Amnion innate stem cell carried frozen active amnion particle and conditioned medium and application thereof
A technology of conditioned medium and stem cells, which is applied in the field of tissue engineering and medical wound repair, can solve the problem that it is difficult to effectively exert the dual advantages of amnion secreted active factors and amnion natural matrix at the same time, so as to improve the quality of wound repair, promote wound healing, and avoid The effect of disease spread
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Embodiment 1
[0035] Embodiment 1. Preparation of active amniotic membrane microparticles (LMAM) of the present invention
[0036] 1. Acquisition of amniotic membrane
[0037] With the approval of the Hospital Ethics Committee and the informed consent of the puerpera, fresh placental tissues from cesarean section women who were negative for hepatitis virus antibody, syphilis antibody, and HIV were selected, and the chorion was bluntly separated under sterile conditions, and the fibroblast layer and spongy layer were removed. After soaking and washing in phosphate buffered saline (PBS) containing 100 U / ml penicillin, 100 μg / ml streptomycin, and 0.25 μg / ml amphotericin for 3×15 min, the amniotic membrane was cut into pieces of 8×6 cm in size.
[0038] 2. Preparation, cryopreservation, recovery and activity determination of active amnion microparticles
[0039] Prepare amniotic membrane particles of 300-600 μm in size from 8×6 cm amniotic membrane slices with a particle skin cutter, and add 3...
Embodiment 2
[0042] Example 2. Preparation of Active Amnion Microparticle Conditioned Medium
[0043] 1. Preparation of active amnion microparticles conditioned medium (conditioned medium, CM for short)
[0044] Take out the cryopreservation tube from liquid nitrogen and place it in a 37°C water bath to fully thaw for 1 minute. After repeated washing and centrifugation with PBS for 3 times, the supernatant is removed, and the ratio of 1ml of particles: 6ml of DMEM medium is added to a six-well plate. 5%CO 2 Continue to incubate in the incubator for 48 hours, collect the supernatant, centrifuge at 1000 rpm for ten minutes, filter the supernatant through a 0.2 μm filter, and store it in a -80°C refrigerator for later use.
[0045] 2. Transwell detects the effect of CM on chemotaxis and migration of epidermal cells, fibroblasts and endothelial cells
[0046] The transwell migration chamber (Corning, USA) with a pore size of 8 μm was used to detect the chemotaxis and migration ability of CM ...
Embodiment 3
[0048] Embodiment 3. Animal experiments
[0049] Take 15 db / db diabetic mice (provided by Shanghai Xipro-Bikay Experimental Animal Co., Ltd.), male or female, routinely anesthetized with 1% sodium pentobarbital intraperitoneally, and disinfected with alcohol. A circular full-thickness skin defect wound with a diameter of 1.2 cm was made on both sides of the back of each db / db diabetic mouse, and the wounds (30) of the db / db diabetic mice were randomly divided into LMAM groups (prepared in Example 1) Active amniotic membrane microparticles group), DMAM group (decellularized amniotic membrane microparticles group, see Ji SZ, Xiao SC, Luo PF, Huang GF, Wang GY, Zhu SH, et al. An epidermal stem cells niche microenvironment created by engineered human amniotic membrane.Biomaterials2011; 32(31):7801-11) and blank control group, 10 wounds in each group.
[0050] After LMAM and DMAM were routinely thawed and revived, the supernatant was removed after repeated washing and centrifugati...
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