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To Purchase # 6486S

6486S 300 µl (3 nmol) $249.00
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Western blot analysis of extracts from OVCAR8 cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-) or SignalSilence® Bak siRNA I (+), using Bak (D2D3) Rabbit mAb #6947 (upper) or α-Tubulin (11H10) Rabbit mAb #2125 (lower). The Bak (D2D3) Rabbit mAb confirms silencing of Bak expression, while the α-Tubulin (11H10) Rabbit mAb is used as a loading control.

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Product Usage Information

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

Bak is a proapoptotic member of the Bcl-2 family (1). This protein is located on the outer membrane of mitochondria and is an essential component for transduction of apoptotic signals through the mitochondrial pathway (2,3). Upon apoptotic stimulation, an upstream stimulator like truncated BID (tBID) induces conformational changes in Bak to form oligomer channels in the mitochondrial membrane for cytochrome c release. The release of cytochrome c to the cytosol activates the caspase-9 pathway and eventually leads to cell death (4,5).


1.  Gross, A. et al. (1999) Genes Dev. 13, 1899-1911.

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

3.  Zong, W.X. et al. (2001) Genes Dev. 15, 1481-1486.

4.  Degenhardt, K. et al. (2002) J. Biol. Chem. 277, 14127-14134.

5.  Wei, M.C. et al. (2000) Genes Dev. 14, 2060-2071.


Entrez-Gene Id 578
Swiss-Prot Acc. Q16611


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.