescein Conjugate) #6201 (-), SignalSilence® Bax siRNA I (+) or SignalSilence® Bax siRNA II #6514 (+), using Bax Antibody #2772 and α-Tubulin (11H10) Rabbit mAb #2125. The Bax Antibody confirms silencing of Bax expression and α-Tubulin (11H10) Rabbit mAb is used to control for loading and specificity of Bax siRNA.

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Product Usage Information

CST recommends transfection with 100 nM Bax siRNA. Decreased Bax expression seen 24 hours post-transfection. See Protocol for transfection procedure.


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

Product Description

SignalSilence® Bax siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit Bax 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.


Bax is a key component for cellular induced apoptosis through mitochondrial stress (1). Upon apoptotic stimulation, Bax forms oligomers and translocates from the cytosol to the mitochondrial membrane (2). Through interactions with pore proteins on the mitochondrial membrane, Bax increases the membrane's permeability, which leads to the release of cytochrome c from mitochondria, activation of caspase-9 and initiation of the caspase activation pathway for apoptosis (3,4).


Bax expression was effectively reduced in T lymphocytes by RNA interference, demonstrating the dependence on Bax to trigger the release of AIF from the mitochondria during apoptosis (5).


1.  Wei, M.C. et al. (2001) Science 292, 727-730.

2.  Jürgensmeier, J.M. et al. (1998) Proc Natl Acad Sci U S A 95, 4997-5002.

3.  Narita, M. et al. (1998) Proc Natl Acad Sci U S A 95, 14681-6.

4.  Marzo, I. et al. (1998) Science 281, 2027-31.

5.  Bidere, N. et al. (2003) J. Biol. Chem. 278(33) , 31401-31411.


Entrez-Gene Id 581
Swiss-Prot Acc. Q07812


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.