升降温速率对低温保护剂溶液结晶性质的影响

引言细胞和组织的低温保存是现代低温生物医学的重要研究内容,对于保存稀缺物种、器官移植有着重要意义。目前,成功实现低温保存的细胞和组织包括红细胞、胚胎、皮肤、精子等。卵母细胞是哺乳动物最重要的生殖细胞之一,卵母细胞低温保存对于保护濒危物种、保存优良动物品种、使人类突破生育年龄限制等方面有重大意义。卵母细

Effect of cooling and rewarming rate on crystallization of cryoprotectant solution for oocytes

When cells are cryopreserved,the morphology of cryoprotectant at crystallization and recrystallization would influence the survival rate of cells.The cryo-microscope system was used to observe the morphology of crystal and sizes of two cryoprotectants during cooling and rewarming at different speeds.It is found that crystals during cooling are smaller and less at higher speed than at lower speed,and the former is favorable for preservation of cells.When the vitrified cryoprotetant is rewarmed,crystals during recrystallization are smaller and less at higher speed than at lower speed,and the former with narrow danger zone is favorable for the survival of oocytes.Besides,high concentration of cryoprotectant is more favorable for the survivalrate of oocytes than lower concentration.