@article {44, title = {VEGF-C/VEGFR-3 Signaling Regulates Inflammatory Response in Development of Obliterative Airway Disease}, journal = {Journal of Heart and Lung Transplantation}, volume = {30}, year = {2011}, month = {2011//}, pages = {S118 - S118}, author = {Krebs, R and Tikkanen, JM and Ropponen, JO and Jeltsch, M and Jokinen, JJ and Yl{\"a}-Herttuala, S and Koskinen, PK and Nyk{\"a}nen, AI and Lemstr{\"o}m, KB} } @article {43, title = {Vascular endothelial growth factor-B acts as a coronary growth factor in transgenic rats without inducing angiogenesis, vascular leak, or inflammation}, journal = {Circulation}, volume = {122}, year = {2010}, month = {2010/Oct/}, pages = {1725 - 33}, abstract = {BACKGROUND: Vascular endothelial growth factor-B (VEGF-B) binds to VEGF receptor-1 and neuropilin-1 and is abundantly expressed in the heart, skeletal muscle, and brown fat. The biological function of VEGF-B is incompletely understood. METHODS AND RESULTS: Unlike placenta growth factor, which binds to the same receptors, adeno-associated viral delivery of VEGF-B to mouse skeletal or heart muscle induced very little angiogenesis, vascular permeability, or inflammation. As previously reported for the VEGF-B(167) isoform, transgenic mice and rats expressing both isoforms of VEGF-B in the myocardium developed cardiac hypertrophy yet maintained systolic function. Deletion of the VEGF receptor-1 tyrosine kinase domain or the arterial endothelial Bmx tyrosine kinase inhibited hypertrophy, whereas loss of VEGF-B interaction with neuropilin-1 had no effect. Surprisingly, in rats, the heart-specific VEGF-B transgene induced impressive growth of the epicardial coronary vessels and their branches, with large arteries also seen deep inside the subendocardial myocardium. However, VEGF-B, unlike other VEGF family members, did not induce significant capillary angiogenesis, increased permeability, or inflammatory cell recruitment. CONCLUSIONS: VEGF-B appears to be a coronary growth factor in rats but not in mice. The signals for the VEGF-B-induced cardiac hypertrophy are mediated at least in part via the endothelium. Because cardiomyocyte damage in myocardial ischemia begins in the subendocardial myocardium, the VEGF-B-induced increased arterial supply to this area could have therapeutic potential in ischemic heart disease.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/20937974}, author = {Bry, Maija and Kivel{\"a}, Riikka and Holopainen, Tanja and Anisimov, Andrey and Tammela, Tuomas and Soronen, Jarkko and Silvola, Johanna and Saraste, Antti and Jeltsch, Michael and Korpisalo, Petra and Carmeliet, Peter and Lemstr{\"o}m, Karl B and Shibuya, Masabumi and Yl{\"a}-Herttuala, Seppo and Alhonen, Leena and Mervaala, Eero and Andersson, Leif C and Knuuti, Juhani and Alitalo, Kari} } @article {32, title = {Vascular endothelial growth factor (VEGF)/VEGF-C mosaic molecules reveal specificity determinants and feature novel receptor binding patterns}, journal = {J Biol Chem}, volume = {281}, year = {2006}, month = {2006/Apr/}, pages = {12187 - 95}, abstract = {Vascular endothelial growth factors (VEGFs) and their receptors play key roles in angiogenesis and lymphangiogenesis. VEGF activates VEGF receptor-1 (VEGFR-1) and VEGFR-2, whereas VEGF-C activates VEGFR-2 and VEGFR-3. We have created a library of VEGF/VEGF-C mosaic molecules that contains factors with novel receptor binding profiles, notably proteins binding to all three VEGF receptors ("super-VEGFs"). The analyzed super-VEGFs show both angiogenic and lymphangiogenic effects in vivo, although weaker than the parental molecules. The composition of the VEGFR-3 binding molecules and scanning mutagenesis revealed determinants of receptor binding and specificity. VEGFR-2 and VEGFR-3 showed striking differences in their requirements for VEGF-C binding; extracellular domain 2 of VEGFR-2 was sufficient, whereas in VEGFR-3, both domains 1 and 2 were necessary.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/16505489}, author = {Jeltsch, Michael and Karpanen, Terhi and Strandin, Tomas and Aho, Kukka and Lankinen, Hilkka and Alitalo, Kari} } @article {30, title = {Vascular endothelial cell growth factor receptor 3-mediated activation of lymphatic endothelium is crucial for tumor cell entry and spread via lymphatic vessels}, journal = {Cancer Res}, volume = {65}, year = {2005}, month = {2005/Jun/}, pages = {4739 - 46}, abstract = {Lymphangiogenic growth factors vascular endothelial growth factor (VEGF)-C and VEGF-D have been shown to promote lymphatic metastasis by inducing tumor-associated lymphangiogenesis. In this study, we have investigated how tumor cells gain access into lymphatic vessels and at what stage tumor cells initiate metastasis. We show that VEGF-C produced by tumor cells induced extensive lymphatic sprouting towards the tumor cells as well as dilation of the draining lymphatic vessels, suggesting an