[3H]-Thymidine Incorporation Assay for Rat-1a Cells
Please find the following protocol:
[3H]-Thymidine Incorporation Assay for Rat-1a Cells
Overview:
The rate of proliferation of cells can be measured by determining the incorporation of [3H]-thymidine into cellular nucleic acids.
Procedure:
Synchronizing Cells in a Low Growth State to Make Cells Quiescent
1. Seed 500,000 cells per well in a 24-well plate in DMEM+ 10% Fetal Calf Serum.
2. Incubate cells in a 37°C incubator for 12 to 24 hr.
3. Remove the media from the wells and rinse the cells once with serum-free media (DMEM).
4. Add 1 ml of serum-free media to each well.
5. Incubate the cells for 24 hr in a 37°C humidified 5% CO2 incubator.
Stimulating cell proliferation and labeling with [3H]-Thymidine
1. Add Dynorphin or Spiradoline to a concentration in the range of 0.05 pM to 1 μM.
2. Incubate cells for 16 hr in a 37°C humidified 5% CO2 incubator.
3. Add 1 μCi of [3H]-Thymidine (NEN) to each well. For ease of manipulation, add 1 μl of Thymidine (1 μCi) to 24 μl of media . Then add this mixture to each well.
4. Incubate the cells 8 hr in a 37°C humidified 5% CO2 incubator.
Extraction of [3H]-Thymidine-labeled DNA
1. Aspirate the media from each well.
2. Wash the cells carefully with 1 ml of ice-cold PBS.
3. Aspirate PBS.
4. Add 1 ml of ice-cold 5% TCA.
5. Incubate cells at 4°C for 30 min.
6. Aspirate TCA solution and wash once with PBS.
7. At room temperature, add 0.5 ml of 0.5 M NaOH/0.5% SDS Solution.
8. Pipette the cell suspension up and down to lyse cells and add this mixture directly to scintillation vials containing Scintillation Fluid.
9. Count the vials in a scintillation counter for assessment of radioactive nucleotide incorporation.
Solutions:
PBS.............................................................................pH 7.2
.......................................................................2.7 mM KCl
.....................4.3 mM Sodium Phosphate Dibasic (Na2HPO4)
...............1.8 mM Potassium Phosphate Monobasic (KH2PO4)
....................................................................137 mM NaCl
70-90 Ci/mmole methyl-[3H]-Thymidine (NEN, 1 mCi/ml) ...............................................CAUTION! Biohazard
DMEM (Dulbecco's Modified Eagle's Medium) + 10% Fetal Calf Serum
0.5 M NaOH/0.5% SDS Solution.......................0.5% (w/v) SDS
..............................0.5 M NaOH
5% (w/v) TCA................................CAUTION! Biohazard
Bioreagents and Chemicals:
Sodium Phosphate, Dibasic
Potassium Phosphate, Monobasic
Potassium Chloride
Sodium Chloride
Sodium Hydroxide
SDS
Trichloroacetic Acid (TCA)
Scintillation Fluid
[3H]-Thymidine
Fetal Calf Serum (FCS)
DMEM
Spiradoline
Dynorphin
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