Role of c-Fyn in FGF-2-mediated tube-like structure formation by murine brain capillary endothelial cells.
Tube formation of endothelial cells is an important step of angiogenesis. However, little is known about the molecular mechanisms underlying growth factor-mediated tube formation by endothelial cells. FGF-2 stimulates tube formation by a murine brain capillary endothelial cell line, IBE cells, when cultured on collagen gels (differentiation-associated culture condition), whereas cells proliferate and migrate without forming tube on fibronectin-coated surface (proliferation/migration-associated condition). To elucidate FGF-2-mediated signal transduction pathways leading to tube formation by endothelial cells, we focused on the contribution of Src family kinases. Src family kinase inhibitor PP2 attenuated FGF-2-induced tube formation. Stable expression of kinase-inactive c-Src in IBE cells demonstrated no dominant negative effect on FGF-2-induced tube formation. In vitro kinase assay revealed that c-Fyn was activated by FGF-2 only in cells cultured on collagen gels. Three independent cell lines, expressing kinase-inactive c-Fyn, all exhibited attenuation of FGF-2-mediated tube formation. However, FGF-2-mediated proliferation or migration was not clearly perturbed in these cells. These results show the first time that c-Fyn plays a pivotal role in tube formation by endothelial cells.
Tsuda
Satoshi
S
Department of Urology, Nagasaki University School of Medicine, 1-7-1, Sakamoto, Nagasaki, 852-8501, Japan.
Ohtsuru
Akira
A
Yamashita
Shunichi
S
Kanetake
Hiroshi
H
Kanda
Shigeru
S
D000818:Animals; D000077214:Becaplermin; D001921:Brain / Q000098:blood supply*; D002196:Capillaries / Q000254:growth & development; D002460:Cell Line; D004730:Endothelium, Vascular / Q000254:growth & development*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D016222:Fibroblast Growth Factor 2 / Q000502:physiology*; D051379:Mice; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000502:physiology*; D051076:Proto-Oncogene Proteins c-fyn; D020574:Proto-Oncogene Proteins c-sis; D011743:Pyrimidines / Q000494:pharmacology; D015398:Signal Transduction; D019061:src-Family Kinases / Q000037:antagonists & inhibitors
C412373:AG 1879; D004791:Enzyme Inhibitors; D010982:Platelet-Derived Growth Factor; D011518:Proto-Oncogene Proteins; D020574:Proto-Oncogene Proteins c-sis; D011743:Pyrimidines; D016222:Fibroblast Growth Factor 2; D000077214:Becaplermin; C494960:Fyn protein, mouse; D051076:Proto-Oncogene Proteins c-fyn; D019061:src-Family Kinases