title: Concentrations of platelet activating factor in rectal mucosa in patients with ulcerative colitis.
abstract: OBJECTIVE
  To find out if concentrations of platelet activating factor (PAF), which has been proposed as a mediator in the pathogenesis of ulcerative colitis and Crohn's disease, are increased in the rectal mucosa of patients with ulcerative colitis.
  
  
  METHODS
  Open study.
  
  
  METHODS
  University hospital, Sweden.
  
  
  METHODS
  45 Patients with ulcerative colitis (19 with active disease and 26 in remission), and 6 control patients and 11 healthy volunteers who acted as controls.
  
  
  METHODS
  Rectal biopsy.
  
  
  METHODS
  PAF content of rectal biopsy specimens.
  
  
  RESULTS
  There were no differences between the PAF content of rectal mucosa in patients with active disease (median 47 pmol/g wet weight), patients in remission (47 pmol/g), and controls (51 pmol/g). There was no correlation between PAF content and inflammation seen endoscopically or histologically. 13 Patients who had active disease were investigated on a second occasion 9 weeks later (range 7-17), when in remission having received steroids but steroid-free at that time. There was a slight but not significant trend towards lower concentrations of PAF (median 33 pmol/g) compared with their previous results, possibly as a result of treatment. PAF concentrations were significantly lower than those of a group of patients in clinically stable remission of longer duration (p < 0.05).
  
  
  CONCLUSIONS
  We did not find high concentrations of PAF in the rectal mucosa of patients with active ulcerative colitis compared with patients in remission or controls. We therefore have no evidence that PAF has an important role as a mediator in the inflammation of ulcerative colitis.
authors.affiliation: Department of Internal Medicine, Faculty of Health Sciences, Linköping University, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Almer
authors.forename: B
authors.initials: B
authors.lastname: Kald
authors.forename: L
authors.initials: L
authors.lastname: Franzén
authors.forename: M
authors.initials: M
authors.lastname: Ström
authors.forename: C
authors.initials: C
authors.lastname: Tagesson
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D003093:Colitis, Ulcerative / Q000145:classification / Q000473:pathology*; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010972:Platelet Activating Factor / Q000032:analysis*; D011351:Proctoscopy; D012007:Rectum / Q000473:pathology
chemical_list: D010972:Platelet Activating Factor