Embryonic lymphangiogenesis.
About 8-9 decades ago the development of embryonic lymphatics was studied intensively. Since then our knowledge has not considerably increased in this field, and it is still unknown whether lymphatics are derived by sprouting from veins, de novo from lymphangioblasts, or by both mechanisms. However, very recent studies have shown that the vascular endothelial growth factor-C (VEGF-C) is a highly specific lymphangiogenic growth factor. This raises new questions and perspectives. Here we will review the literature on embryonic lymphangiogenesis and lymphangiogenic growth factors. We also present a description of the pattern of the lymphatics of avian embryos with emphasis on lymph hearts. The avian embryo is highly suited for studies on lymphatics, because these can be demonstrated by injection methods, serial sectioning and in situ hybridization with VEGF-receptor-2 and -3 probes. The greatest advantage resides in the fact that the lymphatics of the chorioallantoic membrane are easily accessible for experimental studies.
Anatomisches Institut der Albert-Ludwigs Universität Freiburg, Albertstrasse 17, D-79104 Freiburg, Germany. wilting@uni-freiburg.de
J
J
Wilting
H
H
Neeff
B
B
Christ
D000482:Allantois / Q000502:physiology; D000818:Animals; D002823:Chorion / Q000502:physiology; D004627:Embryonic Induction; D016228:Endothelial Growth Factors / Q000502:physiology; D006133:Growth Substances / Q000502:physiology; D006801:Humans; D008208:Lymphatic System / Q000196:embryology*; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics / Q000502:physiology; D017978:Receptors, Growth Factor / Q000235:genetics / Q000502:physiology; D040262:Receptors, Vascular Endothelial Growth Factor; D042582:Vascular Endothelial Growth Factor C
D016228:Endothelial Growth Factors; D006133:Growth Substances; D017978:Receptors, Growth Factor; D042582:Vascular Endothelial Growth Factor C; D020794:Receptor Protein-Tyrosine Kinases; D040262:Receptors, Vascular Endothelial Growth Factor