Western Blot: 1-5 μg/mLPositive Control: HeLa Cells. Immunoprecipitation: 3 μg/200-300 μL of cell extract. Positive Control: HeLa Cells. Immunohistochemistry: 1-5 μg/mLHeat treatment is necessary for Paraffin Embedded Sections. Microwave oven: 2 times for 10 minutes each in citrate buffer ( pH 6.5). Positive Controls: Tonsil Tissue. Detailed procedure is provided in Protocols. Other applications not tested. Optimal dilutions are dependent on conditions and should be determined by the user.
Protocol
SDS-PAGE & Western Blotting1) Wash the cells 3 times with PBS and suspend with 10 volume of cold Lysis buffer (50 mMTris-HCl, pH 7. 2, 250 mM NaCl, 0. 1% NP-40, 2 mM EDTA, 10% glycerol) containingappropriate protease inhibitors. Incubate it at 4°C with rotating for 30 minutes, thensonicate briefly (up to 10 seconds). 2) Centrifuge the tube at 12,000 x g for 10 minutes at 4°C and transfer the supernatant toanother tube. Measure the protein concentration of the supernatant and add the Lysisbuffer to make 8 mg/mL solution. 3) Mix the sample with equal volume of Laemmli’s sample buffer. 4) Boil the samples for 2 minutes and centrifuge. Load 10 μL of the sample per lane in a 1mm thick SDS-polyacrylamide gel for electrophoresis. 5) Blot the protein to a polyvinylidene difluoride (PVDF) membrane at 1 mA/cm2 for 1 hourin a semi-dry transfer system. (Transfer Buffer: 25 mM Tris, 190 mM glycine, 20% MeOH). See the manufacture's manual for the transfer procedure. 6) To reduce nonspecific binding, soak the membrane in 10% skimmed milk (in PBS, pH7. 2) for 1 hour at room temperature, or overnight at 4°C. 7) Incubate the membrane with the anti-p21WAF1/CIP1 (DCS-60) monoclonal antibody (1-5μg/mL) diluted with 1% skimmed milk (in PBS, pH 7. 2) for 1 hour at room temperature. 8) Wash the membrane with PBS (5 minutes x 6 times). 9) Incubate the membrane with the 1: 10000 POD-conjugated anti-mouse IgG diluted with1% skimmed milk (in PBS, pH 7. 2) for 1 hour at room temperature. 10) Wash the membrane with PBS (5 minutes x 6 times). 11) Wipe excess buffer from the membrane, then incubate it with appropriatechemiluminescence reagents for 1 minute. Remove extra reagent from the membrane bydabbing with a paper towel, and seal it in plastic wrap. 12) Expose to an X-ray film in a dark room for 5 minutes. Develop the film as usual. Theconditions for exposure and development may vary. Positive Control for Western blotting: HeLa. Immunoprecipitation1) Wash the cells 3 times with PBS and suspend with 10 volume of cold Lysis buffer (50 mMTris-HCl, pH 7. 2, 250 mM NaCl, 0. 1% NP-40, 2 mM EDTA, 10% glycerol) containingappropriate protease inhibitors. Incubate it at 4°C with rotating for 30 minutes, thensonicate briefly (up to 10 seconds). 2) Centrifuge the tube at 12,000 x g for 10 minutes at 4°C and transfer the supernatant toanother tube. 3) Add 3 μg of the anti-p21WAF1/CIP1 (DCS-60) monoclonal antibody into 250 μL of thesupernatant. Mix well and incubate with gentle agitation for 30-120 minutes at 4°C. Add 20μL of 50% Protein A-agarose beads resuspended in the Lysis buffer. Mix well and incubatewith gentle agitation for 60 minutes at 4°C. 4) Wash the beads 3-5 times with ice-cold Lysis buffer (centrifuge the tube at 2,500 x g for10 seconds). 5) Resuspend the beads in 20 μL of Laemmli’s sample buffer, boil for 3-5 minutes, andcentrifuge for 5 minutes. Use 10 μL/lane for the SDS-PAGE analysis. (See SDS-PAGE & Western blotting. )Positive Controls for immunoprecipitation: HeLa cells.
Restrictions
For Research Use only
Concentration
1.0 mg/mL
Buffer
PBS, pH 7.2 containing 50 % Glycerol without preservatives.
Preservative
Without preservative
Storage
-20 °C
Storage Comment
Store the antibody undiluted at -20 °C. Shelf life: one year from despatch.
P21WAF1/CIP1 is one member of the CIP/KIP family that controls the cell cycle by inhibiting cyclin dependent kinases (CDKs) activity. Increased expression of p21WAF1/CIP1 may play an important role in the growth arrest induced in transformed cells. It is reported that hypermethylation of the p21WAF1/CIP1 promoter region inactivate p21WAF1/CIP1 gene leading tumorigenesis, and also reported that p21WAF1/CIP1 acts as an inhibitor of apoptosis in a number of systems in addition to being an inhibitor of cell proliferation.Synonyms: CAP20, CDK-interacting protein 1, CDKN1, CIP1, Cyclin-dependent kinase inhibitor 1, MDA-6, MDA6, Melanoma differentiation-associated protein 6, PIC1, SDI1, WAF1