Abstract
Human thyrocytes produce vascular endothelial growth factor (VEGF), a potent angiogenic factor, also known as vascular permeability factor (VPF), which increases vascular permeability. Based on the assumption that VEGF/VPF is involved in fluid accumulation in thyroid cysts, we determined the VEGF/VPF concentration in cyst fluids of thyroid nodules from 79 patients. VEGF/VPF was found to be abundantly present in the cyst fluids (0.02-183 ng/mL). There was no significant difference of VEGF/VPF concentration in the cyst fluid obtained from thyroid adenoma or from adenomotous goiter with cystic degeneration. Immunoreactive VEGF/VPF in cyst fluid was eluted mainly at 45 kDa, and stimulated endothelial cell proliferation, which was partially blocked by anti-VEGF/VPF antibody. The VEGF/ VPF concentration in the cyst fluid obtained from patients who required repeated aspiration or underwent surgical resection because of recurrent accumulation (84.8 +/- 58.3 ng/mL, mean +/- SD, n = 18) was significantly higher than that in the cysts that regressed or disappeared after a single aspiration (4.3 +/- 4.4 ng/mL, n = 12, P < 0.001). These in vitro and clinical findings suggest that VEGF/VPF is at least partly involved in the accumulation of c...Continue Reading
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