title: Cellular electrophysiological and mechanical effects of celsior solution on endothelial function in resistance coronary arteries.
abstract: BACKGROUND
  We investigated a relatively new organ preservation (Celsior) solution regarding its effect on the endothelium-derived hyperpolarizing factor (EDHF)-mediated function with comparison to St. Thomas Hospital (ST) solution.
  
  
  METHODS
  The EDHF-mediated relaxation was induced by bradykinin (BK, -10 to -6.5 logM) in the presence of inhibitors of nitric oxide and prostacyclin in porcine small resistance coronary arteries, before and after incubation in ST (Group Ia, n=11), Celsior (Group Ib, n=13), or Krebs (Group Ic, control, n=12) at 4 degrees C for 4 hr. The EDHF-mediated hyperpolarization of the membrane potential of smooth muscle cells was measured by microelectrode with simultaneous relaxation after cold storage in ST (IIa, n=7), Celsior (IIb, n=6), or Krebs (IIc, control, n=6), or followed by washout with Krebs (ST: IIIa, n=6, Celsior: IIIb, n=6).
  
  
  RESULTS
  The EDHF-mediated relaxation was significantly decreased in Group Ia (56.4+/-7.2% vs. 71.2+/-5.3%, P<0.05) and Ib (44.8+/-4.9% vs. 74.7+/-3.3%, P<0.05) but not in Ic. The sensitivity to BK was also significantly decreased (Ia: -7.51+/-0.14 vs. -7.76+/-0.12 log M, P<0.05; Ib: -7.36+/-0.09 vs. -7.60+/-0.09 logM, P<0.05). The resting membrane potential was depolarized in IIa (-44.3+/-1.9 mV, n=7, P<0.05) and IIb (-33.0+/-2.2 mV, n=6, P<0.05) compared with IIc (-57.1+/-1.5 mV, n=6). The EDHF-mediated hyperpolarization decreased significantly in IIa and IIb (3.4+/-0.3 and 3.0+/-0.2 vs. 6.3+/-0.5 mV, P<0.05) and partially restored in IIIa (5.0+/-0.2 vs. 3.4+/-0.3 mV, P<0.05) and IIIb (4.1+/-0.3 vs. 3.0+/-0.2 mV, P<0.05).
  
  
  CONCLUSIONS
  Storage with Celsior and ST solutions reduces the EDHF-mediated endothelial function (hyperpolarization and associated relaxation) in porcine small resistance coronary arteries.
authors.affiliation: Department of Surgery, The Chinese University of Hong Kong, Hong Kong and Wuhan Heart Institute, Central Hospital of Wuhan, Wuhan, China.
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Dong
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: D000818:Animals; D001685:Biological Factors / Q000494:pharmacology; D001696:Biomechanical Phenomena; D001920:Bradykinin / Q000494:pharmacology; D003331:Coronary Vessels / Q000502:physiology*; D004187:Disaccharides / Q000494:pharmacology; D004573:Electrolytes / Q000494:pharmacology; D004594:Electrophysiology; D004730:Endothelium, Vascular / Q000187:drug effects / Q000502:physiology*; D005971:Glutamates / Q000494:pharmacology; D005978:Glutathione / Q000494:pharmacology; D006321:Heart / Q000187:drug effects / Q000502:physiology*; D006639:Histidine / Q000494:pharmacology; D008353:Mannitol / Q000494:pharmacology; D023421:Models, Animal; D009131:Muscle, Smooth, Vascular / Q000502:physiology; D009569:Nitric Oxide / Q000037:antagonists & inhibitors; D019188:Organ Preservation Solutions; D013552:Swine
chemical_list: D001685:Biological Factors; C088453:Celsior; D004187:Disaccharides; D004573:Electrolytes; D005971:Glutamates; D019188:Organ Preservation Solutions; C067410:endothelium-dependent hyperpolarization factor; D009569:Nitric Oxide; D008353:Mannitol; D006639:Histidine; D005978:Glutathione; D001920:Bradykinin