Histological study of rat ovaries cryopreserved by vitrification or slow freezing and reimplanted in the early or late postmenopausal stage

Acta Cirurgica Brasileira

João Marcos De Meneses E Silva¹  Luiz Gonzaga Porto Pinheiro¹  José Alberto Dias Leite¹  Lígia Helena Ferreira Melo¹  Franciele Osmarini Lunardi¹  Rômulo Cesar Costa Barbosa Filho¹  Cindy Vitalino Mendonça¹ 

关键词: Cryopreservation;    Vitrification;    Ovariectomy;    Rats;   

DOI  :  10.1590/S0102-86502014000500003

来源: SciELO

【 摘 要 】

PURPOSE: To compare two rat ovary cryopreservation techniques (vitrification vs. slow freezing) and two postmenopausal stages (early vs. late) with regard to graft take.METHODS:Thirty-three Wistar rats were submitted to bilateral oophorectomy. One ovary was submitted to histological analysis while the other was cryopreserved by slow freezing or vitrification. The cryopreserved ovary was thawed and reimplanted in the greater omentum one week (early menopause) or one month (late menopause) after oophorectomy. One month after ovary reimplantation, the graft take was evaluated macroscopically and histologically.RESULTS: Six of the animals were used ascontrols and seven died. The histological findings of 20 animals included atretic follicles (n=4), primordial follicles (n=2), and corpus luteum with primordial follicles (n=3). No ovarian tissue was found in 11 animals. Vitrification resulted in a higher graft take rate than slow freezing (50% vs. 38.5%), but the difference was not statistically significant. However, the graft take rate was 9.3 times higher in the early than in the late postmenopausal stage (61.5% vs. 14.3%) (p=0.043).CONCLUSION: Vitrification was superior to slow freezing as ovarian cryopreservation technique, and grafting was significantly more successful when the ovary was reimplanted in the late postmenopausal stage.

【 授权许可】

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