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REACTIVITY
Product Includes Volume Solution Color
Akt Rabbit Antibody Coated Microwells 16 tests
Akt1 Mouse Detection Antibody 1.8 ml Green
Anti-mouse IgG, HRP-linked Antibody 1.8 ml Red
Phospho-Akt (S473) Rabbit Antibody Coated Microwells 16 tests
Akt1 Mouse Detection Antibody 1.8 ml Green
Anti-mouse IgG, HRP-linked Antibody 1.8 ml Red
Akt Rabbit Antibody Coated Microwells 16 tests
Phospho-Akt (T308) Mouse Detection Antibody 1.8 ml Green
Anti-mouse IgG, HRP-linked Antibody 1.8 ml Red
Phospho-p44/42 MAPK (T202/Y204) Rabbit Antibody Coated Microwells 16 tests
p44/42 MAPK Mouse Detection Antibody 1.8 ml Green
Anti-mouse IgG, HRP-linked Antibody 1.8 ml Red
S6 Ribosomal Protein Mouse Antibody Coated Microwells 16 tests
S6 Ribosomal Protein Rabbit Detection Antibody 1.8 ml Green
Anti-rabbit IgG, HRP-linked Antibody 1.8 ml Red
Phospho-S6 Ribosomal Protein (S235/236) Rabbit Antibody Coated Microwells 16 tests
S6 Ribosomal Protein Mouse Detection Antibody 1.8 ml Green
Anti-mouse IgG, HRP-linked Antibody 1.8 ml Red
TMB Substrate 7004 11 ml Colorless
STOP Solution 7002 11 ml Colorless
Sealing Tape 2 sheets
ELISA Wash Buffer (20X) 25 ml Colorless
Sample Diluent 25 ml Blue
Cell Lysis Buffer (10X) 9803 15 ml Yellowish

Product Description

CST’s PathScan® Cell Growth Multi-Target Sandwich ELISA Kit is a solid phase sandwich enzyme-linked immunosorbent assay (ELISA) that combines the reagents necessary to detect endogenous levels of S6 ribosomal protein, phospho-S6 ribosomal protein (Ser235/236), Akt1, phospho-Akt (Ser473), phospho-Akt (Thr308) and phospho-p44/42 MAPK (Thr202/Tyr204). These molecules represent key signaling proteins in pathways controlling growth and differentiation. Sixteen assays are provided for each target protein. Specific assay formulations for the indicated target proteins can be found in the datasheets associated with the individual sandwich ELISA kits*. Briefly, a capture antibody** has been coated onto the microwells. After incubation with cell lysates, the target protein is captured by the coated antibody. Following extensive washing, a detection antibody** is added to detect the captured target protein. An HRP-linked secondary antibody is then used to recognize the bound detection antibody. HRP substrate, TMB, is added to develop color. The magnitude of absorbance for this developed color is proportional to the quantity of bound target protein. *See companion products. **Antibodies in kit are custom formulations specific to kit.


Specificity / Sensitivity

CST's PathScan® Cell Growth Multi-Target Sandwich ELISA Kit #7239 detects endogenous levels of six proteins: S6 ribosomal protein, phospho-S6 ribosomal protein (Ser235/236), Akt1, phospho-Akt (Ser473), phosho-Akt (Thr308) and phospho-p44/42 MAPK (Thr202/Tyr204). Activation of these proteins can be observed over time in response to PDGF. As shown in Figure 1, stimulation of serum-starved NIH/3T3 cells with PDGF promotes phosphorylation of Akt1 at Thr308 and Ser473, S6 ribosomal protein at Ser235/236 and p44/42 MAPK at Thr202/Tyr204. The level of each target protein (phospho and nonphospho) remains unchanged throughout the 80 minute time course as demonstrated by Western analysis.

The relationship between the protein concentration of the lysate and the absorbance at 450 nm can be found in the datasheets associated with the individual PathScan® Sandwich ELISA Kits*. *See companion products.

This kit detects proteins from the indicated species, as determined through in-house testing, but may also detect homologous proteins from other species.


Akt is a protooncogene with a critical regulatory role in diverse cellular processes including growth, survival and the cell cycle. Akt is also a major regulator of insulin signaling and glucose metabolism (1-4). Akt is activated by PI3 kinase signaling and activation loop phosphorylation at Thr308 by PDK1 and by phosphorylation within the carboxy terminus at Ser473 by the mTOR-rictor complex (TORC1) (5-7).

Both p44 and p42 MAP kinases (Erk1 and Erk2) function in a protein kinase cascade that plays a critical role in the regulation of cell growth and differentiation (8-13). MAP kinases are activated by a wide variety of extracellular signals including growth and neurotrophic factors, cytokines, hormones and neurotransmitters. Activation of MAP kinases occurs through phosphorylation of threonine and tyrosine (202 and 204 of human MAP kinase or 183 and 185 of rat MAP kinase) at the sequence T*EY* by a single upstream MAP kinase kinase (MEK) (14,15).

To effectively promote growth and cell division in a sustained manner, growth factors and mitogens must upregulate translation (16,17). Growth factors and mitogens induce the activation of p70 S6 kinase, which in turn phosphorylates the S6 ribosomal protein. Phosphorylation of S6 ribosomal protein correlates with an increase in translation, particularly of mRNAs with an oligopyrimidine tract in their 5' untranslated regions (17). This group of mRNAs (5'TOP) encodes proteins involved in cell cycle progression and proteins that are part of the translational machinery, such as ribosomal proteins and elongation factors (17,18). The main in vivo S6 ribosomal protein phosphorylation sites, including Ser235, Ser236, Ser240 and Ser244, are located within a small 19 amino acid region in the S6 carboxy terminus (19,20).


1.  Kim, D. and Chung, J. (2002) J Biochem Mol Biol 35, 106-15.

2.  McKay, M.M. and Morrison, D.K. (2007) Oncogene 26, 3113-21.

3.  Dufner, A. and Thomas, G. (1999) Exp Cell Res 253, 100-9.

4.  Zdychová, J. and Komers, R. (2005) Physiol Res 54, 1-16.

5.  Peterson, R.T. and Schreiber, S.L. (1998) Curr Biol 8, R248-50.

6.  Song, G. et al. J Cell Mol Med 9, 59-71.

7.  Hill, C.S. and Treisman, R. (1995) Cell 80, 199-211.

8.  Jefferies, H.B. et al. (1997) EMBO J 16, 3693-704.

9.  Alessi, D.R. et al. (1996) EMBO J 15, 6541-51.

10.  Cowley, S. et al. (1994) Cell 77, 841-852.

11.  Ferrari, S. et al. (1991) J Biol Chem 266, 22770-5.

12.  Manning, B.D. and Cantley, L.C. (2007) Cell 129, 1261-74.

13.  Sarbassov, D.D. et al. (2005) Science 307, 1098-101.

14.  Hunter, T. (1995) Cell 80, 225-36.

15.  Flotow, H. and Thomas, G. (1992) J Biol Chem 267, 3074-8.

16.  Jacinto, E. et al. (2006) Cell 127, 125-37.

17.  Pearson, G. et al. (2001) Endocr Rev 22, 153-83.

18.  Marshall, C.J. (1995) Cell 80, 179-85.

19.  Sturgill, T.W. et al. (1988) Nature 334, 715-8.

20.  Payne, D.M. et al. (1991) EMBO J 10, 885-92.



For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
PathScan® is a trademark of Cell Signaling Technology, Inc.