VEGF-promoted surgical angiogenesis in necrotic bone.
The ability of vascular endothelial growth factor (VEGF) to accelerate neoangiogenesis from implanted arterovenous (AV) bundles in necrotic bone was evaluated. A saphenous AV bundle was placed in a necrotic segment of rabbit ilium. In group II, VEGF (100 ng/h x 3 days) was administered by continuous infusion. Bone blood flow was measured with radioactive-labeled microspheres, and capillary density was determined by microangiography combined with Spälteholtz bone clearing at 1, 2, and 4 weeks. Neovascularization was observed along the implanted vascular bundle in both groups. One week after surgery, bone blood flow and vessel area were significantly higher in VEGF-treated animals (P < 0.05). No significant difference was observed at later times. Direct VEGF administration increased surgical angiogenesis and improved blood flow and neovascularization in necrotic bone 1 week after AV bundle implantation. Thereafter, a robust angiogenic response from the AV bundle was seen in both groups.
Suzuki
Osami
O
Department of Orthopedic Surgery, Microvascular Research Laboratory, Mayo Clinic, Rochester, MN, USA.
Bishop
Allen T
AT
Sunagawa
Toru
T
Katsube
Kosuke
K
Friedrich
Patricia F
PF
D000818:Animals; D001808:Blood Vessels / Q000637:transplantation*; D016025:Bone Transplantation; D008863:Microspheres; D018919:Neovascularization, Physiologic; D010020:Osteonecrosis / Q000601:surgery* / Q000628:therapy*; D011817:Rabbits; D012501:Saphenous Vein / Q000637:transplantation; D042461:Vascular Endothelial Growth Factor A / Q000627:therapeutic use*
D042461:Vascular Endothelial Growth Factor A