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PhosphoSitePlus® Resource

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Figure 1. Target map of the PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) #7323.

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Figure 2. MCF7 cells were grown to 80% confluency and then serum starved overnight. Cells were either untreated (left panel) or treated with Human Insulin-like Growth Factor I (hIGF-I) #8917 (100 ng/ml, 20 min). Cell extracts were prepared and analyzed using the PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) #7323. Images were acquired by briefly exposing the slide to standard chemiluminescent film.

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Figure 3. HT-29 cells were grown to 80% confluency and then either untreated (left panel) or UV-irradiated and allowed to recover for 60 min (right panel). Cell extracts were prepared and analyzed using the PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) #7323. Images were acquired by briefly exposing the slide to standard chemiluminescent film.

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Figure 4. HeLa cells were grown to 90% confluency and then either untreated (upper panel) or treated with Staurosporine #9953 (1 μM, 3.5 hr; lower panel). Cell extracts were prepared and analyzed using the PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) #7323. Images were acquired by briefly exposing the slide to standard chemiluminescent film.

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PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) #7323 Protocol

A. Preparing Cell Lysates

  1. Thaw 1X Cell Lysis Buffer (#7018) and mix thoroughly. Supplement Cell Lysis Buffer with phenylmethylsulfonyl fluoride (PMSF) (#8553) to a final concentration of 1 mM, or a cocktail of protease inhibitors such as Protease Inhibitor Cocktail (100X) (#5871) or Protease/Phosphatase Inhibitor Cocktail (100X) (#5872). Keep lysis buffer on ice.
  2. Remove media and wash cells once with ice-cold 1X PBS.
  3. Remove PBS and add ice-cold Cell Lysis Buffer (#7018). For adherent cells, use 0.5 ml cell lysis buffer for each plate (10 cm in diameter). Incubate on ice for 2 minutes.
  4. Tilt the plate and collect the lysate into a clean micro tube.
  5. Optional step: microcentrifuge the lysate at maximum speed for 3 minutes at 4°C and transfer the supernatant to a new tube. This step is usually not required but can help remove any particles or large cell debris, if present. Lysate may be used immediately or stored at - 80°C in single-use aliquots.
  6. Immediately before performing the assay, dilute lysates to 0.2 – 1.0 mg/ml in Array Diluent Buffer. Set aside on ice.

B. Assay Procedure

  1. Bring glass slides and blocking buffer to room temperature before use.
  2. Prepare 1X Array Wash Buffer by diluting 20X Array Wash Buffer in deionized water. Keep at room temperature. Dilute 1 mL of 20X Array Wash Buffer with 19 mL of deionized water. Label as 1X Array Wash Buffer.
  3. Prepare 1X Detection Antibody Cocktail as follow:
    • For running only 1 slide: Dilute 150 µL of 10X Detection Antibody Cocktail with 1350 µL of Array Diluent Buffer.
    • For running 2 slides: Dilute 300 µL of 10X Detection Antibody Cocktail with 2700 µL of Array Diluent Buffer. *Keep on ice.
  4. Prepare 1X HRP-linked Streptavidin as follow:
    • For running only 1 slide: Dilute 150 µL of 10X HRP-linked Streptavidin with 1350 µL of Array Diluent Buffer.
    • For running 2 slides: Dilute 300 µL of 10X HRP linked Streptavidin with 2700 µL of Array Diluent Buffer. *Keep on ice.
  5. Affix the multi-well gasket to the glass slide (see figure below):
    1. Place the multi-well gasket face-down on the benchtop (the silicone layer should be facing up). Remove the protective plastic film.
    2. Carefully place the glass slide on top of the multi-well gasket with the nitrocellulose pads facing down while aligning the pads with the openings in the gasket. The orientation line should appear in the upper left hand corner when the slide is oriented vertically.
    3. Insert the metal clip into the groove in the gasket and rotate the clip into the locked position. Ensure that the clip is on the same side as the orientation line on the slide.

      Note: One of the clips has a small dot etched onto the upper rib to assist with pad designation (see slide assembly photos).

    4. Slide the clip into place.
    5. Snap the second metal clip to the other side of the assembly in the same manner and slide into place.
    6. The assembled array is ready to use.
  6. Add 100 μl Array Blocking Buffer to each well and cover with sealing tape. Incubate for 15 minutes at room temperature on an orbital shaker.

    Note: Do not allow the pads to dry out at any time during the assay.

