title: The relation of serum and follicular fluid leptin and ovarian steroid levels in response to induction of ovulation in in vitro fertilization cycles.
abstract: OBJECTIVE
  Leptin restores energy homeostasis and regulates appetite and body weight by communicating the energy status to the central nervous system. Although there is strong evidence that leptin affects reproduction, its role in the control of reproductive physiology is little understood.
  
  
  METHODS
  We studied leptin concentrations in the serum and follicular fluid of 65 women undergoing ovarian hyperstimulation for in vitro fertilization (IVF). Fasting serum samples were collected (1) on the 3rd day of the cycle before IVF and (2) at the time of oocyte retrieval. Serum concentrations of leptin, estradiol (E2), progesterone, FSH, LH, prolactin, total testosterone, DHEA-SO4, and TSH and follicular fluid concentrations of leptin, E2, and progesterone were measured.
  
  
  RESULTS
  Serum leptin values increased on average by 66.4% over basal leptin levels on the day of oocyte pick-up (OPU). A positive correlation between leptin increase and body mass index was observed. The serum leptin level was similar to that in follicular fluid o the day of OPU. E2 levels increased 34.5-fold with controlled ovarian hyperstimulation. There was a negative correlation between the increase in leptin levels and in E2 levels (P <0.05) and in the number of oocytes harvested (P <0.05).
  
  
  CONCLUSIONS
  The significant increase in serum leptin levels during controlled ovarian hyperstimulation indicates a possible role of leptin in reproductive function. The increase in leptin levels is negatively correlated with ovarian response evaluated by E2 production and number of oocytes retrieved. This might be due to the reduced ovarian response through negative feedback of leptin to the ovaries at high levels.
authors.affiliation: Reproductive Endocrinology and IVF Department, Zeynep Kamil Women and Children Diseases Training and Research Hospital, Bağdat Cd., No. 167/4, Selamiçeşme, Istanbul, Turkey. ahmetgurbuz2002@yahoo.com
authors.forename: Birgül
authors.initials: B
authors.lastname: Gürbüz
authors.forename: Serap
authors.initials: S
authors.lastname: Yalti
authors.forename: Cem
authors.initials: C
authors.lastname: Ficicioglu
authors.forename: Seval
authors.initials: S
authors.lastname: Taşdemir
mesh_terms: D000328:Adult; D015992:Body Mass Index; D019314:Dehydroepiandrosterone Sulfate / Q000097:blood; D004958:Estradiol / Q000032:analysis / Q000097:blood; D005260:Female; D005307:Fertilization in Vitro; D005640:Follicle Stimulating Hormone / Q000097:blood; D015571:Follicular Fluid / Q000737:chemistry*; D006728:Hormones / Q000032:analysis*; D006801:Humans; D020738:Leptin / Q000032:analysis* / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D008875:Middle Aged; D010053:Ovary / Q000737:chemistry*; D010062:Ovulation Induction; D011374:Progesterone / Q000032:analysis / Q000097:blood; D011388:Prolactin / Q000097:blood; D013739:Testosterone / Q000097:blood; D013972:Thyrotropin / Q000097:blood
chemical_list: D006728:Hormones; D020738:Leptin; D013739:Testosterone; D011374:Progesterone; D004958:Estradiol; D019314:Dehydroepiandrosterone Sulfate; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D013972:Thyrotropin