The roles of angiogenesis in development, health, and disease have been studied extensively; however, the studies related to lymphatic system are limited due to the difficulty in observing colorless lymphatic vessels. But recently, with the improved technique, the relative importance of the lymphatic system is just being revealed. We bred transgenic mice in which lymphatic endothelial cells express GFP (Prox1-GFP) with mice in which vascular endothelial cells express DsRed (Flt1-DsRed) to generate Prox1-GFP/Flt1-DsRed (PGFD) mice. The inherent fluorescence of blood and lymphatic vessels allows for direct visualization of blood and lymphatic vessels in various organs via confocal and two-photon microscopy and the formation, branching, and regression of both vessel types in the same live mouse cornea throughout an experimental time course. PGFD mice were bred with CDh5CreERT2 and VEGFR2lox knockout mice to examine specific knockouts. These studies showed a novel role for vascular endothelial cell VEGFR2 in regulating VEGFC-induced corneal lymphangiogenesis. Conditional deletion of vascular endothelial VEGFR2 abolished VEGFA- and VEGFC-induced corneal lymphangiogenesis. These results demonstrate the potential use of the PGFD mouse as a powerful animal model for studying angiogenesis and lymphangiogenesis.
[1]Univ Illinois, Dept Ophthalmol & Visual Sci, Coll Med, Illinois Eye & Ear Infirm, Chicago, IL 60612 USA.
[2]Jilin Univ, China Japan Union Hosp, Dept Ophthalmol, Changchun 130033, Jilin, Peoples R China.
[3]Jilin Univ, Sch Life Sci, Changchun, Jilin, Peoples R China.
[4]Shiga Univ Med Sci, Dept Stem Cells & Human Dis Models, Tsukinowa Cho, Otsu, Shiga, Japan.
[5]Univ Munster, Dept Tissue Morphogenesis, Fac Med, Max Planck Inst Mol Biomed, D-48149 Munster, Germany.
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