active role of lymphatic endothelial cells in lymphatic metastasis. A significant increase in lymphatic vessel growth occurred between 2 and 3 weeks after tumor xenotransplantation, and lymph node metastasis occurred at the same stage. These processes were blocked dose-dependently by inhibition of VEGF receptor 3 (VEGFR-3) signaling by systemic delivery of a soluble VEGFR-3-immunoglobulin (Ig) fusion protein via adenoviral or adeno-associated viral vectors. However, VEGFR-3-Ig did not suppress lymph node metastasis when the treatment was started at a later stage after the tumor cells had already spread out, suggesting that tumor cell entry into lymphatic vessels is a key step during tumor dissemination via the lymphatics. Whereas lymphangiogenesis and lymph node metastasis were significantly inhibited by VEGFR-3-Ig, some tumor cells were still detected in the lymph nodes in some of the treated mice. This indicates that complete blockade of lymphatic metastasis may require the targeting of both tumor lymphangiogenesis and tumor cell invasion.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/15930292}, author = {He, Yulong and Rajantie, Iiro and Pajusola, Katri and Jeltsch, Michael and Holopainen, Tanja and Yla-Herttuala, Seppo and Harding, Thomas and Jooss, Karin and Takahashi, Takashi and Alitalo, Kari} } @article {28, title = {Vascular endothelial growth factor C is required for sprouting of the first lymphatic vessels from embryonic veins}, journal = {Nat Immunol}, volume = {5}, year = {2004}, month = {2004/Jan/}, pages = {74 - 80}, abstract = {Lymphatic vessels are essential for immune surveillance, tissue fluid homeostasis and fat absorption. Defects in lymphatic vessel formation or function cause lymphedema. Here we show that the vascular endothelial growth factor C (VEGF-C) is required for the initial steps in lymphatic development. In Vegfc-/- mice, endothelial cells commit to the lymphatic lineage but do not sprout to form lymph vessels. Sprouting was rescued by VEGF-C and VEGF-D but not by VEGF, indicating VEGF receptor 3 specificity. The lack of lymphatic vessels resulted in prenatal death due to fluid accumulation in tissues, and Vegfc+/- mice developed cutaneous lymphatic hypoplasia and lymphedema. Our results indicate that VEGF-C is the paracrine factor essential for lymphangiogenesis, and show that both Vegfc alleles are required for normal lymphatic development.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/14634646}, author = {Karkkainen, Marika J and Haiko, Paula and Sainio, Kirsi and Partanen, Juha and Taipale, Jussi and Petrova, Tatiana V and Jeltsch, Michael and Jackson, David G and Talikka, Marja and Rauvala, Heikki and Betsholtz, Christer and Alitalo, Kari} } @article {26, title = {VEGF guides angiogenic sprouting utilizing endothelial tip cell filopodia}, journal = {J Cell Biol}, volume = {161}, year = {2003}, month = {2003/Jun/}, pages = {1163 - 77}, abstract = {Vascular endothelial growth factor (VEGF-A) is a major regulator of blood vessel formation and function. It controls several processes in endothelial cells, such as proliferation, survival, and migration, but it is not known how these are coordinately regulated to result in more complex morphogenetic events, such as tubular sprouting, fusion, and network formation. We show here that VEGF-A controls angiogenic sprouting in the early postnatal retina by guiding filopodial extension from specialized endothelial cells situated at the tips of the vascular sprouts. The tip cells respond to VEGF-A only by guided migration; the proliferative response to VEGF-A occurs in the sprout stalks. These two cellular responses are both mediated by agonistic activity of VEGF-A on VEGF receptor 2. Whereas tip cell migration depends on a gradient of VEGF-A, proliferation is regulated by its concentration. Thus, vessel patterning during retinal angiogenesis depends on the balance between two different qualities of the extracellular VEGF-A distribution, which regulate distinct cellular responses in defined populations of endothelial cells.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/12810700}, author = {Gerhardt, Holger and Golding, Matthew and Fruttiger, Marcus and Ruhrberg, Christiana and Lundkvist, Andrea and Abramsson, Alexandra and Jeltsch, Michael and Mitchell, Christopher and Alitalo, Kari and Shima, David and Betsholtz, Christer} } @mastersthesis {72, title = {VEGFR-3 Ligands and Lymphangiogenesis}, volume = {PhD Thesis}, year = {2002}, abstract = {Most of us have seen their own blood at one or the other time. The occasion might have been a small accident or in unfortunate cases a severe blood loss caused by a major injury. We also can feel our heart beating and the resulting pressure wave, the pulse. The existence of the car- diovascular system is obvious to us. Unlike the cardiovascular system, the lymphatic system has, until recently, escaped notable attention