title: Assessment of follicular development in cryopreserved primate ovarian tissue by xenografting: prepubertal tissues are less sensitive to the choice of cryoprotectant.
abstract: Improvements in cancer survival rates have renewed interest in the cryopreservation of ovarian tissue for fertility preservation. We used the marmoset as a non-human primate model to assess the effect of different cryoprotectives on follicular viability of prepubertal compared to adult ovarian tissue following xenografting. Cryopreservation was performed with dimethylsulfoxide (DMSO), 1,2-propanediol (PrOH), or ethylene glycol (EG) using a slow freezing protocol. Subsequently, nude mice received eight grafts per animal from the DMSO and the PrOH groups for a 4-week grafting period. Fresh, cryopreserved-thawed, and xenografted tissues were serially sectioned and evaluated for the number and morphology of follicles. In adult tissue, the percentage of morphologically normal primordial follicles significantly decreased from 41.2 ± 4.5% (fresh) to 13.6 ± 1.8 (DMSO), 9.5 ± 1.7 (PrOH), or 6.8 ± 1.0 (EG) following cryopreservation. After xenografting, the percentage of morphologically normal primordial (26.2 ± 2.5%) and primary follicles (28.1 ± 5.4%) in the DMSO group was significantly higher than that in the PrOH group (12.2 ± 3 and 5.4 ± 2.1% respectively). Proliferating cell nuclear antigen (PCNA) staining suggests the resumption of proliferative activity in all cellular compartments. In prepubertal tissues, primordial but not primary follicles display a similar sensitivity to cryopreservation, and no significant differences between DMSO and PrOH following xenografting were observed. In conclusion, DMSO shows a superior protective effect on follicular morphology compared with PrOH and EG in cryopreserved tissues. Xenografting has confirmed better efficacy of DMSO versus PrOH in adult but not in prepubertal tissues, probably owing to a greater capacity of younger animals to compensate for cryoinjury.
authors.affiliation: Department of Obstetrics and Gynecology, Campus Grosshadern LMU Munich, 81377 Munich, Germany.
authors.forename: V
authors.initials: V
authors.lastname: von Schönfeldt
authors.forename: R
authors.initials: R
authors.lastname: Chandolia
authors.forename: L
authors.initials: L
authors.lastname: Kiesel
authors.forename: E
authors.initials: E
authors.lastname: Nieschlag
authors.forename: S
authors.initials: S
authors.lastname: Schlatt
authors.forename: B
authors.initials: B
authors.lastname: Sonntag
mesh_terms: D000818:Animals; D002755:Choice Behavior; D015925:Cryopreservation; D003451:Cryoprotective Agents / Q000009:adverse effects* / Q000494:pharmacology; D004121:Dimethyl Sulfoxide / Q000009:adverse effects / Q000494:pharmacology; D004351:Drug Resistance / Q000502:physiology; D019855:Ethylene Glycol / Q000009:adverse effects / Q000494:pharmacology; D005260:Female; D006085:Graft Survival / Q000187:drug effects* / Q000502:physiology; D006080:Ovarian Follicle / Q000187:drug effects / Q000502:physiology* / Q000637:transplantation*; D010053:Ovary; D011323:Primates; D019946:Propylene Glycol / Q000009:adverse effects / Q000494:pharmacology; D012741:Sexual Maturation / Q000502:physiology*; D014183:Transplantation, Heterologous
chemical_list: D003451:Cryoprotective Agents; D019946:Propylene Glycol; D019855:Ethylene Glycol; D004121:Dimethyl Sulfoxide