Rat oocytes fertilized in modified rat 1-cell embryo culture medium containing a high sodium chloride concentration and bovine serum albumin maintain developmental ability to the blastocyst stage

She Hoon Oh, Kazuchika Miyoshi, Hiroaki Funahashi

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82 Citations (Scopus)

Abstract

A suitable chemically defined culture medium for 1-cell rat embryos (mR1ECM) was modified to obtain sperm penetration, and the developmental competence of oocytes fertilized in the medium was compared to that of oocytes fertilized in a traditional medium, modified Krebs-Ringer bicarbonate medium (mKRB). Sperm penetration was not observed when polyvinyl alcohol was replaced with BSA in mR1ECM (mR1ECM-BSA); the incidence was improved only when the osmolarity in mR1ECM-BSA was increased to that in mKRB (310 mOsm) by addition of NaCl. The proportion of oocytes penetrated in mR1ECM-BSA with NaCl increased (71.6 ± 6.9%), which was not different compared to that in mKRB (76.7 ± 13.7%). High incidences of sperm penetration (88.8 ± 4.1% to 93.1 ± 5.1%) were also observed when NaCl concentration in mR1ECM-BSA was increased from 76,7 mM to 100-130 mM. The incidence of embryos developing to the morula and blastocyst stages was higher when fertilized in mR1ECM-BSA containing 110-130 mM NaCl (91-94%) than in mKRB (70%). A total of 5 offspring were obtained after transfer of the morulae and blastocysts (69 embryos/7 females). These results demonstrate that a high developmental ability of rat embryos to the blastocyst stage is attained when the embryos have been fertilized in mR1ECM-BSA containing 110-130 mM NaCl and then cultured in mR1ECM.

Original languageEnglish
Pages (from-to)884-889
Number of pages6
JournalBiology of reproduction
Volume59
Issue number4
DOIs
Publication statusPublished - Oct 1 1998

ASJC Scopus subject areas

  • Reproductive Medicine
  • Cell Biology

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