not only by the laymen, but also by the scientific community. It is unclear why the lymphatic system originally developed in higher vertebrates. Now, its main function seems to be to collect fluid that has leaked from the blood vessels and to return it into the cardiovascular system. Much of our knowledge about the development and structure of the lymphatic system is of considerable age, and it has been said that there has not been any progress in our understanding since the fine structure of the lymphatics was described with the introduction of the electron microscope. Vascular endothelial growth factor (VEGF) is the principal direct inducer of blood vessel growth, but it does not promote the growth of lymphatic vessels. This study demonstrates for the first time specific lymphangiogenesis as a response to the VEGF homologue VEGF-C. Overexpression of full length VEGF-C under the keratin-14 promoter in the skin of transgenic mice caused a proliferation of the lymphatic endothelium and lymphatic vessel enlargement. In the chorioallantoic membrane assay, the mature form of VEGF-C was also largely specific for lymphatic endothelial cells. A newly discovered close homologue of VEGF-C, VEGF-D was then shown to have the same receptor-binding pattern as VEGF-C. Contrary to the interaction of VEGF with its receptors, VEGF-C interaction with VEGFR-3 has not been analyzed at the molecular level. The structural determinants of VEGFR-3 binding were characterized in relation to VEGF using a non-random family shuffling approach with VEGF and VEGF-C as parent molecules. This approach led to the identification of VEGF/VEGF-C mosaic molecules that showed novel receptor binding profiles and a panel of these molecules was used to delineate the requirements of specific receptors in the induction of angiogenesis versus lymphangiogenesis.}, url = {http://ethesis.helsinki.fi/julkaisut/mat/bioti/vk/jeltsch}, author = {Jeltsch, Michael} } @article {23, title = {Vascular endothelial growth factor-C-mediated lymphangiogenesis promotes tumour metastasis}, journal = {EMBO J}, volume = {20}, year = {2001}, month = {2001/Feb/}, pages = {672 - 82}, abstract = {Metastasis 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.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/11179212}, author = {Mandriota, S J and Jussila, L and Jeltsch, M and Compagni, A and Baetens, D and Prevo, R and Banerji, S and Huarte, J and Montesano, R and Jackson, D G and Orci, L and Alitalo, K and Christofori, G and Pepper, M S} } @article {17, title = {Vascular endothelial growth factor B (VEGF-B) binds to VEGF receptor-1 and regulates plasminogen activator activity in endothelial cells}, journal = {Proc Natl Acad Sci U S A}, volume = {95}, year = {1998}, month = {1998/Sep/}, pages = {11709 - 14}, abstract = {The 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.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9751730}, author = {Olofsson, B and Korpelainen, E and Pepper, M S and Mandriota, S J and Aase, K and Kumar, V and Gunji, Y and Jeltsch, M M and Shibuya, M and Alitalo, K and Eriksson, U} } @article {16, title = {Vascular endothelial growth factor D (VEGF-D) is a ligand for the tyrosine kinases VEGF receptor 2 (Flk1) and VEGF receptor 3 (Flt4)}, journal = {Proc Natl Acad Sci U S A}, volume = {95}, year = {1998}, month = {1998/Jan/}, pages = {548 - 53}, abstract = {We have identified a member of the VEGF family by computer-based homology searching and have designated it VEGF-D. VEGF-D is most closely related to VEGF-C by virtue of the presence of N- and C-terminal extensions that are not found in other VEGF family members. In adult human tissues, VEGF-D mRNA is most abundant in heart, lung, skeletal muscle, colon, and small intestine. Analyses of VEGF-D receptor specificity revealed that VEGF-D is a ligand for both VEGF receptors (VEGFRs) VEGFR-2 (Flk1) and VEGFR-3 (Flt4) and can activate these receptors. However. VEGF-D does not bind to VEGFR-1. Expression of a truncated derivative of VEGF-D demonstrated that the receptor-binding capacities reside in the portion of the molecule that is most closely related in primary structure to other VEGF family members and that corresponds to the mature form of VEGF-C. In addition, VEGF-D is a mitogen for endothelial cells. The structural and functional similarities between VEGF-D and VEGF-C define a subfamily of the VEGFs.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9435229}, author = {Achen, M G and Jeltsch, M and Kukk, E and M{\"a}kinen, T and Vitali, A and Wilks, A F and Alitalo, K and Stacker, S A} } @article {15, title = {Vascular 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 activity}, journal = {J Cell Physiol}, volume = {177}, year = {1998}, month = {1998/Dec/}, pages = {439 - 52}, abstract = {Vascular 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.