Bing Qi1, Qing-Shan Ji2, Guang-Hui Hou3, Liu Li4, Xian-Fen Cao5, Jing Wu5. 1. Department of Ophthalmology, Zhuhai People's Hospital, the Third Affiliated Hospital of Jinan University, Zhuhai 519000, Guangdong Province, China ; Department of Ophthalmology, the First Affiliated Hospital of Jinan University, Guangzhou 510632, Guangdong Province, China. 2. Department of Ophthalmology, Affiliated Anhui Provincial Hospital of Anhui Medical University, Hefei 230001, Anhui Province, China. 3. Department of Ophthalmology, Zhuhai People's Hospital, the Third Affiliated Hospital of Jinan University, Zhuhai 519000, Guangdong Province, China. 4. Department of Ophthalmology, the First Hospital of Nanchang, the Third Affiliated Hospital of Nanchang University, Nanchang 330038, Jiangxi Province, China. 5. Department of Ophthalmology, the First Affiliated Hospital of Jinan University, Guangzhou 510632, Guangdong Province, China.
Abstract
AIM: To compare conventional slow equilibrium cooling and directional freezing (DF) by gauze package for cryopreservation of human umbilical vein endothelial cells (HUVECs). METHODS: HUVECs were randomly assigned to conventional freezing (CF) and DF by gauze package group. The two groups of HUVECs were incubated with a freezing liquid consisting of 10% dimethylsulfoxide (DMSO), 60% fetal bovine serum (FBS) and 30% Dulbecco's modified Eagle's medium (DMEM) and then put into cryopreserved tubes. CF group, slow equilibrium cooling was performed with the following program: precool in 4°C for 30min, -20°C for 1h, and then immersion in -80°C refrigerator. DF group, the tubes were packaged with gauze and then directional freezing in -80°C refrigerator straightly. One month later, the vitality of HUVECs were calculated between two groups. RESULTS: There was no significant difference in the survival rate and growth curve between CF and DF groups. The DF group was significantly better than CF group in adherent rates, morphological changes and proliferative ability. CONCLUSION: In the conventional cryopreserved method, cells are slow equilibrium cooling by steps (4°C, -20°C and finally -80°C), which is a complicated and time-consuming process. But the improved DF by gauze package method is better than conventional method, for which is convenient and easy to operate.
RCT Entities:
AIM: To compare conventional slow equilibrium cooling and directional freezing (DF) by gauze package for cryopreservation of human umbilical vein endothelial cells (HUVECs). METHODS: HUVECs were randomly assigned to conventional freezing (CF) and DF by gauze package group. The two groups of HUVECs were incubated with a freezing liquid consisting of 10% dimethylsulfoxide (DMSO), 60% fetal bovine serum (FBS) and 30% Dulbecco's modified Eagle's medium (DMEM) and then put into cryopreserved tubes. CF group, slow equilibrium cooling was performed with the following program: precool in 4°C for 30min, -20°C for 1h, and then immersion in -80°C refrigerator. DF group, the tubes were packaged with gauze and then directional freezing in -80°C refrigerator straightly. One month later, the vitality of HUVECs were calculated between two groups. RESULTS: There was no significant difference in the survival rate and growth curve between CF and DF groups. The DF group was significantly better than CF group in adherent rates, morphological changes and proliferative ability. CONCLUSION: In the conventional cryopreserved method, cells are slow equilibrium cooling by steps (4°C, -20°C and finally -80°C), which is a complicated and time-consuming process. But the improved DF by gauze package method is better than conventional method, for which is convenient and easy to operate.
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