Cell Signaling Technology

Product Pathways - Jak/Stat Pathway

SignalSilence® Stat5 siRNA I #6275

Applications Reactivity
Transfection H

Reactivity Key:  H=Human
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Western Blotting

Western Blotting

Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® Stat5 siRNA I (+), or SignalSilence® Stat5 siRNA II #6298 (+), using Stat5 (3H7) Rabbit mAb #9358 (upper) or α-Tubulin (11H10) Rabbit mAb #2125 (lower). The Stat5 (3H7) Rabbit mAb confirms silencing of Stat5 expression, while the α-Tubulin (11H10) Rabbit mAb is used as a loading control.

Description

SignalSilence® Stat5 siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit Stat5 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.

Directions for Use

CST recommends transfection with 100 nM Stat5 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.

Background

Stat5 is activated in response to a wide variety of ligands including IL-2, GM-CSF, growth hormone and prolactin. Phosphorylation at Tyr694 is obligatory for Stat5 activation (1,2). This phosphorylation is mediated by Src upon erythropoietin stimulation (3). Stat5 is constitutively active in some leukemic cell types (4). Phosphorylated Stat5 is found in some endothelial cells treated with IL-3, which suggests its involvement in angiogenesis and cell motility (5). Stat5a and Stat5b are independently regulated and activated in various cell types. For instance, interferon treatment predominantly activates Stat5a in U-937 cells and Stat5b in HeLa cells (6).

  1. Gouilleux, F. et al. (1994) EMBO J. 13, 4361-4369.
  2. Wakao, H. et al. (1994) EMBO J. 13, 2182-2191.
  3. Okutani, Y. et al. (2001) Oncogene 20, 6643-6650.
  4. Demoulin, J.B. et al. (1999) J. Biol. Chem. 274, 25855-25861.
  5. Dentelli, P. et al. (1999) J. Immunol. 163, 2151-2159.
  6. Meinke, A. et al. (1996) Mol. Cell. Biol. 16, 6937-6944.

Application References

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Companion Products

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.

For Research Use Only. Not For Use In Diagnostic Procedures.

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