title: Effects of ovarian source, patient age, and menstrual cycle phase on in vitro maturation of immature human oocytes.
abstract: OBJECTIVE
  To determine the efficiency of in vitro maturation, expressed by nuclear maturation, of oocytes aspirated during gynecologic surgeries or collected from excised ovaries. To assess the effect of patient age and cycle phase at collection on the oocyte's ability to mature in vitro. To examine the time course of oocyte maturation in vitro.
  
  
  METHODS
  Nuclear maturation based on patient criteria compared.
  
  
  METHODS
  University-based IVF program and research center.
  
  
  METHODS
  Consented patients undergoing gynecologic surgeries or patients undergoing oophorectomy.
  
  
  METHODS
  Oocytes were maintained in culture for 48 hours and evaluated for maturation.
  
  
  METHODS
  Nuclear maturation evaluated as germinal vesicle breakdown (GVBD) or progression to the metaphase II (MII) stage.
  
  
  RESULTS
  A significantly higher percentage of oocytes collected during the follicular phase of the menstrual cycle underwent GVBD than did oocytes collected during the luteal phase (60% versus 48%, respectively). The percentage of oocytes reaching the MII stage, from these two groups, was not different. No statistically significant differences in maturation were observed in oocytes from different ovarian sources or from patients >40 or <40 years of age.
  
  
  CONCLUSIONS
  These data suggest that oocytes collected during the follicular phase are more likely to undergo GVBD than oocytes collected during the luteal phase. In this study, ovarian source, age, or cycle phase did not influence the final meiotic maturation of oocytes to metaphase II.
authors.affiliation: Department of Obstetrics and Gynecology, The Ohio State University, Columbus 43210, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Whitacre
authors.forename: D B
authors.initials: DB
authors.lastname: Seifer
authors.forename: C I
authors.initials: CI
authors.lastname: Friedman
authors.forename: S
authors.initials: S
authors.lastname: Coskun
authors.forename: E A
authors.initials: EA
authors.lastname: Kennard
authors.forename: M H
authors.initials: MH
authors.lastname: Kim
authors.forename: B M
authors.initials: BM
authors.lastname: Alak
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology*; D002453:Cell Cycle / Q000502:physiology; D002467:Cell Nucleus / Q000502:physiology; D002478:Cells, Cultured; D016922:Cellular Senescence / Q000502:physiology*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology*; D009865:Oocytes / Q000502:physiology* / Q000648:ultrastructure; D010053:Ovary / Q000502:physiology*