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7595S 300 µl (3 nmol) $249.00
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REACTIVITY
H

Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® HDAC4 siRNA I (+) or SignalSilence® HDAC4 siRNA II #7609 (+), using HDAC4 (D15C3) Rabbit mAb #7628 (upper) or α-Tubulin (11H10) Rabbit mAb #2125 (lower). The HDAC4 (D15C3) Rabbit mAb confirms silencing of HDAC4 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 HDAC4 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® HDAC4 siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit HDAC4 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.

Acetylation of the histone tail causes chromatin to adopt an "open" conformation, allowing increased accessibility of transcription factors to DNA. The identification of histone acetyltransferases (HATs) and their large multiprotein complexes has yielded important insights into how these enzymes regulate transcription (1,2). HAT complexes interact with sequence-specific activator proteins to target specific genes. In addition to histones, HATs can acetylate nonhistone proteins, suggesting multiple roles for these enzymes (3). In contrast, histone deacetylation promotes a "closed" chromatin conformation and typically leads to repression of gene activity (4). Mammalian histone deacetylases can be divided into three classes on the basis of their similarity to various yeast deacetylases (5). Class I proteins (HDACs 1, 2, 3, and 8) are related to the yeast Rpd3-like proteins, those in class II (HDACs 4, 5, 6, 7, 9, and 10) are related to yeast Hda1-like proteins, and class III proteins are related to the yeast protein Sir2. Inhibitors of HDAC activity are now being explored as potential therapeutic cancer agents (6,7).


1.  Marmorstein, R. (2001) Cell Mol Life Sci 58, 693-703.

2.  Gregory, P.D. et al. (2001) Exp Cell Res 265, 195-202.

3.  Liu, Y. et al. (2000) Mol Cell Biol 20, 5540-53.

4.  Cress, W.D. and Seto, E. (2000) J Cell Physiol 184, 1-16.

5.  Gray, S.G. and Ekström, T.J. (2001) Exp Cell Res 262, 75-83.

6.  Thiagalingam, S. et al. (2003) Ann. N.Y. Acad. Sci. 983, 84-100.

7.  Vigushin, D.M. and Coombes, R.C. (2004) Curr Cancer Drug Targets 4, 205-18.


Entrez-Gene Id 9759
Swiss-Prot Acc. P56524


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.