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6218S 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 (-) or SignalSilence® β-Arrestin 1 siRNA I (+) using β-Arrestin 2 (C16D9) Rabbit mAb #3857 (upper) or α-Tubulin (11H10) Rabbit mAb #2125 (lower). The β-Arrestin 2 (C16D9) Rabbit mAb confirms specificity of β-Arrestin 1 siRNA I, while the α-Tubulin (11H10) Rabbit mAb is used as a loading control.

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Western blot analysis of extracts from HeLa cells transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-) or SignalSilence® β-Arrestin 1 siRNA I (+) using β-Arrestin 1/2 (D24H9) XP® Rabbit mAb #4674 (upper) or α-Tubulin (11H10) Rabbit mAb #2125 (lower). The β-Arrestin 1/2 (D24H9) Rabbit mAb confirms silencing of β-Arrestin expression, while the α-Tubulin (11H10) Rabbit mAb is used to control for loading and specificity of β-Arrestin 1 siRNA.

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Product Usage Information

CST recommends transfection with 100 nM β-Arrestin 1 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® β-Arrestin 1 siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit β-arrestin 1 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.

Arrestin proteins function as negative regulators of G protein-coupled receptor (GPCR) signaling. Cognate ligand binding stimulates GPCR phosphorylation, which is followed by binding of arrestin to the phosphorylated GPCR and the eventual internalization of the receptor and desensitization of GPCR signaling (1). Four distinct mammalian arrestin proteins are known. Arrestin 1 (also known as S-arrestin) and arrestin 4 (X-arrestin) are localized to retinal rods and cones, respectively. Arrestin 2 (also known as β-arrestin 1) and arrestin 3 (β-arrestin 2) are ubiquitously expressed and bind to most GPCRs (2). β-arrestins function as adaptor and scaffold proteins and play important roles in other processes, such as recruiting c-Src family proteins to GPCRs in Erk activation pathways (3,4). β-arrestins are also involved in some receptor tyrosine kinase signaling pathways (5-8). Additional evidence suggests that β-arrestins translocate to the nucleus and help regulate transcription by binding transcriptional cofactors (9,10).


1.  Shenoy, S.K. and Lefkowitz, R.J. (2005) Sci STKE 2005, cm10.

2.  Lefkowitz, R.J. and Shenoy, S.K. (2005) Science 308, 512-7.

3.  Luttrell, L.M. et al. (1999) Science 283, 655-61.

4.  Luttrell, L.M. et al. (1999) Curr Opin Cell Biol 11, 177-83.

5.  Luttrell, L.M. and Lefkowitz, R.J. (2002) J Cell Sci 115, 455-65.

6.  Waters, C. et al. (2004) Semin Cell Dev Biol 15, 309-23.

7.  Lefkowitz, R.J. and Whalen, E.J. (2004) Curr Opin Cell Biol 16, 162-8.

8.  Waters, C.M. et al. (2005) Cell Signal 17, 263-77.

9.  Kang, J. et al. (2005) Cell 123, 833-47.

10.  Ma, L. and Pei, G. (2007) J Cell Sci 120, 213-8.


Entrez-Gene Id 408
Swiss-Prot Acc. P49407


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.