title: The natural killer activity of peritoneal fluid lymphocytes is decreased in women with endometriosis.
abstract: OBJECTIVE
  To investigate the local natural killer (NK) activity of the peritoneal fluid mononuclear cells (PFMC). DESIGN PATIENTS: In a prospective way, the NK activity (K562-assay) was measured in peripheral blood (PB) and peritoneal fluid (PF) of 44 women who underwent a laparoscopy for infertility and/or pain at the University Hospital of Gasthuisberg, Leuven, Belgium.
  
  
  METHODS
  The NK activity of peripheral blood mononuclear cells and PFMC, the number and concentration of PFMC, the percentage of lymphocytes versus macrophages by May-Grünwald-Giemsa staining and the estradiol and progesterone concentration of the PF were correlated together and with the severity of endometriosis.
  
  
  RESULTS
  We demonstrated that there is a significant NK activity in PF and that this activity is decreased in women with endometriosis. This defect was more pronounced in the follicular phase of the cycle compared with the postovulatory phase. In PB of the same 44 women, the decreased NK activity correlated with the severity of the disease. This confirms our previous report on another 34 women.
  
  
  CONCLUSIONS
  The NK activity is decreased in women with endometriosis and correlated significantly with the severity of the disease in both the PB and PF of women with endometriosis.
authors.affiliation: Rega Institute for Medical Research, University of Leuven, Belgium.
authors.forename: D J
authors.initials: DJ
authors.lastname: Oosterlynck
authors.forename: C
authors.initials: C
authors.lastname: Meuleman
authors.forename: M
authors.initials: M
authors.lastname: Waer
authors.forename: M
authors.initials: M
authors.lastname: Vandeputte
authors.forename: P R
authors.initials: PR
authors.lastname: Koninckx
mesh_terms: D001202:Ascitic Fluid / Q000473:pathology*; D004715:Endometriosis / Q000276:immunology*; D005260:Female; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology* / Q000473:pathology; D007963:Leukocytes, Mononuclear / Q000276:immunology / Q000473:pathology; D008597:Menstrual Cycle / Q000276:immunology; D011446:Prospective Studies