title: Impaired endothelium-derived hyperpolarizing factor-mediated relaxation in porcine pulmonary microarteries after cold storage with Euro-Collins and University of Wisconsin solutions.
abstract: BACKGROUND
  Endothelium plays an important role in mediating the function of transplanted organs. The widely used University of Wisconsin solution impairs the endothelium-derived hyperpolarizing factor-mediated relaxation in coronary arteries, but little is known about effects of lung preservation on endothelium-derived hyperpolarizing factor-mediated endothelial function. This study examined the effect of organ preservation solutions on the endothelium-derived hyperpolarizing factor-mediated relaxation in the pulmonary microarteries (diameter 200 to 450 microm).
  
  
  METHODS
  Two segments (1 as control) from the same microartery were allocated in 2 chambers of a myograph. After incubation with hyperkalemia (potassium 115 mmol/L), University of Wisconsin, or Euro-Collins solution (at 4 degrees C for 4 hours), the endothelium-derived hyperpolarizing factor-mediated relaxation was induced by bradykinin (-10 to -6.5 log M, n = 8) or calcium ionophore (A(23187), -9 to -5.5 log M, n = 7) in U(46619) (-7.5 log M) precontracted rings in the presence of indomethacin (7 micromol/L), N(G)-nitro-L-arginine (300 micromol/L), and oxyhemoglobin (20 micromol/L).
  
  
  RESULTS
  Exposure to hyperkalemia and storage with Euro-Collins or University of Wisconsin solution significantly decreased the relaxation to bradykinin (51.9 +/- 8.4% vs 60.3 +/- 6.1%, P =.02 or 49.3 +/- 7.3% vs 65.2 +/- 3.5%, P =.04) or A(23187) (12.5 +/- 0.02% vs 33.8 +/- 0.07%, P =.02 or 13.2 +/- 0.03% vs 31.0 +/- 0.05%, P =.03%).
  
  
  CONCLUSIONS
  Endothelium-derived hyperpolarizing factor plays an important role in porcine pulmonary microarteries, and the endothelium-derived hyperpolarizing factor-mediated relaxation is impaired when the lung is preserved with University of Wisconsin or Euro-Collins solution. This impairment may affect the lung function during the reperfusion period after lung transplantation.
authors.affiliation: Department of Surgery, The Chinese University of Hong Kong, SAR, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zou
authors.forename: Qin
authors.initials: Q
authors.lastname: Yang
authors.forename: Anthony P C
authors.initials: AP
authors.lastname: Yim
authors.forename: Guo-Wei
authors.initials: GW
authors.lastname: He
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid / Q000494:pharmacology; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D001920:Bradykinin / Q000494:pharmacology; D000001:Calcimycin / Q000494:pharmacology; D003080:Cold Temperature; D004305:Dose-Response Relationship, Drug; D004730:Endothelium, Vascular / Q000187:drug effects / Q000502:physiology; D006947:Hyperkalemia; D006982:Hypertonic Solutions / Q000494:pharmacology*; D007476:Ionophores / Q000494:pharmacology; D008168:Lung; D023421:Models, Animal; D008955:Models, Cardiovascular; D009119:Muscle Contraction / Q000187:drug effects / Q000502:physiology; D009569:Nitric Oxide / Q000494:pharmacology*; D019188:Organ Preservation Solutions / Q000494:pharmacology*; D011651:Pulmonary Artery / Q000187:drug effects* / Q000502:physiology*; D013552:Swine; D014662:Vasoconstrictor Agents / Q000494:pharmacology; D014664:Vasodilation / Q000187:drug effects* / Q000502:physiology*; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: C037096:Euro-Collins' solution; D006982:Hypertonic Solutions; D007476:Ionophores; D019188:Organ Preservation Solutions; D014662:Vasoconstrictor Agents; D014665:Vasodilator Agents; D009569:Nitric Oxide; D000001:Calcimycin; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D001920:Bradykinin