Angiogenic properties of adult human thymus fat.
The endogenous proangiogenic properties of adipose tissue are well recognized. Although the adult human thymus has long been known to degenerate into fat tissue, it has never been considered as a potential source of angiogenic factors. We have investigated the expression of diverse angiogenic factors, including vascular endothelial growth factor A and B, angiopoietin 1, and tyrosine-protein kinase receptor-2 (an angiopoietin receptor), and then analyzed their physiological role on endothelial cell migration and proliferation, two relevant events in angiogenesis. The detection of the gene and protein expression of the various proteins has been performed by immunohistochemistry, Western blotting, and quantitative real-time polymerase chain reaction. We show, for the first time, that adult thymus fat produces a variety of angiogenic factors and induces the proliferation and migration of human umbilical cord endothelial cells. Based on these findings, we suggest that this fat has a potential angiogenic function that might affect thymic function and ongoing adipogenesis within the thymus.
Salas
Julián
J
Departamento de Cirugía Cardiovascular, Hospital Regional Universitario Carlos Haya, Avda. Carlos Haya s/n, Málaga, Spain. jsalas@telefonica.net
Montiel
Mercedes
M
Jiménez
Eugenio
E
Valenzuela
Miguel
M
Valderrama
José Francisco
JF
Castillo
Rafael
R
González
Sergio
S
El Bekay
Rajaa
R
D000273:Adipose Tissue / Q000378:metabolism / Q000502:physiology*; D000328:Adult; D042683:Angiopoietin-1 / Q000378:metabolism*; D002465:Cell Movement; D049109:Cell Proliferation; D042783:Endothelial Cells / Q000166:cytology; D006801:Humans; D018919:Neovascularization, Physiologic; D042787:Receptor, TIE-2 / Q000378:metabolism*; D013949:Thymus Extracts; D013950:Thymus Gland / Q000033:anatomy & histology / Q000098:blood supply* / Q000378:metabolism; D014471:Umbilical Veins / Q000166:cytology; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics* / Q000378:metabolism; D042561:Vascular Endothelial Growth Factor B / Q000235:genetics* / Q000378:metabolism
D042683:Angiopoietin-1; D013949:Thymus Extracts; D042461:Vascular Endothelial Growth Factor A; D042561:Vascular Endothelial Growth Factor B; D042787:Receptor, TIE-2