  7. Decant Array Blocking Buffer by gently flicking out the liquid into a sink or other appropriate waste receptacle. Add 50 -75 μl diluted lysate to each well and cover with sealing tape. Incubate for 2 hours at room temp (or overnight at 4°C) on an orbital shaker.
  8. Decant well contents by gently flicking out the liquid into a sink or other appropriate waste receptacle. Add 100 μl (1X) Array Wash Buffer to each well and incubate for 5 minutes at room temperature on an orbital shaker. Repeat three more times. Decant well contents.
  9. Add 75 μl (1X) Detection Antibody Cocktail to each well and cover with sealing tape. Incubate for 1 hour at room temperature on an orbital shaker.
  10. Wash 4 X 5 minutes with 100 μl (1X) Array Wash Buffer as in step 8.
  11. Add 75 μl (1X) HRP-linked Streptavidin to each well and cover with sealing tape. Incubate for 30 minutes at room temperature on an orbital shaker.
  12. Wash 4 X 5 minutes with 100 μl (1X) Array Wash Buffer as in step 8.
  13. Remove multi-well gasket by pulling the bottom of the metal clips away from the center of the slide, then peeling the slide and gasket apart.
  14. Place the slide face up in a plastic dish (a clean pipette tip box cover works well). Wash briefly with 10 ml (1X) Array Wash Buffer.
  15. Dilute and combine LumiGLO® and Peroxide reagents (#7003) immediately before use (to make 10 ml of a 1X solution, combine 9 ml deionized water with 0.5 ml of 20X LumiGLO® and 0.5 ml of 20X Peroxide). Note for Kodak Biomax film users: This dilution of LumiGlo®/Peroxide may necessitate very short exposure times (2-3 seconds) for some targets. For more convenient exposure times (20-30 seconds) add 20 ml of deionized water to the 10 ml LumiGlo®/Peroxide mix to make a 3 fold more diluted chemiluminescent reagent.
  16. Decant Array Wash Buffer and cover slide with LumiGLO®/Peroxide reagent.
  17. Transfer slide to sheet protector, ensuring that it is still covered by LumiGLO®/Peroxide reagent (add a small amount on top of the slide).
  18. Immediately capture an image of the slide using a digital imaging system capable of detecting chemiluminescent signals. If desired, quantify spot intensities using commercially available array image analysis software. Alternatively, chemiluminescent film may be used. Expose film for 2-30 seconds using even and light pressure on the top of the development cassette (do not fasten the cassette clamps) to avoid squeezing out the LumiGLO®/ Peroxide reagent. Develop the film using an automated film developer.

    Note: If both slides are being used, it is not recommended to expose them simultaneously in the same development cassette. In this case, leave the second slide in the wash buffer (step 12) while proceeding with steps 13-18 using the first slide. After the first slide is finished, proceed with steps 13-18 using the second slide and freshly diluted LumiGLO®/Peroxide reagent.

Slide Assembly Photos

LumiGLO® is a registered trademark of Kirkegaard & Perry Laboratories.

Product Includes Quantity Cap Color
Array Slides - Intracellular Signaling Array Kit 2 ea
16-Well Gasket 2 ea
Sealing Tape 2 sheets
Chemiluminescent Development Folder
20X Array Wash Buffer 15 ml White
Array Blocking Buffer 5 ml Red
Array Diluent Buffer 15 ml Blue
Detection Ab Cocktail (10X) - Intracellular Signaling Array Kit 300 µl White
HRP-Linked Streptavidin (10X) 300 µl Clear
20X LumiGLO® Reagent and 20X Peroxide 7003 5 ml each Brown
PathScan® Sandwich ELISA Lysis Buffer (1X) 7018 30 ml Clear

Product Usage Information

Storage: Kit should be stored at 4°C with the exception of Lysis Buffer, which is stored at –20°C (packaged separately).

Product Description

The PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) is a slide-based antibody array founded upon the sandwich immunoassay principle. The array kit allows for the simultaneous detection of 18 important and well-characterized signaling molecules when phosphorylated or cleaved. Target-specific capture antibodies have been spotted in duplicate onto nitrocellulose-coated glass slides. Each kit contains two 16-pad slides, allowing the user to test up to 32 samples and generate 576 data points in a single experiment. Cell lysate is incubated on the slide followed by a biotinylated detection antibody cocktail. Streptavidin-conjugated HRP and LumiGLO® Reagent are then used to visualize the bound detection antibody by chemiluminescence. An image of the slide can be captured with either a digital imaging system or standard chemiluminescent film. The image can be analyzed visually or the spot intensities quantified using array analysis software.


Specificity / Sensitivity

PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout) detects the indicated cellular proteins and signaling nodes only when phosphorylated or cleaved at the specified residues. (see Array Target Map). No significant cross-reactivity has been observed between targets. This kit is optimized for cell lysates diluted to a total protein concentration between 0.2 and 1 mg/ml (see kit protocol).