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9808152}, author = {Pepper, M S and Mandriota, S J and Jeltsch, M and Kumar, V and Alitalo, K} } @article {12, title = {Vascular endothelial growth factors VEGF-B and VEGF-C}, journal = {J Cell Physiol}, volume = {173}, year = {1997}, month = {1997/Nov/}, pages = {211 - 5}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9365524}, author = {Joukov, V and Kaipainen, A and Jeltsch, M and Pajusola, K and Olofsson, B and Kumar, V and Eriksson, U and Alitalo, K} } @article {11, title = {VEGF and VEGF-C: specific induction of angiogenesis and lymphangiogenesis in the differentiated avian chorioallantoic membrane}, journal = {Dev Biol}, volume = {188}, year = {1997}, month = {1997/Aug/}, pages = {96 - 109}, abstract = {The lymphangiogenic potency of endothelial growth factors has not been studied to date. This is partially due to the lack of in vivo lymphangiogenesis assays. We have studied the lymphatics of differentiated avian chorioallantoic membrane (CAM) using microinjection of Mercox resin, semi- and ultrathin sectioning, immunohistochemical detection of fibronectin and alpha-smooth muscle actin, and in situ hybridization with VEGFR-2 and VEGFR-3 probes. CAM is drained by lymphatic vessels which are arranged in a regular pattern. Arterioles and arteries are accompanied by a pair of interconnected lymphatics and form a plexus around bigger arteries. Veins are also associated with lymphatics, particularly larger veins, which are surrounded by a lymphatic plexus. The lymphatics are characterized by an extremely thin endothelial lining, pores, and the absence of a basal lamina. Patches of the extracellular matrix can be stained with an antibody against fibronectin. Lymphatic endothelial cells of differentiated CAM show ultrastructural features of this cell type. CAM lymphatics do not possess mediae. In contrast, the lymphatic trunks of the umbilical stalk are invested by a single but discontinuous layer of smooth muscle cells. CAM lymphatics express VEGFR-2 and VEGFR-3. Both the regular pattern and the typical structure of these lymphatics suggest that CAM is a suitable site to study the in vivo effects of potential lymphangiogenic factors. We have studied the effects of VEGF homo- and heterodimers, VEGF/PlGF heterodimers, and PlGF and VEGF-C homodimers on Day 13 CAM. All the growth factors containing at least one VEGF chain are angiogenic but do not induce lymphangiogenesis. PlGF-1 and PlGF-2 are neither angiogenic nor lymphangiogenic. VEGF-C is the first lymphangiogenic factor and seems to be highly chemoattractive for lymphatic endothelial cells. It induces proliferation of lymphatic endothelial cells and development of new lymphatic sinuses which are directed immediately beneath the chorionic epithelium. Our studies show that VEGF and VEGF-C are specific angiogenic and lymphangiogenic growth factors, respectively.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9245515}, author = {Oh, S J and Jeltsch, M M and Birkenh{\"a}ger, R and McCarthy, J E and Weich, H A and Christ, B and Alitalo, K and Wilting, J} } @article {9, title = {VEGF-C receptor binding and pattern of expression with VEGFR-3 suggests a role in lymphatic vascular development}, journal = {Development}, volume = {122}, year = {1996}, month = {1996/Dec/}, pages = {3829 - 37}, abstract = {The vascular endothelial growth factor family has recently been expanded by the isolation of two new VEGF-related factors, VEGF-B and VEGF-C. The physiological functions of these factors are largely unknown. Here we report the cloning and characterization of mouse VEGF-C, which is produced as a disulfide-linked dimer of 415 amino acid residue polypeptides, sharing an 85\% identity with the human VEGF-C amino acid sequence. The recombinant mouse VEGF-C protein was secreted from transfected cells as VEGFR-3 (Flt4) binding polypeptides of 30-32x10(3) Mr and 22-23x10(3) Mr which preferentially stimulated the autophosphorylation of VEGFR-3 in comparison with VEGFR-2 (KDR). In in situ hybridization, mouse VEGF-C mRNA expression was detected in mesenchymal cells of postimplantation mouse embryos, particularly in the regions where the lymphatic vessels undergo sprouting from embryonic veins, such as the perimetanephric, axillary and jugular regions. In addition, the developing mesenterium, which is rich in lymphatic vessels, showed strong VEGF-C expression. VEGF-C was also highly expressed in adult mouse lung, heart and kidney, where VEGFR-3 was also prominent. The pattern of expression of VEGF-C in relation to its major receptor VEGFR-3 during the sprouting of the lymphatic endothelium in embryos suggests a paracrine mode of action and that one of the functions of VEGF-C may be in the regulation of angiogenesis of the lymphatic vasculature.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9012504}, author = {Kukk, E and Lymboussaki, A and Taira, S and Kaipainen, A and Jeltsch, M and Joukov, V and Alitalo, K} }