To completely avoid ice crystal formation and thus get a higher survival rate, vitrification methods have been commonly used for cryopreservation of oocytes and embryos. However, currently used vitrification methods for oocytes and embryos are not suitable for the cryopreservation of preantral follicles (PFs). In the present study, stainless steel mesh was fabricated into mini mesh cups to vitr...

Background: In this study, we evaluated the incidence of apoptosis at the ultrastructural levels and expression of some apoptosis-related genes in vitrified human ovarian tissue just after warming. Methods: Human ovarian tissue biopsies from 23 women after caesarean section were transported to the laboratory within 2 hours, and then they were cut into small pieces. Some pieces were vitrified an...

Background: Ovarian tissue cryopreservation and autotransplantation is the only fertility preservation way for prepubertal girls and situations that cytotoxic treatment is urgent. Materials and Methods: The ovaries of premature (5 weeks old) rats were autografted under cervical skin after vitrification. 3 weeks later, transplanted ovaries were removed from the body and structure of ovary, expre...

Background: Cryopreservation of ovarian tissue is an important option for preserving the fertility of cancer patients undergoing chemotherapy and radiotherapy. Researchers have used different cryoprotectants and various techniques to improve the cryopreservation of ovaries However, despite significant recent progress, the efficiency of ovary cryopreservation is still low. Zinc is essential for ...

Previous studies have reported many discrepancies about the best type and concentration of cryoprotective agents (CPAs) and biological variability among various pre-antral follicle classes after cryopreservation of ovarian tissue. The aim of this study was to investigate the impacts of some synthetic polymers on histological characteristics of different types of pre-antral follicles after bovin...

STUDY QUESTION Is sucrose more effective than trehalose in human ovarian tissue cryopreservation? SUMMARY ANSWER The effect of sucrose as a cryoprotective agent (CPA) was not significantly different from that of trehalose in human ovarian tissue cryopreservation. WHAT IS KNOWN ALREADY Sugars have the ability to keep the cell membrane intact and can decrease the toxicity of CPAs. Sucrose is ...

Sir, In the challenging paper by Wang et al. (2008), the authors have reported about an effective method of vitrification of human ovarian tissue with direct contact of cells in liquid nitrogen, named needle immersed vitrification. Childbirth after cryopreservation of ovarian tissue is now a reality (Donnez et al., 2004; Demeestere et al., 2007; Meirow et al., 2007; Andersen et al., 2008) and t...