In Vitro Differentiation of Naive CD4⁺ T Cells into Pathogenic Th17 Cells in Mouse

Our research objective is to target the directed differentiation of TH17 cells, and we aim to explore a simple method for retro deflation of TH17 cells, which serves as a traditional condition for retro experiments related to some disease associated to TH17 cells. Many studies have mentioned the methods for winter induction of TH17 cells, and the recent research has focused on small molecular inhibitors and other STEM line. However, the picture of in which induction of almost all studies has not been stable above 50%Many new techniques have been applied to the screen and the salivation of TH17 cells, such as flow cytometry, sorting of TH17 cells, and magnetic bead sorting for TH17 cells, So the key point is that we found a simple method to induce TH17 cell differentiation by adding different concentrations of STAs to the medium and its differentiation purity can be close to 90%Our laboratory we are studying the changes in the immune microenvironment, in insert diseases models, including the change in immune cells and the correction of immune imbalance and so on.

To begin, place the euthanized mouse in a supine position on the clean bench. Cut along the midline of the mouse abdomen and separate the abdominal structures layer by layer. Using tweezers gently open the greater mentum and stomach.

Then gently pull out the spleen with the gastro splenic ligament and bluntly separate it from surrounding tissues and ligaments To obtain an intact spleen, place a 70 micron cell filter in a 100 millimeter sterile culture dish. Add the spleen to the cell strainer and crush it with a syringe plunger. Add five to eight milliliters of homogenate flushing fluid to push the splenic cells through the filter into the culture dish.

Centrifuge the filtrate at 450 G for five minutes at room temperature and discard the supernatant. Re suspend the pellet with the sample diluent provided with the lymphocyte separation kit. After counting the cells on a hemo cytometer, adjust the cell concentration to two times 10 to the power of eight cells per milliliter.

In a centrifuge tube take the same amount of lymphocyte separation solution as the tissue single cell suspension. Carefully pipette the single cell suspension onto the surface of the lymphocyte separation solution and centrifuge at 800 G for 30 minutes at 25 degrees Celsius. After centrifugation, observe the four layers in the tube from top to bottom.

Using a pipette, carefully draw the annular milky white lymphocyte layer into another tube. Add 10 milliliters of cleaning solution to the tube to mix the cells. Centrifuge the cell suspension at 250 G four five minutes.

Discard the supernatant and resuspend the pellet in 10 milliliters of RPMI 1640 medium for cell counting. To begin, prepare a mouse splenic single cell suspension with one times 10 to the power of eight cells per milliliter. In a volume of 0.1 to two milliliters, add 50 microliters of rat serum to the sample.

Transfer the sample to a five milliliter polystyrene round bottom tube. Add 50 microliters of isolation cocktail to the sample. Mix well and incubate for 7.5 minutes at room temperature.

Now add 50 microliters per milliliter of depletion cocktail. Mix well and incubate for 2.5 minutes. Meanwhile, vortex the magnetic beads to ensure even dispersion.

Add 75 microliters of the magnetic beads to the sample. Mix well and incubate for 2.5 minutes. Top up the sample with RPMI 1640 medium to a final volume of 2.5 milliliters and mix several times.

Then place the tube into the magnet for 2.5 minutes. Pick up the magnet and invert it with the tube in one continuous motion. Pouring the enriched cell suspension into a new tube.

Determine the cell number using a hemo cytometer. Perform flow cytometric analysis for naive CD4+T-Cells before and after isolation. After gating, transfer the cell suspension to a new centrifuge tube.

Centrifuge at 400 G for five minutes and discard the supernatant. Resuspend the pellet in 200 to 500 microliters of RPMI 1640 medium supplemented with 10%FBS. For each one milliliter of cell culture, add two microliters of leukocyte activation cocktail and mix.

Culture the cells in a carbon dioxide incubator at 37 degrees celsius with saturated humidity for four to six hours. To begin, remove the PBS from the pre-coded 24 well plate. Resuspend the enriched mouse splenic naive CD4+T-cells in TH17 cell culture medium and dispense into different wells of a 24 well plate pre-coded with anti CD3.

Add TH0 cell culture medium classical non-pathogenic TH17 culture medium and classical pathogenic TH17 culture medium for contrast into the remaining wells of the plate. Add one microliter of ant CD 28 solution to each well. Culture the cells in a 5%carbon dioxide incubator at 37 degrees Celsius for five days.

On day two, replace half of the cell culture supernatant medium with fresh culture medium. Observe the cells under an optical microscope on day five. Collect the cell supernatants from each group and cryopreserve them at minus 80 degrees Celsius.

Naive CD4+T-cells were cultured with TH0 medium and TH17 differentiation medium for five days resulting in T cells showing cluster growth in both media. Flow cytometry analysis revealed that 90%of naive CD4+T-cells successfully differentiated into pathogenic TH17 cells under the stimulation of a new TH17 cell culture medium.