02021nas a2200289   4500008004100000245009500041210006900136260001400205300001300219490000700232520122500239100001901464700001501483700001501498700001601513700001501529700001301544700001501557700001401572700001701586700001701603700001201620700001501632700001901647700001601666856004901682       2001                        eng d00aVascular endothelial growth factor-C-mediated lymphangiogenesis promotes tumour metastasis0 aVascular endothelial growth factorCmediated lymphangiogenesis pr  c2001/Feb/  a672 - 820 v203 aMetastasis is a frequent and lethal complication of cancer. Vascular endothelial growth factor-C (VEGF-C) is a recently described lymphangiogenic factor. Increased expression of VEGF-C in primary tumours correlates with dissemination of tumour cells to regional lymph nodes. However, a direct role for VEGF-C in tumour lymphangiogenesis and subsequent metastasis has yet to be demonstrated. Here we report the establishment of transgenic mice in which VEGF-C expression, driven by the rat insulin promoter (Rip), is targeted to beta-cells of the endocrine pancreas. In contrast to wild-type mice, which lack peri-insular lymphatics, RipVEGF-C transgenics develop an extensive network of lymphatics around the islets of Langerhans. These mice were crossed with Rip1Tag2 mice, which develop pancreatic beta-cell tumours that are neither lymphangiogenic nor metastatic. Double-transgenic mice formed tumours surrounded by well developed lymphatics, which frequently contained tumour cell masses of beta-cell origin. These mice frequently developed pancreatic lymph node metastases. Our findings demonstrate that VEGF-C-induced lymphangiogenesis mediates tumour cell dissemination and the formation of lymph node metastases.1 aMandriota, S J1 aJussila, L1 aJeltsch, M1 aCompagni, A1 aBaetens, D1 aPrevo, R1 aBanerji, S1 aHuarte, J1 aMontesano, R1 aJackson, D G1 aOrci, L1 aAlitalo, K1 aChristofori, G1 aPepper, M S  uhttp://view.ncbi.nlm.nih.gov/pubmed/1117921201922nas a2200253   4500008004100000245014100041210006900182260001400251300001500265490000700280520116200287100001601449700001901465700001601484700001901500700001201519700001301531700001301544700001701557700001501574700001501589700001601604856004801620       1998                        eng d00aVascular endothelial growth factor B (VEGF-B) binds to VEGF receptor-1 and regulates plasminogen activator activity in endothelial cells0 aVascular endothelial growth factor B VEGFB binds to VEGF recepto  c1998/Sep/  a11709 - 140 v953 aThe vascular endothelial growth factor (VEGF) family has recently expanded by the identification and cloning of three additional members, namely VEGF-B, VEGF-C, and VEGF-D. In this study we demonstrate that VEGF-B binds selectively to VEGF receptor-1/Flt-1. This binding can be blocked by excess VEGF, indicating that the interaction sites on the receptor are at least partially overlapping. Mutating the putative VEGF receptor-1/Flt-1 binding determinants Asp63, Asp64, and Glu67 to alanine residues in VEGF-B reduced the affinity to VEGF receptor-1 but did not abolish binding. Mutational analysis of conserved cysteines contributing to VEGF-B dimer formation suggest a structural conservation with VEGF and platelet-derived growth factor. Proteolytic processing of the 60-kDa VEGF-B186 dimer results in a 34-kDa dimer containing the receptor-binding epitopes. The binding of VEGF-B to its receptor on endothelial cells leads to increased expression and activity of urokinase type plasminogen activator and plasminogen activator inhibitor 1, suggesting a role for VEGF-B in the regulation of extracellular matrix degradation, cell adhesion, and migration.1 aOlofsson, B1 aKorpelainen, E1 aPepper, M S1 aMandriota, S J1 aAase, K1 aKumar, V1 aGunji, Y1 aJeltsch, M M1 aShibuya, M1 aAlitalo, K1 aEriksson, U  uhttp://view.ncbi.nlm.nih.gov/pubmed/975173002306nas a2200181   4500008004100000245020900041210006900250260001400319300001300333490000800346520164400354100001601998700001902014700001502033700001302048700001502061856004802076       1998                        eng d00aVascular endothelial growth factor (VEGF)-C synergizes with basic fibroblast growth factor and VEGF in the induction of angiogenesis in vitro and alters endothelial cell extracellular proteolytic activity0 aVascular endothelial growth factor VEGFC synergizes with basic f  c1998/Dec/  a439 - 520 v1773 aVascular endothelial growth factor-C (VEGF-C) is a recently characterized member of the VEGF family of angiogenic polypeptides. We demonstrate here that VEGF-C is angiogenic in vitro when added to bovine aortic or lymphatic endothelial (BAE and BLE) cells but has little or no effect on bovine microvascular endothelial (BME) cells. As reported previously for VEGF, VEGF-C and basic fibroblast growth factor (bFGF) induced a synergistic in vitro angiogenic response in all three cells lines. Unexpectedly, VEGF and VEGF-C also synergized in the in vitro angiogenic response when assessed on BAE cells. Characterization of VEGF receptor (VEGFR) expression revealed that BME, BAE, and BLE cell lines express VEGFR-1 and -2, whereas of the three cell lines assessed, only BAE cells express VEGFR-3. We also demonstrate that VEGF-C increases plasminogen activator (PA) activity in the three bovine endothelial cell lines and that this is accompanied by a concomitant increase in PA inhibitor-1. Addition of alpha2-antiplasmin to BME cells co-treated with bFGF and VEGF-C partially inhibited collagen gel invasion. These results demonstrate, first, that by acting in concert with bFGF or VEGF, VEGF-C has a potent synergistic effect on the induction of angiogenesis in vitro and, second, that like VEGF and bFGF, VEGF-C is capable of altering endothelial cell extracellular proteolytic activity. These observations also highlight the notion of context, i.e., that the activity of an angiogenesis-regulating cytokine depends on the presence and concentration of other cytokines in the pericellular environment of the responding endothelial cell.1 aPepper, M S1 aMandriota, S J1 aJeltsch, M1 aKumar, V1 aAlitalo, K  uhttp://view.ncbi.nlm.nih.gov/pubmed/9808152