title: Changes in vascular endothelial growth factor, angiopoietins, and Tie-2 levels with G-CSF stimulation in healthy donors.
abstract: The roles of vascular endothelial growth factor (VEGF), Tie-2, and angiopoietins in the mobilization of the hematopoietic stem cells (HSCs) in humans are not yet clearly understood. In order to elucidate mechanisms of HSC mobilization from their niches, we aimed to investigate the effects of mobilization with granulocyte colony-stimulating factor to the levels of VEGF, Tie-2, and angiopoietins 1 and 2 in the allogeneic HSC transplantation donors. Soluble VEGF, Tie-2, angiopoietin 1 and angiopoietin 2 levels were studied in 20 healthy allogeneic HSC transplantation donors before (from peripheral blood) and 5 days after mobilization (from apheresis material). Mean VEGF level in the postmobilization apheresis sample was significantly higher compared to baseline premobilization peripheral blood (t test, p < 0.001). In contrast, mean Tie-2 level in the postmobilization aphaeresis sample was significantly lower compared to baseline premobilization peripheral blood (t test, p = 0.01). Angiopoietin 1 and angiopoietin 2 levels did not differ between baseline and postmobilization samples. A significant rise in VEGF level after mobilization suggests stimulation of the angiogenesis. A significant fall in Tie-2 level suggests suppression of the angiopoietin 1/Tie-2 signaling, leading to release of HSC from the hematopoietic niches and mobilization to the peripheral blood.
authors.affiliation: Adult Hematology-Bone Marrow Transplant Unit, Hacettepe University Medical School, Ankara, Turkey.
authors.forename: Songul
authors.initials: S
authors.lastname: Serefhanoglu
authors.forename: Hakan
authors.initials: H
authors.lastname: Goker
authors.forename: Yahya
authors.initials: Y
authors.lastname: Buyukasik
authors.forename: Mehmet
authors.initials: M
authors.lastname: Turgut
authors.forename: Nilgun
authors.initials: N
authors.lastname: Sayinalp
authors.forename: Ibrahim Celalettin
authors.initials: IC
authors.lastname: Haznedaroglu
authors.forename: Salih
authors.initials: S
authors.lastname: Aksu
authors.forename: Umit
authors.initials: U
authors.lastname: Akman
authors.forename: Osman Ilhami
authors.initials: OI
authors.lastname: Ozcebe
mesh_terms: D042683:Angiopoietin-1 / Q000097:blood; D042702:Angiopoietin-2 / Q000097:blood; D042682:Angiopoietins / Q000097:blood*; D001781:Blood Component Removal; D016179:Granulocyte Colony-Stimulating Factor / Q000008:administration & dosage / Q000494:pharmacology*; D019650:Hematopoietic Stem Cell Mobilization; D006412:Hematopoietic Stem Cells / Q000166:cytology; D006801:Humans; D042787:Receptor, TIE-2 / Q000097:blood*; D055153:Stem Cell Niche; D014019:Tissue Donors; D042461:Vascular Endothelial Growth Factor A / Q000097:blood*
chemical_list: D042683:Angiopoietin-1; D042702:Angiopoietin-2; D042682:Angiopoietins; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; D016179:Granulocyte Colony-Stimulating Factor; D042787:Receptor, TIE-2