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Preparation and dilution: prepare 100 ml of double antibody (add 5 ml saline to 5 ml streptomycin, shake well, then add 5 ml saline to the penicillin vial to dissolve, transfer all 5 ml to 95 ml saline, and divide into 10 vials). Prepare 100 ml DMEM culture solution containing 15% fetal bovine serum (85 ml DMEM, 15 ml fetal bovine serum, and 1 ml double antibody), and prepare 10 ml 0.1% collagenase I (10 mg collagenase I dissolved in 10 ml PBS). The solution is usually prepared in advance and filtered through a 0.22 pore filter
Irradiation with UV light for 20-30 min (2 culture flasks, 2 15 ml centrifuge tubes, and 4 lunch boxes were placed on the UV table)
SD mice immersed in 75% alcohol (5~10 min)
Add two drops of medium (DMEM + serum + double antibodies) to one vial of medium, and leave the other vial of medium undisturbed and screwed to one side of the ultrathin table (note: this step can be performed with a 50 ml pipette)
Take another dropper with a straight tip, rinse it, insert PBS, then remove the round container set, and add the appropriate amount of PBS
Take the heart. Six milk mice can be sewn sequentially onto a plastic foam plate using a broad-headed needle, and then open the chest sequentially using scissors to reveal the heart. Take another knife and forceps, lift the heart, cut it out, place it in a round dish with prechilled PBS, rinse the heart 2 times with PBS, and cut it out (1 mm × 1 mm × 1 mm)
Remove the drop and aspirate the PBS; then take the penicillin vial and transfer the excised myocardial tissue into the penicillin vial into the penicillin vial. Add 2 drops of collagenase I (approximately 3 ml) to the penicillin vial with dropper. After 10 minutes, add collagenase I (approximately 3 ml) to the dropper vial, close tightly, and leave for 10 minutes in a water bath at 37°C. After 10 minutes, add the digestion solution to the centrifuge tube with DMEM to complete the digestion
Centrifugation (room temperature, 1000 rpm, 10 min/time)
Through a 200-mesh sieve, after centrifugation, discard the supernatant, and use the medium in a third tube to resuspend the cells. After centrifugation, discard the supernatant, resuspend the cell pellet with the medium in the third centrifuge tube, take another set of round dishes, pass the cell suspension through a 200-mesh sieve, and then collect the sieved cells