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Follicular development, ovulation, and corpus luteum formation in cryopreserved human ovarian tissue after xenotransplantation.

OBJECTIVE: To assess the competency of human frozen/thawed ovarian follicles matured in xenografts to form functioning corpora luteae after human chorionic gonadotropin (hCG) administration.

DESIGN: Prospective controlled animal study.

SETTING: University research laboratory.

PATIENT(S): Three women (19, 28, and 36 years) who underwent oophorectomy.

ANIMAL(S): Nineteen female severe combined immunodeficient (SCID) mice.

INTERVENTION(S): Cryopreserved human ovarian tissues were grafted into the s.c. space of bilaterally oophorectomized SCID mice. All the animals were stimulated with pregnant mare's serum gonadotropin (PMSG) for 4 weeks starting from 16 weeks after transplantation. Twelve animals were injected with hCG at the end of gonadotropin stimulation.

MAIN OUTCOME MEASURE(S): [1] The rate of grafts with growing follicles, with antral follicles, and/or with corpora luteae. [2] The histologic assessment of follicles and corpora luteae. [3] The serum progesterone and estradiol level in animals with corpus luteum in the grafts.

RESULT(S): [1] The rate of grafts with growing follicles and with corpora luteae was 33% to 100%, and 28% to 50%, respectively. [2] Corpora luteae in xenografts were all morphologically normal. [3] The progesterone levels were all above 3.0 ng/mL.

CONCLUSION(S): This study showed that the cryopreserved human ovarian follicles can be matured to a stage at which they can form functioning corpora luteae in the host animal.

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