Species Reactivity: Human

Phosphorylation and proteolysis are two widespread covalent post-translational modifications that represent important regulatory mechanisms in biology. Detection of these modifications on a set of cellular proteins playing a well-understood role in cell biology can provide a broad snapshot of intracellular signaling.

The MAPK/Erk cascade is one of the best characterized and widely studied signaling modules. It is involved in a broad range of cellular processes such as proliferation, differentiation, and motility. MAPK/Erk is activated by a wide range of extracellular signals including growth factors, cytokines, hormones, and neurotransmitters. It is activated by dual phosphorylation at Thr202 and Tyr204 by the dual specificity kinases MEK1 and MEK2.

p38 and JNK MAPKs are core components of two additional structurally related signal transduction modules. p38 and JNK are activated through a similar dual phosphorylation mechanism by various MAPK kinases in response to pro-inflammatory cytokines, stressful conditions, or genotoxicity.

Stat1 and Stat3 are important signaling molecules that are involved in immunity and inflammation and can be activated by a variety of cytokines or growth factors. Stat1 and Stat3 are phosphorylated at Tyr701 or Tyr705, respectively, by cytokine receptor-tethered tyrosine kinases of the Jak family or, in some cases, by other tyrosine kinases such as Src.

Akt is a protein kinase generally activated in response to growth factor stimulation that transmits growth and survival signals. Phosphorylation of Akt at Ser473 and Thr308 by TORC2 complex and PDK1, respectively, are reliable predictors of Akt activation. Phosphorylation of PRAS40 at Thr246 by Akt relieves PRAS40 inhibition of TORC1. Akt phosphorylation of the pro-apoptotic protein Bad at Ser112 and the multifunctional kinase GSK-3β at Ser9 inhibits their activity and promotes cell survival.

mTOR is an important signaling hub that is a major component of two macromolecular complexes, TORC1 and TORC2. mTOR is phosphorylated at Ser2448 and integrates growth factor signaling and nutrient availability, thus playing an important role in cell growth and homeostasis. mTORC1 phosphorylates p70 S6 Kinase at Thr389, leading to kinase activation and cell cycle progression. The S6 ribosomal protein is found downstream of p70 S6 Kinase and its phosphorylation at Ser235/236 reflects mTOR pathway activation and predicts cell cycle progression.

AMPK is an energy sensor that is activated by phosphorylation at Thr172 in response to elevated AMP levels. AMPK regulates fatty acid metabolism, as well as modulates protein synthesis and cell growth.

HSP27 is a mediator of cell stress that confers resistance to adverse environmental change. HSP27 is phosphorylated at Ser78 within the p38 MAPK pathway.

p53 plays an important role in cellular response to DNA damage and other genomic aberrations. Phosphorylation of p53 at Ser15 by ATM/ATR or DNA-PK in response to DNA damage leads to its stabilization and accumulation.

Caspase-3 is a critical executor of apoptosis. Caspase-3 is activated by endoproteolytic cleavage at Asp175 and exerts its pro-apoptotic activity through cleavage of multiple cellular targets. PARP, an enzyme that is involved in DNA repair, is one of the main substrates of activated caspase-3. Cleavage at Asp214 leads to PARP inactivation. Increased levels of cleaved caspase-3 and cleaved PARP are reliable indicators of apoptosis.


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

2.  Huang, J. and Manning, B.D. (2009) Biochem Soc Trans 37, 217-22.

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

4.  Hardie, D.G. et al. (2012) Nat Rev Mol Cell Biol 13, 251-62.

5.  Rubinfeld, H. and Seger, R. (2005) Mol Biotechnol 31, 151-74.

6.  Keshet, Y. and Seger, R. (2010) Methods Mol Biol 661, 3-38.

7.  Cuadrado, A. and Nebreda, A.R. (2010) Biochem J 429, 403-17.

8.  Brognard, J. and Hunter, T. (2011) Curr Opin Genet Dev 21, 4-11.

9.  Hunter, T. (2009) Curr Opin Cell Biol 21, 140-6.

10.  Manning, G. et al. (2002) Science 298, 1912-34.

11.  Kurokawa, M. and Kornbluth, S. (2009) Cell 138, 838-54.

12.  Shi, Y. (2004) Cell 117, 855-8.

13.  Boatright, K.M. and Salvesen, G.S. (2003) Curr Opin Cell Biol 15, 725-31.


Entrez-Gene Id 207 , 208 , 10000 , 5562 , 5563 , 572 , 836 , 5595 , 5594 , 2932 , 3315 , 2475 , 1432 , 5600 , 5603 , 6300 , 7157 , 6198 , 142 , 84335 , 6194 , 5599 , 6772 , 6774


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.
LumiGLO is a registered trademark of Kirkegaard & Perry Laboratories.

7323
PathScan® Intracellular Signaling Array Kit (Chemiluminescent Readout)