Abstract:
BACKGROUND:Vascular endothelial growth factor (VEGF) is a potent endothelial cell growth and permeability factor, expressed in the lung. Overexpression of VEGF is associated with increased vascular permeability in the early stage of acute lung injury in mice. The role of various forms of VEGF in transplantation-induced lung injury is not well understood. METHODS:VEGF mRNA and protein expression was measured in biopsies of preserved donor lung grafts as well as in control lung biopsies, using real-time reverse transcriptase-polymerase chain reaction and Western blot analysis. VEGF tissue expression was also evaluated by immunocytochemistry. Serum VEGF was measured in recipients after transplantation and in controls using ELISA. RESULTS:Although VEGF-A and VEGF-C protein expression was up-regulated, their mRNA levels were decreased in donor versus control lung biopsies (P<0.05). VEGF-B mRNA was decreased, but its protein level was unchanged in donors. Flt-1 was unchanged, KDR gene expression was down-regulated in donors (P<0.05), and both receptors' protein expression was under the detection level in donor and control lungs. VEGF-A was detected in pulmonary vessels and bronchi, whereas VEGF-C was only detectable in vessels of both donor and control lungs. After transplantation, serum VEGF increased (P<0.05) and returned to control baseline levels 12 weeks after surgery. Wet-to-dry lung weight was increased in donor versus control lungs. CONCLUSIONS:These results indicate that unventilated hypoxia increases vascular permeability in lung grafts and that this process is mainly regulated at VEGF-A and VEGF-C translational but not transcriptional level. Selective VEGF antagonism during graft preservation might be of benefit to counteract edema formation.
journal_name
Transplantationjournal_title
Transplantationauthors
Abraham D,Taghavi S,Riml P,Paulus P,Hofmann M,Baumann C,Kocher A,Klepetko W,Aharinejad Sdoi
10.1097/00007890-200206150-00003subject
Has Abstractpub_date
2002-06-15 00:00:00pages
1703-6issue
11eissn
0041-1337issn
1534-6080journal_volume
73pub_type
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