02307nas a2200241   4500008004100000245010400041210006900145260001400214300001400228490000700242520156400249100002001813700001801833700002301851700002001874700001801894700001901912700002101931700002101952700002501973700001801998856004902016       2003                        eng d00aIntrinsic versus microenvironmental regulation of lymphatic endothelial cell phenotype and function0 aIntrinsic versus microenvironmental regulation of lymphatic endo  c2003/Nov/  a2006 - 130 v173 aVascular endothelial cells are characterized by a high degree of functional and phenotypic plasticity, which is controlled both by their pericellular microenvironment and their intracellular gene expression programs. To gain further insight into the mechanisms regulating the endothelial cell phenotype, we have compared the responses of lymphatic endothelial cells (LECs) and blood vascular endothelial cells (BECs) to vascular endothelial growth factors (VEGFs). VEGFR-3-specific signals are sufficient for LEC but not BEC proliferation, as shown by the ability of the specific ligand VEGF-C156S to stimulate cell cycle entry only in LECs. On the other hand, we found that VEGFR-3 stimulation did not induce LEC cell shape changes typical of VEGFR-2-stimulated LECs, indicating receptor-specific differences in the cytoskeletal responses. Genes induced via VEGFR-2 also differed between BECs and LECs: angiopoietin-2 (Ang-2) was induced via VEGFR-2 in BECs and LECs, but the smooth muscle cell (SMC) chemoattractant BMP-2 was induced only in BECs. Both BECs and LECs were able to promote SMC chemotaxis, but contact with SMCs led to down-regulation of VEGFR-3 expression in BECs in a 3-dimensional coculture system. This was consistent with the finding that VEGFR-3 is down-regulated in vivo at sites of endothelial cell-pericyte/smooth muscle cell contacts. Collectively, these data show intrinsic cell-specific differences of BEC and LEC responses to VEGFs and identify a pericellular regulatory mechanism for VEGFR-3 down-regulation in endothelial cells.1 aVeikkola, Tanja1 aLohela, Marja1 aIkenberg, Kristian1 aMäkinen, Taija1 aKorff, Thomas1 aSaaristo, Anne1 aPetrova, Tatania1 aJeltsch, Michael1 aAugustin, Hellmut, G1 aAlitalo, Kari  uhttp://view.ncbi.nlm.nih.gov/pubmed/1459767002694nas a2200313   4500008004100000245011900041210006900160260001400229300001300243490000800256520179900264100001802063700001602081700001702097700001502114700001902129700001802148700001702166700001302183700001502196700001902211700001502230700001402245700001802259700001702277700001502294700002202309856004902331       2000                        eng d00aIntravascular adenovirus-mediated VEGF-C gene transfer reduces neointima formation in balloon-denuded rabbit aorta0 aIntravascular adenovirusmediated VEGFC gene transfer reduces neo  c2000/Oct/  a2262 - 80 v1023 aBACKGROUND: Gene transfer to the vessel wall may provide new possibilities for the treatment of vascular disorders, such as postangioplasty restenosis. In this study, we analyzed the effects of adenovirus-mediated vascular endothelial growth factor (VEGF)-C gene transfer on neointima formation after endothelial denudation in rabbits. For comparison, a second group was treated with VEGF-A adenovirus and a third group with lacZ adenovirus. Clinical-grade adenoviruses were used for the study. METHODS AND RESULTS: Aortas of cholesterol-fed New Zealand White rabbits were balloon-denuded, and gene transfer was performed 3 days later. Animals were euthanized 2 and 4 weeks after the gene transfer, and intima/media ratio (I/M), histology, and cell proliferation were analyzed. Two weeks after the gene transfer, I/M in the lacZ-transfected control group was 0. 57+/-0.04. VEGF-C gene transfer reduced I/M to 0.38+/-0.02 (P:<0.05 versus lacZ group). I/M in VEGF-A-treated animals was 0.49+/-0.17 (P:=NS). The tendency that both VEGF groups had smaller I/M persisted at the 4-week time point, when the lacZ group had an I/M of 0.73+/-0.16, the VEGF-C group 0.44+/-0.14, and the VEGF-A group 0. 63+/-0.21 (P:=NS). Expression of VEGF receptors 1, 2, and 3 was detected in the vessel wall by immunocytochemistry and in situ hybridization. As an additional control, the effect of adenovirus on cell proliferation was analyzed by performing gene transfer to intact aorta without endothelial denudation. No differences were seen in smooth muscle cell proliferation or I/M between lacZ adenovirus and 0.9% saline-treated animals. CONCLUSIONS: Adenovirus-mediated VEGF-C gene transfer may be useful for the treatment of postangioplasty restenosis and vessel wall thickening after vascular manipulations.1 aHiltunen, M O1 aLaitinen, M1 aTurunen, M P1 aJeltsch, M1 aHartikainen, J1 aRissanen, T T1 aLaukkanen, J1 aNiemi, M1 aKossila, M1 aHäkkinen, T P1 aKivelä, A1 aEnholm, B1 aMansukoski, H1 aTurunen, A M1 aAlitalo, K1 aYlä-Herttuala, S  uhttp://view.ncbi.nlm.nih.gov/pubmed/11056103