Glutathione supplementation to University of Wisconsin solution causes endothelial dysfunction.

Abstract:

INTRODUCTION:Glutathione (GSH) is added to University of Wisconsin (UW) organ preservation solution to protect against oxidative stress. This study assesses the effect of GSH-supplementation on endothelial function in tissues subjected to cold ischaemia and compares its effects to a mono-ethyl ester equivalent (GSH-MEE) and S-nitrosated GSH (GSNO). METHODS:Rat aortic rings were stored for 1 h or 48 h in cold, hypoxic UW solution with or without GSH (3 mM), GSH-MEE (3 mM) or GSNO (100 mciroM) supplementation. Aortic rings were reoxygenated in warm Krebs solution; smooth muscle function was assessed by responses to phenylephrine (PE), and endothelial function by vasodilatation to the endothelium-dependent dilator, acetylcholine (ACh). The protective effects against oxidant-induced endothelial cell death were assessed in cultured human umbilical vein endothelial cells (HUVEC). RESULTS:Supplementation of UW with either GSH or GSH-MEE had no effect on vascular responses to PE, but smooth muscle contraction was significantly attenuated in rings incubated for 48 h with GSNO. Endothelium-dependent relaxation was significantly impaired in tissues stored under hypoxic conditions in GSH, GSH-MEE and GSNO supplemented UW solution for 1 h. However, impairment at 48 h was significantly more pronounced in GSH-treated vessels. Cultured HUVEC death was exacerbated by GSH and GSH-MEE in unstressed cells and in those stressed with a superoxide anion generator. CONCLUSIONS:GSH supplementation of UW solution exacerbates cold-ischaemia induced endothelial dysfunction. GSNO did not share the detrimental effects of GSH and promoted NO-mediated vasodilatation.

journal_name

Transpl Immunol

journal_title

Transplant immunology

authors

Tambyraja AL,Mitchell R,Driscoll PJ,Deans C,Parks RW,Rahman I,Megson IL

doi

10.1016/j.trim.2007.06.002

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

146-50

issue

2

eissn

0966-3274

issn

1878-5492

pii

S0966-3274(07)00140-2

journal_volume

18

pub_type

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