Increased production of vascular endothelial growth factor by peripheral blood mononuclear cells in patients with inflammatory bowel disease.
BACKGROUND
Vascular endothelial growth factor (VEGF) is a potent angiogenic, vascular permeability-enhancing cytokine with overexpression in various pathological disorders, including tumour growth, chronic inflammation and tissue repair. Recent studies have shown significantly increased serum levels of VEGF in patients with inflammatory bowel disease. The origin of the circulating VEGF is still unknown. The present investigation examines the VEGF production by peripheral blood mononuclear cells (PBMCs) in patients with inflammatory bowel disease.


METHODS
VEGF levels were measured in culture supernatants of unstimulated PBMCs of 27 patients with inflammatory bowel disease and 10 healthy volunteers using a solid phase ELISA. In addition, VEGF serum levels were determined.


RESULTS
PBMCs of both active Crohn's disease patients (1142.6+/-483.9 pg/ml, P < 0.001, n = 12) and active ulcerative colitis patients (748.0+/-637.6 pg/ml, P = 0.006, n = 4) produced significantly higher amounts of VEGF compared with PBMCs of healthy volunteers (113.4+/-101.8 pg/ml, n = 10). In addition, there was a significantly increased VEGF production by PBMCs of patients with active disease compared with PBMCs of patients with quiescent Crohn's disease (261.6+/-254.8 pg/ml, P < 0.001, n = 7) and inactive ulcerative colitis (147.7+/-100.3 pg/ml, P = 0.02, n = 4). There was no significant difference in VEGF release between patients with inactive inflammatory bowel disease and healthy controls.


CONCLUSIONS
Significantly increased VEGF production by PBMCs was found in patients with active Crohn's disease and active ulcerative colitis. The study helps to clarify one of the origins of the significantly enhanced VEGF serum levels in patients with active inflammatory bowel disease observed in recent studies.
Griga
T
T
Department of Gastroenterology, University Hospital Bergmannsheil, Bochum, Germany.
Gutzeit
A
A
Sommerkamp
C
C
May
B
B
D000328:Adult; D000704:Analysis of Variance; D002199:Capillary Permeability; D002478:Cells, Cultured; D003093:Colitis, Ulcerative / Q000097:blood*; D003424:Crohn Disease / Q000097:blood*; D016228:Endothelial Growth Factors / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000378:metabolism*; D008222:Lymphokines / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D008297:Male; D008875:Middle Aged; D018919:Neovascularization, Physiologic; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors
D016228:Endothelial Growth Factors; D008222:Lymphokines; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors