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Western blot analysis of extracts from HeLa cells transfected with 100 nM SignalSilence® Control siRNA (Fluorescein Conjugate) #6201 (-) or HSP27 siRNA I (+), using HSP27 (G31) Mouse mAb #2402 and p44/42 MAPK (Erk1/2) (3A7) Mouse mAb #9107. The HSP27 (G31) mAb confirms silencing of HSP27 expression and p44/42 MAPK mAb is used to control for loading and specificity of HSP27 siRNA.

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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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Product Usage Information

CST recommends transfection with 100nM HSP27 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.


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

Product Description

SignalSilence® HSP27 siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit HSP27 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.


Heat shock protein (HSP) 27 is one of the small HSPs that are constitutively expressed at different levels in various cell types and tissues. Like other small HSPs, HSP27 is regulated at both the transcriptional and posttranslational levels (1). In response to stress, the HSP27 expression increases several-fold to confer cellular resistance to the adverse environmental change. HSP27 is phosphorylated at Ser15, Ser78, and Ser82 by MAPKAPK-2 as a result of the activation of the p38 MAP kinase pathway (2,3). Phosphorylation of HSP27 causes a change in its tertiary structure, which shifts from large homotypic multimers to dimers and monomers (4). It has been shown that phosphorylation and increased concentration of HSP27 modulates actin polymerization and reorganization (5,6).


Small interfering RNA (siRNA) has been used to specifically silence HSP27 expression in HeLa cells (7).


1.  Arrigo, A.P. and Landry, J. (1994) Cold Spring Harbor Laboratory Press, NY, 335-373.

2.  Landry, J. et al. (1992) J. Biol. Chem. 267, 794-803.

3.  Rouse, J. et al. (1994) Cell 78, 1027-1037.

4.  Rogalla, T. et al. (1999) J. Biol. Chem. 274, 18947-18956.

5.  Lavoie, J. et al. (1993) J. Biol. Chem. 268, 24210-24214.

6.  Rousseau, S. et al. (1997) Oncogene 15, 2169-2177.

7.  Park, K. et al. (2003) J. Biol. Chem. 278, 35272-35278.


Entrez-Gene Id 3315
Swiss-Prot Acc. P04792


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.