title: Transforming growth factor beta is increased in plasma of patients with hematologic malignancies after transfusion of platelet concentrates.
abstract: BACKGROUND
  Transforming growth factor beta 1 (TGF-beta 1) acts as a potent inhibitor of bone marrow proliferation. High concentrations were found in human platelets, which release this cytokine during storage.
  
  
  METHODS
  TGF-beta 1 levels during a storage period of 5 days were compared in the plasma of platelet concentrates prepared by apheresis or by the buffy coat method. In addition, TGF-beta 1 plasma levels were monitored in patients with hematologic malignancies before and after transfusion.
  
  
  RESULTS
  TGF-beta 1 levels in the supernatant of platelet concentrates were found to be 55 times higher than those in the plasma of healthy volunteer donors. During storage, an additional increase was observed. Accordingly, the transfusion of platelet concentrates resulted in a significant increase of plasma TGF-beta 1 levels in patients with hematologic malignancies (before transfusion: 2.2 +/- 0.5 ng/mL; after transfusion: 2.9 +/- 0.6 ng/mL), and these higher levels persisted for at least 4 hours.
  
  
  CONCLUSIONS
  Because TGF-beta 1 reduces the clonogenic capacity of hematopoetic progenitor cells, a myelosuppressive effect of platelet transfusions is suggested.
authors.affiliation: Department of Clinical Chemistry, University of Magdeburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Kunz
authors.forename: C
authors.initials: C
authors.lastname: Luley
authors.forename: M U
authors.initials: MU
authors.lastname: Heim
authors.forename: M
authors.initials: M
authors.lastname: Böck
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D019337:Hematologic Neoplasms / Q000097:blood* / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D017713:Platelet Transfusion; D016212:Transforming Growth Factor beta / Q000097:blood*
chemical_list: D016212:Transforming Growth Factor beta