Objective: The aim of the study was to observe and compare the effects of cryopreservation and thawing meth- ods on rat ovarian tissues. Methods: Twenty 5-6 weeks old SPF-SD female rats were randomly divided into two ...Objective: The aim of the study was to observe and compare the effects of cryopreservation and thawing meth- ods on rat ovarian tissues. Methods: Twenty 5-6 weeks old SPF-SD female rats were randomly divided into two groups, with ten rats in each group. Freshly isolated ovaries saved as a control (group 1: fresh ovaries) in formalin-fixed or vitrified immediately after dissection (group 2: vitrified ovaries). Ovaries in vitrified group were processed into thin slices then cryo- preserved, stored in liquid nitrogen for 21 days, rapidly thawed and grossly examined. All of the collected ovaries underwent hematoxylin and eosin-stained paraffin serial sections and observed the microscopic evaluation in vitrified ovaries. Results: Grossly the vitrified ovaries turned pale color and the size was same as before freeze. The vitrified ovarian tissue had normal anatomical structures of cortex and medulla under the microscope and had no difference with the fresh control ovarian tis- sue. The number and distribution of the follicles were similar with the fresh ovarian tissue, but had smaller size and the gap between oocyte and the surrounding granulosa cells was increased. Few ooctyes were in irregular appearance however the morphology of follicular cells did not give a different appearance as compared to the fresh control ovarian tissue. Conclusion: Cryopreservation of ovarian tissues by vitrification method has some detrimental effect on the morphology of follicles but does not induce negative impact on the number, density and survival of the primordial ovarian follicles. However the whole follicle anatomical structures also had no significant changes.展开更多
Objective： The aim of our study was to observe the survival and morphological changes of thawed ovarian tis- sues after heterotopic transplantation. Methods： Twenty SPF-SD female rats （5-6 weeks old） were equally ...Objective： The aim of our study was to observe the survival and morphological changes of thawed ovarian tis- sues after heterotopic transplantation. Methods： Twenty SPF-SD female rats （5-6 weeks old） were equally randomized into the control group and experimental group. In control group, the freshly isolated ovaries were fixed in formalin. In experimental group, the freshly isolated ovaries were vitrified immediately and cut into thin slices. After stored in liquid nitrogen for 21 days, the tissues of experimental group were rapidly thawed and transplanted into back muscles of rats for 2 or 4 weeks, respectively. After that, all rats in experimental group were sacrificed and the ovarian tissues were collected and fixed in 4% formaldehyde solution. Then the ovarian tissues were stained with HE and observed under the light confocal microscope. Re- suits： With the naked eyes, there was no specific alteration except the size reduction with color changing. Under microscopy, we found normal cortex and medulla in the ovary, and the primordial follicles and follicles in various stages were observed in the cortex. The normal oocytes in ovarian tissues of experimental group were significant decreased than in the control group. Conclusion： The ovarian tissues survive well in experimental group and there is no significant difference in the proportion of follicles between different times （2 and 4 weeks） after grafting. Our results suggest that thawed ovarian tissues could survive after heterotopic transplantation into back muscles of rat models and maintain their morphology and function.展开更多
文摘Objective: The aim of the study was to observe and compare the effects of cryopreservation and thawing meth- ods on rat ovarian tissues. Methods: Twenty 5-6 weeks old SPF-SD female rats were randomly divided into two groups, with ten rats in each group. Freshly isolated ovaries saved as a control (group 1: fresh ovaries) in formalin-fixed or vitrified immediately after dissection (group 2: vitrified ovaries). Ovaries in vitrified group were processed into thin slices then cryo- preserved, stored in liquid nitrogen for 21 days, rapidly thawed and grossly examined. All of the collected ovaries underwent hematoxylin and eosin-stained paraffin serial sections and observed the microscopic evaluation in vitrified ovaries. Results: Grossly the vitrified ovaries turned pale color and the size was same as before freeze. The vitrified ovarian tissue had normal anatomical structures of cortex and medulla under the microscope and had no difference with the fresh control ovarian tis- sue. The number and distribution of the follicles were similar with the fresh ovarian tissue, but had smaller size and the gap between oocyte and the surrounding granulosa cells was increased. Few ooctyes were in irregular appearance however the morphology of follicular cells did not give a different appearance as compared to the fresh control ovarian tissue. Conclusion: Cryopreservation of ovarian tissues by vitrification method has some detrimental effect on the morphology of follicles but does not induce negative impact on the number, density and survival of the primordial ovarian follicles. However the whole follicle anatomical structures also had no significant changes.
文摘Objective： The aim of our study was to observe the survival and morphological changes of thawed ovarian tis- sues after heterotopic transplantation. Methods： Twenty SPF-SD female rats （5-6 weeks old） were equally randomized into the control group and experimental group. In control group, the freshly isolated ovaries were fixed in formalin. In experimental group, the freshly isolated ovaries were vitrified immediately and cut into thin slices. After stored in liquid nitrogen for 21 days, the tissues of experimental group were rapidly thawed and transplanted into back muscles of rats for 2 or 4 weeks, respectively. After that, all rats in experimental group were sacrificed and the ovarian tissues were collected and fixed in 4% formaldehyde solution. Then the ovarian tissues were stained with HE and observed under the light confocal microscope. Re- suits： With the naked eyes, there was no specific alteration except the size reduction with color changing. Under microscopy, we found normal cortex and medulla in the ovary, and the primordial follicles and follicles in various stages were observed in the cortex. The normal oocytes in ovarian tissues of experimental group were significant decreased than in the control group. Conclusion： The ovarian tissues survive well in experimental group and there is no significant difference in the proportion of follicles between different times （2 and 4 weeks） after grafting. Our results suggest that thawed ovarian tissues could survive after heterotopic transplantation into back muscles of rat models and maintain their morphology and function.
