Figure 1: Schematic representation of the position of targets in a single well.
Figure 2: NIH/3T3 cells were starved and stimulated with PDGF (100 ng/ml) for 5 or 40 minutes. Lysates were analyzed using the PathScan® Cell Growth 4-Plex Array Kit. Plate analysis was performed using a Quansys Biosciences Imager. Spot intensity was quantified using Q-View™ software. The bar graph shows the measurements of four different target proteins. Corresponding Western blots obtained with the same cell lysates are shown at the bottom.
Figure 3: Cell extracts from unstimulated or stimulated NIH/3T3 cells were applied to wells at increasing total protein concentrations and analyzed. Luminescent signals were acquired and spot intensity quantified. The graphs show the relationship between the total protein concentration and the resulting strength of the luminescent signal for each target.
CST’s PathScan® Cell Growth 4-Plex Array Kit is based upon the sandwich ELISA principle. Rather than one immobilized antibody, these PathScan® 4-Plex Array Kits contain four different antibodies in each well of a 96-well plate. This allows the researcher to measure four different target proteins from a single well simultaneously. In addition, the incorporation of multiple phospho-specific antibody pairs allows the researcher to measure the activation state of important signaling nodes. The PathScan® Cell Growth 4-Plex Array Kit allows the detection of: Phospho-Akt1 (Ser473); Phospho-S6 Ribosomal Protein (Ser235/236); Phospho-p44 MAPK (Thr202/Tyr 204); and Total Akt1 protein.
Briefly, 4 capture antibodies with distinct target specificity have been spotted onto the bottom of each well of a microwell plate. After incubation with cell lysates, the spotted antibodies capture the target proteins. Following extensive washing, a mixture of detection antibodies is added to detect the captured target proteins. An HRP-linked secondary solution is then used to recognize the bound detection antibodies. Chemiluminescent HRP substrate is used to produce luminescent signal.
Kit should be stored at 4°C with the exception of Lysis Buffer, which is stored at –20°C (packaged separately).
PathScan® Cell Growth 4-Plex Array Kit detects endogenous levels of all target proteins. As shown in Figure 2, stimulation of NIH/3T3 cells with PDGF promotes phosphorylation of Akt1 at Ser473, S6 ribosomal protein at Ser235/236 and p44 MAP kinase at Thr202/Tyr204. Levels of total Akt1 remain unchanged.
Cells must respond in an appropriate fashion to many complex signaling events. Extracellular signaling cues are organized into well defined signal transduction modules that control fundamental cellular behavior. Two prominent signaling modules that are among the best characterized are the p44/42 MAP kinase (ERK MAPK) and Akt signal transduction pathways. These signaling modules control cellular growth, proliferation, movement, survival and death. The p44/42 MAPK is activated by a wide variety of extracellular signals including growth and neurotrophic factors, cytokines, hormones and neurotransmitters. p44/42 MAPK activation occurs through phosphorylation of threonine and tyrosine at the sequence T*EY* by a dual specificity kinase called MAP kinase kinase (MEK). The Akt protein kinase is generally activated in response to growth-factor stimulation and phosphorylated on Ser473. Growth factor stimulation results in phosphorylation of S6 ribosomal protein on Ser235/236, leading to an increase in protein synthesis and cell cycle progression. Phosphorylation levels of critical molecular switches such as MAPs and Akt therefore serve as a reliable indicator of the activation state of the entire signaling module. The profiling of phosphorylation events using phospho-specific antibodies is now widely used to investigate diagnostic pathology (1,2). For example, increased levels of Akt phosphorylated at Ser473 coupled with decreased levels of phospho-p44/42 predicts poor clinical outcome in prostate cancer patients (3). The PathScan® Cell Growth 4-Plex Array Kit provides the researcher with means to profile numerous chemical compounds and obtain in-cell relative potency (4).
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