Implantation and pregnancy following in vitro fertilization and the effect of recombinant human relaxin administration in Macaca fascicularis

Biology of Reproduction
E S HayesE N Unemori

Abstract

Implantation and early pregnancy, and the potential effects of the reproductive-hormone relaxin, were examined in the cynomolgus macaque (Macaca fascicularis) following in vitro fertilization and embryo transfer. Mature oocytes were collected from regularly cycling, female cynomolgus monkeys subjected to ovarian superovulation using recombinant human FSH and hCG. Oocytes fertilized in vitro were cultured to the 4- to 8-cell stage, slow-cooled, and stored in liquid nitrogen before thawing and embryo transfer. Regularly cycling recipients were administered recombinant human relaxin or vehicle for 21 days through the peri-implantation period (Day 0 = pump implantation), during which time the thawed embryos were transferred (Day 7). Endometrial thickness and the number of gestational sacs were monitored by ultrasound at three time points (Days 7, 21, and 28). The number of days of placental sign (implantation bleeding) in pregnant females and menses in nonpregnant females were also recorded. Implantation (gestational sacs/embryo transferred) and multiple pregnancy (multiple gestations/ pregnant recipient) rates were slightly higher in relaxin-treated recipients compared to vehicle-treated recipients. Administration of relaxin was a...Continue Reading

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Methods Mentioned

BETA
biopsy
ELISA
biopsies

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