title: Influence of well defined protein source on in vitro maturation of human oocyte: human follicular fluid versus human serum albumin.
abstract: OBJECTIVE
  To compare developmental competency of immature human oocytes matured in vitro in G2 media supplemented by two different protein sources.
  
  
  METHODS
  Retrospective comparative study.
  
  
  METHODS
  University Hospital IVF program.
  
  
  METHODS
  Sixty-five consecutive women from whom at least one immature oocyte was obtained during 76 cycles of ovarian hyperstimulation and IVF.
  
  
  METHODS
  G2 media containing human follicular fluid (hFF) (from January to August 2005) or human serum albumin (HSA) (from Sep 2005 to Aug 2006) were used for in vitro maturation of immature oocytes.
  
  
  METHODS
  In vitro maturation rate of immature oocytes and their fertilization rate.
  
  
  RESULTS
  A total of 231 immature oocytes including 107 germinal vesicle (GV) stage and 124 metaphase I (MI) were cultured in vitro and then fertilized by intracytoplasmic sperm injection. The in vitro maturation rate of GV (40.6% vs. 52.0%) and MI oocytes (84.4% vs. 70.0%) and the fertilization rate in GV (76.9% vs. 48.7%) and MI oocytes (70.4% vs. 73.4%) were not different between hFF- and HSA-supplemented G2 media. The cleavage rates of embryos generated from either GV or MI were similar between the two groups, but they were seldom used in embryo transfer.
  
  
  CONCLUSIONS
  Developmental competency of immature oocytes was comparable when matured in vitro with G2 media supplemented by either hFF or HSA. Our results suggest that hFF as a protein supplement for human in vitro maturation can be replaced by highly defined HSA.
authors.affiliation: Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Gyeonggi, Korea. blasto@snubh.org
authors.forename: Byung Chul
authors.initials: BC
authors.lastname: Jee
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Han
authors.forename: Jeong Hee
authors.initials: JH
authors.lastname: Moon
authors.forename: Chang Suk
authors.initials: CS
authors.lastname: Suh
authors.forename: Seok Hyun
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000328:Adult; D018929:Cell Culture Techniques; D002478:Cells, Cultured; D003470:Culture Media / Q000737:chemistry / Q000494:pharmacology; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods; D015571:Follicular Fluid / Q000737:chemistry / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009865:Oocytes / Q000502:physiology*; D009866:Oogenesis / Q000187:drug effects*; D011247:Pregnancy; D011506:Proteins / Q000600:supply & distribution*; D012189:Retrospective Studies; D012709:Serum Albumin / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D003470:Culture Media; D011506:Proteins; D012709:Serum Albumin