title: Endothelium derived relaxing factor release from canine coronary artery by leukocytes.
abstract: Lectins, known to recognize endothelial cell adhesion molecules, have been shown to release endothelium-derived relaxing factor (EDRF) from blood vessels. We investigated the effects of different leukocyte-type cells to determine if these cells, by interacting with the endothelium, could release EDRF from the circumflex branch of the canine coronary artery. The following cells were investigated: human promyelocytic leukemia (HL-60), human monocyte (THP-1), and human Burkitt lymphoma (DAUDI). All of these cells produced a significant endothelium-dependent relaxation of the dog coronary artery in the presence of ibuprofen. The endothelium-dependent relaxations were reversed by hemoglobin (10 microM), methylene blue (3 microM), 6-anilino-5,8-quinolinedione (LY 83583, 30 microM), and NG-nitro-L-arginine methyl ester (L-NAME, 1 mM). HL-60 cells grown in the presence of 1 mM L-NAME retained their ability to cause endothelium-dependent relaxation of the canine coronary artery, suggesting that the source of the NO was the endothelium and not the HL-60 cells. The cell-induced vascular relaxation could be obtained in the absence of extracellular calcium. It is suggested that HL-60, THP-1, and DAUDI cells interact with a specific receptor on the endothelial cell and as a result of this interaction the endothelial cells are stimulated to release EDRF.
authors.affiliation: Berlex Biosciences, Richmond, CA 94804-0099, USA.
authors.forename: J F
authors.initials: JF
authors.lastname: Kleha
authors.forename: P
authors.initials: P
authors.lastname: Devesly
authors.forename: A
authors.initials: A
authors.lastname: Johns
mesh_terms: D000634:Aminoquinolines / Q000494:pharmacology; D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives / Q000494:pharmacology; D003331:Coronary Vessels / Q000166:cytology / Q000378:metabolism*; D004285:Dogs; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D006801:Humans; D066298:In Vitro Techniques; D007962:Leukocytes / Q000378:metabolism*; D008751:Methylene Blue / Q000494:pharmacology; D019331:NG-Nitroarginine Methyl Ester; D009569:Nitric Oxide / Q000037:antagonists & inhibitors / Q000378:metabolism*; D013189:SRS-A / Q000037:antagonists & inhibitors; D014407:Tumor Cells, Cultured
chemical_list: D000634:Aminoquinolines; D013189:SRS-A; D009569:Nitric Oxide; C041715:6-anilino-5,8-quinolinedione; D001120:Arginine; D008751:Methylene Blue; D019331:NG-Nitroarginine Methyl Ester