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Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® Fatty Acid Synthase siRNA I (+), or SignalSilence® Fatty Acid Synthase siRNA II #12613 (+), using Fatty Acid Synthase (C20G5) Rabbit mAb #3180 (upper) or β-Actin (D6A8) Rabbit mAb #8457 (lower). The Fatty Acid Synthase (C20G5) Rabbit mAb confirms silencing of fatty acid synthase expression, while the β-Actin (D6A8) Rabbit mAb is used as a loading control.

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Custom Ordering Details: This item is packaged to order. Please allow two to three days for your order to be processed and shipped.

Product Usage Information

CST recommends transfection with 100 nM SignalSilence® Fatty Acid Synthase 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® Fatty Acid Synthase siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit fatty acid synthase 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.

Fatty acid synthase (FASN) catalyzes the synthesis of long-chain fatty acids from acetyl-CoA and malonyl-CoA. FASN is active as a homodimer with seven different catalytic activities and produces lipids in the liver for export to metabolically active tissues or storage in adipose tissue. In most other human tissues, FASN is minimally expressed since they rely on circulating fatty acids for new structural lipid synthesis (1).

According to the research literature, increased expression of FASN has emerged as a phenotype common to most human carcinomas. For example in breast cancer, immunohistochemical staining showed that the levels of FASN are directly related to the size of breast tumors (2). Research studies also showed that FASN is highly expressed in lung and prostate cancers and that FASN expression is an indicator of poor prognosis in breast and prostate cancer (3-5). Furthermore, inhibition of FASN is selectively cytotoxic to human cancer cells (5). Thus, increased interest has focused on FASN as a potential target for the diagnosis and treatment of cancer as well as metabolic syndrome (6,7).


1.  Katsurada, A. et al. (1990) Eur J Biochem 190, 427-33.

2.  Wells, W.A. et al. (2006) Breast Cancer Res Treat 98, 231-40.

3.  Kawamura, T. et al. (2005) Pathobiology 72, 233-240.

4.  Shah, U.S. et al. (2006) Hum Pathol 37, 401-409.

5.  Kuhajda, F.P. (2000) Nutrition 16, 202-8.

6.  Tian, W.X. (2006) Curr Med Chem 13, 967-977.

7.  Kusunoki, J. et al. (2006) Endocrine 29, 91-100.


Entrez-Gene Id 2194
Swiss-Prot Acc. P49327


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.