title: Increased adhesion of lymphoid cells to glycated proteins.
abstract: OBJECTIVE
  The advanced glycation end-products are involved in the pathogenesis of vascular damages and other clinical complications in diabetic patients. The aim of this study was to investigate the adhesion of lymphoid cells to nonenzymatically glycated proteins in comparison with the unmodified substances.
  
  
  METHODS
  Two cell lines (monocyte-macrophage line U937 and the T-cell line Jurkat) were used throughout the experiments. The cells were left to adhere to nonenzymatically glycated and native proteins coated on a 96-well flat-bottom plates and the cellular adhesion was registered as absorption at 550 nm following the method described by Ivanov and Kyurkchiev [G. Ivanov, S. Kyurkchiev, Effect of advanced glycosylation end-products on the activity of integrins expressed on U937 cells, Hum. Immunol. 59 (1998) 325-330.].
  
  
  RESULTS
  It was found that the monocytes had increased adhesion to nonenzymatically glycated proteins such as collagen, fibronectin and bovine serum albumin, whereas the T-cells had increased adhesion to the glycated collagen and bovine serum albumin but reduced adhesion to advanced glycated fibronectin. Experiments with different stimulating agents showed that phorbol-myriastate, acetate (A550 = 0.672 +/- 0.068, S.E.M., n = 40), glucose (A550 = 0.593 +/- 0.051, S.E.M., n = 40) and TNF-alpha (A550 = 0.580 +/- 0.042, S.E.M., n = 40) increased the adhesion of U937 cells to advanced glycated bovine serum albumin in comparison with the adhesion of the untreated cells (A550 = 0.260 +/- 0.046, S.E.M., n = 40). This is probably due to an upregulation of the expression or the activity of the receptors for the advanced glycation end-products.
  
  
  CONCLUSIONS
  Based on the results obtained it is concluded that the receptors for nonenzymatically glycated proteins expressed on the surface of lymphoid cells could act also as cell adhesion molecules.
authors.affiliation: Department of Molecular Immunology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
authors.forename: G I
authors.initials: GI
authors.lastname: Ivanov
authors.forename: T A
authors.initials: TA
authors.lastname: Chaushev
authors.forename: L N
authors.initials: LN
authors.lastname: Dakovska
authors.forename: S D
authors.initials: SD
authors.lastname: Kyurkchiev
mesh_terms: D000818:Animals; D002417:Cattle; D002448:Cell Adhesion / Q000187:drug effects / Q000502:physiology*; D003920:Diabetes Mellitus / Q000378:metabolism / Q000473:pathology; D003925:Diabetic Angiopathies / Q000209:etiology; D017127:Glycation End Products, Advanced / Q000378:metabolism; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D019169:Jurkat Cells; D008214:Lymphocytes / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D009000:Monocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic / Q000378:metabolism; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D020298:U937 Cells
chemical_list: D017127:Glycation End Products, Advanced; D006023:Glycoproteins; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic; D013755:Tetradecanoylphorbol Acetate