title: Improvement of pregnancy rate by intrauterine administration of dexamethasone and recombinant human leukemia inhibitory factor at the time of embryo transfer in cattle.
abstract: Bovine embryos (day 5) were cultured to day 10 with or without 100 ng/mL PGF2α in medium supplemented with control; 100 nM Dex; 1,000 U/mL recombinant human leukemia inhibitory factor (rhLIF); or Dex+rhLIF. Although the rates to development to the blastocyst were not significantly different among groups, the hatching rate after additional culture with Dex +/or rhLIF was significantly higher in all supplemented groups than the control (p< 0.05). In the presence of PGF2α, the hatching rate was significantly restored in all supplemented groups relative to the group treated with only PGF2α and the control (p< 0.05). Embryo transfer (ET) was performed with blastocysts (day 7). PGF2α levels of control recipient cows were significantly higher in the circulatory blood samples collected 60 min after ET than in samples collected 60 min before ET (p< 0.005), and were decreased in cows injected with loading medium supplemented with Dex+rhLIF (p< 0.005). Pregnancy rate was significantly higher in the ET group that received supplemented embryo-loading medium than in the non-supplemented control (p< 0.05). The intrauterine administration of Dex and rhLIF at ET prevented increased PGF2α in circulatory blood and resulted in enhanced pregnancy rate.
authors.affiliation: School of Dentistry and Dental Research Institute, Seoul National University, Seoul 03080, Korea.
authors.forename: Sangho
authors.initials: S
authors.lastname: Roh
authors.affiliation: School of Dentistry and Dental Research Institute, Seoul National University, Seoul 03080, Korea.
authors.forename: Se-Woong
authors.initials: SW
authors.lastname: Kim
authors.affiliation: ETbiotech Ltd., Damyang 57344, Korea.
authors.forename: Yeon-Gil
authors.initials: YG
authors.lastname: Jung
authors.affiliation: Department of Theriogenology, College of Veterinary Medicine, Konkuk University, Seoul 05029, Korea.
authors.forename: Jong-Im
authors.initials: JI
authors.lastname: Park
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D003907:Dexamethasone / Q000494:pharmacology*; D015237:Dinoprost / Q000378:metabolism*; D004624:Embryo Transfer / Q000662:veterinary; D005260:Female; D005938:Glucocorticoids / Q000494:pharmacology*; D053605:Leukemia Inhibitory Factor / Q000494:pharmacology*; D011247:Pregnancy; D018873:Pregnancy Rate; D012098:Reproduction / Q000187:drug effects
chemical_list: D005938:Glucocorticoids; C507837:LIF protein, human; D053605:Leukemia Inhibitory Factor; D003907:Dexamethasone; D015237:Dinoprost
keywords: bovine; embryo transfer; fertilization in vitro; pregnancy rate; prostaglandins F