Procedure:
Short 96 well assay: EACH condition should be done in triplicate or more.
1. DAY ONE: Trypsinize one T-25 flask and add 5 ml of complete media to trypsinized cells. Centrifuge in a sterile
15 ml falcon tube at 500 rpm in the swinging bucked rotor (~400 x g) for 5 min.
2. Remove media and resuspend cells to 1.0 ml with complete media.
3. Count and record cells per ml. Remember to remove the cells aseptically when counting.
4. DILUTE the cells (cv=cv) to 75,000 cells per ml. Use complete media to dilute cells.
5. Add 100 μl of cells (7500 total cells) into each well and incubate overnight.
6. DAY TWO: Treat cells on day two with agonist, inhibitor or drug.
- If removing media, do very carefully. This is where most variation in data may occur.
- Final volume should be 100 μl per well.
7. DAY THREE: Add 20 μl of 5 mg/ml MTT to each well. Include one set of wells with MTT but no cells (control).
All should be done aseptically.
8. Incubate for 3.5 hours at 37oC in culture hood.
9. CAREFULLY Remove media. Do not disturb cells and do not rinse with PBS.
10. Add 150 μl MTT solvent.
11. Cover with tinfoil and agitate cells on orbital shaker for 15 min.
12. Read absorbance at 590 nm with a reference filter of 620 nm.