title: Suppression of natural killer cell activity by sera from patients with endometriosis.
abstract: OBJECTIVE
  We determined the effect of sera from patients who have endometriosis on natural killer cell activity.
  
  
  METHODS
  The natural killer cell activity of lymphocytes from healthy volunteers was examined after incubation with sera from patients who had endometriosis or from controls, with K562 cells used as targets.
  
  
  RESULTS
  Lymphocytes treated with sera from patients who had endometriosis expressed significantly lower levels of cytotoxicity compared with lymphocytes treated with control sera. This suppression of cytotoxicity was dose dependent, and the degree of suppression was proportional to the incubation time of the effector cells with the sera. Decreased cytotoxicity after serum treatment was also observed with sera from patients who had been treated with danazol.
  
  
  CONCLUSIONS
  These findings show that humoral factors that can inhibit natural killer cell activity in vitro are present in the peripheral blood of patients who have endometriosis; moreover, they suggest that the suppressed natural killer cell activity may allow the development of endometrial cells at ectopic sites.
authors.affiliation: Department of Gynecology and Obstetrics, Faculty of Medicine, Kyoto University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kanzaki
authors.forename: H S
authors.initials: HS
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Kariya
authors.forename: T
authors.initials: T
authors.lastname: Mori
mesh_terms: D003602:Cytotoxicity, Immunologic; D003613:Danazol / Q000627:therapeutic use; D004715:Endometriosis / Q000188:drug therapy / Q000276:immunology*; D005260:Female; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D008297:Male
chemical_list: D003613:Danazol