（交流）细胞ELISA

Cellular ELISA Protocol

Formalin Fixed Cell Plates
1. Trypsinize confluent flasks
2. Pool and count cells
3. Centrifuge at 1500 rpm for 10 minutes
4. Resuspend to the appropriate concentration in complete medium
4 x 105 cells/ml for epithelial cells
2 x 105 cells/ml for fibroblast cells
5. Add 100 ml/cell to 96 well culture plates.
6. Incubate overnight at 37oC.
7. Wash plates twice with PBS
8. Add 125 ml/well 10% Buffered Formalin
9. Fix for 15 minutes at room temperature
10. Wash three times with di-H2O.
11. Blot dry.
12. Store at 2-8oC.

B. Reagents
1. PBS:1% BSA
2. PBS:2% BSA
3. Carbonate Buffer
1.59 g Na2CO3
2.93 g NaHCO3
Dissolve in 900 ml di-H2O. Check pH and adjust to 9.6 necessary. Qs. to 1 liter.
4. 10X Substrate Buffer, pH 6.0
36.6 g Citric Acid, monohydrate
113.5 g Potassium dibasic phosphate
Dissolve in 900 ml di-H2O. Check pH and adjust to 6.0 if necessary. Qs. to 1 liter.
5. 0.3% H2O2
Dilute 30% stock Peroxide 1:100 in di-H2O.
6. OPD Stock, 4.0%
4 g OPD in 100 ml di-H2O. Aliquot and store at -20oC. Protect from light.
7. 4.5N H2SO4
12.0 ml Concentrated Sulfuric Acid
88.0 ml di-H20
B. Procedure
1. Wash ELISA plates once with di-H2O.
2. Add 250 ml/well PBS:2% BSA.
3. Incubate 1 hour at 37oC.
4. Wash 3 times with di-H2O.
5. Add 50 ml/well supe, ascites, or controls diluted in PBS:1%BSA.
6. Incubate for 2 hr at 37oC.
7. Wash 5 times with di-H2O.
8. Add 50 ml/well anti-mouse IgG:HRP diluted in PBS:1% BSA.
9. Incubate for 1 hr at 37oC.
10. Wash 5 times with di-H2O. Wash once with carbonate buffer.
11. Add 50 ml/well working substrate solution
0.5 ml 4.0% OPD
5 ml 30% H2O2
1.0 ml 10X Substrate buffer
8.5 ml di-H2O
12. Incubate for 20 minutes at room temperature.
13. Add 25 ml/well 4.5N Sulfuric Acid
14. Read A490

C. Notes
1. Test all supernatants at 1:5 dilution.
2. Test ascites at 1:100