Description
STAT1 (Phospho-Ser727)Colorimetric Cell-Based ELISA Kit
The STAT1 Phospho-Ser727 Colorimetric Cell-Based ELISA Kit is specifically designed for the quantitative detection of phosphorylated STAT1 at serine 727 in cell lysates. This kit provides a precise and reliable measurement of STAT1 activation, allowing researchers to study signaling pathways involved in immune response, cell growth, and differentiation.The phosphorylation of STAT1 at serine 727 is known to regulate its nuclear translocation and transcriptional activity, playing a crucial role in the modulation of cytokine signaling and antiviral defense mechanisms. By accurately measuring STAT1 phosphorylation levels, this kit enables researchers to gain insights into the molecular mechanisms underlying various diseases, including cancer, infectious diseases, and autoimmune disorders.
With its high sensitivity and specificity, the STAT1 Phospho-Ser727 Colorimetric Cell-Based ELISA Kit offers a robust and efficient solution for studying STAT1 signaling pathways in a wide range of experimental settings. Its ease of use and reproducibility make it an indispensable tool for unraveling the complex roles of STAT1 phosphorylation in cellular processes and disease development.
| Product Name: | STAT1 (Phospho-Ser727)Colorimetric Cell-Based ELISA Kit |
| Product Code: | CBCAB00258 |
| ELISA Type: | Cell-Based |
| Target: | STAT1 (Phospho-Ser727) |
| Reactivity: | Human, Mouse, Rat |
| Dynamic Range: | > 5000 Cells |
| Detection Method: | Colorimetric 450 nm |
| Format: | 2 x 96-Well Microplates |
The STAT1 (Phospho-Ser727) Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect STAT1 protein phosphorylation and expression profile in cells. The kit can be used for measuring the relative amounts of phosphorylated STAT1 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on STAT1 phosphorylation.
Qualitative determination of STAT1 (Phospho-Ser727) concentration is achieved by an indirect ELISA format. In essence, STAT1 (Phospho-Ser727) is captured by STAT1 (Phospho-Ser727)-specific primary antibodies while the HRP-conjugated secondary antibodies bind the Fc region of the primary antibody. Through this binding, the HRP enzyme conjugated to the secondary antibody can catalyze a colorimetric reaction upon substrate addition. Due to the qualitative nature of the Cell-Based ELISA, multiple normalization methods are needed:
| 1. | A monoclonal antibody specific for human GAPDH is included to serve as an internal positive control in normalizing the target absorbance values. |
| 2. | Following the colorimetric measurement of HRP activity via substrate addition, the Crystal Violet whole-cell staining method may be used to determine cell density. After staining, the results can be analysed by normalizing the absorbance values to cell amounts, by which the plating difference can be adjusted. |
| Database Information: | Gene ID: 6772, UniProt ID: P42224, OMIM: 209950/600555, Unigene: Hs.642990 |
| Gene Symbol: | STAT1 |
| Sub Type: | Phospho |
| UniProt Protein Function: | STAT1: transcription factor of the STAT family. Phosphorylated and activated by receptor-associated kinases downstream of certain receptor tyrosine kinases, GPCRs, and receptors for various interleukins and interferons. Forms homo- or heterodimers that translocate into the nucleus where they regulate transcription. Two alternatively spliced isoforms have been described. |
| UniProt Protein Details: | Protein type:DNA-binding; Transcription factor Chromosomal Location of Human Ortholog: 2q32.2 Cellular Component: axon; cytoplasm; cytosol; dendrite; nuclear chromatin; nucleolus; nucleoplasm; nucleus; perinuclear region of cytoplasm Molecular Function:double-stranded DNA binding; enzyme binding; identical protein binding; protein binding; protein homodimerization activity; signal transducer activity; transcription factor activity; tumor necrosis factor receptor binding Biological Process: apoptosis; blood circulation; defense response to virus; endothelial cell migration; JAK-STAT cascade; negative regulation of angiogenesis; negative regulation of endothelial cell proliferation; negative regulation of I-kappaB kinase/NF-kappaB cascade; negative regulation of transcription from RNA polymerase II promoter; negative regulation of viral protein levels in host cell; positive regulation of mesenchymal cell proliferation; positive regulation of smooth muscle cell proliferation; positive regulation of transcription from RNA polymerase II promoter; positive regulation of transcription, DNA-dependent; regulation of apoptosis; regulation of transcription from RNA polymerase II promoter; response to cAMP; response to cytokine stimulus; response to peptide hormone stimulus; transcription, DNA-dependent; tumor necrosis factor-mediated signaling pathway; viral reproduction Disease: Immunodeficiency 31a; Immunodeficiency 31b; Immunodeficiency 31c |
