Angiogenic responses of vascular endothelial growth factors in periadventitial tissue.
Recent discovery of new members of the vascular endothelial growth factor (VEGF) family has generated much interest as to which members may be best suited for therapeutic angiogenesis in various tissues. In this study we evaluated angiogenic responses of the different members of the VEGF family in vivo using adenoviral gene transfer. Adenoviruses (1 x 10(9) plaque-forming units [pfu]) encoding for VEGF-A, VEGF-B, VEGF-C, VEGF-D, VEGF-C(deltaNdeltaC) and VEGF-D(deltaNdeltaC) (deltaNdeltaC are proteolytically cleaved forms) were transferred locally to the periadventitial space of the rabbit carotid arteries using a collar technique that allows efficient local transfection of the periadventitial tissue. Expression of the transfected VEGFs was confirmed by immunohistochemistry and reverse transcription-polymerase chain reaction (RT-PCR). Seven days after the gene transfer maximum neovessel formation was observed in VEGF-A-, VEGF-D-, and VEGF-D(deltaNdeltaC)-transfected arteries. VEGF-C(deltaNdeltaC) also showed angiogenic activity whereas VEGF-B was not effective in inducing angiogenesis. Pericytes were detected around the neovessels, which also frequently showed the presence of intraluminal erythrocytes. Infiltration of inflammatory cells in response to VEGF-D and VEGF-D(deltaNdeltaC) was less prominent than that caused by other VEGFs. In line with the absence of lymphatics in the normal carotid arteries no significant evidence of lymphatic vessel formation was seen in response to any of the studied VEGFs in the periadventitial space. The results help to define possibilities for local angiogenic therapy around blood vessels and support the concept that angiogenic effects may be tissue-specific and depend both on the growth factor ligands and the target tissues. It is concluded that VEGF-A, VEGF-D, and VEGF-D(deltaNdeltaC) are the best candidates for therapeutic angiogenesis when delivered around large arteries.
Department of Biotechnology and Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Kuopio, 70211 Kuopio, Finland.
Shalini
S
Bhardwaj
Himadri
H
Roy
Marcin
M
Gruchala
Helena
H
Viita
Ivana
I
Kholova
Ilze
I
Kokina
Marc G
MG
Achen
Steven A
SA
Stacker
Marja
M
Hedman
Kari
K
Alitalo
Seppo
S
Ylä-Herttuala
D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D002196:Capillaries / Q000473:pathology; D002339:Carotid Arteries / Q000378:metabolism; D002455:Cell Division; D004912:Erythrocytes / Q000378:metabolism; D018014:Gene Transfer Techniques; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007150:Immunohistochemistry; D008024:Ligands; D008214:Lymphocytes / Q000166:cytology; D008264:Macrophages / Q000378:metabolism; D008856:Microscopy, Fluorescence; D009389:Neovascularization, Pathologic; D011401:Promoter Regions, Genetic; D011817:Rabbits; D040262:Receptors, Vascular Endothelial Growth Factor / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors; D014162:Transfection; D019076:Transgenes; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism*; D042561:Vascular Endothelial Growth Factor B / Q000378:metabolism; D042582:Vascular Endothelial Growth Factor C / Q000378:metabolism; D042643:Vascular Endothelial Growth Factor D / Q000378:metabolism
D008024:Ligands; D042461:Vascular Endothelial Growth Factor A; D042561:Vascular Endothelial Growth Factor B; D042582:Vascular Endothelial Growth Factor C; D042643:Vascular Endothelial Growth Factor D; D040262:Receptors, Vascular Endothelial Growth Factor