Generation of Lymphocytic Microparticles and Detection of their Proapoptotic Effect on Airway Epithelial Cells

The overall goal of this procedure is to illustrate the in vitro production of lymphocytic microparticles or LMPs from a T lymphocyte cell line, and to demonstrate their pro apoptotic effect on airway epithelial cells. This is accomplished by first producing the LMPs. Next, the isolated LMPs are characterized by fax analysis.

Then the bronchial tissue explants are cultured. Finally, LMP treatment on bronchial explants is carried out. Ultimately, histopathological examinations such as hemat, toin, and eosin and NC two cell death detection are used to show LMP induced bronchial epithelial layer damage and epithelial cell apoptosis.

The main advantage of this technique over existing methods like isolation of microparticle from human peripheral blood is that we are able to perform large scale generation of microparticle derived from a cell line in vitro action. Generally, individuals new to this method will struggle because critical steps of bronchia explan culture are not easy to prepare. To begin culture.

CEMT cells in four T 1 75 flasks each containing 150 milliliters of fresh, medium and incubate at 37 degrees Celsius to a density of 2 million cells per milliliter. Collect the cells from each flask by centrifugation at 200 times G for five minutes, and reus bend 300 times 10 to the six cells into a new T 1 75 flasks containing 150 milliliters of fresh medium. To maintain the 2 million cells per milliliter density, add 37.5 microliters of actin mycin D to the medium at a final concentration of 0.5 micrograms per milliliter and incubate at 37 degrees Celsius for 24 hours.

Transfer all the culture medium into 50 milliliter conical tubes, and spin down the cells at 750 times G for five minutes. Then transfer the supernatant into 50 milliliter conical tubes and centrifuge at 1500 times G for 15 minutes to remove large cell fragments. Next, transfer the supernatant into a 250 milliliter bottle and ultra centrifuge at 12, 000 times G for 50 minutes.

Then discard the supernatant and collect the pellets. Use 40 milliliters of sterile PBS to wash the LMP enriched pellets in a 50 milliliter tube and centrifuge at 12, 000 times G for 50 minutes. Repeat this step twice.

Collect the supernatant from the last wash to be used as a vehicle control with one milliliter of PBS. Suspend the pellets and transfer into a 1.5 milliliter sterile micro tube aliquot and store isolated LMPs at negative 80 degrees Celsius. To characterize microparticles by fax analysis, begin by preparing two samples of a nexin buffer, one with calcium chloride and one without calcium.

In a fax tube, dilute one microliter of LMPs in 44 microliters of a nexin buffer with calcium chloride. Prepare another tube using a nexin buffer without calcium chloride. Next, add five microliters of an X and V sci five to each tube and mix well incubate in the dark at room temperature for 15 minutes.

After the incubation, use 400 microliters of fax flu sheath fluid. To stop the reactions, add 10 microliters of seven micron counting beads suspension as an internal standard in each tube. To obtain an absolute count, established gates of relative size, FSCH and relative granularity SSCH and dot plot on the flow cytometer.

Using size calibrated fluorescent beads of one micrometer for gate one and counting beads at seven micrometers. For gate two, analyze the LMP sample on an F-S-C-H-S-S-C-H plot using the established gates and FL four channel for the annexin dot plot by acquiring a signal until 10, 000 counting beads are reached in gait two, determine the positive in ex NV events of LMPs in nexin buffer containing calcium chloride and subtract the events of LMPs in nexin buffer without calcium chloride. Calculate the absolute number of LMPs based on the following equation.

Uses scalpel dumont super fine tweezers and surgical scissors to aseptically, dissect lung tissue. Carefully remove the parenchyma and blood vessels. Further dissect the bronchus submerged in the tissue washing medium and separate the bronchus with a diameter of one to 2.5 millimeters from peripheral lung tissues.

Use a scalpel to slice bronchial tissues into about five millimeter thick bronchial ranks using a scooping motion with the sterile curved micro dissecting forceps. Pick up the bronchial fragments and place them onto the scratched areas of dishes previously prepared. According to the text protocol, remove the tissue washing medium and incubate fragments at room temperature for about five minutes to allow them to adhere to the dishes.

Add 10 milliliters of complete healing medium to each dish and place them in a controlled atmosphere modular incubator chamber with a high oxygen gas mixture, flush the chamber, then place it in a benchtop orbital incubator and shake it at 37 degrees Celsius for 24 hours at 10 cycles per minute to allow the medium to flow intermittently over the fragments. After the incubation, observe the tissue explan under a phase contrast and inverted light microscope. Select bronchial explan with complete fine hair movement and lively bronchial epithelium for subsequent LMP treatment.

To treat LMPs, count the bronchial explan just selected and mark each well of a 12 well tissue culture plate. For each explan transfer 0.5 milliliters of complete growth medium into a sterile einor tube. Then add 25 microliters of l and p stock per treatment explan or add 25 microliters of control vehicle.

For the control explants mix well by gently tapping the tube. Transfer the mixed medium to each well of a marked 12 well tissue culture plate with curved micro dissecting forceps. Transfer each selected bronchial x explan to each well of the tissue culture plate.

Continue the incubation in a controlled atmosphere modular incubator chamber at 37 degrees Celsius with gentle shaking after 24 hours. Use PBS to wash the EXPLAN three times and proceed to fixation h and e staining and the tunnel assay. According to the text protocol as shown here, LMPs were characterized with a nexin V staining by fax analysis and gated using one micrometer beads where 97%of mps were in nexin V sci-fi positive.

Typically, about 2.5 milligrams of LMPs were obtained Following this protocol. Bronchial tissue explan from C 57 black six mice were subjected to vehicle and LMP treatment. In this figure, histopathological analysis of bronchial sections reveals the effect of LMPs on the structural integrity of the bronchial epithelium.

In control. Explan, the bronchial epithelium was largely undamaged. However, in LMP treated explants, the superficial epithelial cell layer was damaged or lost, and there were significant decreases in epithelial cell height and density as seen here.

Tunnel positive staining a marker for apoptosis was more pronounced in LMP treated bronchial epithelium compared to control tissue. While attempting this procedure, it's important to remember to work in sterile conditions when producing microparticles and performing tissue explan culture.