| NCBI Summary: | The protein encoded by this gene is a member of the STAT protein family. In response to cytokines and growth factors, STAT family members are phosphorylated by the receptor associated kinases, and then form homo- or heterodimers that translocate to the cell nucleus where they act as transcription activators. This protein can be activated by various ligands including interferon-alpha, interferon-gamma, EGF, PDGF and IL6. This protein mediates the expression of a variety of genes, which is thought to be important for cell viability in response to different cell stimuli and pathogens. Two alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jul 2008] |
| UniProt Code: | P42224 |
| NCBI GenInfo Identifier: | 2507413 |
| NCBI Gene ID: | 6772 |
| NCBI Accession: | P42224.2 |
| UniProt Secondary Accession: | P42224,Q53S88, Q53XW4, Q68D00, Q9UDL5, A8K989, B2RCA0 D2KFR8, D3DPI7, |
| UniProt Related Accession: | P42224 |
| Molecular Weight: | |
| NCBI Full Name: | Signal transducer and activator of transcription 1-alpha/beta |
| NCBI Synonym Full Names: | signal transducer and activator of transcription 1 |
| NCBI Official Symbol: | STAT1 |
| NCBI Official Synonym Symbols: | CANDF7; IMD31A; IMD31B; IMD31C; ISGF-3; STAT91 |
| NCBI Protein Information: | signal transducer and activator of transcription 1-alpha/beta |
| UniProt Protein Name: | Signal transducer and activator of transcription 1-alpha/beta |
| UniProt Synonym Protein Names: | Transcription factor ISGF-3 components p91/p84 |
| Protein Family: | Signal transducer and activator of transcription |
| UniProt Gene Name: | STAT1 |
| UniProt Entry Name: | STAT1_HUMAN |
| Component | Quantity |
| 96-Well Cell Culture Clear-Bottom Microplate | 2 plates |
| 10X TBS | 24 mL |
| Quenching Buffer | 24 mL |
| Blocking Buffer | 50 mL |
| 15X Wash Buffer | 50 mL |
| Primary Antibody Diluent | 12 mL |
| 100x Anti-Phospho Target Antibody | 60 µL |
| 100x Anti-Target Antibody | 60 µL |
| Anti-GAPDH Antibody | 60 µL |
| HRP-Conjugated Anti-Rabbit IgG Antibody | 12 mL |
| HRP-Conjugated Anti-Mouse IgG Antibody | 12 mL |
| SDS Solution | 12 mL |
| Stop Solution | 24 mL |
| Ready-to-Use Substrate | 12 mL |
| Crystal Violet Solution | 12 mL |
| Adhesive Plate Seals | 2 seals |
The following materials and/or equipment are NOT provided in this kit but are necessary to successfully conduct the experiment:
- Microplate reader able to measure absorbance at 450 nm and/or 595 nm for Crystal Violet Cell Staining (Optional)
- Micropipettes with capability of measuring volumes ranging from 1 µL to 1 ml
- 37% formaldehyde (Sigma Cat# F-8775) or formaldehyde from other sources
- Squirt bottle, manifold dispenser, multichannel pipette reservoir or automated microplate washer
- Graph paper or computer software capable of generating or displaying logarithmic functions
- Absorbent papers or vacuum aspirator
- Test tubes or microfuge tubes capable of storing ≥1 ml
- Poly-L-Lysine (Sigma Cat# P4832 for suspension cells)
- Orbital shaker (optional)
- Deionized or sterile water
*Note: Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.
| Step | Procedure |
| 1. | Seed 200 µL of 20,000 adherent cells in culture medium in each well of a 96-well plate. The plates included in the kit are sterile and treated for cell culture. For suspension cells and loosely attached cells, coat the plates with 100 µL of 10 µg/ml Poly-L-Lysine (not included) to each well of a 96-well plate for 30 minutes at 37°C prior to adding cells. |
| 2. | Incubate the cells for overnight at 37°C, 5% CO2. |
| 3. | Treat the cells as desired. |
| 4. | Remove the cell culture medium and rinse with 200 µL of 1x TBS, twice. |
| 5. | Fix the cells by incubating with 100 µL of Fixing Solution for 20 minutes at room temperature. The 4% formaldehyde is used for adherent cells and 8% formaldehyde is used for suspension cells and loosely attached cells. |
| 6. | Remove the Fixing Solution and wash the plate 3 times with 200 µL 1x Wash Buffer for five minutes each time with gentle shaking on the orbital shaker. The plate can be stored at 4°C for a week. |
| 7. | Add 100 µL of Quenching Buffer and incubate for 20 minutes at room temperature. |
| 8. | Wash the plate 3 times with 1x Wash Buffer for 5 minutes each time. |
| 9. | Add 200 µL of Blocking Buffer and incubate for 1 hour at room temperature. |
| 10. | Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time. |
| 11. | Add 50 µL of 1x primary antibodies Anti-STAT1 (Phospho-Ser727) Antibody, Anti-STAT1 Antibody and/or Anti-GAPDH Antibody) to the corresponding wells, cover with Parafilm and incubate for 16 hours (overnight) at 4°C. If the target expression is known to be high, incubate for 2 hours at room temperature. |
| 12. | Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time. |
| 13. | Add 50 µL of 1x secondary antibodies (HRP-Conjugated AntiRabbit IgG Antibody or HRP-Conjugated Anti-Mouse IgG Antibody) to corresponding wells and incubate for 1.5 hours at room temperature. |
| 14. | Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time. |
| 15. | Add 50 µL of Ready-to-Use Substrate to each well and incubate for 30 minutes at room temperature in the dark. |
| 16. | Add 50 µL of Stop Solution to each well and read OD at 450 nm immediately using the microplate reader. |
(Additional Crystal Violet staining may be performed if desired – details of this may be found in the kit technical manual.)
