title: Increased interleukin-6 levels in peritoneal fluid of infertile patients with active endometriosis.
abstract: OBJECTIVE
  Our purpose was to investigate the relationship between the levels of interleukin-6, interleukin-6 soluble receptor, and tumor necrosis factor-alpha in peritoneal fluid and the size and number of active red endometriotic lesions.
  
  
  METHODS
  In a university hospital 39 women of reproductive age underwent either laparoscopy for infertility workup or laparoscopic surgery for ovarian chocolate cysts. Peritoneal fluid was collected by laparoscopy. Active lesions, such as red flamelike lesions, glandlike lesions, and red vesicles, were scored according to the revised American Fertility Society classification system according to the size and number of active lesions. Peritoneal fluid levels of interleukin-6, interleukin-6 soluble receptor, and tumor necrosis factor-alpha levels were determined by enzyme-linked immunosorbent assays. The relationship between peritoneal fluid concentrations of interleukin-6 and tumor necrosis factor-alpha and the score of active endometriosis was investigated.
  
  
  RESULTS
  Peritoneal fluid levels of interleukin-6 and tumor necrosis factor-alpha were significantly higher in patients with endometriosis compared with patients without endometriosis. The concentrations in patients with active endometriosis increased as the size and the number of active lesions increased. Cyclic variations in interleukin-6 concentrations were seen in peritoneal fluid from patients with endometriosis; the concentrations in the secretary phase were significantly higher than those in the proliferative phase.
  
  
  CONCLUSIONS
  Increased peritoneal fluid levels of interleukin-6 in patients with active red endometriosis may relate to endometriosis-associated infertility and to the pathogenesis of endometriosis.
authors.affiliation: Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Harada
authors.forename: H
authors.initials: H
authors.lastname: Yoshioka
authors.forename: S
authors.initials: S
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Iwabe
authors.forename: Y
authors.initials: Y
authors.lastname: Onohara
authors.forename: M
authors.initials: M
authors.lastname: Tanikawa
authors.forename: N
authors.initials: N
authors.lastname: Terakawa
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000032:analysis; D001202:Ascitic Fluid / Q000276:immunology*; D004715:Endometriosis / Q000276:immunology*; D005260:Female; D006131:Growth Inhibitors / Q000032:analysis; D006801:Humans; D007247:Infertility, Female / Q000276:immunology*; D015850:Interleukin-6 / Q000032:analysis*; D018123:Receptors, Interleukin / Q000032:analysis; D019947:Receptors, Interleukin-6; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis*
chemical_list: D015703:Antigens, CD; D006131:Growth Inhibitors; D015850:Interleukin-6; D018123:Receptors, Interleukin; D019947:Receptors, Interleukin-6; D014409:Tumor Necrosis Factor-alpha