Characterization of the response of human bone marrow endothelial cells to in vitro irradiation.
Endothelial cell dysfunction is a classic consequence of radiation damage. Bone marrow endothelial cells (BMEC) are a critical component of the stroma in the regulation of haemopoiesis. In animal models, radiation-induced injury of BMEC has been described and a role for BMEC in haemopoietic regeneration after irradiation has been suggested. However, functions of BMEC involved in the haemopoietic regeneration have not been assessed. Therefore we studied the functional response of human BMEC to irradiation using the transformed human BMEC line (TrHBMEC) irradiated with 2. 5 or 10Gy. Our results showed a time- and a dose-dependent increase in damage to irradiated TrHBMEC measured by a decreased number of adherent cells which correlated with increased apoptosis and augmented release of soluble ICAM-1 and von Willebrand factor. 2 Gy irradiated TrHBMEC expressed more ICAM-1 on their surface than non-irradiated cells, whereas no change in VCAM-1, E-selectin and PECAM-1 expression was observed. An increased production of G-CSF, GM-CSF, IL-8, IL-6, IL-1alpha, IL-11, MIP-1alpha and SCF and no production of LIF, TNF-alpha, TPO and IL-3 by 2 Gy irradiated TrHBMEC was observed. The haemopoietic supportive function of TrHBMEC was not altered after a 2 Gy exposure. These results suggest that although radiation induces endothelial cell damage, irradiated cells still support the proliferation and the differentiation of CD34+ haemopoietic cells.
Gaugler
M H
MH
Institut de Protection et de Sûreté Nucléaire, Département de Protection de la Santé de l'Homme et de Dosimétrie, IPSN, Fontenay-aux-Roses, France.
Squiban
C
C
Claraz
M
M
Schweitzer
K
K
Weksler
B
B
Gourmelon
P
P
Van der Meeren
A
A
D017209:Apoptosis / Q000528:radiation effects; D001854:Bone Marrow Cells / Q000378:metabolism / Q000528:radiation effects*; D002454:Cell Differentiation; D002455:Cell Division; D002461:Cell Line, Transformed; D016207:Cytokines / Q000378:metabolism; D004307:Dose-Response Relationship, Radiation; D019040:E-Selectin / Q000378:metabolism; D004847:Epithelial Cells / Q000378:metabolism / Q000528:radiation effects*; D005720:Gamma Rays; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D019010:Vascular Cell Adhesion Molecule-1 / Q000378:metabolism; D014841:von Willebrand Factor / Q000378:metabolism
D016207:Cytokines; D019040:E-Selectin; D019010:Vascular Cell Adhesion Molecule-1; D014841:von Willebrand Factor; D018799:Intercellular Adhesion Molecule-1