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Western blot analysis of extracts from HeLa cells treated with Calyculin A #9902 (100nM for 20 minutes) and transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® NDRG1 siRNA I (+) or SignalSilence® NDRG1 siRNA II #6257 (+), using Phospho-NDRG1 (Ser330) Antibody #3506 (upper) or α-Tubulin (11H10) Rabbit mAb #2125 (lower). The Phospho-NDRG1 (Ser330) Antibody confirms silencing of NDRG1 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 NDRG1 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® NDRG1 siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit NDRG1 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.

N-myc downstream-regulated gene 1 (NDRG1), also termed Cap43, Drg1, RTP/rit42, and Proxy-1, is a member of the NDRG family, which is composed of four members (NDRG1-4) that function in growth, differentiation, and cell survival (1-5). NDRG1 is ubiquitously expressed and highly responsive to a variety of stress signals including DNA damage (4), hypoxia (5), and elevated levels of nickel and calcium (2). Expression of NDRG1 is elevated in N-myc defective mice and is negatively regulated by N- and c-myc (1,6). During DNA damage, NDRG1 is induced in a p53-dependent fashion and is necessary for p53-mediated apoptosis (4,7). Research studies have shown that NDRG1 may also play a role in cancer progression by promoting differentiation, inhibiting growth, and modulating metastasis and angiogenesis (3,4,6,8,9). Nonsense mutation of the NDRG1 gene has been shown to cause hereditary motor and sensory neuropathy-Lom (HMSNL), which is supported by studies demonstrating the role of NDRG1 in maintaining myelin sheaths and axonal survival (10,11). NDRG1 is up-regulated during mast cell maturation and its deletion leads to attenuated allergic responses (12). Both NDRG1 and NDRG2 are substrates of SGK1, although the precise physiological role of SGK1-mediated phosphorylation is not known (13). NDRG1 is phosphorylated by SGK1 at Thr328, Ser330, Thr346, Thr356, and Thr366. Phosphorylation by SGK1 primes NDRG1 for phosphorylation by GSK-3.


1.  Shimono, A. et al. (1999) Mech Dev 83, 39-52.

2.  Zhou, D. et al. (1998) Cancer Res 58, 2182-9.

3.  van Belzen, N. et al. (1997) Lab Invest 77, 85-92.

4.  Kurdistani, S.K. et al. (1998) Cancer Res 58, 4439-44.

5.  Park, H. et al. (2000) Biochem Biophys Res Commun 276, 321-8.

6.  Li, J. and Kretzner, L. (2003) Mol Cell Biochem 250, 91-105.

7.  Stein, S. et al. (2004) J Biol Chem 279, 48930-40.

8.  Maruyama, Y. et al. (2006) Cancer Res 66, 6233-42.

9.  Nishio, S. et al. (2008) Cancer Lett 264, 36-43.

10.  Kalaydjieva, L. et al. (2000) Am J Hum Genet 67, 47-58.

11.  Okuda, T. et al. (2004) Mol Cell Biol 24, 3949-56.

12.  Taketomi, Y. et al. (2007) J Immunol 178, 7042-53.

13.  Murray, J.T. et al. (2004) Biochem J 384, 477-88.


Entrez-Gene Id 10397
Swiss-Prot Acc. Q92597


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.