Prolonged culture of endothelial cells and deposition of basement membrane modify the recruitment of neutrophils.
We tested whether endothelial cell conditioning during prolonged culture and deposition of basement membrane (BM) could modify neutrophil recruitment induced by the inflammatory cytokine, tumour necrosis factor-alpha (TNF). Confluent endothelial cells (EC) from human umbilical veins were cultured for 1 to 20 days and then stimulated with 1, 10 or 100 U/ml of TNF for 4 h. When isolated neutrophils were settled on EC stimulated with the lower doses of TNF, the levels of adhesion and the proportion of adherent cells that transmigrated increased markedly with time of culture. At 100 U/ml TNF, time of culture had little effect on recruitment, but the transmigrated neutrophils moved more slowly under the monolayer in longer-term cultures. The inhibitory effects of function-blocking antibodies against E-selectin and beta2-integrin, and studies in which neutrophils were perfused over short- or long-term cultures, suggested that increased adhesion and migration arose from increased efficiency of neutrophil activation by the EC. Prolonged culture was also associated with deposition of a distinct BM. When fresh EC were seeded on day 20 BM, transmigrated neutrophils moved more slowly under the EC than under control monolayers. Thus, EC change their pro-inflammatory phenotype during prolonged culture, and the deposited basement membrane influences neutrophil migration.
Butler
Lynn M
LM
Centre for Cardiovascular Sciences and MRC Centre for Immune Regulation, The Medical School, The University of Birmingham, Birmingham B15 2TT, UK.
Rainger
G Ed
GE
Rahman
Mahbub
M
Nash
Gerard B
GB
D001485:Basement Membrane / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D002478:Cells, Cultured; D018920:Coculture Techniques; D042783:Endothelial Cells / Q000166:cytology* / Q000378:metabolism; D006801:Humans; D020556:Neutrophil Infiltration / Q000502:physiology*; D009504:Neutrophils / Q000166:cytology* / Q000276:immunology / Q000502:physiology*; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
D014409:Tumor Necrosis Factor-alpha