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Prolonged E‐selectin induction by monocytes potentiates the adhesion of flowing neutrophils to cultured endothelial cells
Author(s) -
Rainger G. E.,
Wautier MariePaule,
Nash Gerard,
Wautier JeanLuc
Publication year - 1996
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1046/j.1365-2141.1996.00308.x
Subject(s) - cd18 , monocyte , umbilical vein , e selectin , endothelial stem cell , adhesion , tumor necrosis factor alpha , selectin , immunology , cell adhesion , microbiology and biotechnology , interleukin 8 , chemistry , cell adhesion molecule , endothelium , inflammation , antibody , biology , in vitro , endocrinology , biochemistry , monoclonal antibody , organic chemistry
We investigated the hypothesis that the infiltration of monocytes into inflamed tissue or damaged vessels would induce a secondary accumulation of neutrophils. Confluent human umbilical vein endothelial cells (HUVEC) and blood monocytes (0.5 or 0.05 monocytes/endothelial cell) were co‐incubated for 4 or 24 h. The adhesion of neutrophils flowing over HUVEC was then analysed by video microscopy. Co‐incubation caused up to a 40‐fold increase in neutrophil adhesion, dependent upon monocyte/HUVEC ratio and duration of incubation. At the lower monocyte/HUVEC ratio, rolling adhesion alone was induced after 4 h co‐incubation; however, the full repertoire of rolling, immobilization and migration of neutrophils was observed at all other combinations of co‐culture ratio and exposure time. After maximal stimulation by monocytes, antibody blockade of the neutrophil integrin CD18 inhibited neutrophil arrest and migration and revealed underlying rolling adhesion. Rolling was supported by endothelial E‐selectin as demonstrated by the almost total abolition of adhesion by a blocking antibody. In a direct comparison, monocytes, tumour necrosis factor α (TNF‐α) and interleukin‐1β (IL‐1β) were assessed for their ability to induce endothelial expression of E‐selectin. E selectin was significantly increased by all agents at 4 h, but monocytes alone were able to maintain high levels of E‐selectin expression for 24 h. We conclude that monocytes can induce prolonged neutrophil adhesion and migration by activating endothelial cells and causing expression of E‐selectin.